CN113547120B - Method for placing sintering jig for titanium and titanium alloy - Google Patents
Method for placing sintering jig for titanium and titanium alloy Download PDFInfo
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- CN113547120B CN113547120B CN202110847699.5A CN202110847699A CN113547120B CN 113547120 B CN113547120 B CN 113547120B CN 202110847699 A CN202110847699 A CN 202110847699A CN 113547120 B CN113547120 B CN 113547120B
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- 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
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
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- 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
- B22F2301/00—Metallic composition of the powder or its coating
- B22F2301/20—Refractory metals
- B22F2301/205—Titanium, zirconium or hafnium
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- Powder Metallurgy (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a placement method of a sintering jig for titanium and titanium alloy, wherein the sintering jig comprises a plurality of oxide ceramic plates, a plurality of small oxide ceramic containers, a plurality of sponge titanium and a plurality of titanium hydride powders; placing a titanium and titanium alloy green body on the oxide ceramic plate; placing the titanium sponge and the titanium hydride powder in the small oxide ceramic container; the titanium sponge and the titanium oxide powder are placed on the periphery of the titanium and titanium alloy powder and are positioned at the positions of the air inlet and the air outlet.
Description
Technical Field
The invention relates to a placing method of a sintering jig, and mainly relates to a placing method of a sintering jig for titanium and titanium alloy.
Background
Titanium and titanium alloy are very suitable for aviation and aerospace, because the specific gravity is only about 4.5, compared with the common iron and steel alloy, the specific gravity is as high as more than 7.8 and almost 1/2; moreover, titanium and titanium alloys have high strength and far superior weight ratio to lightweight aluminum and aluminum alloys, especially temperature and acid and alkali resistance, and titanium alloys are rolled into other commonly used metallic materials, which has been well known for nearly half a century.
However, the expensive degree of titanium and titanium alloy raw materials is high and low because of the difficulty of the refining process, and mainly, titanium and titanium alloy react and pollute all smelting vessel materials at high temperature, so that the processing of the titanium and titanium alloy raw materials into usable blanks is an inexpensive process. This of course also affects the subsequent processing of titanium and titanium alloys, the subtractive process is detrimental to the blank utilization of titanium and titanium alloys, and the substantial cutting and material removal results in wasted material, so powder forming, including conventional powder metallurgy (Powder Metallurgy) presses, powder forging, metal powder injection molding, and additive 3D printing, are important processes for titanium and titanium alloys.
The sintering and solidifying actions are inevitably needed in the powder manufacturing process to obtain the strength and final shape definition of the powder blank, and the action of high temperature at this time makes titanium and titanium alloy easily cause oxygen increase (poor vacuum degree) or carbon increase (insufficient degreasing of a sintering furnace adopting a graphite thermal field) because of the active characteristics of the titanium and titanium alloy, so that the brittleness of the titanium and titanium alloy sintered piece does not reach the expected strength standard.
Therefore, the invention designs the placing mode of the sintering jig for titanium and titanium alloy, uses a plurality of effective means as the jig in the sintering solidification process of powder forming, and places the jig for different furnace types.
Disclosure of Invention
In order to solve the problems, the invention provides a method for placing a sintering jig for titanium and titanium alloy, wherein the sintering jig comprises a plurality of oxide ceramic plates, a plurality of small oxide ceramic containers, a plurality of titanium sponge and a plurality of titanium hydride powders; placing a titanium and titanium alloy green body on the oxide ceramic plate; placing the titanium sponge and the titanium hydride powder in the oxide ceramic container; the titanium sponge and the titanium oxide powder are placed on the periphery of the titanium and titanium alloy green body and are positioned at the positions of the air inlet and the air outlet.
Further, in the metal sintering furnace having the inner box, the oxide ceramic plates are placed on each layer of the inner box, and the positions of the air outlet and the air inlet of each oxide ceramic plate are placed with the titanium sponge and the titanium oxide powder.
Furthermore, in the metal sintering furnace without the inner box, utilizing the oxide ceramic plates to build a plurality of layers of cuboid boxes, wherein two opposite side surfaces of each layer of cuboid box are not provided with side plates, and the two side surfaces are mutually communicated to form an air inlet and an air outlet; oxide ceramic plates are placed on each layer of the cuboid box body, and the positions of the air inlets and the air outlets of each layer are respectively provided with the titanium sponge and the titanium hydride powder.
