Preparation and Mechanical Properties of Y-Si-Al-O-N Glass

Abstract

A series of Y-Si-A1-O-N glasses, of which cation composition was same, were prepared b y melting Y₂O₃, Al₂O₃, SiO₂, Si₃N₄ or A1N at high temperature. Densities of the oxynitride glasses increased with nitrogen content up to 7 at% and leveled off. On the other hand, mechanical properties, such as hardness, Young's moduli and fracture toughness, of the glasses increased with nitrogen content in the glasses. The results of a FT-IR measurement suggested_that the microstructures of the oxynitride glasses changed with nitrog en content in the glasses. In the case of the same nitrogen and silicon content, mechanical properties changed with Y/A1 ratio in the glasses.