Material having a multilayer architecture and intended for being contacted with liquid silicon

摘要

The present invention relates to novel materials intended for being contacted with liquid silicon and having a multilayer architecture, the intermediate layer of which is formed by a silicon carbide matrix containing at least one carbon nodule. The invention also relates to the method for preparing said materials.

主权项

1. A material part, possessing a multilayer architecture formed of at least:
one support layer based on carbon that possesses an open volume porosity varying from 25% to 40% and consists of graphite grains having a micrometric size of 1 to 10 μm, a surface layer made of silicon carbide, an intermediate layer inserted between said support and surface layers, wherein said intermediate layer is formed of a matrix of silicon carbide containing at least 30% by volume of a carbon nodule or nodules, with the volume fraction of silicon carbide forming said intermediate layer being equal to the volume fraction of the initial porosity of the graphite forming the support layer based on carbon, multiplied by at least 1.2, the volume fraction of silicon carbide forming the intermediate layer varying from 45% to 70%, and the surface and intermediate layers possessing less than 5% by volume of solid silicon.