Ablation Experiments of Heat-Resisting Ceramics SiC and Si₃N₄ in High-Temperature Ar Plasma Free Jets

Abstract

Experimental measurements on ablation properties of fine ceramics SiC and Si₃N₄ are performed in an atmospheric high-temperature argon plasma free jet The heat of ablation is measured for the heat flux of 1.2∼2.6×10⁴ kW/m². It is about 2×10⁴ kJ/kg for Si₃N₄ and 5-8×10⁴ kJ/kg for SiC. In addition, features of the ablated surface of the materials are observed with the aid of an electron microscope, and the mechanism of the ablation is discussed on the basis of it.