期刊
CERAMICS INTERNATIONAL
卷 43, 期 1, 页码 222-227出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.09.140
关键词
Ti3SiC2; Al doping; Dielectric property; Microwave absorbing material
资金
- National Natural Science Foundation of China [51602240]
- Natural Science Basic Research Plan in Shaanxi Province of China [2015JQ6252]
- Specialized Research Fund for the Doctoral Program of Higher Education [20130203120016]
- Ningbo Natural Science Foundation [2015A610037, 2016A610029, 2015A610109]
Al-doped Ti3SiC2 powders were synthesized by solid state reaction under a vacuum atmosphere from Ti/Si/TiC powders, with an optimum Al doping content. Results showed that the Ti3SiC2 major phase could be generated at a temperature as low as 1250 degrees C through Al doping, and that the doped powders had a relatively narrow particle size distribution with a good dispersibility. The formation of Ti3Si1-xAlxC2 solid solution was further proved by XPS. The microwave dielectric parameters and reflection loss of the prepared Al-doped Ti3SiC2 samples were determined in the frequency range of 8.2-12.4 GHz. It was found that the sample synthesized at 1350 degrees C showed the high values in both the imaginary part of permittivity epsilon '' and dielectric loss tan delta, which were 4.39-7.32 and 0.57-0.78, respectively. For the microwave absorbing coating with a 2.6 mm thickness of the sample, a better reflection loss of almost below -12 dB was obtained in the whole frequency range of 8.2-12.4 GHz.
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