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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

由聚碳硅烷生成纳米SiC颗粒增强B4C基复相陶瓷的结构与性能

丁硕; 温广武; 雷廷权; 周玉   

  1. 哈尔滨工业大学材料科学与工程学院 哈尔滨 150001
  • 收稿日期:2001-09-12 修回日期:2002-01-09 出版日期:2002-09-20 网络出版日期:2002-09-20

Microstructure and Properties of Polycarbosilane Transferred Nano SiC Reinforced B4C Matrix Composites

DING Shuo; WEN Guang-Wu; LEI Ting-Quan; ZHOU Yu   

  1. School of Materials Science and Engineering; Harbin Institute of Technology; Harbin 150001; China
  • Received:2001-09-12 Revised:2002-01-09 Published:2002-09-20 Online:2002-09-20

PDF (PC)

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摘要： 制备了由聚碳硅烷（PCS）为先驱体裂解形成的纳米SiC增强的B4C基复合材料,并与直接球磨混合法制备的纳米SiC增强的B4C基复合材料进行了对比研究.实验结果表明,先驱体法制备的复合材料形成一种复杂的晶内/晶间结构;B4C内部的纳米SiC和Al2O3内部的少量纳米SiC、晶界处的层片状SiC、B4C晶粒内部的SiC亚晶界结构.材料的断裂方式以穿晶断裂为主,形成晶内裂纹扩展路径,增强了材料的韧性.采用PCS为先驱体工艺制备高性能的纳米复相陶瓷,其组织均匀性、致密度和力学性能均优于直接机械混合制备的纳米复合材料.

关键词: 碳化硼, 聚碳硅烷, 先驱体, 纳米SiC

Abstract: Nano-sized SiC reinforced B4C matrix composites were fabricated through a pyrolysis route from polycarbosilane(PCS) precursor. The microstructure and
properties of the materials, compared with the materials sintered by direct mixed powders, were investigated. It shows that, the composites fabricated via precursor
form a kind of complicated intra-intergranular structure: nano SiC within the grains of B4C and Al2O3, sharp angle-layered SiC precipitating in the grain
boundaries, and SiC substructures within the grains of B4C. The crack deflection within the crystal grains is caused by intragranular fracture, increasing the
fracture toughness significantly. The homogenization, relative density and mechanical properties of the composites fabricated by polycarbosilane precursor are higher
than those of the composites made by directly mixed powders.

Key words: boron carbide, polycarbosilane, precursor, nano SiC

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