Abstract
The Ti3SiC2/glass composite coatings were prepared by atmospheric plasma spraying. There are no evident microcracks between Ti3SiC2 and glass matrix due to low residual stress resulting from the matching CTE of them. The XRD patterns of the as-sprayed Ti3SiC2/glass composite coatings are composed of glass matrix, Ti3SiC2, TiC, and a small amount of Ti5Si3. The short dwell time and quite low oxygen partial pressure in plasma jet flow restrain TiC and Ti5Si3 from further oxidation. Both the real and imaginary part of the complex permittivity increase with rising Ti3SiC2 content. The coating with 25 wt% Ti3SiC2 possesses excellent microwave absorption properties. The minimum reflection loss is −47.7 dB (> 99.99 % absorption) at 10.6 GHz with a thickness of 1.4 mm and the bandwidth (<−5 dB) can be obtained in the frequency range of 8.2–12.4 GHz. The impedance matching and dielectric loss of the coating result in the microwave absorption properties improved. The enhanced microwave absorption performance suggests that the Ti3SiC2/glass coating could be a good candidate for highly efficient microwave absorption material.
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