Preparation and Properties of SiC-CNTs/Al2O3-TiO2 Coating

doi:10.3724/SP.J.1077.2011.01187

Abstract

Abstract: CNTs-SiC/Al₂O₃-TiO₂ coatings were prepared by micro-plasma spraying. Microstructure, high temperature oxidation resistance, complex permittivity and absorbing performance of CNTs-SiC/Al₂O₃-TiO₂ coatings were studied. The coatings were density, low porosity. Little oxidation occurred during the spraying process. The phase of β-SiC and C were successfully retained during the plasma spraying process. The high temperature oxidation of CNTs-SiC/Al₂O₃-TiO₂ composite coating is improved compared with that of CNTs. The initial weight loss temperature of CNTs-SiC/Al₂O₃-TiO₂ composite coating is raised to 511℃. The weight loss of the sample heated from 35℃ to 700℃ is 0.71 wt%, while the weight loss of the sample held for 60 min at 700℃ is 0.41wt%. The real parts of complex permittivity of the CNTs-SiC/Al₂O₃-TiO₂ composites decrease from 17.3 to 10.3 with the increasing frequency. And with increasing frequency, the real parts of complex permittivity of the composites decrease from 6.3 to 2.9. This tendency is beneficial for the absorption of the microwave with wide frequency band. The CNTs-SiC/Al₂O₃-TiO₂ coatings have ability of absorbing microwave. The microwave absorbing performance of the coating with thickness of 0.9 mm is pure. However, with the increase of the coating thickness, the microwave absorption properties were enhanced and the minimum reflection loss shifts to low frequency with the increase of the coating thickness.

Key words: micro-plasma spraying, microstructure, high temperature oxidation, electromagnetic property

CLC Number:

TG332

LIU Gu, WANG Liu-Ying, CHEN Gui-Ming, WEI Wan-Ning, HUA Shao-Chun, ZHU Er-Lei. Preparation and Properties of SiC-CNTs/Al₂O₃-TiO₂ Coating[J]. Journal of Inorganic Materials, 2011, 26(11): 1187-1192.

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Preparation and Properties of SiC-CNTs/Al₂O₃-TiO₂ Coating

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