Er_2W_3O_(12)陶瓷的制备及其负热膨胀性能研究

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英文篇名：Preparation and Negative Thermal Expansion of Er_2W_3O_(12) Ceramics 作者：张志萍 ; 章嘉诚 ; 刘红飞 ; 杨露 ; 陈小兵 英文作者：ZHANG Zhi-ping;ZHANG Jia-cheng;LIU Hong-fei;YANG Lu;CHEN Xiao-bing;Guangling College,Yangzhou University;College of Physics Science and Technology,Yangzhou University; 关键词：钨酸铒 ; 陶瓷 ; 负热膨胀 ; 固相法 英文关键词：Er2W3O12;;ceramic;;negative thermal expansion;;solid state reaction method 中文刊名：GSYT 英文刊名：Bulletin of the Chinese Ceramic Society 机构：扬州大学广陵学院;扬州大学物理科学与技术学院; 出版日期：2017-03-15 出版单位：硅酸盐通报 年：2017 期：v.36;No.246 基金：国家自然科学基金(51602280,51102207);; 江苏省高校自然科学基金面上项目(14KJB430025);; 扬州大学科技创新基金(2010CXJ081) 语种：中文; 页：GSYT201703055 页数：5 CN：03 ISSN：11-5440/TQ 分类号：318-321+331

摘要

以分析纯Er_2O_3和WO_3为原料,采用固相法制备Er_2W_3O_(12)陶瓷,并利用X射线衍射仪(XRD)、场发射扫描电镜(FESEM)和热重分析仪(TG)对其结构组分、断面形貌和吸湿特性进行表征。采用热膨胀仪和变温XRD对Er_2W_3O_(12)陶瓷的负热膨胀特性进行表征。结果表明:在950℃烧结6 h制得的Er_2W_3O_(12)陶瓷结构致密。Er_2W_3O_(12)材料在室温下容易吸湿,在120℃完全失去吸湿水,表现为正交相的Er_2W_3O_(12)陶瓷,具有良好的负热膨胀性能,其在138~700℃的平均热膨胀系数为-7.94×10~(-6)K-1。变温XRD分析发现:Er_2W_3O_(12)陶瓷沿三个晶轴方向均表现为负热膨胀,在100~600℃温度区间内,Er_2W_3O_(12)陶瓷的热膨胀系数为-7.81×10~(-6)K-1。
        Negative thermal expansion Er_2W_3O_(12) ceramics were successfully prepared,using solid state reaction of Er_2O_3 and WO_3 as raw materials. The microstructure,composition and hygroscopicity of the Er_2W_3O_(12) samples were investigated by X-ray diffraction( XRD),field emission scanning electron microscopy( FESEM) and thermogravimetric analysis( TG). The negative thermal expansion of the Er_2W_3O_(12) ceramics was studied using the thermal mechanical analysis( TMA) and high temperature Xray diffraction( HTXRD). Results indicate that the Er_2W_3O_(12) ceramics sintered at 950 ℃ for 6 h are well crystallized. TG analysis shows that Er_2W_3O_(12) is hygroscopic. The dehydration starts at 120 ℃,and the Er_2W_3O_(12) crystals are in orthorhombic structure after dehydration. The orthorhombic Er_2W_3O_(12) ceramics show excellent negative thermal expansion. The thermal expansion coefficient of the orthorhombic Er_2W_3O_(12) ceramics is-7. 94 × 10~(-6)K~(-1) at 138-700 ℃. HTXRD results indicate that the Er_2W_3O_(12) ceramics show negative thermal expansion along three axes,and the average thermal expansion coefficient of the orthorhombic Er_2W_3O_(12) ceramics is calculated to be-7. 81 × 10~(-6)K~(-1) at 100-600 ℃ based on the HTXRD results.

引文

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