在导电陶瓷基体中加入hBN薄片来创制材料性能的各向异性  

Creating anisotropic properties in conductive ceramics by incorporating hBN flakes

作　　者：梁华岳 邹冀 刘晶晶 顾熠涵 季伟 王子涵 王为民 傅正义 Hua-Yue Liang;Ji Zou;Jing-Jing Liu;Yi-Han Gu;Wei Ji;Zi-Han Wang;Wei-Min Wang;Zheng-Yi Fu(Hubei Longzhong Laboratory,Wuhan University of Technology Xiangyang Demonstration Zone,Xiangyang 441000,China;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;Jingdezhen Huaxun Special Ceramics Co.,Ltd.,Jingdezhen 333000,China)

机构地区：[1]Hubei Longzhong Laboratory,Wuhan University of Technology Xiangyang Demonstration Zone,Xiangyang 441000,China [2]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China [3]School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China [4]Jingdezhen Huaxun Special Ceramics Co.,Ltd.,Jingdezhen 333000,China

出　　处：《Science China Materials》2023年第11期4317-4325,共9页中国科学（材料科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(51972243,52022072,52332003,52322207,92060202);the National Key R&D Programmes(2021YFB3701400);Hubei Provincial Natural Science Foundation of China(Distinguished Young Scholars 2022CFA042);the Independent Innovation Projects of Hubei Longzhong Laboratory(2022ZZ-10);Jingdezhen Huaxun Special Ceramics Co.,Ltd;the Key Research and Development Plan of Jiangxi Province(2020ZDYFB0017)。

摘　　要：导电陶瓷的物理性能由连续的导电基体所决定,调控困难.在这项研究中,通过在陶瓷基体中引入hBN薄片,成功实现了导电陶瓷力学和物理性能各向异性的调控.以包含TiN、Al、硼和hBN的混合粉末为原料,通过放电等离子烧结制备了两种hBN含量不同的导电TiB_(2)-AlNhBN陶瓷.在垂直于烧结压力的方向上,TiB_(2)-AlN-60vol%hBN陶瓷在室温下的弯曲强度、断裂韧性、电导率和热导率分别为151±6.34MPa、2.62±0.31MPam^(1/2)、5.3×10^(5)S m^(−1)和77.87Wm^(-1)K^(-1).而在平行于烧结压力的方向上,室温电导率和热导率分别降低到2.0×10^(5)S m^(−1)和32.25Wm^(-1)K^(-1).这些差异是通过在导电基体中加入少量额外排列的hBN薄片而产生的,为材料选择和设计提供了新的机会.Tailoring physical properties in conductive ceramics is difficult,which is dominated by the continuous ceramic matrix.In this study,tunable anisotropic physical and mechanical properties in conductive ceramics were success-fully realized by incorporating hexagonal boron nitride(hBN)flakes in their matrices.Two conductive TiB_(2)-AlN-hBN cera-mics(TAB)with different hBN contents were fabricated by spark plasma sintering using powder mixtures containing TiN,Al,boron and hBN.Perpendicular to the load direction,flexural strength,fracture toughness,electrical conductivity and thermal conductivity of TiB_(2)-AlN-60 vol%hBN compo-sites at room temperature were 151±6.34 MPa,2.62±0.31 MPa m^(1/2),5.3×10^(5)S m^(−1)and 77.87 W m^(−1)K^(−1).Whilst electrical conductivity and thermal conductivity decreased to 2.0×10^(5)S m^(−1)and 32.25 W m^(−1)K^(−1)at the direction parallel to the load.These differences were created just by incorporating small amounts of extra aligned hBN flakes in the conductive matrix,providing new opportunities to material selection and design.

关 键 词：hexagonal boron nitride TEXTURE microstructure mechanical property physical property 

分 类 号：TQ174.1[化学工程—陶瓷工业]