Ablation Properties of ZrO₂-MgO and Mo Nozzle Produced by Plasma Spray Forming

Abstract

ZrO2-MgO and Mo powder coating on a substrate material prepared by an high temperature plasma spraying forming (PSF) for lease-shaped engine nozzles, and its total thickness is about 300 μ m. The surface coating changes of microstructure were investigated by a small solid rocket motor static ablation and the results were discussed for preliminary ions after ablation. The results show that the plasma spraying throat coat is a layer structure and the pore consist in micro-gap between layer and layer.That throat coating erosion is so severe were found after the ablation test , which is because of the metal oxide particles caused by mechanical denudation and high temperature thermal chemical ablation.Whereas the coating interface have no significant cracks after erosion, so that the composite coating of ZrO2-MgO and Mo wear good erosion performance.