CN103553640B - Investment casting surface coating preparation method - Google Patents
Investment casting surface coating preparation method Download PDFInfo
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- CN103553640B CN103553640B CN201310454160.9A CN201310454160A CN103553640B CN 103553640 B CN103553640 B CN 103553640B CN 201310454160 A CN201310454160 A CN 201310454160A CN 103553640 B CN103553640 B CN 103553640B
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- Prior art keywords
- powder
- binding agent
- refractory
- refractory material
- dihydrogen phosphate
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- 239000011248 coating agent Substances 0.000 title abstract description 24
- 238000000576 coating method Methods 0.000 title abstract description 24
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 238000005495 investment casting Methods 0.000 title abstract description 4
- 239000000843 powder Substances 0.000 claims abstract description 52
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000011230 binding agent Substances 0.000 claims abstract description 20
- RGPUVZXXZFNFBF-UHFFFAOYSA-K diphosphonooxyalumanyl dihydrogen phosphate Chemical compound [Al+3].OP(O)([O-])=O.OP(O)([O-])=O.OP(O)([O-])=O RGPUVZXXZFNFBF-UHFFFAOYSA-K 0.000 claims abstract description 20
- 239000011819 refractory material Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 19
- 239000010453 quartz Substances 0.000 claims abstract description 19
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 239000002904 solvent Substances 0.000 claims abstract description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 12
- 238000005266 casting Methods 0.000 claims description 19
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 18
- 150000004760 silicates Chemical class 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 239000004411 aluminium Substances 0.000 claims description 11
- 239000000377 silicon dioxide Substances 0.000 claims description 9
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical class O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000010456 wollastonite Substances 0.000 claims description 4
- 229910052882 wollastonite Inorganic materials 0.000 claims description 4
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 3
- 239000002075 main ingredient Substances 0.000 claims description 3
- 229910052863 mullite Inorganic materials 0.000 claims description 3
- 229910052903 pyrophyllite Inorganic materials 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 17
- 238000005469 granulation Methods 0.000 abstract description 4
- 230000003179 granulation Effects 0.000 abstract description 4
- 238000001694 spray drying Methods 0.000 abstract description 4
- 229910001570 bauxite Inorganic materials 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract 4
- 239000008187 granular material Substances 0.000 abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical class O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 abstract 1
- 238000001035 drying Methods 0.000 abstract 1
- 235000019353 potassium silicate Nutrition 0.000 abstract 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 abstract 1
- 238000009415 formwork Methods 0.000 description 11
- 239000002344 surface layer Substances 0.000 description 7
- 229910052845 zircon Inorganic materials 0.000 description 7
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 7
- 150000002500 ions Chemical class 0.000 description 4
- 230000009970 fire resistant effect Effects 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Mold Materials And Core Materials (AREA)
- Ceramic Products (AREA)
Abstract
The invention relates to an investment casting surface coating preparation method thereof. According to the invention, powder of quartz, bauxite or a silicate refractory material is heated in a heating furnace; supersaturated water vapor mixed with sulfuric acid is delivered into the heating furnace; the powder material is discharged from the furnace and is rapidly cooled to normal temperature; the powder material is washed by using water, and is dried with a spray-drying manner; dried material is grinded into granules; the granules are mixed with aluminum sol with a weight percentage ratio of 1-1.2:1, and the mixture is sufficiently stirred; drying and granulation are carried out, and the mixture is grinded into refractory material powder; a binding agent water glass, aluminum dihydrogen phosphate, the refractory material powder and a proper amount of a solvent are selected; aluminum dihydrogen phosphate is dissolved in the solvent, such that a solution I is obtained; the solution I is added into the binding agent, and sufficient stirring is carried out; during the stirring process, the refractory material powder is added, and the mixture is well mixed through stirring; and the mixture is stood, such that the investment casting surface coating is obtained.
Description
Technical field
The invention belongs to Material Field, belong to moltening mold castings die casing material field, refer to a kind of moltening mold castings investment precoat manufacture method especially.
Background technology
The formwork coating of model casting is refractory material, and in model casting, formwork will have that high temperature resistant, heat chemistry is stable, hot expansibility is applicable to, and gas permeability and hulling performance need the performance requirement met foundry goods.And these all need the fireproof coating by manufacturing formwork to realize to the requirement of formwork.
