CN106735195A - The degreasing sintered tools of MIM and degreasing sintered technique - Google Patents
The degreasing sintered tools of MIM and degreasing sintered technique Download PDFInfo
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- CN106735195A CN106735195A CN201710190847.4A CN201710190847A CN106735195A CN 106735195 A CN106735195 A CN 106735195A CN 201710190847 A CN201710190847 A CN 201710190847A CN 106735195 A CN106735195 A CN 106735195A
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- sintered
- product
- degreasing
- sintering
- jig body
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- 238000005238 degreasing Methods 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005245 sintering Methods 0.000 claims abstract description 100
- 238000006555 catalytic reaction Methods 0.000 claims abstract description 21
- 238000011010 flushing procedure Methods 0.000 claims abstract description 14
- 239000002253 acid Substances 0.000 claims abstract description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 40
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 30
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 30
- 229910017604 nitric acid Inorganic materials 0.000 claims description 30
- 238000001816 cooling Methods 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 20
- 229910052757 nitrogen Inorganic materials 0.000 claims description 20
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 15
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 10
- 238000010792 warming Methods 0.000 claims description 10
- 230000001464 adherent effect Effects 0.000 claims description 7
- 239000001569 carbon dioxide Substances 0.000 claims description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 5
- 239000003054 catalyst Substances 0.000 claims description 5
- 230000003197 catalytic effect Effects 0.000 claims description 5
- 150000004965 peroxy acids Chemical class 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 5
- 229920003023 plastic Polymers 0.000 claims description 5
- 229920006324 polyoxymethylene Polymers 0.000 claims description 5
- 239000002912 waste gas Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229910002114 biscuit porcelain Inorganic materials 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical group O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- IXSZQYVWNJNRAL-UHFFFAOYSA-N etoxazole Chemical compound CCOC1=CC(C(C)(C)C)=CC=C1C1N=C(C=2C(=CC=CC=2F)F)OC1 IXSZQYVWNJNRAL-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000003739 neck Anatomy 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
- B22F3/1025—Removal of binder or filler not by heating only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F2003/1042—Sintering only with support for articles to be sintered
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses the degreasing sintered tools of MIM and degreasing sintered technique, the degreasing sintered tools of MIM include：Jig body, jig body is placed in the lower section of product to be sintered, one is formed with jig body for treating the support sector that sintered products are supported, jig body is coordinated by support sector with product to be sintered, the first gap is reserved with both cooperations and realizes that product shrinks, at the side of jig body two and product cooperation to be sintered there is the second gap to realize empty avoiding；Sintering process includes following operation：Degreasing goods of furniture for display rather than for use, acid degreasing, sintering goods of furniture for display rather than for use, sintering and sintering terminate, wherein acid degreasing includes preceding flushing, catalysis and rinses afterwards, sintering includes high temperature degreasing, vacuum-sintering, partial pressure is sintered, stove is cold and forces to cool down.Through the above way, the present invention can realize the production of big product, cavity class product and complex structure product, and product strength is guaranteed, will not crack and cave in, is unlikely to deform, and high yield rate greatly improves the market competitiveness.
Description
Technical field
The present invention relates to the degreasing sintered technical fields of MIM, more particularly to a kind of degreasing sintered tools of MIM and degreasing sintered
Technique.
Background technology
With continuing to develop for MIM industries, many big product, cavity class product and baroque products are applied to
MIM industries, requirement to MIM also more and more higher, the degreasing of product and sintering are also more and more difficult.
In degreasing and sintering process, binding agent and additive in material can be with de- for the big product of cavity class and complexity
The process of fat and sintering is slowly disposed, and the intensity of product can slowly die down, and cavity and baroque product can produce change
Crackle and cave in, in pullling with the influence of product self gravitation for sintering shrinkage power, product can be deformed, and not have always at present
There are suitable support tool and sintering process just to overcome above mentioned problem.
For such industry phenomenon degreasing, sintering are carried out, it is necessary to design corresponding tool and do support.I takes charge of independent studies
Have developed with the degreasing, sintering tool and degreasing, sintering process for improving degreasing, sintering quality and be applied to complex product,
In the market without ripe available such sintering tool and sintering process.
