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Preparation process of composite ceramic coating release agent

A preparation process and technology of composite ceramics, applied in the directions of coating, crystal growth, polycrystalline material growth, etc., can solve the problems of lower yield of central silicon, insufficient photoelectric conversion efficiency, difficulty in demoulding, etc., to improve first-class products. efficiency, improve the anti-seepage effect, and control the production cost

Pending Publication Date: 2022-05-13
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the current problem is that after the preparation and smelting of polysilicon undergoes the gradually large-scale technology route of G5, G6, and G7 to obtain as many central silicon squares and as high as possible photoelectric conversion efficiency, the central silicon square prepared by the G7 process The yield is also only 51%, and the photoelectric conversion efficiency is less than 20%.
Therefore, it is difficult to release the mold after cooling down, which leads to a decrease in the yield of the central silicon square.

Method used

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  • Preparation process of composite ceramic coating release agent
  • Preparation process of composite ceramic coating release agent
  • Preparation process of composite ceramic coating release agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take D50=1.7μm single-phase Si 2 N 2 O powder, single-phase β-Si with D50=1.4μm 3 N 4 Powder, mass fraction is 5% PVA solution, counted by weight, 5 parts of β-Si 3 N 4Powder, 5 parts of Si 2 N 2 The O powder was put into a container made of polyethylene, and then 90 parts of the PVA solution was added.

[0030] Put silicon nitride balls into the container containing the mixed powder and polyvinyl alcohol solution and cover it tightly, place it in a planetary ball mill for 3 minutes to make it uniform, and obtain a compound slurry. The slurry was spray-coated on the inner surface of a quartz crucible preheated to 90° C., with a porosity of 15%, a square bottom surface of 100 mm, and a depth of 100 mm. Put the crucible coated with the composite coating into a drying oven, and dry it at 120°C for 2 hours. Put the dried crucible into the muffle furnace and keep it warm at 800°C for 2 hours, and the inner surface of the crucible will obtain Si 2 N 2 O / β-Si 3 N 4...

Embodiment 2

[0033] A kind of Si for silicon ingot demoulding 2 N 2 O / β-Si 3 N 4 The preparation method of composite coating, comprises the steps:

[0034] Take D50=1.2μm single-phase Si 2 N 2 O powder, single-phase β-Si with D50=2μm 3 N 4 Powder, mass fraction is 5% PVA solution, counted by weight, 5 parts of β-Si 3 N 4 Powder, 10 parts of Si 2 N 2 O powder was put into a container made of polyethylene, and then 85 parts of PVA solution was added.

[0035] Put silicon nitride balls into the container containing the mixed powder and polyvinyl alcohol solution and cover it tightly, place it in a planetary ball mill for 5 minutes to make it uniform, and obtain a compound slurry. The slurry was spray-coated on the inner surface of a quartz crucible preheated to 90° C., with a porosity of 15%, a square bottom surface of 100 mm, and a depth of 100 mm. Put the crucible coated with the composite coating into a drying oven and dry it at 120°C for 3 hours. Put the dried crucible into t...

Embodiment 3

[0038] A kind of Si for silicon ingot demoulding 2 N 2 O / β-Si 3 N 4 The preparation method of composite coating, comprises the steps:

[0039] Take D50=1.4μm single-phase Si 2 N 2 O powder, single-phase β-Si with D50=1.6μm 3 N 4 Powder, mass fraction is 5% PVA solution, counted by weight, 4 parts of β-Si 3 N 4 Powder, 8 parts of Si 2 N 2 O powder was put into a container made of polyethylene, and then 88 parts of PVA solution was added.

[0040] Put silicon nitride balls into the container containing the mixed powder and polyvinyl alcohol solution and cover it tightly, place it in a planetary ball mill for 4 minutes to make it uniform, and obtain a compound slurry. The slurry was spray-coated on the inner surface of a quartz crucible preheated to 90° C., with a porosity of 15%, a square bottom surface of 100 mm, and a depth of 100 mm. Put the crucible coated with the composite coating into a drying oven, and dry it at 120°C for 5 hours. Put the dried crucible into...

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Abstract

The invention discloses a composite ceramic coating release agent for silicon ingot demolding in the preparation process of solar grade polycrystalline silicon. The composite ceramic coating release agent is prepared from silicon oxynitride, beta silicon nitride, polyvinyl alcohol and water. The thermal and mechanical properties of Si2N2O are similar to those of a Si3N4 material, but the oxidation resistance, thermal shock resistance and chemical stability of Si2N2O are superior to those of the Si3N4 material. The Si melt shows super-hydrophobic property to the Si2N2O material, and the Si melt and the Si2N2O material do not have chemical reaction, so that the condition of quality reduction caused by adhesion and impurity diffusion of the Si cast ingot can be effectively reduced, and the purpose of improving the first-grade product rate of polycrystalline Si is achieved; the free energy of the beta-Si3N4 is lower than that of the alpha phase, the preparation difficulty is low, and the cost for preparing the same amount of Si3N4 powder and the alpha phase is 3-5 times that of the beta phase, so that the preparation cost can be effectively controlled by using the beta-Si3N4-based coating. In conclusion, the Si2N2O / beta-Si3N4 composite ceramic coating is a demolding coating which is superior to traditional Si3N4 in thermodynamic property and wettability and is low in cost.

Description

technical field [0001] The invention relates to the field of photovoltaic silicon ingot preparation, in particular to the improvement of a release agent. Background technique [0002] As a clean energy, solar energy has become the most concerned domestic and foreign research hotspot in the field of new energy. At present, the mainstream solar cell technology in the industry mostly uses polycrystalline Si wafers as photoelectric conversion materials. The quality of polycrystalline Si wafers has a decisive impact on the performance, life and cost of battery modules. Si materials for solar cells are mainly produced by directional solidification process. The process has extremely strict requirements on the crucible, which requires the crucible to meet high temperature resistance, no pollution or less pollution, good high temperature deformation resistance, small thermal expansion coefficient, good thermal shock stability; high bulk density and anti-bending and compression Phys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/00C30B29/06C30B28/06
CPCC30B29/06C30B28/06C03C17/006C03C2217/29C03C2218/112
Inventor 贺刚邓书香杨增朝李江涛
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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