Abstract
In this study, in order to investigate the properties of silicon carbide (SiC) ablation, observation of SiC ablation was made in nitrogen plasma freejet using video camera, and spectroscopic measurements of radiation from ablating SiC surface. The surface temperatures near the top of the test pieces were estimated by fitting Planck's law of radiation to the continuum of the experimental spectra. The results were compared with those in air plasma freejets. It was found that the top of the test piece changed to a sharp shape by ablation in nitrogen plasma freejet, while changed to a round shape in air plasma freejet. Si, Cu atomic lines and CN molecular bands were overlapped on the strong continuum in both the plasma freejet, and the surface temperature of SiC was about 2,600K in nitrogen plasma freejet, but 3,600K in air plasma freej'et