The content of the invention
The present invention solves the technical problem of a kind of degreasing sintered tools of MIM and degreasing sintered technique is provided, can
The production of big product, cavity class product and complex structure product is realized, the intensity of product is guaranteed, and will not crack and collapse
Collapse, be unlikely to deform, high yield rate substantially increases the market competitiveness.
In order to solve the above technical problems, one aspect of the present invention is：There is provided that a kind of MIM is degreasing sintered to be controlled
Tool, it is characterised in that including：Jig body, jig body is placed in the lower section of product to be sintered,
It is formed with a support sector in jig body to be supported for treating sintered products, jig body passes through support sector and treats
Sintered products are coordinated, be reserved with both cooperations the first gap realize product shrink, two sides of jig body with treat
There is the second gap to realize empty avoiding at the cooperation of sintered products.
In a preferred embodiment of the present invention, the top ends of the jig body are formed with support sector, and support sector is in rank
Trapezoidal shape is set.
In a preferred embodiment of the present invention, the profile and size of the jig body and the profile of product to be sintered and
Size cooperates and sets.
In a preferred embodiment of the present invention, the interiors of products to be sintered is a cavity structure, the branch of jig body
The portion of holding projects upwards and is cooperated with cavity structure.
In a preferred embodiment of the present invention, the size in first gap is 0.05mm ~ 0.2mm.
In a preferred embodiment of the present invention, it is additionally provided between the jig body and the first gap of product to be sintered
One adherent layer.
In a preferred embodiment of the present invention, the adherent layer is aluminum oxide bisque.
In a preferred embodiment of the present invention, the jig body and product to be sintered have equal shrinkage factor.
In order to solve the above technical problems, another technical solution used in the present invention is：There is provided that a kind of MIM is degreasing sintered to be controlled
The degreasing sintered technique of tool, comprises the following steps：
A, degreasing goods of furniture for display rather than for use
Take jig body to be placed on alumina plate as support block, product to be sintered is placed in jig body again then
Face；
B, sour degreasing
Comprise the following steps that：
B1, preceding flushing：The product to be sintered and jig body that will be well placed are placed in debinding furnace together, close fire door, then
Furnace chamber is heated, it is to be heated at 100 ~ 140 DEG C toward being passed through nitrogen in furnace chamber, and be maintained at 100 ~ 140 DEG C rinse 50 ~
80min；
B2, catalysis：Continue to being passed through nitrogen in stove, while using nitric acid as catalyst, by measuring pump to being passed through in furnace chamber
Gaseous state nitric acid：
First stage, be passed through the flow of nitric acid for 2.0 ~ 3.8g/min, and be maintained at 100 ~ 140 DEG C to its catalytic reaction 100 ~
140min；
Second stage, is passed through the flow of nitric acid for 2.5 ~ 3.5g/min, and be maintained at 100 ~ 140 DEG C to its catalytic reaction 200 ~
300min；
Phase III, be passed through the flow of nitric acid for 3.0 ~ 4.0g/min, and be maintained at 100 ~ 140 DEG C to its catalytic reaction 200 ~
300min；
Under nitric acid catalytic action, the polyformaldehyde in product resolves into formaldehyde gas, formaldehyde gas and air burning and generates water
Discharged with after carbon dioxide；
B3, rear flushing：Stop to acid filling in debinding furnace furnace chamber, keep to nitrogen is passed through in furnace chamber, the time is 20 ~ 40min, furnace chamber
Interior waste gas is ejected by nitrogen, and takes out product to be sintered and jig body；
C, sintering goods of furniture for display rather than for use
Take out in step b through the product to be sintered and jig body after peracid acid degreasing, product to be sintered and jig body it
Between uniform layer overlay alumina powder；
D, sintering
Product to be sintered and jig body in step c are set and put into sintering furnace and is sintered together, comprised the following steps that：
