MEHTOD FOR DETERMINING SILICA POWDER SUITABLE FOR PRODUCING SILICA GLASS CRUCIBLE FOR PULLING UP SILICON SINGLE CRYSTAL

摘要

PROBLEM TO BE SOLVED: To provide a method for determining silica powder suitable for forming a bubble-free layer in a silica glass crucible for pulling up a silicon single crystal.SOLUTION: This invention relates to a method for determining silica powder suitable for forming a bubble-free layer in a silica glass crucible for pulling up a silicon single crystal, wherein the method includes: a step of measuring gaps among silica particles in the silica powder; a step of melting the silica powder; a step of measuring gaps in a silica block obtained by cooling and hardening the molten silica; and a step of determining whether silica powder is a suitable one or not based on the gaps among the silica particles and the gaps in the silica block.