CN102490253A - Forming method and forming mold for alumina ceramic crucible - Google Patents
Forming method and forming mold for alumina ceramic crucible Download PDFInfo
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- CN102490253A CN102490253A CN2011103722186A CN201110372218A CN102490253A CN 102490253 A CN102490253 A CN 102490253A CN 2011103722186 A CN2011103722186 A CN 2011103722186A CN 201110372218 A CN201110372218 A CN 201110372218A CN 102490253 A CN102490253 A CN 102490253A
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- aluminium oxide
- crucible
- oxide ceramics
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Abstract
The invention relates to a method and a forming mold for manufacturing an alumina ceramics crucible by isostatic pressing. The method is characterized that the forming process comprises the following steps: (1) carrying out mixed milling on alpha alumina powder, additive and water to prepare homogeneous slurry; (2) screening and deironing the slurry, and carrying out spray granulation by a spray drying tower; (3) after the spray drying tower carries out spray granulation, putting the granules into the mold and pressing to obtain a crucible pre-formed blank; and (4) finishing the blank, and sintering at high temperature to obtain the alumina ceramic crucible. The alumina ceramic crucible manufactured with the method provided by the invention has the advantages of smooth inner surface and outer surface, high smooth finish, high and even blank density, high strength, small sintering shrinkage strain, accurate size, and high finished product rate; and the method has the advantages of moderate labor intensity and short production period, and is suitable for mass production.
Description
Technical field
The present invention relates to a kind of method and mould thereof that adopts isostatic compaction to make the aluminium oxide ceramics crucible.
Background technology
The traditional preparation method of aluminium oxide ceramics crucible is to use the slip casting method moulding, is about to calcined alumina fine powder, additive and suitable quantity of water wet mixing mill in ball mill, the calcined alumina fine powder evenly is suspended in becomes slip in the solution; Be injected with then in the plaster mold of water absorbing properties, through behind the certain hour, slurry is adsorbed on the gypsum die wall; When wall thickness reaches requirement, the slip that is not adsorbed in the plaster mold is discharged, in plaster mold, leave one deck and be adsorbed on the slurry that solidifies on the gypsum die wall; Carry out the demoulding after to be dried; Become the crucible base substrate, after base substrate carries out drying under suitable condition, obtain the aluminium oxide ceramics crucible through high temperature sintering again.Employing the method is made crucible, and blank strength is low, and drying is shunk greatly with burning till, and yield rate is low.Slip casting method also needs a large amount of gypsum molds, and labour intensity is big, and production efficiency is low, and the production cycle is long, is difficult to form large-scale batch process the in batches.
Summary of the invention
The objective of the invention is the shortcoming to above-mentioned existence, it is easy to propose a kind of not only forming method, and good product quality, yield rate height, and can adapt to the aluminium oxide ceramics crucible forming method and the mould thereof of large-scale production.
A kind of forming method of aluminium oxide ceramics crucible is characterized in that the step of its forming process comprises:
(1) alpha-aluminium oxide powder, additive and water are carried out mix grinding, process uniform slurry;
(2) with above-mentioned slurry sieve and deironing after, spray-dried tower mist projection granulating;
(3) behind the mist projection granulating, powder is packed in the mould, makes crucible preformed base substrate;
(4) with after the base substrate finishing, carry out high temperature sintering, obtain the aluminium oxide ceramics crucible.
The forming method of a kind of aluminium oxide ceramics crucible of the present invention is characterized in that described alpha-aluminium oxide powder is the alpha-aluminium oxide fine powder, and granularity is 1.3～1.5 μ m.
The forming method of a kind of aluminium oxide ceramics crucible of the present invention is characterized in that it is in agitating ball mill, to carry out that described alpha-aluminium oxide powder, additive and water carry out mix grinding, and the mix grinding time is 2～3 hours.
The forming method of a kind of aluminium oxide ceramics crucible of the present invention is characterized in that described spray drying tower mist projection granulating, and granulation powder moisture Control is 0.3%～0.5%.
The forming method of a kind of aluminium oxide ceramics crucible of the present invention; It is characterized in that described compacting makes crucible preformed base substrate process above-mentioned granulation powder is packed in the crucible die chamber; The envelope mould is put into the high-pressure molding cylinder of isostatic pressing machine; Pressurize is 10～20 minutes under the pressure of 100～200MPa, takes out the demoulding, makes the crucible preform.
The forming method of a kind of aluminium oxide ceramics crucible of the present invention is characterized in that described base substrate is a sintering under 1710～1750 ℃ of high temperature.
