核壳结构炭/陶复合材料的制备及其性能研究  

Preparation and properties of carbon-based ceramic materials with core-shell structure

作　　者：赵红超[1] 丛国辉 张翊勋 王学灵 刘犇[1,3] 雷世文 张俊鹏[1] 郭全贵[1,3] 刘占军[1,3] Zhao Hong-chao;Cong Guo-hui;Zhang Yi-xun;Wang Xue-ling;Liu Ben;Lei Shi-wen;Zhang Jun-peng;Guo Quan-gui;Liu Zhan-jun(Key Laboratory of Carbon Materials,Institute of Coal Chemistry,Chinese Academy of Sciences,Shanxi Taiyuan 030001,China;State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment,China Nuclear Power Design Co.,Ltd.,Guangdong Shenzhen 518124,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院山西煤炭化学研究所,山西太原030001 [2]中广核工程有限公司核电安全监测技术与设备国家重点实验室,广东深圳518124 [3]中国科学院大学材料科学与光电工程研究中心,北京100049

出　　处：《炭素技术》2023年第4期14-21,共8页Carbon Techniques

摘　　要：以煤沥青为碳源,h-BN、Si_(3)N_(4)和h-BN/Si_(3)N_(4)陶瓷颗粒分别为掺杂中心,经机械搅拌混合后进行半焦化处理,获得具有炭包覆陶瓷颗粒的复合压粉。复合压粉经等静压成型和高温热处理后最终制备出具有核壳结构的炭基陶瓷复合材料(CCM)。研究了陶瓷颗粒类型对CCM性能和微观组织的影响。结果表明,与传统方法制备的CCM相比,炭包覆陶瓷颗粒有利于CCM结构致密均匀,抗弯强度达到72.31 MPa、抗压强度达到168.77 MPa,并且抗氧化性能显著提升。此外,该结构还提高了h-BN/Si_(3)N_(4)在协同作用下形成的陶瓷层的高温抗氧化性,更好地抑制CCM在1400℃下的氧化。High performance carbon-based ceramic materials(CCM)were self-sintered by using green ceramic coke with core-shell structure which was prepared from coal tar pitch as carbon source and ceramic particles(h-BN,Si_(3)_(N)(4)and h-BN/Si_(3)_(N))as doping center by the pressure-assisted semi-carbonization method.The effect of the ceramic types on the properties and microstructure of CCM was also investigated.Results showed that,compared to conventional methods,the core-shell structure can ensure the CCM to have a dense and homogeneous structure and prominent properties such as high bending strength of 72.31 MPa,remarkable compressive strength of 168.77 MPa,and outstanding oxidation resistance.In addition,the high-temperature oxidation resistance of the ceramic layer formed under the synergistic effect of h-BN/Si_(3)_(N)is improved,which can better inhibit its oxidation at 1400℃.

关 键 词：炭/陶复合材料 核壳结构 自烧结 抗氧化 

分 类 号：TB332[一般工业技术—材料科学与工程]