... of deleterious,long contact fatigue life,high hardness,resistance to wear Silicon nitride(Si3N4)Key Properties1, High ... range2, High fracture toughness3, High hardness4, Outstanding wear resistance ,both impingement and frictional modes5, Good thermal shock ... conductivity (20% that of Alumina)4, Chemical inertness5, Resistance to molten metals6, Lonic electrical conduction7, Wear resistance8, ...