Further, placing a large oxide ceramic plate in a vacuum sintering furnace of a graphite thermal field, placing the oxide ceramic plate on the bottom surface of the large oxide ceramic container, and placing a titanium and titanium alloy green body on the oxide ceramic plate; the titanium sponge and the titanium hydride powder are placed on the side edges of the oxide ceramic plate and are positioned at the positions of the air inlet and the air outlet; the large oxide ceramic container is covered with an oxide ceramic plate, and a gap is reserved between the oxide ceramic plate and the large oxide ceramic container through a gasket support.
Further, the weight ratio of the titanium and titanium alloy green body to the titanium sponge is 1:1-1:5; the weight ratio of the titanium and titanium alloy green body to the titanium hydride powder is 1:0.01-1:0.05.
Still further, the materials of the oxide ceramic plate, the small oxide ceramic container and the large oxide ceramic container are all alumina, zirconia or a mixture of the two; the density is greater than 98%.
Furthermore, equal amounts of titanium sponge and titanium hydride powder are respectively placed at the positions of the air inlet and the air outlet.
Further, the titanium sponge is of any shape but has an equivalent volume of a sphere with a diameter of less than 5 mm; the particle size of the titanium hydride powder is the equivalent volume of a sphere with a diameter of more than 0.5 mm.
The placement method of the sintering jig for titanium and titanium alloy provided by the invention has the following beneficial effects:
1. the green body of titanium and titanium alloy is placed on the oxide ceramic plate, so that the vessel can be prevented from reacting at high temperature, the pollution to the finished product of titanium and titanium alloy is caused, and the purity of the finished product of titanium and titanium alloy is improved.
2. Titanium sponge and titanium hydride powder are placed for absorbing oxygen and carbon in the air, so that the increase of oxygen and carbon content in the sintering process of titanium and titanium alloy is reduced; meanwhile, equal amounts of titanium sponge and titanium hydride powder are placed at the air inlet and the air outlet, so that the flowing direction and flowing process of air flow in the sintering process can be limited, and oxygen elements and carbon elements can be absorbed to the greatest extent.
3. In the vacuum metal sintering furnace without an inner box, a cuboid box body is built by adopting an oxide ceramic plate, a gasket is adopted between an upper layer and a lower layer, gaps can be formed, the flow direction of air flow is controlled, the positions of titanium sponge and titanium hydride powder placement, an air outlet and an air inlet are ensured, and the contents of oxygen and carbon in a finished product can be effectively reduced.
4. A large oxide ceramic container is placed in a vacuum sintering furnace of a graphite thermal field, so that carbon elements of graphite in a high-temperature state can be isolated; the large oxide ceramic container is covered with the oxide ceramic plate, and the middle of the large oxide ceramic container is isolated by the gasket to form a gap, so that the flowing direction of air flow can be effectively controlled, the positions of the titanium sponge and titanium hydride powder placement and the air outlet and the air inlet are ensured, and the contents of oxygen and carbon in a finished product can be effectively reduced.
5. The weight ratio of titanium to titanium alloy green body to titanium sponge is 1:1-1:5, and the weight ratio of titanium to titanium alloy to titanium hydride powder is 1:0.01-1:0.05, so that the maximum production efficiency can be achieved while the quality of the product can be ensured.
Drawings
Fig. 1 is a diagram of a placement method according to a first embodiment of the present invention.
Fig. 2 is a schematic view of the inner box structure of a metal sintering furnace according to a first embodiment of the present invention.
Fig. 3 is an exploded view of a multi-layered box constructed of an oxide ceramic plate according to the second embodiment of the present invention.
Fig. 4 is a structural view of a multi-layered box body constructed of an oxide ceramic plate according to the second embodiment of the present invention.
Fig. 5 is a schematic diagram of a method for placing graphite in a sintering furnace in a graphite thermal field according to a third embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a fourth embodiment of the present invention.
In the figure: 1. an oxide ceramic plate; 2. titanium sponge; 3. titanium hydride powder; 4. a small oxide ceramic vessel; 5. a large oxide ceramic vessel; 6. titanium and titanium alloy green body.
