CN102581929A - Cake forming method of high-purity alumina powder - Google Patents
Cake forming method of high-purity alumina powder Download PDFInfo
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- CN102581929A CN102581929A CN2012100346250A CN201210034625A CN102581929A CN 102581929 A CN102581929 A CN 102581929A CN 2012100346250 A CN2012100346250 A CN 2012100346250A CN 201210034625 A CN201210034625 A CN 201210034625A CN 102581929 A CN102581929 A CN 102581929A
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Abstract
The invention relates to a cake forming method of high-purity alumina powder, belongs to the technical field of chemical machining forming methods, and in particular to an alumina cake forming method. The cake forming method comprises the steps of preforming, vacuum sealing, isostatic cool pressing, high-temperature sintering and the like. According to the invention, a mould made of a PP or tetra fluorine material is adopted, pollution caused by high-purity alumina by the traditional steel mould is avoided, a preformed cake obtained by through low-pressure pressing can ensure that the cake in the later-stage isostatic cool pressing does not easily deform like the original organic mould due to a certain strength, thus the cake with uniform material and enough density is obtained. The cake subjected to the isostatic cool pressing has unchangeable purity after being sintered, and has uniform shape and size and density of commonly reaching 3.0-3.7g/cm<3>. The loading quantity during producing and loading of a downstream manufacturer of sapphire can be effectively increased.
Description
Technical field
A kind of biscuit forming method of high purity aluminium oxide powder relates to chemical industry powder processing molding method technical field, is specifically related to a kind of forming method of aluminium oxide biscuit.
Background technology
In the at present domestic producer of doing the high purity aluminium oxide biscuit; Mostly with punching block dry-pressing straight forming or with polyurethane or rubber-like organic mold process cold isostatic compaction; More than in two kinds of methods or can cause friction to pollute and bring in the aluminium oxide; Or the shape after the isostatic cool pressing differs, and differs in size, and causes downstream as producing sapphire producer in the charge of the when filling with substance deficiency that waits less than normal.The present invention adopts the method for multistep molding, uses PP or tetrafluoro mould both to guarantee not polluted product, can make the uniform biscuit of size again.
Summary of the invention
The technical problem that the present invention will solve is: the uneven problem of friction pollution that the dry-pressing formed and organic mould cold isostatic compaction of existing punching block is caused or shape.
The technical solution adopted for the present invention to solve the technical problems is: use earlier and can not carry out low pressure preformed to the mould that high purity aluminium oxide pollutes, more preformed biscuit is carried out isostatic cool pressing compacting, final high temperature sintering after the vacuum seal.Concrete processing step is:
1.1 preformed: mix adding deionized water in the high purity alumina powder, put into the compacting of mould mesolow;
1.2 vacuum seal: with the vacuum seal in the vacuum packaging bag of packing into of preformed biscuit;
1.3 isostatic cool pressing: the biscuit of good seal is put into cold isostatic press together with vacuum packaging bag carry out isostatic cool pressing;
1.4 high temperature sintering: will pass through the biscuit that isostatic cool pressing suppresses and carry out high temperature sintering, and promptly get highdensity high purity aluminium oxide biscuit.
Preferably, the quality that adds deionized water described in the step 1.1 in the high purity alumina powder is 4～16% of an aluminium oxide quality, adds and need avoid in the deionized water mixed process polluting.
Preferably, the pressure of the compacting of low pressure described in the step 1.1 is 1～30Mpa.Adopt low press to suppress.
Preferably, mould described in the step 1.1 is PP or tetrafluoro mould.Mould to the design of biscuit quality requirement, adopts PP or tetrafluoro material according to the client, avoids the secondary pollution in the pressing process.
Preferably, the pressure of isostatic cool pressing described in the step 1.3 is 100～350Mpa, and the dwell time is 30～200s, so that make biscuit obtain sufficient density.
Preferably, the temperature of high temperature sintering described in the step 1.4 is controlled at 1400～1650 ℃, and sintering time is controlled at 4～8H.Biscuit density generally can reach 3.0～3.7g/cm behind the sintering
3
Compared with prior art; The beneficial effect that process of the present invention had is: what this technology adopted in the preformed process is that punching block polluted the material that high purity aluminium oxide causes before PP or tetrafluoro material mould had been avoided; The biscuit that preformed obtains through low pressure compacting is because easy deformation when having certain intensity can guarantee in the later stage isostatic cool pressing biscuit no longer as original organic mold; Thereby obtain the material homogeneous, the biscuit that density is enough.Biscuit after isostatic cool pressing purity behind sintering is constant, and geomery is even, and biscuit density generally can reach 3.0～3.7g/cm
3Can effectively increase the charge that downstream such as sapphire manufacturer produce when filling with substance.