D1, high temperature degreasing：Sintering in-furnace temperature is risen into 250 ~ 300 DEG C, height from room temperature with the heating rate of 4.2 ~ 5.2 DEG C/min
Warm 50 ~ 80min of degreasing；Rise to 300 ~ 800 DEG C with the heating rate of 1.0 ~ 1.6 DEG C/min again, carry out high temperature degreasing 350 ~
420min, the plastics impurity in product is removed, and then obtains the product after high temperature degreasing；
D2, vacuum-sintering：To continue with the heating rate pair of 2.8 ~ 3.8 DEG C/min by the product after high temperature degreasing in step d1
Heated in sintering furnace, be warming up to 800 ~ 1000 DEG C, 50 ~ 80min of sintering is kept under conditions of vacuum is less than 20Kpa；
D3, partial pressure sintering：After vacuum-sintering terminates, continue to being heated in stove according to the heating rate of 2.7 ~ 3.7 DEG C/min,
1000 DEG C ~ 1380 DEG C are warming up to, 100 ~ 160min is sintered under conditions of 20 ~ 30Kpa；Then sintering in-furnace temperature is maintained at
1380 DEG C, 150 ~ 200min of sintering is kept under conditions of 25 ~ 30Kpa of vacuum；
D4, stove are cold：After partial pressure sintering, the speed according to 4.3 ~ 5.3 DEG C/min keeps cooling to carrying out cooling down in sintering furnace
Time is 80 ~ 120min, is cooled to 800 ~ 900 DEG C；
D5, pressure cooling：Then continuation cooling is carried out to sintering furnace with the speed of 2.3 ~ 3.3 DEG C/min again, is kept for cool time
It is 250 ~ 330min, is cooled to 40 ~ 60 DEG C and continues to be down to room temperature；
E, terminate
Sintering terminates, and takes out product, and product and tool are separated, and the alumina powder that will be remained on product is cleaned out, after
Continuous processing completes processing.
The beneficial effects of the invention are as follows：The degreasing sintered tools of MIM of the present invention and degreasing sintered technique can realize big product,
The production of cavity class product and complex structure product, the intensity of product is guaranteed, and will not crack and cave in, not variable
Shape, high yield rate substantially increases the market competitiveness.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be to that will make needed for embodiment description
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing, wherein：
Fig. 1 is the structural representation of MIM of the invention degreasing sintered middle jig body one preferred embodiments；
Fig. 2 is the front view of Fig. 1；
Fig. 3 is the structural representation of the preferred embodiment of product to be sintered in MIM of the invention degreasing sintered；
Fig. 4 is the front view of Fig. 3；
Fig. 5 is the knot of one preferred embodiment when the degreasing sintered middle jig bodies of MIM of the invention are used cooperatively with product to be sintered
Structure schematic diagram；
The mark of each part is as follows in accompanying drawing：100th, jig body, 101, support sector, 200, product to be sintered, 201, cavity knot
Structure, the 300, first gap, the 400, second gap, 500, adherent layer.
Specific embodiment
The technical scheme in the embodiment of the present invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, this area is common
All other embodiment that technical staff is obtained under the premise of creative work is not made, belongs to the model of present invention protection
Enclose.
Fig. 1 to Fig. 5 is referred to, the embodiment of the present invention includes：
A kind of degreasing sintered tools of MIM, including：Jig body 100, jig body 100 is placed in the lower section of product to be sintered 200,
A support sector 101 is formed with jig body 100 to be supported for treating sintered products 200.
Specifically, support sector 101 is formed at the top ends of jig body, and support sector 101 is stepped shape setting.It is to be sintered
The inside of product 200 is a cavity structure 201, and the support sector 101 of jig body 100 projects upwards and mutual with cavity structure 201
Coordinate.
The profile and size of jig body 100 cooperate with the profile and size of product to be sintered 200 and set, and it is right to realize
Product to be sintered 200 is intactly supported comprehensively.
Jig body 100 is coordinated by support sector 101 with product to be sintered 200, and is reserved with both cooperations
Realize that product shrinks in one gap 300.
The size in above-mentioned first gap 300 is 0.05mm ~ 0.2mm, and different gaps are selected according to specific product.
