冷冻注凝制备氮化硅陶瓷基耐高温复合材料  

Preparation of High-temperature Resistance Silicon Nitride Ceramic Composite by Freeze Casting

作　　者：余娟丽[1] 李森[2] 吕毅[1] 郭世峰[1] 赵英民[1] 裴雨辰[1] 

机构地区：[1]航天特种材料及工艺技术研究所,北京100074 [2]中国科学院力学研究所高温气体动力学国家重点实验室,北京100190

出　　处：《硅酸盐学报》2015年第6期723-727,共5页Journal of The Chinese Ceramic Society

摘　　要：采用硅溶胶冷冻胶凝陶瓷成型技术制备Si3N4/BAS陶瓷复合材料,分析了硅溶胶冷冻胶凝技术原理和特点,并对Si3N4/BAS陶瓷复合材料性能及微观形貌进行了研究。结果表明:该成型方法所获得的坯体干燥无变形无开裂,收缩率小于1%;陶瓷烧结体密度为2.9 g/cm3时,烧结体抗弯强度、弯曲弹性模量、断裂韧性以及洛氏硬度分别为350 MPa、193GPa、6.2 MPa·m1/2和58。该成型技术实现了陶瓷界多年来对先进陶瓷高效、低成本、原位近净尺寸成型的追求。Si3N4/BAS ceramic composite was prepared by a frozen silicon sol gel method.The principle and characteristics of the frozen silicon sol gel were analyzed.The properties and micro-morphology of Si3N4/BAS ceramic composite were investigated.The results show that there are little cracking and warpage of dried green body,and its shrinkage rate is < 1%.When the density of Si3N4/BAS ceramic sintered body is 2.9 g/cm3,the flexural strength,bending modulus of elasticity,fracture toughness and rockwell hardness are 350 MPa,193 GPa,6.2 MPa·m1/2 and 58,respectively.The in-situ net-shape ceramics forming technology could be a promising method for the preparation of advanced ceramics at a great efficiency ratio.

关 键 词：冷冻 溶胶凝胶 氮化硅 钡长石 复合物 

分 类 号：TB332[一般工业技术—材料科学与工程]