Detailed Description
Example 1
As shown in fig. 1 and 2, the invention provides a method for placing a sintering jig for titanium and titanium alloy, wherein the sintering jig comprises a plurality of oxide ceramic plates 1, a plurality of small oxide ceramic containers 4, a plurality of titanium sponge 2 and a plurality of titanium hydride powders 3; a titanium and titanium alloy green body 7 is placed on the oxide ceramic plate 1; the titanium sponge 2 and the titanium hydride powder 3 are placed in the small oxide ceramic container 4; the titanium sponge 2 and the titanium oxide powder 3 are placed on the periphery of a titanium and titanium alloy green body 7 and are positioned at the positions of an air inlet and an air outlet.
In a metal sintering furnace with an inner box, the oxide ceramic plates 1 are placed on each layer of the inner box, and the positions of an air outlet and an air inlet of each oxide ceramic plate 1 are respectively provided with the titanium sponge 2 and the titanium oxide powder 3.
The weight ratio of the titanium and titanium alloy green body to the titanium sponge is 1:1; the weight ratio of the titanium and titanium alloy green body to the titanium hydride powder was 1:0.01.
The materials of the oxide ceramic plate, the small oxide ceramic container and the large oxide ceramic container are all alumina, zirconia or a mixture of the alumina and the zirconia; the density is greater than 98%.
Equal amounts of titanium sponge and titanium hydride powder are respectively placed at the positions of the air inlet and the air outlet, and the weight ratio of the titanium and titanium alloy green body to the titanium sponge and the titanium hydride powder is 1:0.5 and 1:0.005.
The titanium sponge is of any shape but the equivalent volume of a sphere with the diameter smaller than 5 mm; the particle size of the titanium hydride powder is the equivalent volume of a sphere with a diameter of more than 0.5 mm.
Example two
As shown in fig. 3, in a metal vacuum sintering furnace without an inner box, using the oxide ceramic plate 1 to construct a multi-layer cuboid box body, wherein two opposite side surfaces of each layer of cuboid box body are not provided with side plates, and the two side surfaces are mutually communicated to form an air inlet and an air outlet; an oxide ceramic plate 1 is arranged on the bottom plate of each layer of cuboid box body; the positions of the air inlet and the air outlet of each layer are respectively provided with the titanium sponge 2 and the titanium hydride powder 3.
Example III
As shown in fig. 4, in a vacuum sintering furnace of a graphite thermal field, a large-sized oxide ceramic plate 5 is placed, an oxide ceramic plate 4 is placed on the bottom surface of the large-sized oxide ceramic container 5, and a titanium and titanium alloy green body 7 is placed on the oxide ceramic plate 1; the titanium sponge 2 and the titanium hydride powder 3 are placed on the side edge of the oxide ceramic plate 1 and are positioned at the air inlet and the air outlet; the large oxide ceramic container is covered with an oxide ceramic plate 1, and gaps are reserved between the oxide ceramic plate 1 and the large oxide ceramic container 5 through gasket support.
Example IV
As shown in fig. 5, in the metal sintering furnace without the inner box, the oxide ceramic plate 1 is placed on each layer of the inner box, and the titanium sponge 2 and the titanium hydride powder 3 are not placed at the positions of the air inlet and the air outlet, but are placed at any other positions. The weight ratio of the titanium and titanium alloy green body to the titanium sponge is 1:1; the weight ratio of the titanium and titanium alloy green body to the titanium hydride powder was 1:0.01.
Example five
In a metal sintering furnace with an inner box, using the oxide ceramic plate 1 to build a multi-layer cuboid box body, wherein two opposite side surfaces of each layer of cuboid box body are not provided with side plates, and the two side surfaces are mutually communicated to form an air inlet and an air outlet; an oxide ceramic plate 1 is arranged on the bottom plate of each layer of cuboid box body; the positions of the air inlet and the air outlet of each layer are respectively provided with the titanium sponge 2 and the titanium hydride powder 3. The weight ratio of the titanium and titanium alloy green body to the titanium sponge is 1:3; the weight ratio of the titanium and titanium alloy green body to the titanium hydride powder was 1:0.03. Equal amounts of titanium sponge and titanium hydride powder are respectively placed at the positions of the air inlet and the air outlet, and the weight ratio of the titanium and titanium alloy green body to the titanium sponge and the titanium hydride powder is 1:1.5 and 1:0.0015.
