非晶-纳米晶增强激光涂层的物理与表面性能(英文)  

Physical Properties and Surface Performance of Nanocrystals-Amorphous Reinforced Laser Coating

作　　者：巩水利[1] 李嘉宁[1] 

机构地区：[1]北京航空制造工程研究所高能束流加工技术重点实验室,北京100024

出　　处：《稀有金属材料与工程》2013年第S2期235-239,共5页Rare Metal Materials and Engineering

基　　金：Supported by the China Postdoctoral Science Foundation Funded Project(2012M520135)

摘　　要：在TA7钛合金基材表面激光同轴送粉熔覆Stellite 20-TiB2-Ag混合粉末可生成纳米晶-非晶增强硬质涂层。对该涂层进行扫描电镜与高分辨透射电镜微观组织观察。结果表明,大量的纳米晶-非晶相,如TiAg纳米粒子及Si、Fe基非晶合金在该激光熔覆涂层中产生。纳米晶-非晶相界面具有高结合能,可在一定程度上阻碍纳米晶长大;另外,大量纳米晶相的产生使晶界自由能提高,导致涂层中点缺陷密度提高并产生晶格畸变。与基材TA7相比,Stellite 20-TiB2-Ag涂层的耐磨性能得到极大改善。The synthesis of a hard nanocrystals-amorphous reinforced coating on a TA7 titanium alloy by coaxial powder feeding laser cladding(LC) of the Stellite 20-TiB2-Ag mixed powders was investigated by means of scanning electron microscope(SEM) and high resolution transmission electron microscope(HRTEM).Results indicate that a lot of nanocrystals and amorphous phases,such as TiAg nanoscale particles(NP),Si and Fe based amorphous alloys are produced in such LC coating.The nanocrystalline/amorphous interface owns high bonding energy,which retards the growth of the nanocrystals in a certain extent; the production of the nanocrystals leads the free energy of the crystal boundary to strengthen,which increases the density of point defect,causing the lattice distortions of the coating.Compared with a TA7 alloy substrate,an improvement of the wear resistance is obtained for such LC coating.

关 键 词：稀有金属 激光 涂层材料 纳米材料 

分 类 号：TG174.4[金属学及工艺—金属表面处理]