Are there any **standards** for determining the purity of that silicon powder as well as the moisture content in it?
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Are there any **standards** for determining the purity of that silicon powder as well as the moisture content in it? Can purity be determined by measuring the total impurity content and then subtracting those impurities to find the purity? Or directly add hydrofluoric acid to volatilize silicon. . . Can the moisture content be determined by measuring the difference in mass after heating?
“That silicon powder” — what is it?
Is it referring to the powder of metallic silicon, or metallurgical silicon? This type of metallurgical silicon powder, with a particle size of around 80–240 mesh, is used in the production of polysilicon. The standard for testing metal silicon is the \"Industrial Silicon Standard\". For polysilicon, due to its very high purity of 6N, the content of impurities (such as P, B, O, N, and metals) is measured; the silicon content is then determined by subtracting the amount of these impurities. Regarding water content, metal silicon and polysilicon are not key indicators; generally, weight measurement after drying is used.
What was said upstairs is very comprehensive; our company does the same thing
Reply to 3# Egret Shoal: When preparing silicon powder, there are sometimes undissolved black particles in the crucible. Are they carbon particles? Will it have an impact on the test results?
Reply to 5# shi2909: I’m not sure what tests you need to conduct? The black particles indicate that your sample has not been completely digested, which will affect the measurements.