During degreasing and sintering, jig body 100 plays a part of the support weight of product 200 to be sintered, and needs
Selected and the same material of product to be sintered 200 when being selected with the synchronous of product to be sintered 200, therefore the material of jig body 100
The MIM materials of material, or there is the MIM materials of equal shrinkage factor with product to be sintered 200.
Such as product 200 to be sintered is the material of 17-4PH, and jig body 100 must select the MIM materials of 17-4PH, or
From the MIM materials shunk on an equal basis with the material of product to be sintered 200, when jig body 100 and product to be sintered 200 coordinate, root
Different gaps are selected according to specific product.
In degreasing and sintering process, jig body 100 is placed on below product to be sintered 200, treats sintered products 200
Play a part of support, while there is the second gap 400 at two sides of jig body 100 and the cooperation of product to be sintered 200,
I.e. side stays the second gap 400 to realize empty avoiding.
An adherent layer 500 is additionally provided between jig body 100 and the first gap 300 of product to be sintered 200, is prevented de-
Product and tool stick together when fat is sintered.
Preferably, adherent layer 500 is aluminum oxide bisque.
Degreasing sintered specific embodiment is carried out using above-mentioned sintering tool as follows：
Embodiment one
A kind of degreasing sintered technique of the degreasing sintered tools of MIM, comprises the following steps：
A, degreasing goods of furniture for display rather than for use
Take jig body to be placed on alumina plate as support block, product to be sintered is placed in jig body again then
Face.
B, sour degreasing
Comprise the following steps that：
B1, preceding flushing：The product to be sintered and jig body that will be well placed are placed in debinding furnace together, close fire door, then
Furnace chamber is heated, it is to be heated to toward being passed through nitrogen in furnace chamber, and being maintained at 110 DEG C of flushing 70min at 110 DEG C.
B2, catalysis：Continue to being passed through nitrogen in stove, while using nitric acid as catalyst, by measuring pump in furnace chamber
It is passed through gaseous state nitric acid：
First stage, the flow of nitric acid is passed through for 2.8g/min, and be maintained at 110 DEG C to its catalytic reaction 115min；
Second stage, is passed through the flow of nitric acid for 3.2g/min, and be maintained at 110 DEG C to its catalytic reaction 235min；
Phase III, the flow of nitric acid is passed through for 3.6g/min, and be maintained at 110 DEG C to its catalytic reaction 235min；
Under nitric acid catalytic action, the polyformaldehyde in product resolves into formaldehyde gas, formaldehyde gas and air burning and generates water
Discharged with after carbon dioxide.
B3, rear flushing：Stop to acid filling in debinding furnace furnace chamber, keep to nitrogen is passed through in furnace chamber, the time is 65min, stove
Waste gas in chamber is ejected by nitrogen, and takes out product to be sintered and jig body.
C, sintering goods of furniture for display rather than for use
Take out in step b through the product to be sintered and jig body after peracid acid degreasing, product to be sintered and jig body it
Between uniform layer overlay alumina powder, product and tool are bonded together when preventing sintering.
D, sintering
Product to be sintered and jig body in step c are set and put into sintering furnace and is sintered together, comprised the following steps that：
D1, high temperature degreasing：Sintering in-furnace temperature is risen into 250 DEG C, high temperature degreasing from room temperature with the heating rate of 4.2 DEG C/min
80min；800 DEG C are risen to the heating rate of 1.0 DEG C/min again, high temperature degreasing 420min is carried out, the plastics in product are miscellaneous
Matter is removed, and then obtains the product after high temperature degreasing.
D2, vacuum-sintering：To continue with the heating rate pair of 2.8 DEG C/min by the product after high temperature degreasing in step d1
Heated in sintering furnace, be warming up to 1000 DEG C, sintering 80min is kept under conditions of vacuum is less than 20Kpa.
D3, partial pressure sintering：After vacuum-sintering terminates, continue to being heated in stove according to the heating rate of 2.7 DEG C/min,
1300 DEG C are warming up to, 130min is sintered under conditions of 20Kpa；Then sintering in-furnace temperature is maintained at 1350 DEG C, in vacuum
Sintering 200min is kept under conditions of degree 25Kpa.
