摘要
利用横流CO2激光器在钛合金表面制备出原位自生TiB体系陶瓷增强Co基复合涂层,以改善材料表面的综合性能。分析表明,涂层中存在β-Ti,γ-Co,TiB和TiB2陶瓷硬质颗粒相,以及Co2Ti硬质相。利用扫描电镜(SEM),电子探针微区分析(EPMA)对涂层微区组织结构进行研究。结果表明,涂层中原位生成的TiB2和TiB陶瓷颗粒相均匀分布在γ-Co基合金涂层中。随着Ti,B含量的增加,激光熔覆原位生成物的组织形态发生相应的变化,熔覆区组织由细小分散的片状和块状转变为柱状枝晶组织,取向规则,分布均匀。通过摩擦磨损实验对涂层的耐磨性进行评价,发现激光熔覆后涂层磨损量仅为基体材料的1/10左右,耐磨性得到显著改善。
In-situ synthesis of the system of TiB ceramic particle reinforced Co-base alloy composite coating has been produced on titanium alloy surface by CO2 flow transverse laser to improve the comprehensive properties of the material. Analysis shows that β-Ti,γ-Co,TiB and TiB2 ceramic phase and CO2Ti reinforcement phase lie in the coating. Studies of microstructure on the coating by scanning electronic microscope （SEM）,electron probe microzone analysis （EPMA） show that in-situ synthesis of TiB2 and TiB major ceramic phases disperse homogeneously in the γ-Co based alloy. With the increase of the content of Ti and B in cladding zone the form of reinforcement phase varies with chemical composition of the coating,and the small dispersed sheet and massive structure transform into column crystal structure with regularly oriented and uniform distribution. The wear resistance of the coating was evaluated with wear test. The wear loss of the coating is approximately 1/10 of the substrate material. Wear resistance of the composite coating is significantly improved.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2009年第12期3277-3281,共5页
Chinese Journal of Lasers
基金
国家自然科学基金(50704009
50601013)资助项目
关键词
激光技术
激光熔覆
原位生成
显微组织
耐磨性
laser technique
laser cladding
in-situ synthesis
microstructure
wear resistance