The material that can be used in the fireproof coating manufacturing formwork is many, and the different surface layers simultaneously for formwork also may include different materials.Coating now for the manufacture of formwork can be divided three classes, i.e. formwork surface layer fireproof coating.Formwork back-up coat fireproof coating, ceramic core fireproof coating.And the silicon melten gel used in formwork manufactures is now main based on zircon, because the stable performance of zircon, the quality of final Ludox can not be affected, but higher being difficult to of the price of zircon reduces costs.The coating that can substitute zircon is being found by existing many research institutions, but never realizes.Now select for the manufacture of fire resistant coating material because all containing certain impurity, when preparation using silica-sol wash, the ion of leaching can have influence on the stability of using silica-sol wash.
Also some personnel's transition regime, and then how research can hinder existing fireproof coating material as not Lay powder, colliery powder, the ion in wollastonite etc. leaches, to realize the use of alternative zircon.Chinese patent number of patent application: CN200510079309.5, the patent describe a kind of composite investment casting fire resistant coating material, this technical scheme adopts quartz or bauxite or silicates refractory material to be core, outside described core, have aluminum oxide coating layer coated.But can find in actual use, still have the foreign ion of part to enter into coating, and have influence on the stable of coating, it is mainly in last abrasive process, and the impurity still having part is exposed.
Summary of the invention
The object of the invention is for the weak point of prior art to the formwork fireproof coating material after alternative zircon material, improvement opportunity scheme is proposed, make the technical program comparatively prior art compare, its coating property to improve, and less to the stability influence of fire-resistant using silica-sol wash.
The present invention is achieved by the following technical solutions:
A kind of model casting investment precoat manufacture method:
In heating furnace, the powder of quartz, aluminium vanadine or silicates refractory material is heated to 1050 DEG C-1150 DEG C, and constant temperature 10-30 minute;
After the oversaturated vapor of the 0.5-1.0MPa being mixed into 5-15ppm sulfuric acid being passed into heating furnace 10-15 minute, powder to be come out of the stove and fast cooling is washed to normal temperature;
In spray-dired mode, powder is dry, and grind into the particle of 50-300 micron;
The percentage by weight quartz of 50-300 micron, aluminium vanadine or silicates refractory material being pressed 1-1.2:1 mixes with Alumina gel and fully stirs; And grind into refractory powder after drying-granulating;
Density is selected to be 1.32-1.34g/cm
3waterglass is binding agent, aluminium dihydrogen phosphate, refractory powder and appropriate solvent;
The weight ratio of described refractory powder and binding agent is 1.25-1.35:1; The weight ratio of described refractory powder and aluminium dihydrogen phosphate is 1.5-2.0:1;
Aluminium dihydrogen phosphate is dissolved in solvent and obtains solution I; Solution I to be joined in binding agent and fully to stir; Refractory powder is added and by being uniformly mixed in whipping process; Leave standstill 0.5-1 hour.
Described drying-granulating is spraying dry.
The alumina weight content of described Alumina gel is 15%-30%; The pH value of described Alumina gel is 3.5-4.5.
Described quartz take silica as the natural silica of Main Ingredients and Appearance or the silica through high-temperature process.
Described silicates refractory material is kaolinite class or wollastonite; Described kaolinite class is gangue or mullite or pyrophyllite.
The invention has the beneficial effects as follows:
By the model casting surface layer coating material that the technical program is obtained, just can by the separated out ion remaval in most impurity in the early stage of carrying out quartz, aluminium vanadine or silicates refractory material, pass through the coated of later stage again, reduce about 25%-40% compared with the elemental release amount of prior art, the fireproof coating of zircon can be substituted completely.
Detailed description of the invention
Describe technical scheme of the present invention in detail below by way of specific embodiment, should be understood that, following embodiment is only exemplary, only can be used for explaining and technical scheme of the present invention being described, and can not be interpreted as being the restriction to technical solution of the present invention.
A kind of preparation method of model casting surface layer fireproof coating:
In heating furnace, the powder of quartz, aluminium vanadine or silicates refractory material is heated to 1050 DEG C-1150 DEG C, and constant temperature 10-30 minute;
After the oversaturated vapor of the 0.5-1.0MPa being mixed into 5-15ppm sulfuric acid being passed into heating furnace 10-15 minute, powder to be come out of the stove and fast cooling is washed to normal temperature;
In spray-dired mode, powder is dry, and grind into the particle of 50-300 micron;
The percentage by weight quartz of 50-300 micron, aluminium vanadine or silicates refractory material being pressed 1-1.2:1 mixes with Alumina gel and fully stirs; And drying-granulating;
Density is selected to be 1.32-1.34g/cm
3waterglass is binding agent, aluminium dihydrogen phosphate, refractory powder and appropriate solvent;
The weight ratio of described refractory powder and binding agent is 1.25-1.35:1; The weight ratio of described refractory powder and aluminium dihydrogen phosphate is 1.5-2.0:1;
Aluminium dihydrogen phosphate is dissolved in solvent and obtains solution I; Solution I to be joined in binding agent and fully to stir; Refractory powder is added and by being uniformly mixed in whipping process; Leave standstill 0.5-1 hour.
