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Effects of Al particles and thin layer on thermal expansion and conductivity of Al-Y2Mo3O12 cermets |
| Xian-Sheng Liu(刘献省)1, Xiang-Hong Ge(葛向红)2,3, Er-Jun Liang(梁二军)2, Wei-Feng Zhang(张伟风)1 |
1. Henan Key Laboratory of Photovoltaic Materials and Laboratory of Low Dimensional Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, China;
2. School of Physical Science & Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450051, China;
3. Zhongyuan University of Technology, Zhengzhou 450007, China |
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Abstract Low thermal expansion composites are difficult to obtain by using Al with larger positive thermal expansion coefficient (TEC) and the materials with smaller negative TECs. In this investigation, Y2Mo3O12 with larger negative TEC is used to combine with Al to obtain a low thermal expansion composite with high conductivity. The TEC of Al is reduced by 19% for a ratio Al:Y2Mo3O12 of 0.3118. When the mass ratio of Al:Y2Mo3O12 increases to 2.0000, the conductivity of the composite increases so much that a transformation from capacitance to pure resistance appears. The results suggest that Y2Mo3O12 plays a dominant role in the composite for low content of Al (presenting isolate particles), while the content of Al increases enough to contact each other, the composite presents mainly the property of Al. For the effect of high content Al, it is considered that Al is squeezed out of the cermets during the uniaxial pressure process to form a thin layer on the surface.
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Received: 08 May 2017
Revised: 13 July 2017
Accepted manuscript online:
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PACS:
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81.05.Mh
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(Cermets, ceramic and refractory composites)
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65.40.De
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(Thermal expansion; thermomechanical effects)
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72.10.Fk
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(Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect))
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10974183 and 11104252), the Doctoral Fund of the Ministry of Education of China (Grant No. 20114101110003), the Fund for Science & Technology Innovation Team of Zhengzhou, China (Grant No. 112PCXTD337), the Industrial Science and Technology Research Projects of Kaifeng, Henan Province, China (Grant No. 1501049), and the Key Research Projects of Henan Higher Education Institutions, China (Grant No. 18A140014). |
Corresponding Authors:
Er-Jun Liang, Wei-Feng Zhang
E-mail: ejliang@zzu.edu.cn;wfzhang@henu.edu.cn
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Cite this article:
Xian-Sheng Liu(刘献省), Xiang-Hong Ge(葛向红), Er-Jun Liang(梁二军), Wei-Feng Zhang(张伟风) Effects of Al particles and thin layer on thermal expansion and conductivity of Al-Y2Mo3O12 cermets 2017 Chin. Phys. B 26 118101
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