ZrB2-SiCw ceramic composites synthesized by in situ reaction and spark plasma sintering
ZrB2-SiCw ceramic composites synthesized by in situ reaction and spark plasma sintering
复制标题
原位反应放电等离子烧结制备ZrB2-SiCw陶瓷复合材料
DOI：
10.1111/ijac.12720
复制
发表时间：
2017
影响因子：
2.1
通讯作者：
Zhang Rui
中科院分区：
文献类型：
--
作者：
Zhao Xiaotong;Shao Gang;Feng Lun;Wang Hailong;Fan Bingbing;Lu Hongxia;Xu Hongliang;Chen Deliang;Zhang Rui
采用溶胶-凝胶法和火花等离子烧结（SPS）制备了SiC晶须增强ZrB2 - SiCw复合材料，SiCw的设计成分为10 - 30 vol%。以二硼化锆、四乙氧基硅烷（TEOS）和活性炭为原料，采用溶胶-凝胶法制备了ZrB2 - sicw复合粉体，并在1700℃、40 MPa、5 min的压力下进行了SPS致密化。采用X射线衍射和扫描电镜分别研究了ZrB2 - sicw复合材料的相组成和微观结构。在不添加烧结添加剂的情况下，在1700℃烧结后，随着sicw含量从10 vol%增加到30vol%， ZrB2 - sicw复合材料的相对密度从83%提高到98.5%。同时，复合材料的断裂韧性和抗弯强度与相对密度的变化趋势相似。ZrB2‐30vol% sicw复合材料的断裂韧性为6.1 MPa·m1/2，抗弯强度为350 MPa，这主要归因于SiC晶须的形成。
SiC whisker reinforced ZrB2‐SiCwcomposites were prepared by sol‐gel method and spark plasma sintering (SPS) with designed composition of 10‐30 vol% SiCw. The ZrB2‐SiCwcomposite powder was synthesized by sol‐gel method using zirconium diboride, tetraethoxysilane (TEOS), and activated carbon as starting materials, then densified by SPS at 1700°C under a pressure of 40 MPa for 5 minutes. The phase compositions and microstructures of ZrB2‐SiCwcomposites were investigated by X‐ray diffraction and scanning electron microscope, respectively. The relative density of ZrB2‐SiCwcomposites increased from 83% to 98.5% with increasing SiCwcontents from 10 vol% to 30vol% after sintering at 1700°C without additional sintering additives. Meanwhile, the fracture toughness and flexural strength of as‐obtained composites exhibited a similar trend as relative density. ZrB2‐30vol% SiCwcomposite showed the highest fracture toughness of 6.1 MPa·m1/2and flexural strength of 350 MPa, which were attributed to the formation of SiC whisker.