BN基复合陶瓷高温力学性能  

High temperature mechanical properties of BN matric composites ceramics

作　　者：田卓[1] 贾德昌[1] 段小明[1] 杨治华[1] 周玉[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,哈尔滨150080

出　　处：《材料科学与工艺》2014年第1期1-6,共6页Materials Science and Technology

基　　金：国家自然科学基金委创新研究群体(51021002);国家杰出青年科学基金资助项目(51225203)

摘　　要：BN陶瓷因SiO2的引入而使材料的力学性能得到了改善,但依旧存在强度低的不足,为此,本研究将通过在基体中引入高强度、高模量的SiAlON相作为增强相来进一步提高材料的力学性能.以BN、SiO2、AlN为原料,采用热压工艺制备出BN基复合陶瓷.通过高温力学性能测试和扫描电镜(SEM)观察,研究了AlN添加量对复合陶瓷高温力学性能和断裂行为的影响.研究表明:复合陶瓷的高温弯曲强度随着温度的升高而呈先升高后降低的趋势,并在1 300℃达到最大值,而强度的升高主要是由于升温过程中内应力的缓解所致.对于添加体积分数5%AlN的复合陶瓷,在1 300℃时其高温弯曲强度达到376.7 MPa,与室温条件下的弯曲强度相比提升了52.5%,当温度升至1 500℃时其高温弯曲强度为272.0 MPa,具有良好的高温力学性能.Using BN,SiO2 ,/kiN as the raw materials, BN matric composites ceramics were fabricated by hot- press sintering. Effects of AlN content on high temperature mechanical properties and fracture behavior were studied. The results showed that the high bending strength increased at first and then decreased with the increase of temperature, and the maximum values reached at 1 300 %. The increase Of strength is due to the internal stress relief. While the composite with 5vo1.% AlN content had a maximum flexural strength of 376.7 MPa at 1 300 ℃, 52.5% higher than that at room temperature. When the temperature rose to 1 500 ℃, the high temperature flexural strength was 272.0 MPa, showing a good high temperature mechanical property.

关 键 词：BN基复合陶瓷 SIALON 高温力学性能 断裂行为 弯曲强度 

分 类 号：TB332[一般工业技术—材料科学与工程]