激光熔覆TiN金属陶瓷涂层的微观组织  

Microstructure of Laser Clad TiN Cermet Layers

作　　者：孙荣禄[1] 王成扬[1] 

机构地区：[1]天津大学化工学院

出　　处：《天津大学学报》2007年第11期1291-1294,共4页Journal of Tianjin University(Science and Technology)

基　　金：天津市自然科学基金资助项目(043603211)

摘　　要：采用CO2激光在TC4合金表面熔覆TiN-Ti和TiN-NiCrBSi金属陶瓷涂层,利用XRD和SEM等分析了熔覆层的微观组织,测试了熔覆层的硬度.结果表明:在TiN-Ti激光熔覆层中,表层TiN颗粒全部溶解,底层TiN颗粒部分溶解,熔覆层的组织是在α-Ti基体上分布着TiN树枝晶和TiN颗粒,熔覆层的显微硬度在400～700 HV之间;TiN-NiCrBSi激光熔覆层的组织由γ-Ni树枝晶和TiN颗粒等相组成,显微硬度在900～1 200 HV之间;熔覆层与基材结合区为TC4合金和Ni基合金的混和凝固区,呈现树枝晶和胞状晶形态,显微硬度在600～650 HV之间。Laser cladding of TC4 alloys with TiN-Ti and TiN-NiCrBSi powders was carded out by CO2 laser. Microstructure of laser clad layers was characterized by XRD and SEM,and the microhardness of the laser clad layers was examined. The results show that,in TiN-Ti clad layers,all TiN powders in the upper layer and part of TiN powders in the bottom layer are dissolved. Dendrite and particles of TiN phase distribute on α-Ti matrix,and the microhardness is 400---700 HV. The TiN-NiCrBSi clad layers consist of γ-Ni dendrite and TiN particles with microhardness of 900---1 200 HV. The bonding zone of laser clad layers and substrate consists of TC4 and Ni alloys with dendrite and cellular structure with microhardness of 600--650 HV.

关 键 词：激光熔覆 TiN金属陶瓷涂层 微观组织 

分 类 号：TG156.99[金属学及工艺—热处理]