微波烧结Ti(C,N)-WC-Al_(2)O_(3)/Ti(C,N)-WC叠层陶瓷的微观结构和力学性能  

Microstructure and Mechanical Properties of Microwave Sintered Ti(C,N)-WC-Al_(2)O_(3)/Ti(C,N)-WC Laminated Ceramics

作　　者：张广森 季文彬 戴士杰[1] 武星辰 ZHANG Guangsen;JI Wenbin;DAI Shijie;WU Xingchen(State Key Laboratory of Reliability and Intelligence of Electrical Equipment,Hebei University of Technology,School of Mechanical Engineering,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]省部共建电工装备可靠性与智能化国家重点实验室,河北工业大学机械工程学院,天津300401

出　　处：《硅酸盐学报》2022年第12期3212-3221,共10页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(52005154);河北省自然科学基金(E2020202035)。

摘　　要：采用微波烧结方法制备了不同层数和层厚比的Ti(C,N)-WC-Al_(2)O_(3)/Ti(C,N)-WC叠层陶瓷材料。利用有限元方法揭示了残余应力随层数和层厚比的变化规律,研究了层数和层厚比对材料宏观力学性能和微观结构特征的影响。结果表明:与均质材料相比,叠层材料的断裂韧度提高到11.42 MPa·m^(1/2),为均质材料的2.5倍,增韧效果显著,其主要原因是宏观残余压应力和大量微观裂纹偏转的综合作用。叠层材料的断裂模式为一种表层穿晶断裂和基体层沿晶断裂相交替的混合断裂新模式,不仅有利于断裂韧度的增加,也有利于材料整体强度的提高。Ti(C,N)-WC-Al_(2)O_(3)/Ti(C,N)-WC laminated ceramic materials with different layers and layer thickness ratios were prepared via microwave sintering.The variation of residual stress with layer number and layer thickness ratio was revealed by a finite element method,and the effects of layer number and layer thickness ratio on the macro-mechanical properties and micro-structural characteristics of the material were investigated.The results show that compared with the homogeneous material,the fracture toughness of the laminated material increases to 11.42 MPa·m^(1/2),which is 2.5 times greater than that of the homogeneous material,indicating a superior toughening effect.The main reason is a combined effect of macroscopic residual compressive stress and massive microscopic crack deflections.The fracture mode of the laminated material is an effective mixed fracture mode.In such a mode,the transgranular fracture of the surface layer and the intergranular fracture of the matrix layer alternate,which is conducive to the increase of fracture toughness and to the improvement of the overall strength of the material.

关 键 词：微波烧结 碳氮化钛 叠层复合材料 微观结构 力学性能 

分 类 号：TQ174[化学工程—陶瓷工业]