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.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
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
