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在Cu-Cr-Zr合金表面上以KF-6为过渡层,激光熔覆制备了Ni-Cr-TiB_2-CaF_2复合涂层,研究了不同含量的TiB_2颗粒增强相对复合涂层组织及性能的影响。采用光学显微镜(OM)、扫描电镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)等手段分析了复合涂层的显微组织和硬度,测试了涂层的摩擦磨损性能。结果表明,TiB_2含量为5%、10%的复合涂层组织主要由颗粒相和树枝晶组成;随着TiB_2含量增加,复合涂层组织中生成了板状组织和TiB_2团聚物。TiB_2含量为20%的复合涂层显微硬度(HV_(0.1))达1 200,约为铜合金的12倍;常温摩擦因数为0.30左右,耐磨性能优异。
Ni-Cr-TiB_2-CaF_2 composite coatings were prepared by laser cladding KF-6 on the surface of Cu-Cr-Zr alloy, and the effects of different content of TiB 2 particles on the microstructure and properties of the composite coatings were studied . The microstructure and hardness of the composite coatings were analyzed by optical microscope (OM), scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The tribological properties of the coatings were tested. The results show that the microstructure and the dendrites of the composite coatings with TiB 2 content of 5% and 10% are mainly composed of granular phase and dendrite. With the increase of TiB 2 content, plate-like and TiB 2 agglomerates are formed in the composite coating. The microhardness (HV_ (0.1)) of composite coating with TiB2 content of 20% is about 1200, which is about 12 times that of copper alloy. The friction coefficient of normal temperature is about 0.30, and its wear resistance is excellent.