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以WC和MgO为原料,先采用高能球磨法制备WC-MgO复合粉末,之后采用无压烧结法制备WC-MgO复合材料,进而研究稀土氧化物(La2O3)的添加量对无压烧结制备的该复合材料微观组织和力学性能的影响及机理。结果表明:La2O3的加入量为0.2wt%时,可抑制烧结过程中发生的脱碳现象,并能细化烧结组织,提高WC和增韧颗粒分布的均匀性;该材料的烧结致密度可达到92.77%,维氏硬度可达15.14 GPa,断裂韧性可达到9.73 MPa·m1/2;添加过量La2O3(≥0.3wt.%)则会使复合材料的致密度和力学性能降低。
Using WC and MgO as raw materials, WC-MgO composite powders were prepared by high-energy ball milling and WC-MgO composite was prepared by pressureless sintering. Then the effects of the addition amount of rare earth oxides (La2O3) Effect and Mechanism of Composite Microstructure and Mechanical Properties. The results show that the addition of 0.2wt% La2O3 can suppress the decarburization phenomenon during sintering, refine the sintered structure and improve the uniformity of WC and toughening particles distribution. The sintering density of the material can reach 92.77%, Vickers hardness up to 15.14 GPa and fracture toughness up to 9.73 MPa · m1 / 2. The addition of excessive La2O3 (≥0.3 wt.%) Will decrease the densification and mechanical properties of the composites.