Described drying-granulating is spraying dry.
The alumina weight content of described Alumina gel is 15%-30%; The pH value of described Alumina gel is 3.5-4.5.
Described quartz take silica as the natural silica of Main Ingredients and Appearance or the silica through high-temperature process.
Described silicates refractory material is kaolinite class or wollastonite; Described kaolinite class is gangue or mullite or pyrophyllite.
In following specific embodiment of the present invention, distinguishing is only the difference of refractory material, is only quartz is replaced with aluminium vanadine or replace with kaolinite lamp material; In manufacturing process, the pressure of oversaturated vapor and sulfuric acid mixed steam is different in various embodiments, and such difference was solved by the reaction time, that is, when supersaturated vapor pressure hour, reaction time corresponding prolongation, when supersaturated vapor pressure height, the reaction time reduces.But supersaturated vapor pressure should not higher than 1.0MPa.
Embodiment 1
A kind of preparation method of model casting surface layer fireproof coating:
In heating furnace, the powder of quartz is heated to 1050 DEG C, and constant temperature 10-15 minute;
The oversaturated vapor of the 0.5MPa being mixed into 10ppm sulfuric acid is passed into heating furnace after 15 minutes, powder to be come out of the stove and fast cooling is washed to normal temperature;
In spray-dired mode, powder is dry, and grind into the particle of 50-300 micron;
Be 30% by the quartz of 50-300 micron by the percentage by weight of 1:1 and alumina weight content; PH value is the Alumina gel mixing of 3.5-4.5 and fully stirs; And by obtaining moltening mold castings die casing material by grinding after spray drying granulation;
Density is selected to be 1.32-1.34g/cm
3waterglass is binding agent, aluminium dihydrogen phosphate, refractory powder and appropriate solvent;
The weight ratio of described refractory powder and binding agent is 1.25-1.35:1; The weight ratio of described refractory powder and aluminium dihydrogen phosphate is 1.5-2.0:1;
Aluminium dihydrogen phosphate is dissolved in solvent and obtains solution I; Solution I to be joined in binding agent and fully to stir; Refractory powder is added and by being uniformly mixed in whipping process; Leave standstill 0.5-1 hour.
In the present embodiment can aluminium vanadine or silicates refractory material, all the other technical schemes are identical.
Embodiment 2
A kind of preparation method of model casting surface layer fireproof coating:
In heating furnace, the powder of quartz is heated to 1150 DEG C, and constant temperature 15-20 minute;
The oversaturated vapor of the 0.8MPa being mixed into 15ppm sulfuric acid is passed into heating furnace after 12 minutes, powder to be come out of the stove and fast cooling is washed to normal temperature;
In spray-dired mode, powder is dry, and grind into the particle of 50-300 micron;
Be 25% by the quartz of 50-300 micron by the percentage by weight of 1.2:1 and alumina weight content; PH value is the Alumina gel mixing of 3.5 and fully stirs; And by obtaining moltening mold castings die casing material by grinding after spray drying granulation;
Density is selected to be 1.32-1.34g/cm
3waterglass is binding agent, aluminium dihydrogen phosphate, refractory powder and appropriate solvent;
The weight ratio of described refractory powder and binding agent is 1.25-1.35:1; The weight ratio of described refractory powder and aluminium dihydrogen phosphate is 1.5-2.0:1;
Aluminium dihydrogen phosphate is dissolved in solvent and obtains solution I; Solution I to be joined in binding agent and fully to stir; Refractory powder is added and by being uniformly mixed in whipping process; Leave standstill 0.5-1 hour.
In the present embodiment can aluminium vanadine or silicates refractory material, all the other technical schemes are identical.This embodiment is optimum embodiment.
