CN102581929B - Cake forming method of high-purity alumina powder - Google Patents
Cake forming method of high-purity alumina powder Download PDFInfo
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- CN102581929B CN102581929B CN201210034625.0A CN201210034625A CN102581929B CN 102581929 B CN102581929 B CN 102581929B CN 201210034625 A CN201210034625 A CN 201210034625A CN 102581929 B CN102581929 B CN 102581929B
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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 cake forming method for high-purity alumina powder, relates to chemical industry raw material processing forming method technical field, is specifically related to a kind of forming method of aluminium oxide biscuit.
Background technology
At present in domestic producer of doing high purity aluminium oxide biscuit, mainly with punching block dry-pressing straight forming or with polyurethane or rubber-like organic mold, pass through cold isostatic compaction greatly, in above two kinds of methods or can cause friction to pollute and bring in aluminium oxide, or the shape after isostatic cool pressing differs, differ in size, cause downstream as produced sapphire producer in the charge deficiency that waits less than normal of when filling with substance.The present invention adopts the method for multistep molding, uses PP or tetrafluoro mould both to guarantee not polluted product, can make again the biscuit of size uniform.
Summary of the invention
The technical problem to be solved in the present invention is: the uneven problem of the friction pollution that existing punching block is dry-pressing formed and organic mould cold isostatic compaction causes or shape.
The technical solution adopted for the present invention to solve the technical problems is: first use the mould that can not pollute high purity aluminium oxide to carry out low pressure preformed, more preformed biscuit is carried out to isostatic cool pressing compacting, final high temperature sintering after vacuum seal.Concrete technology step is:
1.1 preformed: will add deionized water to mix in high purity alumina powder, put into the compacting of mould mesolow;
1.2 vacuum seals: pack preformed biscuit in vacuum packaging bag vacuum seal;
1.3 isostatic cool pressings: the biscuit of good seal is put into cold isostatic press together with vacuum packaging bag and carry out isostatic cool pressing;
1.4 high temperature sinterings: the biscuit suppressing through isostatic cool pressing is carried out to high temperature sintering, obtain highdensity high purity aluminium oxide biscuit.
Preferably, the quality that adds deionized water described in step 1.1 in high purity alumina powder is quality of alumina 4～16%, adds in deionized water mixed process and needs to avoid to pollute.
Preferably, the pressure of the compacting of low pressure described in step 1.1 is 1～30Mpa.Adopt low press to suppress.
Preferably, mould described in step 1.1 is PP or tetrafluoro mould.Mould to the design of biscuit quality requirement, adopts PP or tetrafluoro material according to client, avoids the secondary pollution in pressing process.
Preferably, the pressure of isostatic cool pressing described in step 1.3 is 100～350Mpa, and the dwell time is 30～200s, to make biscuit obtain sufficient density.
Preferably, the temperature of high temperature sintering described in step 1.4 is controlled at 1400～1650 ℃, and sintering time is controlled at 4～8H.After sintering, biscuit density generally can reach 3.0～3.7g/cm
3.
Compared with prior art, the beneficial effect that process of the present invention has is: what this technique adopted in preformed process is that the material that before PP or tetrafluoro material mould have been avoided, punching block causes high purity aluminium oxide is polluted, the biscuit that preformed obtains through low pressure compacting owing to having certain intensity can guarantee that in later stage isostatic cool pressing, biscuit is no longer as original organic mold easy distortion, thereby obtain material homogeneous, the biscuit that density is enough.Biscuit after isostatic cool pressing purity after sintering is constant, and geomery is even, and biscuit density generally can reach 3.0～3.7g/cm
3.Can effectively increase the charge that downstream produces when filling with substance as sapphire manufacturer.
The specific embodiment
Embodiment 1
Embodiment 1 is most preferred embodiment of the present invention, and concrete technology step is:
1, by 10kg purity, be 99.997%, granularity (D50) is that the alumina powder jointed and 8kg deionized water of 2.0～3.0 μ m left and right mixes.
2, the material mixing is all packed in special PP or tetrafluoro mould by the amount of every part of 100g, these the 100 parts moulds that install material are transferred in low press and carried out low pressure compacting, pressure is controlled at 20Mpa.
3, take out biscuit and be contained in respectively in food vacuum packaging bag, in vacuum machine, vacuumize sealing.
4, the biscuit of these good seals is transferred in isostatic pressing machine again and carried out isostatic cool pressing, compacting pressure is 250Mpa, pressurize 170s.
5, again these 100 biscuits through isostatic cool pressing compacting are carried out to high temperature sintering, sintering temperature is controlled at 1550 ℃, and the time is controlled at 5H.After sintering, obtain highdensity high purity aluminium oxide biscuit.
After testing, the high purity aluminium oxide biscuit density of preparing by said method all reaches 3.7g/cm
3, meet quality requirement.
Embodiment 2
The concrete moulding process step of high purity aluminium oxide biscuit is:
1,10kg purity is reached to 99.997%, granularity (D50) is that the alumina powder jointed and 0.4kg deionized water of 2.0～3.0 μ m left and right mixes.
