摘要
Spark plasma sintering was successfully used to produce WC-Co cermets with the addition of Cr3C2and TaC grain growth inhibitors. The spark plasma sintered compacts were investigated by scanning electron microscopy, X-ray diffraction analysis, density measurements, hardness tests, fracture toughness tests and elastic modulus tests. The results were comparedwithan inhibitor-free WC-Co cermet consolidated under the same process parameters. By using Cr3C2and TaC additives, it is possible to improve the hardness and fracture toughness of WC-Co cermets, but Cr3C2has better grain growth inhibition propertythan that of TaC. The best combination of hardness （HV30（2105±38）） and fracture toughness （（8.3±0.2）MPa·m^1/2） was obtained by the WC-5Co-2Cr3C2 cermet.
通过添加Cr_3C_2和Ta C晶粒长大抑制剂,采用等离子体烧结技术制备WC-Co金属陶瓷。采用扫描电镜、X射线衍射、密度测定、硬度测试、断裂韧性测试和弹性模量测试技术表征放电等离子烧结体。在相同的工艺参数下,与不添加WC-Co抑制剂的金属陶瓷进行了比较。结果表明,添加Cr_3C_2和Ta C抑制剂能提高WC-Co金属陶瓷的硬度和断裂韧性,且添加Cr_3C_2的陶瓷其晶粒生长抑制性能比添加Ta C的更好。WC-5Co-2Cr_3C_2金属陶瓷的最佳硬度和断裂韧性分别为HV_(30)(2105±38)和(8.3±0.2)MPa·m^(1/2)。
