摘要
用平均粒径为0.5μm的α-Al_2O_3及平均粒度为0.7μm的α-Si_3N_4粉制备出具有纳米相弥散的Al_2O_3基复合陶瓷,其弥散相尺度下限为60μm左右。用XRD,SEM,STEM分析了复合陶瓷的物相与结构。性能测定结果表明:1300℃下复合陶瓷的弯曲强度是纯Al_2O_3瓷的2.5倍以上,并在1200℃仍保持460MPa的强度。
Amorphous Si-N ultrafine powder prepared by RF-plasma CVD was converted into Si_3N_4 by heat-treatment. The average particle size of the powder is about 0.7μm. Si_3N_4 and α-Al_2O_3 (average size, 0.5μm) are used to obtain composites of nano-size dispersoid. The size of scattered phase is 60～120nm. XRD, SEM, STEM were used to investigate the composite structure and high temperature performance. It shows that the strength of the composite can be kept up to 1300℃ and the transverse bending strength at 1300℃ is twice as that of Al_2O_3 ceramics.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1992年第5期484-488,共5页
Journal of The Chinese Ceramic Society
关键词
颗粒
断裂
韧性
陶瓷
氧化物
强度
nano-particle
high temperature strength
fracture toughness
bending strength
