原位反应制备Ti2AlNb/TiC+Ti3SiC2梯度材料的激光熔覆组织及成形机理

doi:10.3901/JME.2018.08.144

机械工程学报 ›› 2018, Vol. 54 ›› Issue (8): 144-150.doi: 10.3901/JME.2018.08.144

原位反应制备Ti₂AlNb/TiC+Ti₃SiC₂梯度材料的激光熔覆组织及成形机理

李能, 熊华平, 秦仁耀, 刘伟, 黄帅, 高超

中国航发北京航空材料研究院3D打印研究与工程技术中心北京 100095

收稿日期:2017-11-21 修回日期:2018-02-10 出版日期:2018-04-20 发布日期:2018-04-20
通讯作者: 熊华平(通信作者),男,1969年出生,博士,研究员,博士研究生导师。主要从事航空新材料的钎焊扩散焊、异种材料连接和激光增材制造等。E-mail:xionghuaping69@sina.cn;xionghp69@163.com
作者简介:李能,男,1985年出生,博士研究生。主要从事航空新材料的熔焊与特种焊、激光增材制造等。E-mail:lineng621@163.com
基金资助:
国家自然科学基金资助项目（51775525，51605456，51701198）。

Microstructure and Mechanism of Ti₂AlNb/TiC+Ti₃SiC₂ Gradient Materials by In-situ Reaction Laser Cladding

LI Neng, XIONG Huaping, QIN Renyao, LIU Wei, HUANG Shuai, GAO Chao

3D Printing Research & Engineering Technology Center, Beijing Institute of Aeronautical Materials, Beijing 100095

Received:2017-11-21 Revised:2018-02-10 Online:2018-04-20 Published:2018-04-20

摘要/Abstract

摘要： 设计从基体到Ti连接层、Ti+SiC混合过渡层、陶瓷复合层的结构，通过激光熔覆原位反应成功制备Ti₂AlNb/TiC+Ti₃SiC₂体系梯度材料。通过扫描电子显微镜、能谱分析和X射线衍射仪分析了梯度复合层的微观组织。结果表明，层与层之间结合良好，实现了成分与显微结构的梯度过渡。梯度复合层共有6层，总厚度约1.5 mm，在Ti+SiC的混合过渡层中，Ti与SiC反应生成TiC和Ti₅Si₃，并保留了残余的富Ti相，在Ti+Si+C的陶瓷复合层中，Ti、Si、C元素反应生成Ti₅Si₃、TiC和Ti₃SiC₂。梯度材料从基体、Ti连接层、Ti+SiC混合过渡层再到陶瓷复合层，显微硬度逐渐升高，最高硬度达到1 341 HV，最外层由于三元陶瓷相Ti₃SiC₂的生成，硬度比起TiC、Ti₅Si₃明显降低，因此复合层硬度有所下降。反应产物TiC、Ti₅Si₃和Ti₃SiC₂均是高熔点化合物，有利于提高材料的耐高温性能。

关键词: 激光熔覆, 梯度材料, 微观组织, 硬度

Abstract: The Ti connecting layer-Ti+SiC transition layer-ceramic composite layers structure is designed and the Ti₂AlNb/TiC+ Ti₃SiC₂ system gradient material is successfully fabricated by in-situ reaction laser cladding. The microstructures of different layers are analyzed by scanning electron microscope(SEM), energy dispersive spectroscopy(EDS) and X-ray diffraction(XRD). The results show that the interlayer bonding is fine and the gradient transition in the composition and the microstructure is realized. The gradient material consists of six composite layers and the total thickness is 1.5 mm. In the Ti+SiC transition layers, Ti and SiC react to produce TiC and Ti₅Si₃, and some Ti-rich phases are retained in the layers. In the ceramic composite layers, Ti, Si and C react to form Ti₅Si₃, TiC and Ti₃SiC₂. The microhardness gradually increases from the matrix, to the Ti connecting layer, the Ti+SiC transition layer and to the ceramic composite layer. The maximum value is 1 341 HV. The ternary Ti₃SiC₂ in the outermost layer exhibits the evidently lower microhardness than TiC and Ti₅Si₃, which leads to a slight decrease in the microhardness of the composite layer. The fabricated gradient materials should exhibit superior heat-resistance due to the presence of refractory TiC, Ti₅Si₃ and Ti₃SiC₂.

Key words: FGM, laser cladding, microhardness, microstructure

中图分类号:

TG148

李能, 熊华平, 秦仁耀, 刘伟, 黄帅, 高超. 原位反应制备Ti₂AlNb/TiC+Ti₃SiC₂梯度材料的激光熔覆组织及成形机理[J]. 机械工程学报, 2018, 54(8): 144-150.

LI Neng, XIONG Huaping, QIN Renyao, LIU Wei, HUANG Shuai, GAO Chao. Microstructure and Mechanism of Ti₂AlNb/TiC+Ti₃SiC₂ Gradient Materials by In-situ Reaction Laser Cladding[J]. Journal of Mechanical Engineering, 2018, 54(8): 144-150.

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原位反应制备Ti₂AlNb/TiC+Ti₃SiC₂梯度材料的激光熔覆组织及成形机理

Microstructure and Mechanism of Ti₂AlNb/TiC+Ti₃SiC₂ Gradient Materials by In-situ Reaction Laser Cladding

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