熔盐法合成Pr_(3)Si_(2)C_(2)粉体及其微观结构表征  

Fabrication and Microstructure of Pr_(3)Si_(2)C_(2)Powder Synthesized with Molten Salt Method

作　　者：许洁 余腾 周小兵 代建清[1] 黄庆 XU Jie;YU Teng;ZHOU Xiaobing;DAI Jianqing;HUANG Qing(Kunming University of Science and Technology,Kunming 650000,Yunnan,China;Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315000,Zhejiang,China)

机构地区：[1]昆明理工大学,云南昆明650000 [2]中国科学院宁波材料技术与工程研究所,浙江宁波315000

出　　处：《陶瓷学报》2022年第6期1053-1058,共6页Journal of Ceramics

基　　金：国家自然科学基金(11975296);宁波市自然基金(2021J199)。

摘　　要：Pr_(3)Si_(2)C_(2)是一种新型三元层状结构材料,兼具陶瓷和金属的双重特性。由于稀土元素Pr易氧化,如何实现Pr_(3)Si_(2)C_(2)的可控制备是目前研究的重点之一。以SiC和稀土金属Pr为原料,以NaCl-KCl混合熔盐为反应介质,采用熔盐法制备Pr_(3)Si_(2)C_(2)粉体。研究了反应温度对合成产物的物相组成和微观形貌的影响,结果表明,在850℃氩气保护气氛下熔盐反应5 h,可合成出较纯的Pr_(3)Si_(2)C_(2)粉体,其含氧量为~8 wt.%。熔盐法合成Pr_(3)Si_(2)C_(2)粉体为其陶瓷的制备,以及作为SiC陶瓷低温烧结助剂的应用研究奠定了基础。Pr_(3)Si_(2)C_(2)is a ternary layered structural material,which combines the merits of ceramics and metals.The synthesis of Pr_(3)Si_(2)C_(2)is a critical issue for its applications,since the highly reactive Pr is easily oxidized.The Pr_(3)Si_(2)C_(2)powder was synthesized using a molten salt method through the in-situ reaction between Pr and SiC.Mixed NaCl-KCl molten salt with a molar ratio of 1:1 was used to supply the liquid phase reaction medium and promote the matter transportation.The effects of the molten salt temperature on phase composition and microstructure of the as-obtained Pr_(3)Si_(2)C_(2)powder were studied.The results indicated that the Pr_(3)Si_(2)C_(2)powder with a~8 wt.%oxygen can be obtained at the molten salt temperature of 850℃for 5 h in Ar.The proposed molten salt method for the synthesis of Pr_(3)Si_(2)C_(2)powder can be potentially used for the fabrication of Pr_(3)Si_(2)C_(2)ceramics and sintering additive of SiC ceramics and SiC matrix ceramic composites.

关 键 词：镨硅碳 熔盐法 微观结构 

分 类 号：TQ174.75[化学工程—陶瓷工业]