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以偏钨酸铵、硝酸铜和硝酸钇为原料,采用EDTA-柠檬酸法制备了含Y_2O_3(0~0.8%)的Y_2O_3/W-20Cu复合粉体,经成形、烧结获得了Y_2O_3/W-Cu复合材料烧结体。对Y_2O_3/W-Cu复合粉体的物相、形貌进行表征;考察了Y_2O_3的添加对Y_2O_3/WCu复合粉体的烧结性能以及烧结体的微观组织、物理和力学性能的影响。结果表明,所制备的Y_2O_3/W-Cu复合粉体的粒度在100~200 nm,粉体具有良好的烧结性能,其成形压坯经1200℃烧结后,相对密度可达98%以上,导电率高于41%IACS。此外,适量Y_2O_3的添加,可改善W-Cu材料的组织和力学性能,添加Y_2O_3的Y_2O_3/W-20Cu材料的抗弯强度和维氏硬度可达1040 MPa和312 HV。
Ammonium metatungstate, cupric nitrate and yttrium nitrate were used as raw materials to synthesize Y_2O_3 / W-20Cu composite powders with Y_2O_3 (0 ~ 0.8%) by EDTA-citric acid method. Cu composite sintered body. The phase and morphology of Y_2O_3 / W-Cu composite powders were characterized. The effects of Y_2O_3 addition on the sintering properties of Y_2O_3 / WCu composite powders and the microstructure, physical and mechanical properties of Y_2O_3 / WC-Cu composite powders were investigated. The results show that the particle size of Y2O3 / W-Cu composite powders is in the range of 100-200 nm and the sintering properties are good. The sintered compact has a relative density of more than 98% after sintering at 1200 ℃. The electrical conductivity Higher than 41% IACS. In addition, the addition of proper amount of Y_2O_3 can improve the microstructure and mechanical properties of W-Cu materials. The flexural strength and Vickers hardness of Y_2O_3 / W-20Cu with Y_2O_3 can reach 1040 MPa and 312 HV.