无机材料学报

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原位生成棒晶增强Ti-B-C复相陶瓷的研究

李世波1,2; 温广武1; 张宝生1   

  1. 1. 哈尔滨工业大学材料科学与工程学院 哈尔滨 150006; 2. 西北工业大学凝固技术国家重点实验室, 西安 710072
  • 收稿日期:2000-12-25 修回日期:2001-02-10 出版日期:2001-11-20 网络出版日期:2001-11-20

Study of In Situ Formation of Rod-Like Phases Reinforced Ti-B-C Ceramics

LI Shi-Bo1,2; WEN Guang-Wu1; ZHANG Bao-Sheng1   

  1. 1. SChool of Material Science and Engineering; Harbin Institution of Technology; Harbin 150006; China; 2. State Key Laboratory of Solidification Processing; Northwestern Polytechnical University; Xi an 710072
  • Received:2000-12-25 Revised:2001-02-10 Published:2001-11-20 Online:2001-11-20

摘要: C与Ti在1800°C×35MPa×1h的烧结条件下反应生成了TiB2 棒晶,棒晶长度在10~30μm,其长径比在2~8范围.原位生成的棒晶赋予了材料具有极高的力学性能,材料的弯曲强度和断裂韧性分别为 680MPa和 12MPa·m1/2.通过 X射线衍射检测了材料的物相组成,利用扫描电镜及透射电镜观察了材料的显微结构.最后讨论了温度及金属Ti含量对棒晶TiB2的生成及发育的影响.

关键词: 原位生成, TiB2棒晶, 显微结构, 棒晶发育, 影响因素

Abstract: The rod-like phases TiB2 were formed by the reaction of B4C and Ti under 1800℃×35MPa×1h
sintering condition, the length of particle TiB2 was 10~30μm, some over 40μm; and the aspect ratio was 2~8. These rod-like phases
endowed the composites with high mechanical properties. The bending strength and the fracture toughness of the composites were 680MPa and 12MPa·m1/2,
respectively. The phases were examined by XRD; the microstructure of the composites was observed by SEM and TEM. The influence of sintering
temperature and Ti content on the growth and development of rod-like phases TiB2 was discussed.

Key words: in situ formation, rod-like phase TiB2, microstructure, phase growth, influence factors

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