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化学共沉淀法合成低热膨胀ZrW2O8/ZrO2复合材料
作者单位:(江苏大学 材料科学与工程学院,镇江 212013)
基金项目:国家自然科学基金(50372027, 50442023); 江苏省高校自然科学重大基础研究项目(06KJA43010)
摘    要:采用化学共沉淀法合成前驱体,前驱体经1150℃烧结得到ZrW2O8/ZrO2复合材料。对ZrW2O8/ZrO2前驱体进行傅里叶变换红外光谱、热重-差示扫描量热分析;通过X射线衍射仪(XRD)、扫描电镜(SEM)、能谱仪(EDS)和热膨胀仪对合成样品的晶体结构、断面形貌和热膨胀性能进行表征。研究结果表明:合成的复合材料的组元为α-ZrW2O8和m-ZrO2相,化学均匀性良好且易烧结;随着ZrW2O8质量分数增加,复合材料的热膨胀系数减小,其中26%ZrW2O8/ZrO2复合材料在30~600℃的平均热膨胀系数为-0.5649×10-6K-1,近似为0。 

关 键 词:化学共沉淀法   ZrO2   ZrW2O8   低热膨胀   复合材料
收稿时间:2007-09-26
修稿时间:2008-01-14

Synthesis of Synthesis of ZrW2O8/ZrO2 composites with low thermal expansion using chemical co-precipitation method
Affiliation:(School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China)
Abstract:ZrW2O8/ZrO2 composites were prepared by calcining the precursor synthesized by the chemical co-precipitation method at 1150℃ for 3.5 h. The precursor of ZrW2O8/ZrO2 was studied by Fourier transform infrared spectroscopy(FTIR) and thermogravimetric and differential scanning calorimetry(TG-DSC). The crystal structure,section morphology and thermal expansion properties of the synthesized composites were investigated by X-ray diffraction (XRD),scanning electron microscopy (SEM),energy dispersive spectrometer(EDS) and dilatometry. The results indicate that the obtained composites contain only α-ZrW2O8 phase and m-ZrO2 phase without other phases,which have good chemical uniform and sintering ability. The average thermal expansion coefficient of ZrW2O8/ZrO2 composites decreases with the increase of mass fraction ofZrW2O8. Among all the samples,26%ZrW2O8/ZrO2 composites exhibit nearly zero thermal expansion,and the average thermal expansion coefficient is -0.5649 10-6K-1 from 30℃ to 600℃.
Keywords:chemical co-precipitation; zirconium dioxide; zirconium tungstate; low thermal expansion; composites
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