| Summary: | In this paper, preparation and properties of ZrSiO4 coating prepared by pressureless sintering coated carbon/carbon (C/C) composites and the effect of different temperature on coating in 3-5μm and 8-12μm infrared emissivity were studied. The composition and structure of the ZrSiO4 coatings were examined by XRD and SEM that showed the main phase was ZrSiO4. With the addition of mineralizer, ZrSiO4 synthesis rate increased from 68.58% to 83.47%. The anti-oxidant performance of the prepared SiC layer and SiC-ZrSiO4 coating at 1500°C in air for 24h with a mass loss was 1.5% and 0.4%, respectively. In addition, the experimental results indicated that the emissivity of ZrSiO4 coating declined with the decrease of ZrO2, and the infrared emissivity of ZrSiO4 coating in the 3-5μm and 8-14μm wavebands was 0.55 and 0.64 at 50°C, 0.18 and 0.43 at 300°C, 0.35 and 0.74 at 500°C, respectively.
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