Strongly adhesive silicium nitride release layer

摘要

A slurry sizing agent creates a durable separation layer that is permanently attached to a substrate e.g. a crucible for the production of silicon ingots. The sizing agent is a suspension of solid particles representing 67-95 % Wt. silicon nitride and 5-33 % Wt. of an SiO2-based high-temperature binding agent. The SiO2-based high-temperature binding agent is derived from an SiO2 precursor pre-treated at a temperature in the range 300-1300[deg] C. Further claimed is a crucible with a commensurate surface coating and an associated process for its manufacture.