Silicon nitride coating of crucible for polycrystalline silicon ingot and preparation method thereof
A silicon nitride coating and polysilicon technology, applied in chemical instruments and methods, polycrystalline material growth, crystal growth, etc., can solve the problems affecting the quality of natural drying of crucible coatings, production quality is difficult to guarantee, energy consumption and production costs Advanced problems, to achieve the effect suitable for large-scale production, high yield and less material loss
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[0035] A silicon nitride coating of a crucible for polysilicon ingots, the mass percentages of the components of the silicon nitride coating are: 40% silicon nitride powder, 20% microcrystalline cellulose, and 9% silica sol , 1% ceramic binder, and the rest is 30% water, and the water is selected from high-purity water with a resistivity greater than 12 megohms.
[0036] A method for preparing a silicon nitride coating on a crucible for polysilicon ingots, the steps of which are as follows:
[0037] (1) Preparation of wet material: Mix silicon nitride powder, water, microcrystalline cellulose, silica sol and ceramic binder according to the proportion and stir it with a mixer to form material A. Material A is a wet and uniform material. After mixing, it is made into wet granules by a granulator. When preparing the wet material, it is required to have moisturizing ability to increase the fluidity of subsequent extrusion and the plasticity during spheronization;
[0038] (2) Gra...
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