In-situ ZrB2-hBN ceramics with high strength and low elasticity

作     者：Ji Zou Guo-Jun Zhang Zheng-Yi Fu Ji Zou;Guo-Jun Zhang;Zheng-Yi Fu

作者机构：State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan430070China School of Metallurgy and MaterialsUniversity of BirminghamB152TTBirminghamUK State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsInstitute of Functional MaterialsDonghua UniversityShanghai 201620China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2020年第47卷第13期

页      面：186-193页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported financially by grants from the National Natural Science Foundation of China(NSFC)(No.51972243 and 51521001)。 

主　　题：ZrB2 Reactive sintering Spark plasma sintering Boron nitride containing ceramics Mechanical property 

摘      要：ZrB2 ceramics with various hexagonal BN(hBN)additions up to 37 vol%were reactively densified by spark plasma sintering using powder mixtures containing ZrB2,ZrN and boron.ZrN-boron based additives effectively promoted the densification process,ZrB2 ceramics reached99%relative density at 2000℃and an applied pressure of 60 MPa with only 5 vol%in-situ formed hBN,whereas the relative density of pure ZrB2 was only 91.2%at the same conditions.Increasing thehBN contents,the morphology of hBN grains gradually changed from quasi-spherical to flake dominated,which has substantial influence on their mechanical properties.In-situ ZrB2-10 vol%hBN ceramics demonstrated high flexural strength of 597±22 MPa,relatively low Young’s modulus of 406 GPa and good machinability,especially for the impressively large strain to failure(1.47×10^-3)which is superior to most of their counterparts in the ZrB2 based particulate reinforced ceramics.