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
Since some transition metal diborides have the same crystal structure with TiB 2, which can react with TiB 2 to form solid solution by adequate technique. With ZrB 2 used as additive, the TiB 2-ZrB 2 solid solution wa...Since some transition metal diborides have the same crystal structure with TiB 2, which can react with TiB 2 to form solid solution by adequate technique. With ZrB 2 used as additive, the TiB 2-ZrB 2 solid solution was prepared by hot pressing. The effects of additive content on mechanical properties of composite were investigated. The microstructure analyzing were employed by EPMA, SEM and TEM. It is shown that TiB 2 can partly form solid solution with ZrB 2 and redound to gain uniform grains, which results in the increase of mechanical properties.展开更多
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.
文摘Since some transition metal diborides have the same crystal structure with TiB 2, which can react with TiB 2 to form solid solution by adequate technique. With ZrB 2 used as additive, the TiB 2-ZrB 2 solid solution was prepared by hot pressing. The effects of additive content on mechanical properties of composite were investigated. The microstructure analyzing were employed by EPMA, SEM and TEM. It is shown that TiB 2 can partly form solid solution with ZrB 2 and redound to gain uniform grains, which results in the increase of mechanical properties.
