Nano Si3N4 composites with improved tribological properties

Nano Si3N4 composites with tailored microstructure were developed using fine beta-Si3N4 powders. Their wear behaviour was investigated. Whereas pure Si3N4 Composites showed improved wear behaviour under dry rolling conditions with slip, TiN-reinforced nano Si3N4 composites generate a self-lubricating behaviour under dry sliding conditions. After chemical treatment with hydrogen sulphide, the friction coefficient and wear rate was found to be significantly decreased under dry sliding conditions. Additionally, the new composites possess higher fracture toughness than the pure nano Si3N4 materials. Copyright (C) 2009 John Wiley & Sons, Ltd.