The specific embodiment
Embodiment 1
Embodiment 1 is most preferred embodiment of the present invention, and concrete processing step is:
1, be 99.997% with 10kg purity, granularity (D50) is that the alumina powder jointed and 8kg deionized water about 2.0～3.0 μ m mixes.
2, the material of mixing is all packed in special PP or the tetrafluoro mould by the amount of every part of 100g, these the 100 parts moulds that install material are transferred to carried out the low pressure compacting in the low press, pressure is controlled at 20Mpa.
3, take out biscuit and be contained in respectively in the food vacuum packaging bag, in the vacuum machine, vacuumize sealing.
4, the biscuit of these good seals is transferred to again carried out isostatic cool pressing in the isostatic pressing machine, compacting pressure is 250Mpa, pressurize 170s.
5, again these 100 biscuits through the isostatic cool pressing compacting are carried out high temperature sintering, sintering temperature is controlled at 1550 ℃, and the time is controlled at 5H.Promptly obtain highdensity high purity aluminium oxide biscuit behind the sintering.
Through detecting, the high purity aluminium oxide biscuit density that goes out through method for preparing all reaches 3.7g/cm
3, satisfy quality requirement.
Embodiment 2
The concrete moulding process step of high purity aluminium oxide biscuit is:
1,10kg purity is reached 99.997%, granularity (D50) is that the alumina powder jointed and 0.4kg deionized water about 2.0～3.0 μ m mixes.
2, the material of mixing is all packed in special PP or the tetrafluoro mould by the amount of every part of 100g, these the 100 parts moulds that install material are transferred to carried out the low pressure compacting in the low press, pressure is controlled at 1Mpa.
3, take out biscuit and be contained in respectively in the food vacuum packaging bag, in the vacuum machine, vacuumize sealing.
4, the biscuit of these good seals is transferred to again carried out isostatic cool pressing in the isostatic pressing machine, compacting pressure is 110Mpa, pressurize 35s.
5, again these 100 biscuits through the isostatic cool pressing compacting are carried out high temperature sintering, sintering temperature is controlled at 1400 ℃, and the time is 8H.Promptly obtain highdensity high purity aluminium oxide biscuit behind the sintering.
Through detecting, the high purity aluminium oxide biscuit density that goes out through method for preparing all reaches 3.0g/cm
3, satisfy quality requirement.
Embodiment 3
The concrete moulding process step of high purity aluminium oxide biscuit is:
1,10kg purity is reached 99.997%, granularity (D50) is that the alumina powder jointed and 1.6kg deionized water about 2.0～3.0 μ m mixes.
2, the material of mixing is all packed in special PP or the tetrafluoro mould by the amount of every part of 100g, these the 100 parts moulds that install material are transferred to carried out the low pressure compacting in the low press, pressure is controlled at 30Mpa.
3, take out biscuit and be contained in respectively in the food vacuum packaging bag, in the vacuum machine, vacuumize sealing.
4, the biscuit of these good seals is transferred to again carried out isostatic cool pressing in the isostatic pressing machine, compacting pressure is 350Mpa, pressurize 200s.
5, again these 100 biscuits through the isostatic cool pressing compacting are carried out high temperature sintering, sintering temperature is controlled at 1650 ℃, and sintering time is 4H.Promptly obtain highdensity high purity aluminium oxide biscuit behind the sintering.
Through detecting, the high purity aluminium oxide biscuit density that goes out through method for preparing all reaches 3.7g/cm
3, satisfy quality requirement.
Embodiment 4
The concrete moulding process step of high purity aluminium oxide biscuit is:
1,10kg purity is reached 99.997%, granularity (D50) is that the alumina powder jointed and 1.0kg deionized water about 2.0～3.0 μ m mixes.
2, the material of mixing is all packed in special PP or the tetrafluoro mould by the amount of every part of 100g, these the 100 parts moulds that install material are transferred to carried out the low pressure compacting in the low press, pressure is controlled at 15Mpa.
3, take out biscuit and be contained in respectively in the food vacuum packaging bag, in the vacuum machine, vacuumize sealing.
4, the biscuit of these good seals is transferred to again carried out isostatic cool pressing in the isostatic pressing machine, compacting pressure is 115Mpa, pressurize 165s.
5, again these 100 biscuits through the isostatic cool pressing compacting are carried out high temperature sintering, sintering temperature is controlled at 1550 ℃, and the time is controlled at 7H, promptly obtains highdensity high purity aluminium oxide biscuit behind the sintering.
