Claim: Sialon are ceramics made with silicon nitride, a material made by heating powdered silicon between 1300 °C and 1400 °C in a nitrogen environment.
Evidence: SiAlONs are produced by first combining a mixture of raw materials including silicon nitride, alumina, aluminium nitride, silica and the oxide of a rare-earth element such as yttrium. The material will be prepared by heating powdered silicon between 1300 °C and 1400 °C in a nitrogen environment: