会议专题

Fabrication of Fe-TiB2 Composites and Their Properties

  Some iron(Fe)matrix composites reinforced by ceramic particulates offer a possibility of fabricating novel steels as hard materials.In this work,Fe matrix composites reinforced by titanium diboride(TiB2)were fabricated by spark plasma sintering.The effects of sintering temperatures on their microstructures,thermal and mechanical properties were investigated experimentally.The relative density of composites was improved with increasing sintering temperature,which led to their high densification promotion.The densification was caused by the plastic and creep deformation just through iron matrix powders.There were just Fe and TiB2 phases in the composite sintered at 1273 K,which agreed with initial starting powders.In contrast,both Fe2B and TiC were formed when sintering temperature increased up to 1323 K because of the decomposition of TiB2 due to both the thermal instability of TiB2 in pure Fe and diffusion of carbon from graphite dies.Consequently,the volume fraction of TiB2 decreased while that of Fe2B increased as the newly formed phase.Vickers hardness and density improved with the increase of sintering temperatures,while thermal conductivity(TC)showed the minimum value in spark sintering at 1373 K.

Fe-TiB2 Spark plasma sintering Internal sintering reactions Vickers hardness Thermal conductivity

Ke Yujiao Matsugi Kazuhiro Xu Zhefeng Choi Yongbum Wang Mingzhi Yu Jinku

Department of Mechanical Materials Engineering,Hiroshima University,Higashi-Hiroshima 739-8527,Japan State Key Laboratory of Metastable Material Science and Technology,Yanshan University,Hebei Street W

国际会议

2018世界粉末冶金大会

北京

英文

367-372

2018-09-16(万方平台首次上网日期,不代表论文的发表时间)