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A preparing method of a polycrystalline sapphire transparent thin plate

A sapphire and transparent technology, applied in the growth of polycrystalline materials, chemical instruments and methods, crystal growth, etc., can solve the problems of difficult to prepare thin plates, low sintering density, and long production process, and achieve low cost and high sintering density , The effect of short production process

Inactive Publication Date: 2018-03-02
宁夏钜晶电子材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no matter cold isostatic pressing molding, dry pressing molding or injection molding, it is difficult to prepare thin sheets of tens of microns.
[0005] Patents CN102383187 and CN102162130A disclose the production of single crystal sapphire, including charging, chemical material, crystal seeding, crystal growth crown, crystal growth, finishing, cooling, furnace opening, cutting, truncation, ingot leveling, slicing, etc. Technology can form sapphire thin plate, the production process is long, the cost is high, the yield is low, and the production size is small, the maximum can only be 200-380mm
The method described in patent CN102765945A is a water-based casting method for alumina ceramic substrates, but the resulting product has low sintering density and poor light transmittance

Method used

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  • A preparing method of a polycrystalline sapphire transparent thin plate
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  • A preparing method of a polycrystalline sapphire transparent thin plate

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preparation example Construction

[0036] A preparation method for a polycrystalline sapphire transparent thin plate, comprising the steps of:

[0037] In the first step, clean alumina grinding balls are loaded into the nano sand mill, and the ratio of grinding balls to alumina powder is 5:1;

[0038] The second step is to weigh deionized water, dispersant, defoamer, and sintering aid in the nano sand mill according to the formula, weigh alumina powder according to the formula, and start the nano sand mill;

[0039] The third step is to add binder and plasticizer after 2 hours, continue grinding for 2 hours, and stop the nano grinder;

[0040] The fourth step is to transfer the ground slurry to a vacuum stirring and defoaming machine, vacuum defoaming for 0.5-1h, take a sample to test the viscosity, and stop defoaming when the viscosity reaches 2000-3000mPa·S;

[0041] The fifth step is to cast using a casting machine. According to the requirements of the polycrystalline sapphire green sheet, the casting thick...

Embodiment 1

[0054] Prepare polycrystalline sapphire blanks according to the following formula: 50% alumina powder, 1% dispersant DISPERBYK190, 2% polyvinyl alcohol and styrene-acrylic emulsion, 1% plasticizer Amgard TBEP, 1% defoamer tego foamex 840, 42.8% deionized water, 0.2% sintering aid nano magnesium oxide dispersion.

[0055] Prepared by the following process method:

[0056] In the first step, clean alumina grinding balls are loaded into the nano sand mill, and the ratio of grinding balls to alumina powder is 5:1;

[0057] The second step is to weigh deionized water, dispersant, defoamer, and sintering aid in the nano sand mill according to the formula, weigh alumina powder according to the formula, and start the nano sand mill;

[0058] The third step is to add binder and plasticizer after 2 hours, continue to grind for 2 hours and stop the machine;

[0059] The fourth step is to transfer the ground slurry to a vacuum stirring and defoaming machine, vacuum defoaming for 0.5-1h,...

Embodiment 2

[0068] Prepare polycrystalline sapphire blanks according to the following formula: add 55% alumina powder, add 2% dispersant DISPERBYK190, add polyvinyl alcohol 2%, styrene-acrylic emulsion 1%, water-based acrylic resin 1%, plasticizer Amgard TBEP1.5 %, add 1% of defoamer tego foamex 840, add 36% of deionized water, add 0.5% of nano-magnesium oxide dispersion sintering aid.

[0069] Prepared by the following process method:

[0070] In the first step, clean alumina grinding balls are loaded into the nano sand mill, and the ratio of grinding balls to alumina powder is 5:1;

[0071] The second step is to weigh deionized water, dispersant, defoamer, and sintering aid in the nano sand mill according to the formula, weigh alumina powder according to the formula, and start the nano sand mill;

[0072] The third step is to add binder and plasticizer after 2 hours, continue to grind for 2 hours and stop the machine;

[0073] The fourth step is to transfer the ground slurry to a vacu...

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Abstract

An environmentally friendly tape casting method of a polycrystalline sapphire transparent thin plate is provided. High-purity submicron-order spherical aluminum oxide is adopted as a main raw material, a sintering auxiliary agent is added, and polyvinyl alcohol, waterborne acrylic resin, styrene-acrylic emulsion, and the like are adopted as main adhesives, and deionized water is adopted in place of an organic solvent. The method overcomes problems, namely difficult production and processing, a low yield and a small manufacturing dimension in present sapphire production. The dimension of a polycrystalline sapphire thin plate blank manufactured by the method can be 450*450 mm that is an ultrahigh dimension, and most monocrystal sapphire products can be replaced. The waterborne adhesives areadopted and the water is adopted to replace the organic solvent in the method, thus reducing environment pollution.

Description

technical field [0001] The present invention relates to the field of sapphire preparation, more specifically, particularly to a method for preparing a polycrystalline sapphire transparent thin plate. Background technique [0002] Due to its excellent physical properties, sapphire is widely used in many hot fields such as microelectronics, optoelectronics, semiconductors, optical communications, information display, and national defense and military affairs. In 1959, Dr. Coble of GE developed transparent polycrystalline alumina (Polycrystalline Alumina, PCA), also known as polycrystalline sapphire, which opened a new chapter in the research and application of transparent ceramics. Compared with glass, polycrystalline sapphire has high strength, high hardness, high toughness and better resistance to surface damage. Compared with single crystal sapphire, the preparation temperature is lower, the production cycle is shorter, and it is easier to realize large size and structural...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B28/04C30B29/20
CPCC30B28/04C30B29/20
Inventor 李大海胡娟
Owner 宁夏钜晶电子材料科技有限公司
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