D4, stove are cold：After partial pressure sintering, the speed according to 4.3 DEG C/min keeps cooling to carrying out cooling down in sintering furnace
Time is 110min, is cooled to 800 DEG C.
D5, pressure cooling：Then continuation cooling is carried out to sintering furnace with the speed of 2.3 DEG C/min again, is kept for cool time
It is 280min, is cooled to 50 DEG C and continues to be down to room temperature.
E, terminate
Sintering terminates, and takes out product, and product and tool are separated, and the alumina powder that will be remained on product is cleaned out, after
Continuous processing completes processing.
Embodiment two
A kind of degreasing sintered technique of the degreasing sintered tools of MIM, comprises the following steps：
A, degreasing goods of furniture for display rather than for use
Take jig body to be placed on alumina plate as support block, product to be sintered is placed in jig body again then
Face.
B, sour degreasing
Comprise the following steps that：
B1, preceding flushing：The product to be sintered and jig body that will be well placed are placed in debinding furnace together, close fire door, then
Furnace chamber is heated, it is to be heated to toward being passed through nitrogen in furnace chamber, and being maintained at 120 DEG C of flushing 60min at 120 DEG C.
B2, catalysis：Continue to being passed through nitrogen in stove, while using nitric acid as catalyst, by measuring pump in furnace chamber
It is passed through gaseous state nitric acid：
First stage, the flow of nitric acid is passed through for 2.5g/min, and be maintained at 120 DEG C to its catalytic reaction 120min；
Second stage, is passed through the flow of nitric acid for 3.0g/min, and be maintained at 120 DEG C to its catalytic reaction 240min；
Phase III, the flow of nitric acid is passed through for 3.5g/min, and be maintained at 120 DEG C to its catalytic reaction 240min；
Under nitric acid catalytic action, the polyformaldehyde in product resolves into formaldehyde gas, formaldehyde gas and air burning and generates water
Discharged with after carbon dioxide.
B3, rear flushing：Stop to acid filling in debinding furnace furnace chamber, keep to nitrogen is passed through in furnace chamber, the time is 60min, stove
Waste gas in chamber is ejected by nitrogen, and takes out product to be sintered and jig body.
C, sintering goods of furniture for display rather than for use
Take out in step b through the product to be sintered and jig body after peracid acid degreasing, product to be sintered and jig body it
Between uniform layer overlay alumina powder, product and tool are bonded together when preventing sintering.
D, sintering
Product to be sintered and jig body in step c are set and put into sintering furnace and is sintered together, comprised the following steps that：
D1, high temperature degreasing：Sintering in-furnace temperature is risen into 300 DEG C, high temperature degreasing from room temperature with the heating rate of 4.7 DEG C/min
60min；800 DEG C are risen to the heating rate of 1.3 DEG C/min again, high temperature degreasing 400min is carried out, the plastics in product are miscellaneous
Matter is removed, and then obtains the product after high temperature degreasing.
D2, vacuum-sintering：To continue with the heating rate pair of 3.3 DEG C/min by the product after high temperature degreasing in step d1
Heated in sintering furnace, be warming up to 1000 DEG C, sintering 60min is kept under conditions of vacuum is less than 20Kpa.
D3, partial pressure sintering：After vacuum-sintering terminates, continue to being heated in stove according to the heating rate of 3.2 DEG C/min,
1380 DEG C are warming up to, 120min is sintered under conditions of 20Kpa；Then sintering in-furnace temperature is maintained at 1380 DEG C, in vacuum
Sintering 180min is kept under conditions of degree 25Kpa.
D4, stove are cold：After partial pressure sintering, the speed according to 4.8 DEG C/min keeps cooling to carrying out cooling down in sintering furnace
Time is 100min, is cooled to 900 DEG C.
D5, pressure cooling：Then continuation cooling is carried out to sintering furnace with the speed of 2.8 DEG C/min again, is kept for cool time
It is 300min, is cooled to 50 DEG C and continues to be down to room temperature.
