Preparation method of silicon nitride powder for solar grade silicon ingot
A silicon nitride powder and solar-grade technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of complex spraying process, high cost, limited promotion and use, etc., and achieve good demoulding effect and low cost Low, eliminate the effect of falling powder
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Embodiment 1
[0028] ① Take silicon powder, silicon nitride powder and ammonium chloride, and synthesize silicon nitride micropowder with purity ≥99.99%, iron content 10ppm, α phase content 92%, and median particle size 5μm by self-propagating method.
[0029] Wherein, the weight of silicon powder accounts for 40% of the total weight of silicon powder, silicon nitride powder and ammonium chloride, and the weight of silicon nitride powder accounts for 50% of the total weight of silicon powder, silicon nitride powder and ammonium chloride. The weight of ammonium chloride accounts for 10% of the total weight of silicon powder, silicon nitride powder and ammonium chloride;
[0030] The purity of the silicon powder is ≥99.99%, the particle size is 0.1-25 μm, and the median particle size is 3.5 μm;
[0031] The silicon nitride powder has a purity ≥ 99.99%, an alpha phase content ≥ 90%, a particle size of 0.1-50 μm, and a median particle size of 5 μm;
[0032] The purity of the ammonium chloride ...
Embodiment 2
[0040] ① Take silicon powder, silicon nitride powder and ammonium chloride, and synthesize silicon nitride micropowder with a purity of ≥99.99%, an iron content of 8ppm, an α-phase content of 90%, and a median particle size of 5.5μm by a self-propagating method.
[0041] Wherein, the weight of silicon powder accounts for 40% of the total weight of silicon powder, silicon nitride powder and ammonium chloride, and the weight of silicon nitride powder accounts for 50% of the total weight of silicon powder, silicon nitride powder and ammonium chloride. The weight of ammonium chloride accounts for 10% of the total weight of silicon powder, silicon nitride powder and ammonium chloride;
[0042] The purity of the silicon powder is ≥99.99%, the particle size is 0.1-25 μm, and the median particle size is 4 μm;
[0043] The silicon nitride powder has a purity ≥ 99.99%, an alpha phase content ≥ 90%, a particle size of 0.1-50 μm, and a median particle size of 5 μm;
[0044]The purity of ...
Embodiment 3
[0052] ① Take silicon powder, silicon nitride powder and additives, and synthesize silicon nitride micropowder with a purity of ≥99.99%, an iron content of 7ppm, an α phase content of 92%, and a median particle size of 5.2μm by a self-propagating method.
[0053] Among them, the weight of silicon powder accounts for 40% of the total weight of silicon powder, silicon nitride powder and additives, the weight of silicon nitride powder accounts for 50% of the total weight of silicon powder, silicon nitride powder and additives, and the weight of additives accounts for , 10% of the total weight of silicon nitride powder and additives;
[0054] The purity of the silicon powder is ≥99.99%, the particle size is 0.1-25 μm, and the median particle size is 4.5 μm;
[0055] The silicon nitride powder has a purity of ≥99.99%, an α-phase content of ≥90%, a particle size of 0.1-50 μm, and a median particle size of 6 μm;
[0056] The additive is a mixture of ammonium chloride and ammonium fl...
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