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以白钨为原料,采用常规硬质合金烧结工艺制备了稀土WC-6%Co硬质合金,通过XRD、SEM以及性能测试等方法研究了稀土对合金组织结构、磁性能及力学性能的影响。结果表明,添加0.12%(质量分数)Ce或Y有利于Co相分布均匀且提高了α-Co相的比例,Ce-YG6和Y-YG6合金钴磁分别达到了5.28%和5.35%;YG6合金晶粒得到细化,Y-YG6合金平均晶粒尺寸为0.92μm;Y-YG6合金的硬度、抗弯强度和断裂韧性分别达到了HRA92.5、2610 MPa和13.26 MPa·m~(1/2),分别提高了1.65%、50.61%和11.24%;稀土YG6硬质合金的矫顽磁力最大增幅达24.14%;稀土与合金中的Ca、Si、S和O等杂质元素反应形成的化合物起到净化晶界和相界的作用;添加稀土后,白钨制备的YG6合金性能优于黑钨制备的YG6合金性能。
The rare earth WC-6% Co cemented carbide was prepared by the conventional cemented carbide sintering process using white tungsten as raw material. The effects of rare earth on the microstructure, magnetic properties and mechanical properties of the alloy were studied by XRD, SEM and performance tests. The results show that adding Ce or Y 0.12% (mass fraction) is conducive to the uniform distribution of Co phase and the proportion of α-Co phase, and the cobalt magnetic of Ce-YG6 and Y-YG6 alloy respectively reaches 5.28% and 5.35% The grain size of Y-YG6 alloy is 0.92μm. The hardness, flexural strength and fracture toughness of Y-YG6 alloy reach 92.5, 2610 MPa and 13.26 MPa · m ~ (1/2) ), Respectively, increased by 1.65%, 50.61% and 11.24% respectively. The maximum increase of coercivity of rare earth YG6 cemented carbide reached 24.14%. The compounds formed by the reaction of rare earth with Ca, Si, S and O, Purification of the grain boundary and phase boundary role; addition of rare earth, white tungsten YG6 alloy prepared better performance than the black tungsten YG6 alloy performance.