E, terminate
Sintering terminates, and takes out product, and product and tool are separated, and the alumina powder that will be remained on product is cleaned out, after
Continuous processing completes processing.
Embodiment three
A kind of degreasing sintered technique of the degreasing sintered tools of MIM, comprises the following steps：
A, degreasing goods of furniture for display rather than for use
Take jig body to be placed on alumina plate as support block, product to be sintered is placed in jig body again then
Face.
B, sour degreasing
Comprise the following steps that：
B1, preceding flushing：The product to be sintered and jig body that will be well placed are placed in debinding furnace together, close fire door, then
Furnace chamber is heated, it is to be heated to toward being passed through nitrogen in furnace chamber, and being maintained at 130 DEG C of flushing 80min at 130 DEG C.
B2, catalysis：Continue to being passed through nitrogen in stove, while using nitric acid as catalyst, by measuring pump in furnace chamber
It is passed through gaseous state nitric acid：
First stage, the flow of nitric acid is passed through for 2.2g/min, and be maintained at 130 DEG C to its catalytic reaction 100min；
Second stage, is passed through the flow of nitric acid for 2.8g/min, and be maintained at 130 DEG C to its catalytic reaction 240min；
Phase III, the flow of nitric acid is passed through for 3.4g/min, and be maintained at 130 DEG C to its catalytic reaction 240min；
Under nitric acid catalytic action, the polyformaldehyde in product resolves into formaldehyde gas, formaldehyde gas and air burning and generates water
Discharged with after carbon dioxide.
B3, rear flushing：Stop to acid filling in debinding furnace furnace chamber, keep to nitrogen is passed through in furnace chamber, the time is 60min, stove
Waste gas in chamber is ejected by nitrogen, and takes out product to be sintered and jig body.
C, sintering goods of furniture for display rather than for use
Take out in step b through the product to be sintered and jig body after peracid acid degreasing, product to be sintered and jig body it
Between uniform layer overlay alumina powder, product and tool are bonded together when preventing sintering.
D, sintering
Product to be sintered and jig body in step c are set and put into sintering furnace and is sintered together, comprised the following steps that：
D1, high temperature degreasing：Sintering in-furnace temperature is risen into 300 DEG C, high temperature degreasing from room temperature with the heating rate of 5.2 DEG C/min
70min；800 DEG C are risen to the heating rate of 1.6 DEG C/min again, high temperature degreasing 380min is carried out, the plastics in product are miscellaneous
Matter is removed, and then obtains the product after high temperature degreasing.
D2, vacuum-sintering：To continue with the heating rate pair of 3.8 DEG C/min by the product after high temperature degreasing in step d1
Heated in sintering furnace, be warming up to 950 DEG C, sintering 60min is kept under conditions of vacuum is less than 20Kpa.
D3, partial pressure sintering：After vacuum-sintering terminates, continue to being heated in stove according to the heating rate of 3.7 DEG C/min,
1380 DEG C are warming up to, 110min is sintered under conditions of 20Kpa；Then sintering in-furnace temperature is maintained at 1380 DEG C, in vacuum
Sintering 180min is kept under conditions of degree 25Kpa.
D4, stove are cold：After partial pressure sintering, the speed according to 5.3 DEG C/min keeps cooling to carrying out cooling down in sintering furnace
Time is 100min, is cooled to 700 DEG C.
D5, pressure cooling：Then continuation cooling is carried out to sintering furnace with the speed of 3.3 DEG C/min again, is kept for cool time
It is 330min, is cooled to 50 DEG C and continues to be down to room temperature.
E, terminate
Sintering terminates, and takes out product, and product and tool are separated, and the alumina powder that will be remained on product is cleaned out, after
Continuous processing completes processing.
In one ~ embodiment of embodiment three, product and tool can degreasing together, proper extension degreasing time, while
Sintering process also ensures that product and tool can be while use.
The degreasing sintered technique of the degreasing sintered tools of MIM of one ~ embodiment of embodiment three, it is possible to achieve the big product of size
The production of the tired product of product, cavity and complex structure product.
