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燃烧法合成高纯度负热膨胀材料ZrW_2O_8粉体
作者:严学华 杨新波 程晓农 付廷波 邱杰 刘红飞  
单位:江苏大学材料科学与工程学院 江苏大学材料科学与工程学院 江苏大学材料科学与工程学院 江苏大学材料科学与工程学院 江苏大学材料科学与工程学院 江苏大学材料科学与工程学院 江苏镇江212013 江苏镇江212013 江苏镇江212013 江苏镇江212013 江苏镇江212013 江苏镇江212013 
关键词:钨酸锆  负热膨胀材料  燃烧合成  热膨胀系数 
分类号:TQ174
出版年,卷(期):页码:2006,34(9):1066-1069
DOI:
摘要:
采用燃烧法在较低温度下成功合成了各向同性的负热膨胀材料ZrW2O8粉体。用X射线衍射、扫描电镜、红外光谱综合分析和研究了反应过程中炉温、硼酸和尿素含量、W6+与Zr4+的摩尔比对合成ZrW2O8纯度的影响。结果表明:燃烧法可以合成高纯度、粒径为0.5μm的ZrW2O8粉体。燃烧法合成高纯ZrW2O8的最佳条件是:炉温为500℃,硼酸的摩尔分数为10%,(NH2)2CO与(NH4)5H5[H2(WO4)6]·H2O+ZrOCl2·8H2O的质量比为2:1,(NH4)5H5[H2(WO4)6]·H2O与ZrOCl2·8H2O的摩尔比为1:3.2。所合成的ZrW2O8在50~700℃之间的线膨胀系数α=-5.08×10-6/℃,其线膨胀系数与温度的关系符合方程dL/L0=-1.4×10-2-4.5×10-4T(50℃≤T≤700℃)。
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Isotropic ZrW2O8 powders material with negative thermal expansion were successfully synthesized via a combustion method at low temperature. The effects of the furnace temperature, the H3BO3 and (NH2)2CO content, and the molar ratio of W6+ and Zr4+ on the purity of the synthesized ZrW2O8 powders were investigated by X-ray diffraction, scanning electron microscopy and infrared spectrum. The results show that high purity ZrW2O8 powders with a mean particle size of 0.5 μm, can be obtained by the method under the follo- wing conditions: a furnace temperature of 500 ℃; a H3BO3 molar fraction of 10%; a 2:1 mass ratio of (NH2)2CO and (NH4)5H5[H2(WO4)6]·H2O added to ZrOCl2·8H2O; and a 1:3.2 molar ratio of (NH4)5H5[H2(WO4)6]·H2O and ZrOCl2·8H2O. The linear thermal expansion coefficient of prepared ZrW2O8 material is -5.08×10-6/℃ in the temperature range from 50℃ to 700℃. The equation for the relationship of thermal expansion to the temperature of the material is dL/L0=-1.4×10-2-4.5×10- 4T.
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基金项目:
国家自然基金(50372027,50442023)资助项目;; 江苏省研究生创新基金资助项目
作者简介:
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参考文献:
[1]MARY T A,EVANS J S O,VOGT T,et al.Negative thermal expansion from0.3to1050Kelvin in ZrW2O8[J].Science,1996,272(5):90-92. [2]EVANS J S O,HU Z,JORGENSEN J D,et al.Compressibility,phase transitions,and oxygen migration in zirconium tungstate,ZrW2O8[J].Science,1997,275(3):61-65. [3]CHANG L L Y,SCORGER M G,PHILIPS B.Condensed phase rela-tions in the systems ZrO2-WO2-WO3and HfO2-WO2-WO3[J].J Am Ceram Soc,1967,50(2):211-215. [4]KAMESWARI U,SLEIGHT A W,EVANS J S O.Rapid synthesis of ZrW2O8and related phases,and structure refinement of ZrWMoO8[J].Int J Inorg Mater,2000,2:333-337. [5]严学华,程晓农,张美芬.不同处理条件对前驱体转变成ZrW2O8的影响[J].硅酸盐学报,2004,32(12):1530-1533.YAN Xuehua,CHENG Xiaonong,ZHANG Meifen.J Chin Ceram Soc(in Chinese),2004,32(12):1530-1533. [6]SLEIGHT A W.Negative thermal expansion material[J].Solid State Mater Sci,1998,3:128-131. [7]CHEN J C,HUANG G C,HU C,et al.Synthesis of nega-tive-thermal-expansion ZrW2O8substrates[J].Scr Mater,2003,49:261-266. [8]沈容,王天民,白海龙,等.共沉淀法合成负热膨胀材料ZrW2O8[J].材料工程,2003,3:3-6.SHEN Rong,WANG Tianmin,BAI Hailong,et al.J Mater Eng(in Chinese),2003,3:3-6. [9]EVANS J S O,MARY T A,VOGT T,et al.Negative thermal expansion in ZrW2O8and HfW2O8[J].Chem Mater,1996,8:2809-2823.
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