空位对Sm_2Zr_2O_7陶瓷热膨胀系数的影响  

Effect of Vacancy on Thermal Expansion Coefficient of Sm_2Zr_2O_7 Ceramic

作　　者：徐强[1] 王富耻[1] 朱时珍[1] 张红松[1] 刘玲[1] 万春磊[2] 瞿志学[2] 潘伟[2] 

机构地区：[1]北京理工大学材料科学与工程学院,北京100081 [2]清华大学新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《稀有金属材料与工程》2007年第A02期541-543,共3页Rare Metal Materials and Engineering

基　　金：清华大学新型陶瓷与精细工艺国家重点实验室开放基金(2005年度);装备预研基金项目(9140A12020306BQ0102)资助;北京理工大学优秀青年教师资助计划(2006Y0409)

摘　　要：以ZrO_2、Sm_2O_3和二价氧化物MO粉体(M=Mg,Ca)为原料,采用固相反应合成工艺制备了M_(0.1)Sm_(1.9)Zr_2O_(6.95)陶瓷,混合料在空气气氛中1600℃保温10h进行烧结。利用XRD、SEM和热膨胀仪测试了合成产物的相、微观组织和热膨胀系数,结果表明合成出了单相、微观组织较均匀的M_(0.1)Sm_(1.9)Zr_2O_(6.95)陶瓷,陶瓷的热膨胀系数均比纯Sm_2Zr_2O_7陶瓷要高,分析认为热膨胀系数的提高主要是由于Sm_2Zr_2O_7陶瓷中引入的空位所致。热障涂层陶瓷层材料热膨胀系数的提高有利于延长涂层的寿命。M0.1Sml.gZr2O6.95 ceramics were synthesized by solid phase reaction using ZrO2 powder, Sm2O3 powder and bivalent MO powder （M=Mg, Ca） as starting materials. The compacts made from the mixed powders were sintered into bulks at the temperature of 1600 ℃ for 10 hours in air. The phases of the synthesized bulks were identified by X-ray diffraction （XRD） and the microstructure of the bulks was examined by SEM. The thermal expansion coefficients of the bulks were measured by thermal dilatometer. The results show that M0.1Sml.gZr2O6.95 ceramics with single phase and uniform microstructure were prepared successfully. The thermal expansion coefficient of M0.1Sm1.9Zr2O6.95 ceramic is higher than that of pure Sm2Zr2O7 ceramic due to the introduction of vacancy. The improvement of the thermal expansion coefficient of the ceramic material for thermal barrier coatings is beneficial to the increasing of the service life of coatings.

关 键 词：Sm2Zr2O7陶瓷 固相反应 热膨胀系数 空位 

分 类 号：TQ174.1[化学工程—陶瓷工业]