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采用预置涂层和同轴送粉激光熔覆方法,分别以Ta/W混合粉末和纯W粉末为熔覆材料,纯Ta为基底,在Ta板上制备Ta-W合金涂层,对难熔金属材料的激光熔覆工艺方法进行了对比研究。利用扫描电镜(SEM)、能谱仪(EDS)及显微硬度计对两种方法所制备熔覆层的微观组织和显微硬度进行了分析。结果表明,预置粉末法激光熔覆层厚度均匀,稀释率低,涂层内部为粗大的Ta-W合金固溶体组织,熔覆层平均硬度为1500HV,高于基底10倍。同轴送粉法激光熔覆层与基底呈良好的冶金结合,熔深较大,涂层内部为致密细小的树枝状Ta-W合金固溶体,均匀分布于Ta中。涂层平均硬度为800HV,为基材的5倍。
Using pre-coating and coaxial powder coating laser cladding method, Ta / W mixed powder and pure W powder as cladding material, pure Ta as substrate, Ta-W alloy coating on Ta plate, The laser cladding technology of molten metal materials was compared. The microstructure and microhardness of the coatings prepared by the two methods were analyzed by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and microhardness tester. The results show that the thickness of the laser cladding layer is uniform and the dilution rate is low. The thickness of the coating is coarse Ta-W alloy solid solution. The average hardness of the cladding layer is 1500 HV, 10 times higher than that of the substrate. Coaxial powder feeding laser cladding layer and the substrate was a good metallurgical bond, the penetration depth is larger, the coating is dense small dendritic Ta-W alloy solid solution, uniformly distributed in Ta. The average hardness of the coating 800HV, 5 times the substrate.