摘要
采用组成(质量分数/%)分别为15Si-5NaF-80Al_2O_3、15Si-10Zr-5NaF-70Al_2O_3的渗剂,应用扩散渗工艺在TC4合金表面制备了单一硅化物涂层和锆改性硅化物涂层,对比研究了2种涂层的显微组织以及在不同冲蚀角度下的耐固体粒子冲蚀行为。结果表明:2种涂层均可分为3层,由(Ti,X)Si_2(X为铝、钒或锆)相组成的外层、由TiSi相组成的中间层以及由Ti_5Si_4+Ti_5Si_3相组成的内层,锆改性硅化物涂层的组织更致密,且无裂纹存在;2种涂层的冲蚀率均随冲蚀角度的增大而增加,但锆改性硅化物涂层表现出更好的耐固体粒子冲蚀性能;在大冲蚀角度下,锆改性对硅化物涂层耐固体粒子冲蚀性能的改善效果比在小冲蚀角度下的更加显著。
Pure silicide coating and Zr modified silicide coating were prepared on surface of TC4 alloy by diffusion penetration with the penetration agent composed of 15 Si-5 NaF-80 Al2 O3 and 15 Si-10 Zr-5 NaF-70 Al2 O3（mass fraction/%）,respectively.The microstructure and the solid particle erosion resistance at diffrerent errosion angles of the two coatings were studied and compared.The results show that the two coatings consisted of three layers,including an outer layer composed of（Ti,X）Si2（X=Al,V or Zr）phase,a middle layer composed of TiSi phase and an inner layer composed of Ti5 Si4 and Ti5 Si3 phases.The Zr modified silicide coating had a relatively dense structure,and no cracks existed.The erosion rate of the two coatings increased with the increase of the erosion angle,and the Zr modified silicide coating showed a better solid particle erosion resistance than the pure silicide coating.The Zr modification improved the solid particle erosion resistance of the silicide coating more significantly at a high erosion angle than at a low erosion angle.
作者
李轩
李寅凤
李涛
谢文玲
LI Xuan;LI Yinfeng;LI Tao;XIE Wenling(College of Mechanical Engineering;Sichuan Provincial Key Lab of Process Equipment and Control,Sichuan University of Science and Engineering,Zigong 643000,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2018年第10期62-66,71,共6页
Materials For Mechanical Engineering
基金
国家自然科学基金资助项目(51301115)
过程装备与控制工程四川省高校重点实验室开放课题(GK201701)
四川理工学院人才引进项目(2016RCL22)
自贡市重点科技计划项目(2017XC19)
