Ce和Y对YG6硬质合金组织及性能的影响

发布时间：2018-07-31 05:57

【摘要】：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。
[Abstract]:Rare earth WC-6%Co cemented carbides were prepared by conventional cemented carbide sintering process using white tungsten as raw material. The effects of rare earth elements on the microstructure, magnetic properties and mechanical properties of the alloys were studied by means of XRD-SEM and property test. The results showed that the addition of 0.12% ce or Y was beneficial to the homogeneous distribution of Co phase and the increase of Co magnetic properties of the 伪 -Co phase and the cobalt magnetic properties of the Ce-YG6 and Y-YG6 alloys were 5.28% and 5.35% respectively. The average grain size of the alloy was 0.92 渭 m Y-YG6, and the hardness of the alloy was 0.92 渭 mYYG6. The flexural strength and fracture toughness reached HRA92.5 ~ 2610 MPa and 13.26 MPa m ~ (1 / 2), respectively, and increased by 1.65% and 11.24%, respectively; the coercive force of rare earth YG6 cemented carbide increased by 24.14%; the compound formed by the reaction of rare earth with the impurity elements such as CaOSiS and O in the alloy played an important role. The function of purifying grain boundary and phase boundary; The properties of YG6 alloy prepared by adding rare earth elements are better than those of YG6 alloy prepared by black tungsten.
【作者单位】：南昌大学材料科学与工程学院;南昌航空大学分析测试中心;江西省科学研究院应用物理研究所;
【基金】：国家科技支撑计划资助项目(2011BAC10B04) 国家高技术研究发展计划(863计划)资助项目(2012AA061902) 国家自然科学基金项目(51564036;50904035) 全国科学院联盟专项赣财[2013]7号
【分类号】：TG135.5

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