For example, the maximum product of production profile is 167.62*87.42*46.01mm at present, most heavy product up to 860g,
From profile and product weight, all make significant headway, substantially increased the competitiveness in market.
The beneficial effect of the degreasing sintered tools of MIM of the present invention and degreasing sintered technique is：
Product and tool can degreasings together, proper extension degreasing time, while sintering process also ensures that product and tool can
To use simultaneously；
The production of big product, cavity class product and complex structure product can be realized, the intensity of product is guaranteed, and will not produce
Crackle and cave in, be unlikely to deform, high yield rate substantially increases the market competitiveness.
Embodiments of the invention are the foregoing is only, the scope of the claims of the invention is not thereby limited, it is every to utilize this hair
Equivalent structure or equivalent flow conversion that bright description is made, or directly or indirectly it is used in other related technology necks
Domain, is included within the scope of the present invention.
Claims (9)
1. degreasing sintered tools of a kind of MIM, it is characterised in that including：Jig body, jig body is placed under product to be sintered
Side,
It is formed with a support sector in jig body to be supported for treating sintered products, jig body passes through support sector and treats
Sintered products are coordinated, be reserved with both cooperations the first gap realize product shrink, two sides of jig body with treat
There is the second gap to realize empty avoiding at the cooperation of sintered products.
2. degreasing sintered tools of MIM according to claim 1, it is characterised in that the top ends of the jig body are formed
There is a support sector, support sector is stepped shape setting.
3. degreasing sintered tools of MIM according to claim 2, it is characterised in that the profile and size of the jig body
Cooperated with the profile and size of product to be sintered and set.
4. degreasing sintered tools of MIM according to claim 3, it is characterised in that the interiors of products to be sintered is
Cavity configuration, the support sector of jig body projects upwards and is cooperated with cavity structure.
5. degreasing sintered tools of MIM according to claim 1, it is characterised in that the size in first gap is
0.05mm~0.2mm。
6. degreasing sintered tools of MIM according to claim 1, it is characterised in that the jig body and product to be sintered
The first gap between be additionally provided with an adherent layer.
7. degreasing sintered tools of MIM according to claim 6, it is characterised in that the adherent layer is aluminum oxide bisque.
8. degreasing sintered tools of MIM according to claim 1, it is characterised in that the jig body and product to be sintered
With equal shrinkage factor.
9. the degreasing sintered technique of a kind of degreasing sintered tools of MIM as described in any one of claim 1 ~ 8, it is characterised in that
Comprise the following steps：
A, degreasing goods of furniture for display rather than for use
Take jig body to be placed on alumina plate as support block, product to be sintered is placed in jig body again then
Face；
B, sour degreasing
Comprise the following steps that：
B1, preceding flushing：The product to be sintered and jig body that will be well placed are placed in debinding furnace together, close fire door, then
Furnace chamber is heated, it is to be heated at 100 ~ 140 DEG C toward being passed through nitrogen in furnace chamber, and be maintained at 100 ~ 140 DEG C rinse 50 ~
80min；
B2, catalysis：Continue to being passed through nitrogen in stove, while using nitric acid as catalyst, by measuring pump to being passed through in furnace chamber
Gaseous state nitric acid：
First stage, be passed through the flow of nitric acid for 2.0 ~ 3.8g/min, and be maintained at 100 ~ 140 DEG C to its catalytic reaction 100 ~
140min；
Second stage, is passed through the flow of nitric acid for 2.5 ~ 3.5g/min, and be maintained at 100 ~ 140 DEG C to its catalytic reaction 200 ~
300min；
Phase III, be passed through the flow of nitric acid for 3.0 ~ 4.0g/min, and be maintained at 100 ~ 140 DEG C to its catalytic reaction 200 ~
300min；
