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以Ni60+Ni/MoS2混合粉末为熔覆材料,采用Nd:YAG激光器在TC4合金表面进行了激光熔覆试验,利用OM、SEM、EDS、XRD等分析了激光熔覆层的微观组织,测试了激光熔覆层的显微硬度和摩擦磨损性能。结果表明,在激光熔覆过程中MoS2发生了分解,分解出的S与Cr反应形成了CrxSy不定比化合物,Ni60合金中的C与基材表层熔化的Ti反应形成了TiC。反应形成的CrxSy化合物呈近球状颗粒形态,TiC呈树枝晶形态,二者均匀地分布在熔覆层中。由于TiC的硬质强化作用和CrxSy的润滑作用,激光熔覆层不仅具有较高耐磨性能,而且具有低而平稳的摩擦系数。
The laser cladding test was carried out on the surface of TC4 alloy by using Ni60 + Ni / MoS2 mixed powder as cladding material. The microstructure of laser cladding layer was analyzed by OM, SEM, EDS and XRD. Microhardness and friction and wear properties of laser cladding. The results show that during the laser cladding, MoS2 decomposes. The dissociated S reacts with Cr to form a CrxSy non-proportional compound. In the Ni60 alloy, C reacts with the Ti melted on the surface of the substrate to form TiC. The CrxSy compound formed in the reaction was nearly spherical particle morphology, TiC dendrite morphology, the two evenly distributed in the cladding layer. Due to the hard strengthening effect of TiC and the lubricating effect of CrxSy, the laser cladding layer not only has higher wear resistance but also has a low and stable coefficient of friction.