TRIAL FABRICATION AND PRELIMINARY CHARACTERIZATION OF MGO-CENTER-DOT-AL2O3 COATING

Magnesia-alumina spinel (MgO . Al2O3) coated on 316SS substrate with a buffer layer of 410SS by the plasma spraying method was examined in h ardness and thermal shock resistivity to investigate the optimum condi tions for preparation. Among the conditions investigated, the specimen with a 50 mu m thick MgO . Al2O3 coating by the atmospheric spraying method and a 150 mu m thick 410SS undercoating by the vacuum spraying method using particles of 10-45 mu m was the best in thermal shock res istivity. This result was consistent with the metallographical observa tions.