Under nitric acid catalytic action, the polyformaldehyde in product resolves into formaldehyde gas, formaldehyde gas and air burning and generates water
Discharged with after carbon dioxide；
B3, rear flushing：Stop to acid filling in debinding furnace furnace chamber, keep to nitrogen is passed through in furnace chamber, the time is 20 ~ 40min, furnace chamber
Interior waste gas is ejected by nitrogen, and takes out product to be sintered and jig body；
C, sintering goods of furniture for display rather than for use
Take out in step b through the product to be sintered and jig body after peracid acid degreasing, product to be sintered and jig body it
Between uniform layer overlay alumina powder；
D, sintering
Product to be sintered and jig body in step c are set and put into sintering furnace and is sintered together, comprised the following steps that：
D1, high temperature degreasing：Sintering in-furnace temperature is risen into 250 ~ 300 DEG C, height from room temperature with the heating rate of 4.2 ~ 5.2 DEG C/min
Warm 50 ~ 80min of degreasing；Rise to 300 ~ 800 DEG C with the heating rate of 1.0 ~ 1.6 DEG C/min again, carry out high temperature degreasing 350 ~
420min, the plastics impurity in product is removed, and then obtains the product after high temperature degreasing；
D2, vacuum-sintering：To continue with the heating rate pair of 2.8 ~ 3.8 DEG C/min by the product after high temperature degreasing in step d1
Heated in sintering furnace, be warming up to 800 ~ 1000 DEG C, 50 ~ 80min of sintering is kept under conditions of vacuum is less than 20Kpa；
D3, partial pressure sintering：After vacuum-sintering terminates, continue to being heated in stove according to the heating rate of 2.7 ~ 3.7 DEG C/min,
1000 DEG C ~ 1380 DEG C are warming up to, 100 ~ 160min is sintered under conditions of 20 ~ 30Kpa；Then sintering in-furnace temperature is maintained at
1380 DEG C, 150 ~ 200min of sintering is kept under conditions of 25 ~ 30Kpa of vacuum；
D4, stove are cold：After partial pressure sintering, the speed according to 4.3 ~ 5.3 DEG C/min keeps cooling to carrying out cooling down in sintering furnace
Time is 80 ~ 120min, is cooled to 800 ~ 900 DEG C；
D5, pressure cooling：Then continuation cooling is carried out to sintering furnace with the speed of 2.3 ~ 3.3 DEG C/min again, is kept for cool time
It is 250 ~ 330min, is cooled to 40 ~ 60 DEG C and continues to be down to room temperature；
E, terminate
Sintering terminates, and takes out product, and product and tool are separated, and the alumina powder that will be remained on product is cleaned out, after
Continuous processing completes processing.
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| CN108296479A (en) * | 2018-03-05 | 2018-07-20 | 曲靖中铭科技有限公司 | A kind of segmented high temperature degreasing method that can effectively improve degreasing part intensity |
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| CN108380888A (en) * | 2018-03-05 | 2018-08-10 | 曲靖中铭科技有限公司 | A kind of MIM manufacturing process of weak magnetic 17-4PH material parts |
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| CN112218733A (en) * | 2018-06-06 | 2021-01-12 | 通用电气公司 | Calibrator assembly for additive manufacturing |
| CN112218733B (en) * | 2018-06-06 | 2022-06-03 | 通用电气公司 | Calibrator assembly for additive manufacturing, method for additive manufacturing and part |
| CN110125418A (en) * | 2019-07-03 | 2019-08-16 | 江苏精研科技股份有限公司 | A kind of MIM titanium alloy preparation method improving surface abrasion resistance |
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| CN110640144A (en) * | 2019-10-22 | 2020-01-03 | 曲靖中铭科技有限公司 | Tapping-free sintering process for internal threads of MIM (metal injection molding) product |
| CN111872399A (en) * | 2020-08-22 | 2020-11-03 | 江苏精研科技股份有限公司 | Synchronous sintering method of titanium alloy or pure titanium product in powder injection molding |
| CN112427639A (en) * | 2020-12-07 | 2021-03-02 | 精研（东莞）科技发展有限公司 | MIM sintering process of 316L stainless steel |
| CN113649572A (en) * | 2021-07-23 | 2021-11-16 | 江门市前通粉末冶金厂有限公司 | Manufacturing process of cutting tool and tool |
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| WO2023155951A1 (en) * | 2022-02-16 | 2023-08-24 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V. | Method for producing a sintered component and sinter support for arranging a component blank within a sintering unit |
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