摘要
通过热压和热等静压反应烧结，从相复合角度探索了改善碳化硼机械性能及发展新型碳化硼基超硬材料的可行性，并给出了最新研究结果。
The poor sinterability of B4C limits its widespread application because both high temperature and high pressure are required for a complete densification. Moreover,B4C suffers from a low strength and fracture toughness,but possesses a high potential use in hiqh temperature region because of its superb hardness and corrosion resistance. Hot press reaction sintering of B4C-Si-WC/TiC-Co mixtures results in B4C-TiB2-W2B5 composite with a high density and much improved mechanical properties. The iufluence of hot isostatic pressing(HIP)on the im-provement of mechanical properties is also investigated and related to the strengthening and toughening mechanisms. In comparison to single phase B4C ceramics,bending strength is im-proved to 1030MPa(HIP),K(IC) to 5. 6MP3·,hardness is comparable with HV=38GPa,and of practical importance, sintering temperature is lowered to 1700～1800℃.
出处
《航空学报》
EI
CAS
CSCD
北大核心
1994年第6期761-764,共4页
Acta Aeronautica et Astronautica Sinica
关键词
碳化硼
化学反应
烧结
机械性能
Boron carbides, chemical reactions-sintering,mechanical properties
