不同工艺条件下Ca-α-Sialon显微结构的形成与发展  

Microstructural Development of Ca-α-Sialon under Different Processing Conditions

作　　者：李雅文[1] 王佩玲[1] 严东生[1] 程一兵[2] 

机构地区：[1]中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室,上海200050 [2]澳大利亚Monash大学材料工程系

出　　处：《无机材料学报》1999年第6期893-899,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金!59810761327

摘　　要：对高x值Ca－α－Sialon系统（Ca1．8Si6．6Al5．4O1．8N14．2）用无压烧结的方法得到了具有长颗粒形貌的α－Sialon陶瓷．通过SEM观察研究了升温速度和中间保温等工艺因素对材料显微结构的影响规律，并结合反应过程的研究探讨了在Ca－α－Sialon中长颗粒α－Sialon晶粒的成核与生长机理．结果表明，α－Sialon形成过程中较少的晶核数目及较多的液相量容易得到长颗粒的α－Sialon晶粒，并且中间相的形成与溶解会直接影响晶核数目与液相量．Elongated α-Sialon grains were produced in pressureless sintered Ca-α-Sialon ceramics with the composition Ca1.8Si6.6Al5.4O1.8N14.2. The effect of the processing conditions, such as heating rate and middle dwelling, on the microstructure of the material was studied by SEM,along with the discussion on the nucleation and growth mechanism of the elongated α-Sialon grains. It was found that elongated α-Sialon grains are easier to develop with fewer nuclei and abundant liquid phase during sintering, while the formation and redissolution of the middle phase (gehlenite) is directly related to nuclei number and quantity of the liquid phase.

关 键 词：长颗粒 显微结构 SIALON陶瓷 脆性 钙 工艺条件 

分 类 号：TQ174.758[化学工程—陶瓷工业] TQ174.1[化学工程—硅酸盐工业]