마그네슘 합금 표면의 지르코니아 분말 레이저 소결과정에서 조사 패턴이 접합계면 품질에 미치는 영향

The quality of the ceramic sintered coating on a metal surface through laser surface treatment is affected by thelaser irradiation pattern. Depending on the laser irradiation pattern, the amount of residual stress and heat applied oraccumulated on the surface increases or decreases, affecting the thickness attained in the ceramic sintering area.
When the heat energy accumulated in the sintering area is high, the ceramic and the metal alloy melt andsufficiently mix to form a homogeneous and thick bonding interface. In this study, the thermal energy accumulationin the region sintered with zirconia was controlled using four types of laser processing patterns. The thickness of thediffusion region is analyzed by laser-induced breakdown spectroscopy of Mg–ZrO2 generated by laser sinteringzirconia powder on the magnesium alloy surface. On the basis of the analysis of the Mg and Zr present in thesintered region through LIBS, the effect of the irradiation pattern on the sintering quality is confirmed by comparingand analyzing the heat and mass transfer tendency of the diffusion layer and the degree of diffusion according tothe irradiation pattern. The derived diffusion coefficients differed by up to 9.8 times for each laser scanning pattern.