TiB_2颗粒增强反应结合B_4C陶瓷的显微结构与性能（英文）

Microstructure and Property of TiB_2 Reinforced Reaction-bonded B_4C Composites

以微孔碳、颗粒级配碳化硼粉体、钛粉和硅粉为原料,通过多孔预制体真空熔渗Si工艺制备了硼化钛颗粒增强的反应结合碳化硼复相陶瓷,并通过X射线衍射、扫描电子显微镜、EDS能谱和透射电子显微镜对复合材料的显微结构进行表征。结果表明:在预制体中钛为15wt%时,所制备的复相陶瓷抗弯强度和断裂韧性分别为313 MPa和5.40 MPa·m1/2。原位反应生成的硼化钛对材料的增韧补强起到了积极的作用。

Dense B4C composites were fabricated by reaction bonding technique based on vacuum infiltration of sili- con melt into green preforms made of microporous carbon, B4C and Ti powders. Phase assemblage and microstructure of the composites were characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM）, energy dis- persive spectrum （EDS） and transmission electron microscope （TEM）. The flexural strength and fracture toughness of the composite with 15wt% Ti in its preform were 313 MPa and 5.40 MPa.m1/2, respectively. The in-situ generated TiB2 played a positive role in strengthening and toughening material.