摘要
综合介绍了CaB6 陶瓷粉末、多晶体和单晶体的制备方法 ,评述了各种方法的基本原理和特点。合成CaB6 粉末最常用的方法为碳化硼法 ,此方法能够以低成本制备较纯的CaB6 粉末 ,但是得到的粉末具有硬团聚现象 ,使CaB6 粉末的烧结有一定的难度。由于CaB6 在高温下具有高的化学活性和低的塑性 ,CaB6 多晶多采用热压烧结的方法在高温高压下制备。单晶的制备主要采用区熔法和熔剂法。区熔法适合于生产大尺寸的CaB6 单晶 ,而铝熔剂法制备的CaB6 单晶尺寸最大为 5mm ,对测定其某些物理性能有一定的局限。对CaB6 陶瓷的应用及国内外研究现状作了简要的概括 。
The preparation technologies of CaB6 powder, polycrystalline and single crystal were reviewed, and the basic principles and characteristics of each method were remarked on. The most popular method for synthesizing CaB6 powder is the boron-carbide method, with which CaB6 powder can be obtained at lower costs. But the prepared powder is a hard agglomerate, which brings difficulties in the sintering process. Because of the high chemical activity and the low plasticity of CaB6 powder, CaB6 polycrystals are usually prepared by the method of hot-press sintering under high pressure and high temperature. For the fabrication of CaB6 single crystals, the floating zone method and the Al-flux method are mainly used. The floating zone method is suitable for the production of single crystal in larger size. The longest dimension of CaB6 single crystal prepared by the Al-flux method is 5 mm only, which limits the testing of some physical properties. At the same time, the application and research development of CaB6 powder are briefly summarized and the future development tendency of CaB6 powder is predicted.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2003年第7期687-691,697,共6页
Journal of The Chinese Ceramic Society
基金
国家科技部科技型中小企业创新基金 ( 1999370 30 2 14 11)
山东省科委国际合作基金 ( 970 0 0 8)资助项目
关键词
六硼化钙
陶瓷
粉末
多晶
单晶
制备
应用
综述
Borides
Calcium compounds
Plasticity
Polycrystals
Powders
Reviews
Single crystals
Sintering