Example six
In a metal sintering furnace with an inner box, the oxide ceramic plate 1 is placed on each layer of the inner box, and the titanium sponge 2 and the titanium hydride powder 3 are placed at the positions of an air inlet and an air outlet. The weight ratio of the titanium and titanium alloy green body to the titanium sponge is 1:5; the weight ratio of the titanium and titanium alloy green body to the titanium hydride powder was 1:0.05. Equal amounts of titanium sponge and titanium hydride powder are respectively placed at the positions of the air inlet and the air outlet, and the weight ratio of the titanium and titanium alloy green body to the titanium sponge and the titanium hydride powder is 1:2.5 and 1:0.0025.
Example seven
In a metal sintering furnace with an inner box, the oxide ceramic plate 1 is placed on each layer of the inner box, and the titanium sponge 2 and the titanium hydride powder 3 are placed at the positions of an air inlet and an air outlet. The weight ratio of the titanium and titanium alloy green body to the titanium sponge is 1:0.8; the weight ratio of the titanium and titanium alloy green body to the titanium hydride powder was 1:0.008. Equal amounts of titanium sponge and titanium hydride powder are respectively placed at the positions of the air inlet and the air outlet, and the weight ratio of the titanium and titanium alloy green body to the titanium sponge and the titanium hydride powder is 1:0.4 and 1:0.004.
Example eight
In a metal sintering furnace with an inner box, the oxide ceramic plate 1 is placed on each layer of the inner box, and the titanium sponge 2 and the titanium hydride powder 3 are placed at the positions of an air inlet and an air outlet. The weight ratio of the titanium and titanium alloy green body to the titanium sponge is 1:8; the weight ratio of the titanium and titanium alloy green body to the titanium hydride powder was 1:0.08. Equal amounts of titanium sponge and titanium hydride powder are respectively placed at the positions of the air inlet and the air outlet, and the weight ratio of the titanium and titanium alloy green body to the titanium sponge and the titanium hydride powder is 1:4 and 1:0.04.
Comparative example
The method provided by the invention is not adopted, and the green body of titanium and titanium alloy is sintered according to the prior art.
TABLE 1 comparison of oxygen content, carbon content and loading efficiency
From the experimental data in table 1, it can be seen that the titanium and titanium alloy products obtained at the positions of the air inlet and the air outlet have high quality and low oxygen content and carbon content. As is clear from a comparison of the first, fifth, sixth and seventh examples, the optimum effect can be obtained only in the range of the present invention provided that the amounts of the titanium sponge and titanium hydride powder are smaller than the above range, and the present carbon content and oxygen content are increased. As is clear from comparison of the first and eighth examples, when the amounts of the titanium sponge and the titanium hydride powder are out of the numerical ranges provided by the present invention, the working efficiency is lowered. Therefore, as can be seen from table 1, the technical scheme provided by the invention can effectively reduce the oxygen content and the carbon content in the titanium and titanium alloy finished product, and can achieve the maximum working efficiency and the maximization of benefits.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. A placement method of a sintering jig for titanium and titanium alloy is characterized in that: the sintering jig comprises a plurality of oxide ceramic plates, a plurality of small oxide ceramic containers, a plurality of sponge titanium and a plurality of titanium hydride powders; placing a titanium and titanium alloy green body on the oxide ceramic plate; placing the titanium sponge and the titanium hydride powder in the small oxide ceramic container; the titanium sponge and the titanium hydride powder are placed at the periphery of the titanium and titanium alloy powder, and equal amounts of titanium sponge and titanium hydride powder are respectively placed at the positions of the air inlet and the air outlet; the weight ratio of the titanium and titanium alloy green body to the titanium sponge is 1:1-1:5; the weight ratio of the titanium and titanium alloy green body to the titanium hydride powder is 1:0.01-1:0.05.
2. The placement method of the sintering jig for titanium and titanium alloy according to claim 1, wherein the placement method is characterized in that: in the metal sintering furnace with the inner box, the oxide ceramic plates are placed on each layer of the inner box, and the positions of the air outlet and the air inlet of each oxide ceramic plate are respectively provided with the titanium sponge and the titanium hydride powder.
3. The placement method of the sintering jig for titanium and titanium alloy according to claim 1, wherein the placement method is characterized in that: constructing a multilayer cuboid box body by utilizing the oxide ceramic plate in a metal sintering furnace without an inner box; two opposite side surfaces of each layer of cuboid box body are not provided with side plates, and the two side surfaces are communicated with each other to form an air inlet and an air outlet; oxide ceramic plates are placed on the bottom plate of each layer of cuboid box body, and the positions of the air inlets and the air outlets of each layer of cuboid box body are respectively provided with the titanium sponge and the titanium hydride powder.
4. The method for placing the sintering jig for titanium and titanium alloy according to claim 3, wherein the method comprises the following steps: placing a large oxide ceramic container in a vacuum sintering furnace of a graphite thermal field, placing an oxide ceramic plate on the bottom surface of the large oxide ceramic container, and placing a titanium and titanium alloy green body on the oxide ceramic plate; the titanium sponge and the titanium hydride powder are placed on the side edges of the oxide ceramic plate and are positioned at the positions of the air inlet and the air outlet; the large oxide ceramic container is covered with an oxide ceramic plate, and a gap is reserved between the oxide ceramic plate and the large oxide ceramic container through a gasket support.
5. The method for placing the sintering jig for titanium and titanium alloy according to claim 4, wherein the method comprises the following steps: the oxide ceramic plate, the small oxide ceramic container and the large oxide ceramic container are all made of aluminum oxide, zirconium oxide or a mixture of the aluminum oxide and the zirconium oxide, and the density is more than 98%.
6. The placement method of the sintering jig for titanium and titanium alloy according to claim 1, wherein the placement method is characterized in that: the titanium sponge is of any shape but the equivalent volume of a sphere with the diameter smaller than 5 mm; the particle size of the titanium hydride powder is the equivalent volume of a sphere with a diameter of more than 0.5 mm.
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Citations (6)
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| CN1217243A (en) * | 1997-11-10 | 1999-05-26 | 中南工业大学 | Packaging sintering method for powdered metallurgical material and products thereof |
| US5911102A (en) * | 1996-06-25 | 1999-06-08 | Injex Corporation | Method of manufacturing sintered compact |
| CN104745864A (en) * | 2013-12-26 | 2015-07-01 | 北京有色金属研究总院 | A preparing process of a titanium-based getter |
| CN105355413A (en) * | 2015-12-07 | 2016-02-24 | 北京科技大学 | Method for preparing high-magnetism sintered neodymium iron boron by reducing sintering temperature |
| CN107971486A (en) * | 2017-12-12 | 2018-05-01 | 上海魁殊自动化科技有限公司 | One kind sintering gauge and its application method |
| CN211235094U (en) * | 2019-12-04 | 2020-08-11 | 江苏金物新材料有限公司 | On-line sampler |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7135141B2 (en) * | 2003-03-31 | 2006-11-14 | Hitachi Metals, Ltd. | Method of manufacturing a sintered body |
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- 2021-07-27 CN CN202110847699.5A patent/CN113547120B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5911102A (en) * | 1996-06-25 | 1999-06-08 | Injex Corporation | Method of manufacturing sintered compact |
| CN1217243A (en) * | 1997-11-10 | 1999-05-26 | 中南工业大学 | Packaging sintering method for powdered metallurgical material and products thereof |
| CN104745864A (en) * | 2013-12-26 | 2015-07-01 | 北京有色金属研究总院 | A preparing process of a titanium-based getter |
| CN105355413A (en) * | 2015-12-07 | 2016-02-24 | 北京科技大学 | Method for preparing high-magnetism sintered neodymium iron boron by reducing sintering temperature |
| CN107971486A (en) * | 2017-12-12 | 2018-05-01 | 上海魁殊自动化科技有限公司 | One kind sintering gauge and its application method |
| CN211235094U (en) * | 2019-12-04 | 2020-08-11 | 江苏金物新材料有限公司 | On-line sampler |
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Denomination of invention: A method for placing sintering fixtures for titanium and titanium alloys Granted publication date: 20231117 Pledgee: Bank of Nanjing Co.,Ltd. Taizhou Branch Pledgor: Jiangsu Jinwu New Material Co.,Ltd. Registration number: Y2024980004626 |