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Sc2Mo3O12/ZrO2可控热膨胀复合材料的制备

发表时间:2012-05-15  浏览量:1061  下载量:496
全部作者: 程晓农,朱君君,杨娟
作者单位: 江苏大学材料科学与工程学院
摘 要: 采用固相法成功制备了纯度较高的各向异性负热膨胀材料Sc2Mo3O12. 将ZrO2与Sc2Mo3O12按一定比例混合,在1 000℃烧结10 h,制备Sc2Mo3O12/ZrO2复合材料。通过X射线衍射仪(X-ray diffractometer,XRD)、扫描电子显微镜(scanning electron microscopy,SEM)、能谱仪(energy dispersive spectroscopy,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。结果表明:样品组元为正交相Sc2Mo3O12和单斜相ZrO2;在30~600℃内,Sc2Mo3O12/ZrO2复合材料的热膨胀系数皆线性一致,并且通过改变Sc2Mo3O12的体积分数,其热膨胀系数可以控制为正、负或0. 其中,体积分数50%的Sc2Mo3O12/ZrO2复合材料在30~600℃的平均热膨胀系数为-0.13×10-6℃-1,近似为0.
关 键 词: 无机非金属材料;固相法;Sc2Mo3O12;ZrO2;复合材料;可控热膨胀;负热膨胀
Title: Preparation of Sc2Mo3O12/ZrO2 composites with controllable thermal expansion
Author: CHENG Xiaonong, ZHU Junjun, YANG Juan
Organization: School of Materials Science and Engineering, Jiangsu University
Abstract: Sc2Mo3O12 which exhibits excellent anisotropic negative thermal expansion was synthesized using solid-state reaction. Sc2Mo3O12/ZrO2 composites were prepared by mixing ZrO2 and Sc2Mo3O12 at different volume ratios and sintered at 1 000℃ for 10 h. The crystal structure, fracture surface morphology and thermal expansion properties of the synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and dilatometer. The results indicate that the obtained samples contain only orthorhombic Sc2Mo3O12 and monoclinic ZrO2 phase without other phases. All the thermal expansion properties of Sc2Mo3O12/ZrO2 composites are linear in 30-600℃ and their thermal expansion coefficients can be controlled as positive, negative or even zero by adjusting the volume fraction of Sc2Mo3O12. 50% (volume percentage) Sc2Mo3O12/ZrO2 composite shows almost zero thermal expansion, and its average thermal expansion coefficient is -0.13×10-6℃-1 in 30-600℃.
Key words: non-metallic inorganic material;solid-state reaction; Sc2Mo3O12; ZrO2; composites; controllable thermal expansion; negative thermal expansion
发表期数: 2012年5月第9期
引用格式: 程晓农,朱君君,杨娟. Sc2Mo3O12/ZrO2可控热膨胀复合材料的制备[J]. 中国科技论文在线精品论文,2012,5(9):841-846.
 
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