The forming method of a kind of aluminium oxide ceramics crucible of the present invention is characterized in that described additive is kaolin, precipitated calcium carbonate, section burning talcum, silicon powder, yittrium oxide; The ratio that its alpha-aluminium oxide powder, additive and water carry out mix grinding is 1:0.55.
A kind of mould of aluminium oxide ceramics crucible is characterized in that its structure comprises:
Core-this core is the stainless core body of the aluminium oxide ceramics crucible inner wall shape coupling of flat, top profile and preparation;
Core is outer, the bottom has uncovered, last top and is provided with the rubber package set that slip injects the mouth of pipe in order to be sleeved on the adaptive gap of core profile for rubber package set-this jacket;
Under locate sealing-plug-sealing choker block in core bottom, plug is loaded on the rubber package set bottom and has uncovered inwall place;
Following restraint zone-this restraint zone is positioned at the rubber package set bottom outside, and rubber package set taut band and following location sealing-plug are tightened together;
Last sealing-plug-sealing plug is loaded on core bottom, and plug is loaded on the rubber package set top and is provided with slip and injects the mouth of pipe;
Last restraint zone-this restraint zone is positioned at that the top is provided with the slip ascending pipe on the rubber package set, and rubber package set taut band and last sealing-plug are tightened together.
The mould of a kind of aluminium oxide ceramics crucible of the present invention is characterized in that gap between core and the rubber package set is greater than 9 millimeters.
The mould of a kind of aluminium oxide ceramics crucible of the present invention, the external diameter and the length that it is characterized in that described core are all greater than 90 millimeters.
The forming method of a kind of aluminium oxide ceramics crucible of the present invention, the aluminium oxide ceramics crucible crucible surfaces externally and internally of making is smooth, highly polished; The density of base substrate is high, even, and intensity is big; It is little to burn till contraction distortion, and size is accurate, and yield rate is high; Labour intensity is moderate, and is with short production cycle, can be mass-produced.
Description of drawings
Fig. 1 is the crucible die cutaway view.
The specific embodiment
A kind of forming method of aluminium oxide ceramics crucible, the step of its moulding comprises:
A, preparation powder with alpha-aluminium oxide fine powder, additive and suitable quantity of water mix grinding 2～3 hours in agitating ball mill, make alpha-aluminium oxide fine powder and additive evenly be suspended in form slurry in the solution.Above-mentioned slurry is crossed 100 mesh sieves and deironing, spray-dried tower mist projection granulating, granulation powder moisture Control is 0.3%～0.5%.
B, adorn molded crucible base substrate, above-mentioned granulation powder is packed in the crucible die chamber, the envelope mould is put into the high-pressure molding cylinder of isostatic pressing machine, and pressurize is 10～20 minutes under the pressure of 100～200MPa, takes out the demoulding, makes the crucible preform.
C, base substrate finishing are repaired the crucible preform according to the technological requirement size.
D, high temperature sintering with above-mentioned base substrate sintering under 1710 ℃～1750 ℃ high temperature through finishing, obtain the aluminium oxide ceramics crucible.
A kind of mould of aluminium oxide ceramics crucible, its structure comprises:
Core 1-this core is the stainless core body of the aluminium oxide ceramics crucible inner wall shape coupling of flat, top profile and preparation;
Core is outer, the bottom has uncovered, last top and is provided with the rubber package set that slip injects the mouth of pipe in order to be sleeved on the adaptive gap of core profile for rubber package set 2-this jacket;
Under locate sealing-plug 3-sealing choker block in core bottom, plug is loaded on the rubber package set bottom and has uncovered inwall place;
Following restraint zone 4-this restraint zone is positioned at the rubber package set bottom outside, and rubber package set taut band and following location sealing-plug are tightened together;
Last sealing-plug 5-sealing plug is loaded on core bottom, and plug is loaded on the rubber package set top and is provided with slip and injects the mouth of pipe;
Last restraint zone 6-this restraint zone is positioned at that the top is provided with the slip ascending pipe on the rubber package set, and rubber package set taut band and last sealing-plug are tightened together.
Embodiment 1
Make 95 aluminium oxide ceramics crucibles
With α-Al
2O
393.5 kilograms of fine powders, 1 kilogram of silicon powder, 1.5 kilograms of precipitated calcium carbonates, 2 kilograms of kaolin, 1.5 kilograms of calcination of talc, 0.5 kilogram of yittrium oxide, 0.5 kilogram of HF-2 dispersant, 1 kilogram of polyvinyl alcohol, 1 kilogram of emulsifying wax and water place agitating ball mill for 55 kilograms, and ball milling was processed slurry in 2 hours.Slurry is crossed 100 mesh sieves and deironing, spray-dried tower mist projection granulating, granulation powder moisture Control is 0.3%～0.5%.Above-mentioned granulation powder is packed in the crucible die chamber, and the envelope mould is put into the high-pressure molding cylinder of isostatic pressing machine, and pressurize is 15 minutes under the pressure of 150MPa, takes out the demoulding, makes the crucible base substrate.Above-mentioned base substrate after repairing under 1710 ℃ of high temperature sintering, obtain 95 aluminium oxide ceramics crucibles.
Embodiment 2
Make 99 aluminium oxide ceramics crucibles
With α-Al
2O
399 kilograms of fine powders, 0.6 kilogram of calcination of talc, 0.4 kilogram of yittrium oxide, 0.5 kilogram of HF-2 dispersant, 1.2 kilograms of polyvinyl alcohol, 1.2 kilograms of emulsifying waxs and water place agitating ball mill for 55 kilograms, and ball milling was processed slurry in 3 hours.Slurry is crossed 100 mesh sieves and deironing, spray-dried tower mist projection granulating, granulation powder moisture Control is 0.3%～0.5%.Above-mentioned granulation powder is packed in the crucible die chamber, and the envelope mould is put into the high-pressure molding cylinder of isostatic pressing machine, and pressurize is 20 minutes under the pressure of 200MPa, takes out the demoulding, makes the crucible base substrate.Above-mentioned base substrate after repairing under 1750 ℃ of high temperature sintering, obtain 99 aluminium oxide ceramics crucibles.
Claims (10)
1. the forming method of an aluminium oxide ceramics crucible is characterized in that the step of its forming process comprises:
(1) alpha-aluminium oxide powder, additive and water are carried out mix grinding, process the uniform sizing material of alpha-aluminium oxide powder and additive; (2) (2) with above-mentioned slurry sieve and deironing after, spray-dried tower mist projection granulating;
(3) behind the spray drying tower mist projection granulating, in the mould of packing into, make crucible preformed base substrate;
(4) with after the base substrate finishing, carry out high temperature sintering, obtain the aluminium oxide ceramics crucible.
2. the forming method of a kind of aluminium oxide ceramics crucible according to claim 1 is characterized in that described alpha-aluminium oxide powder is the alpha-aluminium oxide fine powder, and granularity is 1.3～1.5 μ m.
3. the forming method of a kind of aluminium oxide ceramics crucible according to claim 1 is characterized in that it is in agitating ball mill, to carry out that described alpha-aluminium oxide powder, additive and water carry out mix grinding, and the mix grinding time is 2～3 hours.
4. the forming method of a kind of aluminium oxide ceramics crucible according to claim 1 is characterized in that described spray drying tower mist projection granulating, and granulation powder moisture Control is 0.3%～0.5%.
5. the forming method of a kind of aluminium oxide ceramics crucible according to claim 1; It is characterized in that described compacting makes crucible preformed base substrate process above-mentioned granulation powder is packed in the crucible die chamber; The envelope mould is put into the high-pressure molding cylinder of isostatic pressing machine; Pressurize is 10～20 minutes under the pressure of 100～200MPa, takes out the demoulding, makes the crucible preform.
6. the forming method of a kind of aluminium oxide ceramics crucible according to claim 1 is characterized in that described base substrate is a sintering under 1710～1750 ℃ of high temperature.
7. the forming method of a kind of aluminium oxide ceramics crucible according to claim 1 is characterized in that described additive is kaolin, precipitated calcium carbonate, section burning talcum, silicon powder, yittrium oxide; Its alpha-aluminium oxide powder, additive and water carry out the ratio 1:0.55 of mix grinding.
8. the mould of an aluminium oxide ceramics crucible is characterized in that its structure comprises:
Core-this core is the stainless core body of the aluminium oxide ceramics crucible inner wall shape coupling of flat, top profile and preparation;
Core is outer, the bottom has uncovered, last top and is provided with the rubber package set that slip injects the mouth of pipe in order to be sleeved on the adaptive gap of core profile for rubber package set-this jacket;
Under locate sealing-plug-sealing choker block in core bottom, plug is loaded on the rubber package set bottom and has uncovered inwall place;
Following restraint zone-this restraint zone is positioned at the rubber package set bottom outside, and rubber package set taut band and following location sealing-plug are tightened together;
Last sealing-plug-sealing plug is loaded on core bottom, and plug is loaded on the rubber package set top and is provided with slip and injects the mouth of pipe;
Last restraint zone-this restraint zone is positioned at that the top is provided with the slip ascending pipe on the rubber package set, and rubber package set taut band and last sealing-plug are tightened together.
9. the mould of a kind of aluminium oxide ceramics crucible according to claim 8 is characterized in that gap between core and the rubber package set is greater than 9 millimeters.
