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钛合金表面激光熔覆TiC/Ti-Ti2 Co涂层耐磨性
Wear resistance of laser clad TiC/Ti-Ti2 Co coating on titanium alloy
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摘要: 为了提高钛合金的耐磨性能,以Co基合金粉末、钛粉和活性碳为原料,利用激光熔覆技术在TC4钛合金基材表面制得以原位自生TiC为增强相的耐磨涂层,用光学显微镜、扫描电子显微镜、X射线衍射仪和能谱仪等分析了涂层的显微组织、相组成及成分,在室温干滑动磨损条件下测试了涂层的室温耐磨性能。结果表明,原位生成的TiC增强相主要以发达树枝晶形态均匀分布于β-Ti,Ti2Co共晶组织基体中;β-Ti为不规则枝晶或胞状晶,而Ti2Co主要呈不规则块状分布,少量-Ti2Co以片层状形成于β-Ti枝晶臂间;涂层与基材呈良好的冶金结合,显微硬度约HV600～HV700,具有优异的室温干滑动磨损性能,其中,硬质TiC相起主要抗磨作用。这一结果对提高钛合金的耐磨性能是有帮助的。Abstract: In order to improve the tribological properties of titanium alloy,a wear resistant coating with a microstructure consisting of insitu TiC primary dendrites and Ti-Ti2Co matrix was fabricated on a substrate of titanium alloy TC4 by means of laser cladding using Co-based alloy powders,activated carbon and titanium powders as the precursor materials.The microstructure and composition of the intermetallic composite coating was studied by means of optical microscope,scanning electron microscope,X-ray diffraction,energy dispersive spectrometer.The wear resistance of the coating was tested under dry sliding wear condition at room temperature.It is revealed that the laser clad composite coating has a rapidly solidified homogeneous microstructure and is metallurgically bonded to the substrate.The developed in situ TiC primary dendrites dispersed in the B-Ti-Ti2Co matrix of the coating as reinforcements.The B-Ti phase shows irregular crystal or cell dendrites.And most of the Ti2Co phase distributes over the matrix as irregular block crystal,with some lamellar Ti2Co formed in the inter-dendrite arms of the β-Ti phase.It is found that the microhardness of the coating is in the range of HV600～HV700.The laser clad TiC/ Ti-Ti2Co coating,in which the TiC phase plays a main role in enhancement,has excellent wear resistance under dry sliding wear test conditions.The results show that the coating is helpful to improve wear resistance of titanium alloy.
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