Sialon is a reacted mixture of SiN, SiO2, Al2O3 and AlN
Many of the properties of Boron Nitride vary significantly with the grade of the material.
AlN was first synthesized in 1877, but it was not until the middle of the 1980s that its potential for application in microelectronics was realized due to its relative high thermal conductivity for an electrical insulating ceramic (70–210 W·m−1·K−1 for polycrystalline material, and as high as 285 W·m−1·K−1 for single crystals).
Key properties of this material include thermal shock resistance as well as fracture toughness. These coupled with high temperature strength and wear resistance even under oxidizing conditions make silicon nitride an excellent candidate for IC engine and turbine applications.