Embodiment 3
A kind of preparation method of model casting surface layer fireproof coating:
In heating furnace, the powder of quartz is heated to 1100 DEG C, and constant temperature 20-30 minute;
The oversaturated vapor of the 1.0MPa being mixed into 12ppm sulfuric acid is passed into heating furnace after 12 minutes, powder to be come out of the stove and fast cooling is washed to normal temperature;
In spray-dired mode, powder is dry, and grind into the particle of 50-300 micron;
Be 20% by the quartz of 50-300 micron by the percentage by weight of 1.1:1 and alumina weight content; PH value is the Alumina gel mixing of 4.5 and fully stirs; And by obtaining moltening mold castings die casing material by grinding after spray drying granulation;
Density is selected to be 1.32-1.34g/cm
3waterglass is binding agent, aluminium dihydrogen phosphate, refractory powder and appropriate solvent;
The weight ratio of described refractory powder and binding agent is 1.25-1.35:1; The weight ratio of described refractory powder and aluminium dihydrogen phosphate is 1.5-2.0:1;
Aluminium dihydrogen phosphate is dissolved in solvent and obtains solution I; Solution I to be joined in binding agent and fully to stir; Refractory powder is added and by being uniformly mixed in whipping process; Leave standstill 0.5-1 hour.
In the present embodiment can aluminium vanadine or silicates refractory material, all the other technical schemes are identical.
Claims (5)
1. a model casting investment precoat manufacture method, is characterized in that:
In heating furnace, the powder of quartz, aluminium vanadine or silicates refractory material is heated to 1050 DEG C-1150 DEG C, and constant temperature 10-30 minute;
After the oversaturated vapor of the 0.5-1.0MPa being mixed into 5-15ppm sulfuric acid being passed into heating furnace 10-15 minute, powder to be come out of the stove and fast cooling is washed to normal temperature;
In spray-dired mode, powder is dry, and grind into the particle of 50-300 micron;
The percentage by weight quartz of 50-300 micron, aluminium vanadine or silicates refractory material being pressed 1-1.2:1 mixes with Alumina gel and fully stirs; And grind into refractory powder after drying-granulating;
Density is selected to be 1.32-1.34g/cm
3waterglass is binding agent, aluminium dihydrogen phosphate, refractory powder and appropriate solvent;
The weight ratio of described refractory powder and binding agent is 1.25-1.35:1; The weight ratio of described refractory powder and aluminium dihydrogen phosphate is 1.5-2.0:1;
Aluminium dihydrogen phosphate is dissolved in solvent and obtains solution I; Solution I to be joined in binding agent and fully to stir; Refractory powder is added and by being uniformly mixed in whipping process; Leave standstill 0.5-1 hour.
2. model casting investment precoat manufacture method according to claim 1, is characterized in that: described drying-granulating is spraying dry.
3. model casting investment precoat manufacture method according to claim 1, is characterized in that: the alumina weight content of described Alumina gel is 15%-30%; The pH value of described Alumina gel is 3.5-4.5.
4. model casting investment precoat manufacture method according to claim 1, is characterized in that: described quartz take silica as the natural silica of Main Ingredients and Appearance or the silica through high-temperature process.
5. model casting investment precoat manufacture method according to claim 1, is characterized in that: described silicates refractory material is kaolinite class or wollastonite; Described kaolinite class is gangue or mullite or pyrophyllite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310454160.9A CN103553640B (en) | 2013-09-27 | 2013-09-27 | Investment casting surface coating preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310454160.9A CN103553640B (en) | 2013-09-27 | 2013-09-27 | Investment casting surface coating preparation method |
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| Publication Number | Publication Date |
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| CN103553640A CN103553640A (en) | 2014-02-05 |
| CN103553640B true CN103553640B (en) | 2015-03-04 |
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| CN201310454160.9A Expired - Fee Related CN103553640B (en) | 2013-09-27 | 2013-09-27 | Investment casting surface coating preparation method |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105798240A (en) * | 2016-04-27 | 2016-07-27 | 无锡环宇精密铸造有限公司 | Method for forming coal gangue sand for precision casting facing sand |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101092526A (en) * | 2006-06-23 | 2007-12-26 | 宜兴市华晶化工厂 | Specific fire resistant paint and preparation method |
| CN101891444A (en) * | 2010-07-09 | 2010-11-24 | 三一重工股份有限公司 | Reinforced layer coating for use in hot investment casting and preparation method thereof |
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2013
- 2013-09-27 CN CN201310454160.9A patent/CN103553640B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101092526A (en) * | 2006-06-23 | 2007-12-26 | 宜兴市华晶化工厂 | Specific fire resistant paint and preparation method |
| CN101891444A (en) * | 2010-07-09 | 2010-11-24 | 三一重工股份有限公司 | Reinforced layer coating for use in hot investment casting and preparation method thereof |
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