摘要
采用放电等离子体烧结(SPS)技术制备不同Si C含量的ZrB_2/Si C/Zr_2Al_4C_5复相陶瓷,并对其烧结特性、显微结构、力学性能和抗氧化性能进行了研究。结果表明:掺入Si C化合物促进了复相陶瓷的致密化过程,抑制了ZrB_2晶粒长大;当Si C掺入量为20 vol%时,ZrB_2/Si C/Zr_2Al_4C_5陶瓷的断裂韧性值为4.81 MPa×m^(1/2)。掺入Si C化合物后,复相陶瓷的抗氧化性能得到明显改善,当Si C化合物的含量为20 vol%时,其抗氧化性能最佳,分析其机理发现当掺入Si C化合物后,复相陶瓷高温氧化后在其表面生成了致密稳定的Al_2O_3、B_2O_3-Al_2O_3、Si O_2和Al-Si-O玻璃相等物质,从而阻止了氧原子进入到陶瓷基体中,提高了复相陶瓷的抗氧化性能。
The ZrB_2/SiC/Zr_2Al_4C_5 composite ceramics with various contents of SiC were prepared by spark plasma sintering.The sintering behavior,microstructure,mechanical properties and oxidation resistance were studied.The results indicate that SiC addition promotes the sintering of the composite ceramics and inhibits the growth of ZrB_2 grains.When the content of SiC is 20 vol%,the toughness of the composite ceramics is 4.81 MPa×m^(1/2).With the increase of the content of SiC,the oxidation resistance of the composite ceramics is obviously enhanced.The best oxidation resistance of the composite ceramic is achieved with 20 vol%SiC.The analysis of the results show that the addition of SiC prevents the oxygen atoms from entering the ceramic matrix and enhances the oxidation resistance of composite ceramics due to the dense and stable Al_2O_3,B_2O_3-Al_2O_3,SiO_2 and Al-Si-O glasses formed thereon.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2018年第S1期282-287,共6页
Rare Metal Materials and Engineering
基金
甘肃省科技计划项目(1506RJYA270)
甘肃省中央高校基本科研业务费专项资金项目(zyp2015008)
甘肃省高等学校科研项目(2015B-009)
