TiB_(2)、CNT双相增韧碳化硼复合陶瓷及其性能研究  

Preparation and Characterization of TiB_(2) and CNT Dual-Phases Toughened B_(4)C Ceramic Composites

作　　者：许森 林文松[1] 张虹 石健强 方宁象 XU Sen;LIN Wensong;ZHANG Hong;SHI Jianqiang;FANG Ningxiang(College of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;Zhejiang Light-Tough Composite Materials Co., Ltd., Huzhou 313219, China)

机构地区：[1]上海工程技术大学材料工程学院,上海201620 [2]浙江立泰复合材料股份有限公司,湖州313219

出　　处：《人工晶体学报》2022年第4期716-722,共7页Journal of Synthetic Crystals

基　　金：装备预研项目(41422010903)。

摘　　要：在1500℃的真空条件下,通过液相渗硅法(liquid silicon infiltration,LSI)制备了碳化硼/二硼化钛-碳纳米管(B_(4)C-TiB_(2)-CNT)陶瓷复合材料,对其成分、形貌、性能和增韧机理进行了分析表征和研究。结果表明:复合材料的主要组成相为B_(12)(C,Si,B)_(3)、SiC和Si。二硼化钛和碳纳米管显著提高了液相渗硅烧结碳化硼陶瓷的力学性能,在TiB_(2)和CNT的添加量分别为10%和0.4%时,复合陶瓷的弯曲强度和断裂韧性达到了(390±18)MPa和(5.38±0.38)MPa·m^(1/2),分别比B_(4)C陶瓷高了31%和53%。本文的研究从片状SiC颗粒和CNT的拔出、TiB_(2)的颗粒增韧以及裂纹的偏转等方面解释了B_(4)C-TiB_(2)-CNT复合材料的增韧机理。B_(4)C-TiB_(2)-CNT ceramic composites were fabricated by the liquid silicon infiltration(LSI)sintering at 1500℃in vacuum.The compositions,morphologies,mechanical properties and toughening mechanism of the fabricated composites were investigated.The results show that the main constituent phases of the composites are B_(12)(C,Si,B)_(3),SiC and Si.The additions of TiB_(2)and CNT significantly improve the mechanical properties of liquid-phase silicon sintered B_(4)C ceramics.The flexural strength and fracture toughness of the composite ceramics reach(390±18)MPa and(5.38±0.38)MPa·m^(1/2) with TiB_(2)and CNT additions of 10%and 0.4%respectively,which are 31%and 53%higher than pure B_(4)C caremics.The toughening mechanisms of B_(4)C-TiB_(2)-CNT ceramic composites are explained by the pullout of plate-like SiC particles and CNT,the particle toughening of TiB_(2) and the deflection of cracks.

关 键 词：碳化硼 液相渗硅法 双相增韧陶瓷 二硼化钛 碳纳米管 陶瓷复合材料 

分 类 号：TQ174[化学工程—陶瓷工业]