Microstructure and tribological properties of laser clad Co-Ti3SiC2 composite coating on Ti6Al4V alloy

doi:10.13251/j.issn.0254-6051.2021.12.032

Abstract

Abstract: To improve the tribological properties of Ti6Al4V alloy, the laser clad composite coatings were prepared on the surface of Ti6Al4V alloy using pure Co powder, Co-2%Ti₃SiC₂, Co-5%Ti₃SiC₂, and Co-8%Ti₃SiC₂ mixed powder as raw materials. The phase composition, microstructure and tribological properties of the coatings at room temperature were analyzed by means of X-ray diffraction (XRD), scanning electron microscope (SEM) and friction wear testing machine. The results show that all the composite coatings are bonded well with the substrate, with some porosities observed, and the main phases of the pure Co coating consist of γ-Co, CoTi, and CoTi₂, while the phases of the Co-Ti₃SiC₂ coatings consist of γ-Co, CoTi, CoTi₂, TiC, Ti₅Si₃ and residual Ti₃SiC₂. The hardness of the coatings is increased by 1.90-2.15 times compared with the matrix, and the wear resistance is correspondingly improved by 3.02 to 5.44 times.

Key words: laser cladding, Co-Ti₃SiC₂ coating, Ti6Al4V alloy, tribological properties

CLC Number:

TG174

Meng Xiangjun, Shen Ying, Zhang Shaoyu, Xu Hongliang, Wang Yang, Liu Xiubo. Microstructure and tribological properties of laser clad Co-Ti₃SiC₂ composite coating on Ti6Al4V alloy[J]. Heat Treatment of Metals, 2021, 46(12): 199-203.

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Microstructure and tribological properties of laser clad Co-Ti₃SiC₂ composite coating on Ti6Al4V alloy

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