2, the material mixing is all packed in special PP or tetrafluoro mould by the amount of every part of 100g, these the 100 parts moulds that install material are transferred in low press and carried out low pressure compacting, pressure is controlled at 1Mpa.
3, take out biscuit and be contained in respectively in food vacuum packaging bag, in vacuum machine, vacuumize sealing.
4, the biscuit of these good seals is transferred in isostatic pressing machine again and carried out isostatic cool pressing, compacting pressure is 110Mpa, pressurize 35s.
5, again these 100 biscuits through isostatic cool pressing compacting are carried out to high temperature sintering, sintering temperature is controlled at 1400 ℃, and the time is 8H.After sintering, obtain highdensity high purity aluminium oxide biscuit.
After testing, the high purity aluminium oxide biscuit density of preparing by said method all reaches 3.0g/cm
3, meet quality requirement.
Embodiment 3
The concrete moulding process step of high purity aluminium oxide biscuit is:
1,10kg purity is reached to 99.997%, granularity (D50) is that the alumina powder jointed and 1.6kg deionized water of 2.0～3.0 μ m left and right mixes.
2, the material mixing is all packed in special PP or tetrafluoro mould by the amount of every part of 100g, these the 100 parts moulds that install material are transferred in low press and carried out low pressure compacting, pressure is controlled at 30Mpa.
3, take out biscuit and be contained in respectively in food vacuum packaging bag, in vacuum machine, vacuumize sealing.
4, the biscuit of these good seals is transferred in isostatic pressing machine again and carried out isostatic cool pressing, compacting pressure is 350Mpa, pressurize 200s.
5, again these 100 biscuits through isostatic cool pressing compacting are carried out to high temperature sintering, sintering temperature is controlled at 1650 ℃, and sintering time is 4H.After sintering, obtain highdensity high purity aluminium oxide biscuit.
After testing, the high purity aluminium oxide biscuit density of preparing by said method all reaches 3.7g/cm
3, meet quality requirement.
Embodiment 4
The concrete moulding process step of high purity aluminium oxide biscuit is:
1,10kg purity is reached to 99.997%, granularity (D50) is that the alumina powder jointed and 1.0kg deionized water of 2.0～3.0 μ m left and right mixes.
2, the material mixing is all packed in special PP or tetrafluoro mould by the amount of every part of 100g, these the 100 parts moulds that install material are transferred in low press and carried out low pressure compacting, pressure is controlled at 15Mpa.
3, take out biscuit and be contained in respectively in food vacuum packaging bag, in vacuum machine, vacuumize sealing.
4, the biscuit of these good seals is transferred in isostatic pressing machine again and carried out isostatic cool pressing, compacting pressure is 115Mpa, pressurize 165s.
5, again these 100 biscuits through isostatic cool pressing compacting are carried out to high temperature sintering, sintering temperature is controlled at 1550 ℃, and the time is controlled at 7H, obtains highdensity high purity aluminium oxide biscuit after sintering.
After testing, the high purity aluminium oxide biscuit density of preparing by said method all reaches 3.7g/cm
3, meet quality requirement.
The above, be only preferred embodiment of the present invention, is not the present invention to be done to the restriction of other form, and any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solution of the present invention content that do not depart from, any simple modification, equivalent variations and the remodeling above embodiment done according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.
Claims (3)
1. a cake forming method for high-purity alumina powder, is characterized in that, comprises following processing step:
1.1 preformed: will add deionized water to mix in high purity alumina powder, put into the compacting of mould mesolow;
1.2 vacuum seals: pack preformed biscuit in vacuum packaging bag vacuum seal;
1.3 isostatic cool pressings: the biscuit of good seal is put into cold isostatic press together with vacuum packaging bag and carry out isostatic cool pressing;
1.4 high temperature sinterings: the biscuit suppressing through isostatic cool pressing is carried out to high temperature sintering, obtain highdensity high purity aluminium oxide biscuit;
The quality that adds deionized water described in step 1.1 in high purity alumina powder is quality of alumina 4～16%;
The pressure of the compacting of low pressure described in step 1.1 is 1～30Mpa;
Mould described in step 1.1 is PP or tetrafluoro mould;
Described 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.
2. the cake forming method of high-purity alumina powder according to claim 1, is characterized in that: the pressure of isostatic cool pressing described in step 1.3 is 100～350Mpa, and the dwell time is 30～200s.
3. the cake forming method of high-purity alumina powder according to claim 1, is characterized in that: the temperature of high temperature sintering described in step 1.4 is controlled at 1400～1650 ℃, and sintering time is controlled at 4～8H.
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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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| CN201210034625.0A CN102581929B (en) | 2012-02-16 | 2012-02-16 | Cake forming method of high-purity alumina powder |
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| CN102581929A CN102581929A (en) | 2012-07-18 |
| CN102581929B true CN102581929B (en) | 2014-03-05 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104649653B (en) * | 2015-01-05 | 2016-11-23 | 杭州大和热磁电子有限公司 | A kind of semiconductor equipment high purity aluminium oxide high technology ceramics 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 |
| 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 |
| 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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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. |