CAJ | 학술논문

采用常压烧结工艺制备莫来石/SiC-Si3N4复相陶瓷。采用X射线衍射和环境扫描电镜等对复相陶瓷进行结构分析，测试陶瓷样品的体积密度、开孔率、线收缩率和力学性能。研究结果表明：不同温度下烧结得到的陶瓷主晶相均为莫来石。随烧结温度升高，陶瓷的晶粒长大，内部形成较多闭孔隙，体积密度和线收缩率增大，开孔率减小，显微硬度显著下降，抗弯强度和抗压强度明显提高，其最高分别达到110 MPa和193 MPa。1600℃烧结的陶瓷样品，随陶瓷中Al2O3和SiO2摩尔比(1：1、11：9、3：2)的增大，体积密度和显微硬度升高，抗压强度增大，气孔变小。
채용상압소결공예제비막래석/SiC-Si3N4복상도자。채용X사선연사화배경소묘전경등대복상도자진행결구분석，측시도자양품적체적밀도、개공솔、선수축솔화역학성능。연구결과표명：불동온도하소결득도적도자주정상균위막래석。수소결온도승고，도자적정립장대，내부형성교다폐공극，체적밀도화선수축솔증대，개공솔감소，현미경도현저하강，항만강도화항압강도명현제고，기최고분별체도110 MPa화193 MPa。1600℃소결적도자양품，수도자중Al2O3화SiO2마이비(1：1、11：9、3：2)적증대，체적밀도화현미경도승고，항압강도증대，기공변소。
The mullite/SiC-Si3N4 multiphase ceramics were fabricated by pressureless sintering. The multiphase ceramics were analyzed by the X-ray diffraction and environmental scanning electron microscopy; meanwhile the bulk density, apparent porosity, linear shrinkage and mechanical properties of the obtained ceramics were also characterized. The results show that the main phase of the obtained ceramics is mullite after sintering at different temperatures. With increasing sintering temperature, the grain size increases, the ceramics form more close porosity, the bulk density and linear shrinkage increase, the apparent porosity decreases, the microhardness decreases significantly, the bending strength and compressive strength are improved obviously with the maximum values of 110 MPa and 193 MPa, respectively. For the ceramic sintered at 1 600℃, with the composition of the molar ratio increasing by the order of n(Al2O3):n(SiO2)=1:1, 11:9, 3:2, the bulk density, microhardness and compressive strength increase, the pore size decreases.