YPSZ等离子涂层激光重熔组织性能

Microstructure and properties of laser remelt YPSZ coatings

摘要: 采用CO₂激光焊接试验系统对YPSZ(8%Y₂O₃-ZrO₂)等离子涂层进行了激光重熔,并对涂层进行了微观组织与性能分析。结果表明,经激光重熔后YPSZ涂层气孔和微裂纹明显减少,组织均匀致密,表面粗糙度低,强度和韧度提高。涂层硬度的变化与重熔过程中涂层相成分转变有关,经激光重熔处理后YPSZ涂层中主要相成分为t-ZrO₂和少量的c-ZrO₂,t-ZrO₂具有较高的强度和韧度是改善涂层的表面力学性能的主要因素。

Abstract: CO₂ laser system was used to remelt YPSZ (yttria partially stabilized zirconia, 8% Y₂O₃ -ZrO₂) coatings.The microstructure, phases and microhardness of the coatings were studied. Results show that after rapid melting and solidification by laser beam, the porosity and the crack in the YPSZ coatings are decreased, meanwhile the strength and toughness of YPSZ coatings are increased.This change is due to the variation of phases. The YPSZ coatings treated by laser remelting is composed of lots tetragonal and few cubic phases.Tetragonal phase is the main reason to improve the mechanical properties of coating surface.