论文

激光原位合成TiN/Ti3Al基复合涂层

  • 刘洪喜 ,
  • 张晓伟 ,
  • 蒋业华 ,
  • 王传琦 ,
  • 曾维华
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  • 昆明理工大学材料科学与工程学院, 昆明 650093
张晓伟, 男, 1984年生, 博士生

收稿日期: 2010-12-01

  修回日期: 2011-02-22

  网络出版日期: 2011-08-11

基金资助

国家自然科学基金项目51165015, 云南省自然科学基金项目2008ZC021M和国家大学生创新性实验计划项目091067448资助

LASER IN SITU SYNTHESIZED TiN/Ti3Al COMPOSITE COATINGS

  • LIU Hong-Xi ,
  • ZHANG Xiao-Wei ,
  • JIANG Ye-Hua ,
  • YU Zhuan-Qi ,
  • ZENG Wei-Hua
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  • Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093

Received date: 2010-12-01

  Revised date: 2011-02-22

  Online published: 2011-08-11

Supported by

Supported by National Natural Science Foundation of China(No.51165015)

摘要

利用Ti与AlN之间的高温化学反应, 在TC4钛合金表面激光原位合成了TiN/Ti3Al基金属间化合物复合涂层. 借助XRD和SEM分析了涂层的物相组成和显微组织. 结果表明,涂层主要由TiN和Ti3Al组成. 当Ti与AlN摩尔比为4∶2时, 涂层中TiN含量随激光功率密度的增大而减小; Ti与AlN摩尔比为4∶1时,TiN含量随激光功率密度的增大而增大. TiN增强相点阵常数的精确计算显示, 涂层中TiN相出现晶格畸变现象, 结合EDS分析表明, TiN固溶的Al含量随功率密度的增加而减小. SEM分析表明, TiN增强体的生长形态随着激光功率密度的增大由棒状逐渐向颗粒状转变. 当Ti与AlN的摩尔比为4∶1,激光功率密度为15.28 kW•s?cm-2时, 涂层表面的宏观形貌较好,微观组织无气孔和裂纹, 试样截面显微硬度自基体至涂层表面变化平缓, 涂层平均显微硬度达到844 HV0.2, 约为基体合金的3.4倍.

本文引用格式

刘洪喜 , 张晓伟 , 蒋业华 , 王传琦 , 曾维华 . 激光原位合成TiN/Ti3Al基复合涂层[J]. 金属学报, 2011 , 47(8) : 1086 -1093 . DOI: 10.3724/SP.J.1037.2010.00641

Abstract

Utilizing the high–temperature chemical reaction between Ti and AlN, TiN reinforced Ti3Al composite coating was in situ synthesized on TC4 alloy substrate by laser cladding technique. The phase constitution and microstructure of treated samples were examined by XRD and SEM. The results reveal that the coating is mainly composed of TiN and Ti3Al phase. When the molar ratio between Ti and AlN is 4∶2, the content of TiN reduces as the laser power density increases; whereas when the molar ratio between Ti and AlN is 4∶1, the content of TiN increases with increasing the laser power density. SEM observation shows that the morphology of TiN changes gradually from bar–shaped to granular with the increase of laser power density. When the molar ratio between Ti and AlN is 4∶1 and the laser power density is 15.28 kW·s·cm−2, the macro-morphology of surface coating is better, no pores and cracks appear. The average microhardness of laser cladding coating is 3.4 times larger than that of TC4 alloy substrate.

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