Zn_(0.9)Mg_(0.1)Al_(2)O_(4)微波导热陶瓷材料的改性研究  

Study on Modification of Zn_(0.9)Mg_(0.1)Al_(2)O_(4)Microwave Thermal Conductive Ceramic Material

作　　者：高鸣阳 李元勋[1] 陈旻澍 陆永成 彭睿 GAO Mingyang;LI Yuanxun;CHEN Minshu;LU Yongcheng;PENG Rui(State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;Reading Academy, Nanjing University of Information Science and Technology, Nanjing 210044, China)

机构地区：[1]电子科技大学电子薄膜与集成器件国家重点实验室,四川成都610054 [2]南京信息工程大学雷丁学院,江苏南京210044

出　　处：《压电与声光》2021年第2期260-264,共5页Piezoelectrics & Acoustooptics

基　　金：江西省创新人才计划基金资助项目;江西国创与电子科技大学联合研发研发中心基金资助项目(H04W190371)。

摘　　要：采用固相反应法烧结制备了具有较高热导率的Zn_(0.9)Mg_(0.1)Al_(2)O_(4)+x%TiO_(2)(质量分数0≤x≤3)微波介质陶瓷,并研究了TiO_(2)对Zn_(0.9)Mg_(0.1)Al_(2)O_(4)陶瓷的晶相、微观形貌、微波介电和导热性能的影响。研究表明,随着TiO_(2)掺杂量增加,Zn_(0.9)Mg_(0.1)Al_(2)O_(4)陶瓷中会出现少量非化学计量数化合物产生的相。同时,掺杂TiO_(2)会促进晶粒生长。这是由于掺杂TiO_(2)促进了烧结反应的进行,同时也抑制了微观晶格紊乱和宏观偏析,使Zn_(0.9)Mg_(0.1)Al_(2)O_(4)陶瓷的介电与导热性能得到提升。结果表明,Zn_(0.9)Mg_(0.1)Al_(2)O_(4)+2%TiO_(2)陶瓷在1500℃烧结时具有最佳的介电与导热性能,介电常数εr=8.57,品质因数与频率之积Q×f=180861 GHz,热导率为19.67 W/(m·K)。The Zn_(0.9)Mg_(0.1)Al_(2)O_(4)+x%TiO_(2)(0≤x≤3)microwave dielectric ceramics with relatively high thermal conductivity were prepared by the solid-phase reaction,and the effect of TiO_(2)on the crystal phase,micromorphology,microwave dielectric properties,and thermal conductivity of the Zn_(0.9)Mg_(0.1)Al_(2)O_(4)ceramics were studied.With the increase in TiO_(2)doping,a small amount of non-stoichiometric compounds appeared in the composite Zn_(0.9)Mg_(0.1)Al_(2)O_(4)ceramics.Meanwhile,TiO_(2)doping promoted the growth of crystal grains,which may due to the doping of TiO_(2)promoted the sintering reactions,and also suppressed the micro lattice disorder and macro segregation,so that the dielectric and thermal conductivity of the Zn_(0.9)Mg_(0.1)Al_(2)O_(4)ceramic can be improved.The results showed that the Zn_(0.9)Mg_(0.1)Al_(2)O_(4)+2%TiO_(2)ceramics exhibited the best performances as sintered at 1500℃with the dielectric constantεr of 8.57,Q×f of 180861 GHz,and thermal conductivity of 19.67 W/(m·K).

关 键 词：热导率 MgAl_(2)O_(4) ZnAl_(2)O_(4) TiO_(2) 介电性能 

分 类 号：TN384[电子电信—物理电子学] TM282[一般工业技术—材料科学与工程]