Process Optimization of Thermal-sprayed STS316 Coating

J. Ocean Eng. Technol. 2010;24(1):161-165.

Kim Kyun-Tak,Kim Yeong-Sik

School of Mechanical Engineering Pukyung National University,School of Mechanical Engineering Pukyung National University

STS316 용사코팅의 최적 공정 설계

김균택,김영식

부경대학교 기계공학부,부경대학교 기계공학부

Keywords: Thermal spray process, STS316, Analysis of variance, Process optimization

핵심용어: 용사법, 316 스테인리스 강, 분산분석, 공정 최적화

Abstract

In the present study, process optimization for thermal-sprayed STS316 coating has been performed using $L_9(3^4)$ orthogonal array and analysis of variance (ANOVA). STS316 coatings were fabricated by flame spray process on steel substrate, and the hardness test and microstructure observation of the coatings were studied. The results of hardness test were analyzed by ANOVA. The ANOVA results showed that the spray distance had the greatest effect on hardness of the coating, on the other hands, the effects of oxygen gas flow and spray distance were ignorable. From these results, the optimal combination of the flame spray parameters could be derived, and confirmation experiment was carried out to verify these derived results. The calculated hardness of the coatings by ANOVA was found to approximately close to that of confirmation experimental result. Thus, it was considered that design of experiments using orthogonal array and ANOVA was effective for process optimization of thermal-sprayed STS316 coating.