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Microstructural evolution of h-BN matrix composite ceramics with La-Al-Si-O glass phase during hot-pressed sintering

查看全文 作　　者：Baofu [1,2]QIU;Xiaoming [1,2,3]DUAN;Zhuo [1,2]ZHANG;Chen [1,2]ZHAO;Bo [1,2]NIU;Peigang [1,2]HE;Delong [1,2]CAI;Lei [1,2]CHEN;Zhihua [1,2,3]YANG;Yujin [1,2]WANG;Dechang [1,2,3]JIA;Yu [1,2]ZHOU 高影响力作者 机构地区：[1]Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology,Harbin Institute of Technology,Harbin 150001,China;[2]Institute for Advanced Ceramics,School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;[3]State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China高影响力机构 出　　处：《Journal of Advanced Ceramics》索引2021年第10卷第3期,共9页高影响力期刊 基　　金：This study was financially supported by the National Key Research and Development Program of China(No.2017YFB0310400);the National Natural Science Foundation of China(Nos.52072089,51672060,and 51832002). 摘　　要：BN/La-Al-Si-O composite ceramics were fabricated by hot-pressed sintering using hexagonal boron nitride(h-BN),lanthanum oxide(La_(2)O_(3)),aluminia(Al_(2)O_(3)),and amorphous silica(SiO_(2))as the raw materials.The effects of sintering temperature on microstructural evolution,bulk density,apparent porosity,and mechanical properties of the h-BN composite ceramics were investigated.The results indicated that La-Al-Si-O liquid phase was formed during sintering process,which provided an environment for the growth of h-BN grains.With increasing sintering temperature,the cristobalite phase precipitation and h-BN grain growth occurred at the same time,which had a significant influence on the densification and mechanical properties of h-BN composite ceramics.The best mechanical properties of BN/La-Al-Si-O composite ceramics were obtained under the sintering temperature of 1700℃.The elastic modulus,flexural strength,and fracture toughness were 80.5 GPa,266.4 MPa,and 3.25 MPa·m^(1/2),respectively. 关 键 词：h-BN matrix composite ceramics La-A1-Si-O glass phase microstructural evolution nanocrystalline precipitation mechanical properties
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