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

doi:10.3901/JME.2018.08.144

Abstract

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

CLC Number:

TG148

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

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