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通过球磨诱导生成薄片状W晶源,再引入超细黄钨(纳米W源)、碳黑(活性碳源)、钴及适量晶粒长大抑制剂(Cr_3C_2)高效球磨生成含片状晶W/Co/C复合粉末,于低压真空烧结炉中在1410℃的温度下一次碳化烧结制备了片状晶强化新型结构WC-10%Co(质量分数,下同)硬质合金,研究了20%片状W的引入对WC-10%Co硬质合金显微组织结构和性能的影响。通过比表面测定仪和费氏粒度仪测定了粉体的比表面和粒度,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-Co烧结体的物理和力学性能进行了测定。结果表明,碳辅助氢还原球磨诱导生成含片状晶W/Co/C复合粉末,经一次碳化烧结可制备出显微组织结构明显不同于普通合金的含片状晶新型结构WC-Co硬质合金;20%片状W粉末的引入致使合金整体晶粒尺寸偏粗,矫顽磁力偏低,但其片状晶和超细晶粒均布的组织结构,不仅能有效提高合金的硬度,还能改善合金的断裂韧性。
The flake W crystal source was induced by ball milling, and then the flake crystal W was produced by ball milling with ultrafine yellow tungsten (W source), carbon black (activated carbon source), cobalt and Cr_3C_2 / Co / C composite powder, a new sheet WC-10% Co (mass fraction, the same below) cemented carbide was prepared by carbonization sintering in a low-pressure vacuum sintering furnace at a temperature of 1410 ° C. The effects of 20% Effect of Flake W Addition on Microstructure and Properties of WC-10% Co Cemented Carbide. The specific surface area and particle size of the powder were measured by BET and Fischer-Tropsch particle size analyzer. The morphology of the powder and the microstructure of the sintered body were observed by scanning electron microscopy (SEM). The WC The physical and mechanical properties of the -Co sintered body were measured. The results show that carbon-assisted hydrogen reduction ball milling induced the formation of sheet-like crystal W / Co / C composite powder, and a carbonized sintered WC-Co hard structure containing microstructure was obviously different from ordinary alloy Alloy. The introduction of 20% flake W powder resulted in the coarser grain size and lower coercivity of the alloy. However, the flaky and ultrafine grain structure of the alloy could not only effectively improve the hardness of the alloy, Can improve the fracture toughness of the alloy.