Fabrication,microstructure,and properties of SiC/Al4SiC4 multiphase ceramics via an in-situ formed liquid phase sintering  

作　　者：Junwen LIU Xiaobing ZHOU Peter TATARKO Qin YUAN Lan ZHANG Hongjie WANG Zhengren HUANG Qing HUANG 

机构地区：[1]State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi’an 710049,China [2]Engineering Laboratory of Advanced Energy Materials,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China [3]Institute of Inorganic Chemistry,Slovakia Academy of Sciences,Dúbravskácesta 9,84536 Bratislava 45,Slovakia

出　　处：《Journal of Advanced Ceramics》2020年第2期193-203,共11页先进陶瓷（英文）

基　　金：This study was supported by the National Natural Science Foundation of China(Grant Nos.11975296 and 51811540402);the Natural Science Foundation of Ningbo City(Grant No.2018A610001).This work was also supported by the Slovak Research and Development Agency under the contract No.APVV-SK-CN-2017-0040.Peter TATARKO gratefully acknowledges the financial support of the project APVV-17-0328.

摘　　要：The SiC/Al4SiC4 composites with the improved mechanical properties and thermal conductivity were fabricated by the in-situ reaction of polycarbosilane(PCS)and Al powders using spark plasma sintering.The addition of 5 wt%yttrium(Y)sintering additive was useful to obtain fully dense samples after sintering at a relatively low temperature of 1650℃,due to the formation of a liquid phase during sintering.The average particle size of the in-situ formed SiC was^300 nm.The fracture toughness(4.9 MPa·m1/2),Vickers hardness(16.3 GPa),and thermal conductivity(15.8 W/(m·K))of the SiC/Al4SiC4 composite sintered at 1650℃were significantly higher than the hardness(13.2 GPa),fracture toughness(2.16 MPa·m1/2),and thermal conductivity(7.8 W/(m·K))of the monolithic Al4SiC4 ceramics.The improved mechanical and thermal properties of the composites were attributed to the high density,fine grain size,as well as the optimized grain boundary structure of the SiC/Al4SiC4 composites.

关 键 词：AL4SIC4 SIC Y3Si2C2 spark plasma sintering 

分 类 号：TQ174.1[化学工程—陶瓷工业]