ZrB_2-Si_3N_4高温复相陶瓷的制备及抗氧化机理研究  

Preparation and Resistance Oxidation Mechanism of ZrB_2-Si_3N_4 High-temperature Multi-phase Ceramics

作　　者：宋杰光[1,2] 李世斌[1,2] 纪岗昌[2] 李伟[1] 徐斌[1] 张小强[1] 

机构地区：[1]九江学院机械与材料工程学院,九江332005 [2]九江学院九江市绿色再制造重点实验室,九江332005

出　　处：《材料导报（纳米与新材料专辑）》2010年第2期519-521,528,共4页

基　　金：江西省教育厅青年科学基金项目(GJJ09595);江西省高校省级教改项目(JXJG-09-17-6);九江学院大学生自主创新性实验项目(09XSCXXSY13)

摘　　要：由于ZrB_2具有极高的熔点、强度、硬度和导电率等许多优异性能,因而其应用领域非常广泛。研究了ZrB_2-Si_3N_4复相陶瓷的制备和高温下的氧化机理。结果表明,在1700℃、15MPa、2h烧结条件下制备的ZrB_2-20%Si_3N_4复相陶瓷的致密度为98%左右。ZrB_2-Si_3N_4复相陶瓷在高温氧化时生成了SiO_2,并且SiO_2液相容易在复相陶瓷表面富集形成一层保护膜,有望提高陶瓷在更高氧化温度下的抗氧化性能。ZrB2 is widely applied because of some excellent performances, such as high melting point, strength, hardness and conductivity. Preparation and oxidation mechanism of ZrB2-Si3N4 multi-phase ceramics are researched, which helps to improve the performance of high-temperature and ultra-high-temperature ceramics. The results show that the relativite density of ZrB2-Si3N4 multi-phase ceramics is 98% at 1700℃, 15MPa, 2h. SiO2 is produced from oxidized ZrB2-Si3N4 multi-phase ceramics at high temperature, SiO2 is easily enriched on the ceramic surface to form a protecting layer, which is helpful to increase the antioxygenic property of ZrB2-Si3N4 multi-phase ceramics at higher oxidized temperature.

关 键 词：二硼化锆 氮化硅 复相陶瓷 真空热压烧结 氧化机理 

分 类 号：TQ174.758[化学工程—陶瓷工业]