Effect of ZrO 2 Coating on the Properties of Porous Silicon Nitride

The powder of 3molY2O3-ZrO2 as the coating material sprayed on the surface of porous silicon nitride which porosity is more than 50% by Plasma Sprayed. The microstructure of the coating and the matrix was analysised. The performance change of porosity, strength and insulation, before and after spray, were researched.