10. the mould of a kind of aluminium oxide ceramics crucible according to claim 8, the external diameter and the length that it is characterized in that described core are all greater than 90 millimeters.
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| CN2011103722186A CN102490253A (en) | 2011-11-22 | 2011-11-22 | Forming method and forming mold for alumina ceramic crucible |
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| CN2011103722186A CN102490253A (en) | 2011-11-22 | 2011-11-22 | Forming method and forming mold for alumina ceramic crucible |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102706147A (en) * | 2012-06-20 | 2012-10-03 | 江苏美特林科特殊合金有限公司 | Alumina crucible provided with slag hole and used for producing high-purity intermediate alloy by using perrin process, and preparation process thereof |
| CN106217621A (en) * | 2016-08-25 | 2016-12-14 | 德清三明坩埚有限公司 | A kind of lower die structure of crucible forming machine |
| CN106423329A (en) * | 2016-09-17 | 2017-02-22 | 德阳市科瑞仪器设备厂 | Sample melting cup and processing method thereof |
| CN106493834A (en) * | 2016-11-16 | 2017-03-15 | 上海卡贝尼精密陶瓷有限公司 | The ceramic another part isostatic cool pressing base particular manufacturing craft of deep chamber top dome alms bowl class and using method |
| CN107244905A (en) * | 2017-06-05 | 2017-10-13 | 长兴华悦耐火材料厂 | A kind of preparation method of face coat high-temperature crucible |
| CN107311628A (en) * | 2017-06-05 | 2017-11-03 | 长兴华悦耐火材料厂 | A kind of high-temperature crucible of face coat |
| CN107805752A (en) * | 2017-11-03 | 2018-03-16 | 聊城鼎硕新材料有限公司 | One kind fusing rafifinal crucible and preparation method thereof |
| CN108298961A (en) * | 2018-02-28 | 2018-07-20 | 清华大学 | Hemispherical product and its preparation method and application |
| CN108947541A (en) * | 2018-06-28 | 2018-12-07 | 东莞信柏结构陶瓷股份有限公司 | 3D ceramics rear cover and preparation method thereof |
| CN109333756A (en) * | 2018-11-29 | 2019-02-15 | 贵州大东风机械股份有限公司 | A kind of casting mould and method for polycrystalline crucible |
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| DE4420172B4 (en) * | 1994-06-09 | 2006-08-17 | Dieffenbacher Gmbh + Co. Kg | Tool for isostatic pressing of crucibles |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102706147A (en) * | 2012-06-20 | 2012-10-03 | 江苏美特林科特殊合金有限公司 | Alumina crucible provided with slag hole and used for producing high-purity intermediate alloy by using perrin process, and preparation process thereof |
| CN102706147B (en) * | 2012-06-20 | 2014-07-09 | 江苏美特林科特殊合金有限公司 | Alumina crucible provided with slag hole and used for producing high-purity intermediate alloy by using perrin process, and preparation process thereof |
| CN106217621A (en) * | 2016-08-25 | 2016-12-14 | 德清三明坩埚有限公司 | A kind of lower die structure of crucible forming machine |
| CN106423329A (en) * | 2016-09-17 | 2017-02-22 | 德阳市科瑞仪器设备厂 | Sample melting cup and processing method thereof |
| CN106493834A (en) * | 2016-11-16 | 2017-03-15 | 上海卡贝尼精密陶瓷有限公司 | The ceramic another part isostatic cool pressing base particular manufacturing craft of deep chamber top dome alms bowl class and using method |
| CN107244905A (en) * | 2017-06-05 | 2017-10-13 | 长兴华悦耐火材料厂 | A kind of preparation method of face coat high-temperature crucible |
| CN107311628A (en) * | 2017-06-05 | 2017-11-03 | 长兴华悦耐火材料厂 | A kind of high-temperature crucible of face coat |
| CN107805752A (en) * | 2017-11-03 | 2018-03-16 | 聊城鼎硕新材料有限公司 | One kind fusing rafifinal crucible and preparation method thereof |
| CN107805752B (en) * | 2017-11-03 | 2019-05-24 | 聊城鼎硕新材料有限公司 | A kind of fusing rafifinal crucible and preparation method thereof |
| CN108298961A (en) * | 2018-02-28 | 2018-07-20 | 清华大学 | Hemispherical product and its preparation method and application |
| CN108947541A (en) * | 2018-06-28 | 2018-12-07 | 东莞信柏结构陶瓷股份有限公司 | 3D ceramics rear cover and preparation method thereof |
| CN109333756A (en) * | 2018-11-29 | 2019-02-15 | 贵州大东风机械股份有限公司 | A kind of casting mould and method for polycrystalline crucible |
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Application publication date: 20120613 |