原位生成棒晶增强Ti-B-X复相陶瓷的研究  

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

作　　者：李世波[1,2] 温广武[1] 张宝生[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院 [2]西北工业大学凝固技术国家重点实验室,西安710072

出　　处：《无机材料学报》2001年第6期1243-1249,共7页Journal of Inorganic Materials

摘　　要：Ｂ４Ｃ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．The rod-like phases TiB2 were formed by the reaction of B4C and Ti under 1800degreesC x 35 MPax1h sintering condition, the length of particle TiB2 was 10similar to30mum, some over 40mum; and the aspect ratio was 2similar to8. 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.m(1/2), 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.

关 键 词：原位生成 TiB2棒晶 显微结构 棒晶发育 硼化钛棒晶 钛-硼-碳复相陶瓷 

分 类 号：TQ174.758[化学工程—陶瓷工业]