New Synthesis Routes for Sialon and Sialon Ceramics

摘要

Synthesis of sialons by reacting clay, silicon, and aluminium nitride with nitrogen has been shown to take place at low temperatures (1150℃). The addition of cations known to stabilise a-sialon (e.g. lithium, calcium) allows formation of α-sialons at relatively low temperatures. The use of fluorides promotes the reaction and in particular the use of sodium fluoride allows the formation of sodium α-sialon. This process employs inexpensive raw materials, and was intended for the design of advanced refractory materials but may have wider application.