Through detecting, the high purity aluminium oxide biscuit density that goes out through method for preparing all reaches 3.7g/cm
3, satisfy quality requirement.
The above only is preferred embodiment of the present invention, is not to be the restriction of the present invention being made other form, and any professional and technical personnel of being familiar with possibly utilize the technology contents of above-mentioned announcement to change or be modified as the equivalent embodiment of equivalent variations.But everyly do not break away from technical scheme content of the present invention, to any simple modification, equivalent variations and remodeling that above embodiment did, still belong to the protection domain of technical scheme of the present invention according to technical spirit of the present invention.
Claims (7)
1. the biscuit forming method of a high purity aluminium oxide powder is characterized in that, comprises following processing step:
1.1 preformed: mix adding deionized water in the high purity alumina powder, put into the compacting of mould mesolow;
1.2 vacuum seal: with the vacuum seal in the vacuum packaging bag of packing into of preformed biscuit;
1.3 isostatic cool pressing: the biscuit of good seal is put into cold isostatic press together with vacuum packaging bag carry out isostatic cool pressing;
1.4 high temperature sintering: will pass through the biscuit that isostatic cool pressing suppresses and carry out high temperature sintering, and promptly get highdensity high purity aluminium oxide biscuit.
2. the biscuit forming method of high purity aluminium oxide powder according to claim 1 is characterized in that: the quality that adds deionized water described in the step 1.1 in the high purity alumina powder is 4～16% of an aluminium oxide quality.
3. the biscuit forming method of high purity aluminium oxide powder according to claim 1 is characterized in that: the pressure of the compacting of low pressure described in the step 1.1 is 1～30Mpa.
4. the biscuit forming method of high purity aluminium oxide powder according to claim 1 is characterized in that: mould described in the step 1.1 is PP or tetrafluoro mould.
5. the biscuit forming method of high purity aluminium oxide powder according to claim 1 is characterized in that: the pressure of isostatic cool pressing described in the step 1.3 is 100～350Mpa, and the dwell time is 30～200s.
6. the biscuit forming method of high purity aluminium oxide powder according to claim 1 is characterized in that: the temperature of high temperature sintering described in the step 1.4 is controlled at 1400～1650 ℃, and sintering time is controlled at 4～8H.
7. the biscuit forming method of high purity aluminium oxide powder according to claim 1 is characterized in that: said high purity alumina powder refers to that purity reaches 99.997%, and granularity D50 is the high purity aluminium oxide of 2.0～6.0 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210034625.0A CN102581929B (en) | 2012-02-16 | 2012-02-16 | Cake forming method of high-purity alumina powder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210034625.0A CN102581929B (en) | 2012-02-16 | 2012-02-16 | Cake forming method of high-purity alumina powder |
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| CN102581929A true CN102581929A (en) | 2012-07-18 |
| CN102581929B CN102581929B (en) | 2014-03-05 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104649653A (en) * | 2015-01-05 | 2015-05-27 | 杭州大和热磁电子有限公司 | High-purity alumina precision ceramic part for semiconductor equipment |
| CN106182342A (en) * | 2016-07-08 | 2016-12-07 | 苏州珂玛材料技术有限公司 | A kind of moulding process of large-scale high-purity alumina ceramic part |
| CN107190310A (en) * | 2016-03-15 | 2017-09-22 | 李刚 | A kind of monocrystalline combination raw materials moulding process design of high loading density |
| CN107337223A (en) * | 2017-08-04 | 2017-11-10 | 大连交通大学 | The water quenching preparation technology of high purity aluminium oxide particle |
| CN114043763A (en) * | 2021-09-17 | 2022-02-15 | 大同新成新材料股份有限公司 | Forming method of isostatic pressing small graphite block |
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| CN107337223A (en) * | 2017-08-04 | 2017-11-10 | 大连交通大学 | The water quenching preparation technology of high purity aluminium oxide particle |
| CN107337223B (en) * | 2017-08-04 | 2019-04-30 | 大连交通大学 | The water quenching preparation process of high purity aluminium oxide particle |
| CN114043763A (en) * | 2021-09-17 | 2022-02-15 | 大同新成新材料股份有限公司 | Forming method of isostatic pressing small graphite block |
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| CN102581929B (en) | 2014-03-05 |
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Effective date of registration: 20181127 Address after: 028000 No. 1793 Huolinhe Street, Horqin District, Tongliao City, Inner Mongolia Autonomous Region (First Committee of Ximen Office) Patentee after: Jingxin Crystal (Inner Mongolia) Technology Co., Ltd. Address before: 255200 Jingxin Road, Badou Town, Boshan District, Zibo City, Shandong Province Patentee before: Shandong Gemsung Technology Co., Ltd. |