摘要
热处理是使玻璃陶瓷获得预定结晶相的关键工序。采用正交试验法研究了热处理制度（核化温度、晶化温度、保温时间）对钡硼硅酸盐玻璃陶瓷晶相结构和显微结构的影响。结果表明：采用一步法（核化、晶化同时进行）和二步法（核化、晶化分开进行）热处理时,样品的主晶相均为Ca Zr Ti2O7-2M,还含有少量Zr O2相。对于两步法,在720℃核化2 h、850℃晶化3 h的条件下,钙钛锆石的晶相含量较高,晶粒为长条状,长约20~30μm。当晶化温度较高（900~950℃）或晶化时间较长（2~3 h）时,都会出现Ca Ti Si O5晶相。各参数对玻璃陶瓷中晶相含量的影响顺序为：晶化温度〉核化温度〉晶化时间〉核化时间。一步法热处理温度变化对样品的晶相组成和显微结构变化较小。
Thermal treatment is a key process for glass-ceramics to obtain expected crystalline phases. In this study, the effects of thermal treatment process （nucleation temperature, crystal growth temperature, annealing time ） on the crystallization and microstructure of barium borosilicate glass-ceramics were mainly investigated by orthogonal testing method. The results show that the main crystalline phase of CaZrTi2O7-2M and a small amount of ZrO： phase were obtained for the samples annealed by both one-step method （nucleation and crystal growth at the same temperatures） and two-step method （nucleation and crystal growth at different temperatures）. For the two-step method, the amount of CaZrTizO7-2M phase is relatively high for the sample which annealed at 720℃ for 2 h and then 850 ℃ for 3 h. The elongated CaZrTizOT-2M grains are about 20-30 μm. CaTiSiO5 phase is observed when the crystal growth temperature is higher （900-950 ℃ ） or the annealing time is longer （2-3 h）. The influence degree of the parameters of the heat treatment process on thermal expansion coefficient was crystallization temperature 〉 nucleation temperature 〉 crystallization time 〉 nucleation time. The thermal treatment temperatures have no significant effects on the crystalline phase and microstructure of samples by one-step method.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2015年第11期3327-3332,共6页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金资助项目(11305135)
关键词
热处理
正交试验
钡硼硅酸盐
玻璃陶瓷
结构
thermal treatment
orthogonal testing
barium borosilicate
glass-ceramics
structure
