摘要
在基体中添加纳米TiN粉(质量分数为0.05)的条件下,用三点弯曲法和扫描电镜等研究了粉末单向冷模压压制工艺和烧结技术对Ti(C,N)基金属陶瓷的力学性能和微观组织的影响.实验结果表明:烧结坯的抗弯强度先随生坯的压制压力(≤150 MPa)增加而增加,随后(210 MPa^600 MPa)增加缓慢,最后(≥600MPa)下降;烧结坯的变形率则随生坯的压制压力(≥300 MPa)增加而增大;最佳生坯的压制压力范围是150MPa^210 MPa.实验结果表明:两阶段烧结法优于传统烧结法,烧结坯的微观组织均匀,抗弯强度增加.
The effect of a uniaxial cooling die-pressing technique and sintering methods on mechanical properties and microstructure of Ti（C,N）-based cermets with addition of nano-TiN powder were studied using three-point bending test, SEM and so on when nano-TiN powder content in matrix was 0.05. The experiments result showed that transverse rupture strength （TRS） of the samples firstly increased with the increase of compacting pressure （≤ 150 MPa） of the green compact. Secondly changed little in range from 210 MPa to 600 MPa, finally decreased （≥600 MPa）. The distortion rate of the samples increased with the increase of compacting pressure （≥300 MPa） of the green compact. The optimum compacting pressure of the green compact was in range from 150 MPa to 210 MPa. The comparison between the result of conventional sintering method and two-step sintering method indicated that the latter was superior to the previous one. The microstructure of the samples was homogeneous and its transverse rupture strength （TRS） was enhanced.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第2期108-111,共4页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(50074017)
