The nanocomposite WC-Co powders were prepared through planetary ball milling method.Effects of grain growth inhibitor addition and the vacuum sintering parameters on the microstructure and properties of ultrafine WC-1...The nanocomposite WC-Co powders were prepared through planetary ball milling method.Effects of grain growth inhibitor addition and the vacuum sintering parameters on the microstructure and properties of ultrafine WC-10Co cemented carbides were investigated using X-ray diffractometer,scanning electron microscope and mechanical property tester.The results show that VC and NbC additions can refine the WC grains,decrease the volume fraction of Co3W3C phase in ultrafine WC-10Co cemented carbides,and increase the hardness and fracture toughness of the base alloys.After sintering for 60 min at 1 400℃,the average grain size and hardness of ultrafine-grained WC-10Co-1VC cemented carbide are 470 nm and HRA 91.5,respectively.The fracture toughness of cemented carbide WC-10Co-1NbC alloy is over 7 MN·m -3/2 .展开更多
为满足刀具、模具和耐磨件等工具领域的需要,研制了新型TiB2基硬质合金.在TiB2 Fe Mo硬质合金中,利用常规硬质合金生产工艺,研究不同含量的VC对合金晶粒度和性能的影响.与未添加VC的试样相比,添加0.5%VC后,合金中超细TiB2晶粒由38.94%...为满足刀具、模具和耐磨件等工具领域的需要,研制了新型TiB2基硬质合金.在TiB2 Fe Mo硬质合金中,利用常规硬质合金生产工艺,研究不同含量的VC对合金晶粒度和性能的影响.与未添加VC的试样相比,添加0.5%VC后,合金中超细TiB2晶粒由38.94%增加到59.39%;耐磨性提高了53.8%,抗氧化性提高了60%,800℃下抗弯强度比室温抗弯强度仅下降7.3%.表明适量添加VC可以使TiB2 Fe Mo硬质合金的耐磨性、高温强度和高温抗氧化性得到改善;可有效抑制晶粒长大,使硬质相颗粒均匀细化.展开更多
本文研究了VC的不同添加方式对WC-6%Ni(0.9%Cr 3 C 2)合金组织的影响,分别是在WC碳化阶段添加和在混合料球磨阶段添加。结果表明在混合料球磨阶段添加VC的样品烧结后表面出现麻面,实际是Ni聚集同时伴随Cr、V的偏析,另外在该样品内部也...本文研究了VC的不同添加方式对WC-6%Ni(0.9%Cr 3 C 2)合金组织的影响,分别是在WC碳化阶段添加和在混合料球磨阶段添加。结果表明在混合料球磨阶段添加VC的样品烧结后表面出现麻面,实际是Ni聚集同时伴随Cr、V的偏析,另外在该样品内部也存在较多显微孔隙。展开更多
基金Project(50823006)supported by the National Natural Science Foundation of ChinaProject(200801348)supported by China Postdoctoral Science FoundationProject(50721003)supported by Innovative Research Groups of the National Natural Science Foundation of China
文摘The nanocomposite WC-Co powders were prepared through planetary ball milling method.Effects of grain growth inhibitor addition and the vacuum sintering parameters on the microstructure and properties of ultrafine WC-10Co cemented carbides were investigated using X-ray diffractometer,scanning electron microscope and mechanical property tester.The results show that VC and NbC additions can refine the WC grains,decrease the volume fraction of Co3W3C phase in ultrafine WC-10Co cemented carbides,and increase the hardness and fracture toughness of the base alloys.After sintering for 60 min at 1 400℃,the average grain size and hardness of ultrafine-grained WC-10Co-1VC cemented carbide are 470 nm and HRA 91.5,respectively.The fracture toughness of cemented carbide WC-10Co-1NbC alloy is over 7 MN·m -3/2 .
文摘为满足刀具、模具和耐磨件等工具领域的需要,研制了新型TiB2基硬质合金.在TiB2 Fe Mo硬质合金中,利用常规硬质合金生产工艺,研究不同含量的VC对合金晶粒度和性能的影响.与未添加VC的试样相比,添加0.5%VC后,合金中超细TiB2晶粒由38.94%增加到59.39%;耐磨性提高了53.8%,抗氧化性提高了60%,800℃下抗弯强度比室温抗弯强度仅下降7.3%.表明适量添加VC可以使TiB2 Fe Mo硬质合金的耐磨性、高温强度和高温抗氧化性得到改善;可有效抑制晶粒长大,使硬质相颗粒均匀细化.