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中文摘要：
采用高温氢还原工艺制备中颗粒钨粉,经添加适量炭黑球磨混合后,分别置于管式石墨通氢碳化炉中于1950和1680℃长时间碳化获得高温中颗粒WC粉和普通中颗粒WC粉末,继而在H2保护气氛下于1470℃的温度下烧结制备出WC-6%Co（质量分数）烧结体。通过费氏粒度仪和马尔文粒度分布仪分别测定了WC粉体的平均粒度和粒度分布,采用X射线衍射（XRD）分析了碳化产物的相成分。用扫描电镜（SEM）观察了粉末的形貌和烧结体的显微组织结构,按硬质合金性能测试标准对WC-6%Co烧结体的物理和力学性能进行了测定;研究了高温WC粉对低钴硬质合金性能的影响,并与普通工艺生产的YG6合金的性能进行了对比分析。结果表明,高温氢还原工艺制备的中颗粒钨粉粒度均匀,经高温碳化后所获WC粉粒度粗化,颗粒尺寸均匀,且颗粒表面光滑、发育完整、亚晶粗大、晶格缺陷少、碳化完全、纯度较高。高温WC粉制备的WC-6%Co合金的显微组织均匀,且WC硬质相晶形完整,平均晶粒度2.0～2.5μm,硬度和抗弯强度分别为HRA90.0和3000 MPa,综合性能优于YG6牌号合金性能,因而在地矿工具、切削刀具,冲压模具等领域有较高的应用价值。
英文摘要：
Medium-size tungsten powders were prepared through high temperature hydrogen reduction process and then mixed homogeneously with carbon by ball milling. The mixtures were carbonized in the H2 atmosphere at 1950 and 1680 ℃ respectively to preparehigh temperature medium and normal size tungsten carbide powders. WC-6Co （%, mass fraction） alloys were sintered at 1470 ℃ in a hydrogen protected molybdenum wire furnace. The particle size and particle size distribution of the powders were measured by usingFisher sizer and Malvin particle size distribution equipment, and the phases of carbonization products were analyzed using X-ray diffraction （XRD）. The effects of high temperature medium-size tungsten carbide powders on the properties of low cobalt cemented carbidewere studied. The performance of WC-6Co sintered alloys were tested and compared with the performance of YG6 cemented carbide produced by normal tungsten carbide powders carbonized at relatively lower temperature. The physical and mechanical properties ofWC-6Co sintered composites were tested. The morphology and microstrueture of powders and sintered alloys were observed by scanning electronic microscope （SEM）. It showed that particle size of high temperature WC powder was larger obviously than that of the originaltungsten powder. The grains of high temperatm＇e W powder were developed completely and uniform with smooth surfaces. The high tempera- ture WC powder was carbonized completely and its subgrain was coarse, the purity was higher and the lattice defects were lower. The micro-structure of WC-6Co alloy was homogenously, crystalline form was integrity, the average grain size of WC crystalline was 2.0 to 2. 5 μn, the hardness and bending strength were HRA90.0, 3000 MPa respectively. So the properties of the alloy was better than that of YG6 alloy.
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