Molds for polycrystal silicon ingot casting, and nitriding silicon powder for that mold release material, nitriding silicon powder content slurry for that mold release layer and mold release material for its casting

摘要

It is low, at cost it is superior in adhesiveness of the mold, the case where the mold release it does the silicon ingot which solidifies holding down the occurrence of being lacking and breaking, the silicon ingot whose quality is high the molds for polycrystal silicon ingot casting, and the nitriding silicon powder for that mold release material which can obtain at high yield rate, it offers the nitriding silicon powder content slurry for that mold release layer and the mold release material for its casting. It is the nitriding silicon powder for the mold release material of the molds for polycrystal silicon ingot casting which feature that it is 95% or more in the area ratio which ratio of the granular crystal primary particle which the inside of the powder disperses singly calculated from picture analysis of the SEM image.