| The infrared radiation materials received a lot of attention for the excellent emissivity property and had been widely used in many industrial applications such as the energy savings for industrial furnace, bacterium resistance and spacecraft thermal control. The spinel infrared materials showed its priority for its stability in high temperature and high infrared radiant emissivity. We adopt the plasma spraying to fabricate the infrared emissivity coating rather than the brush way which cause a low combining strength, bad thermal shock resistance and is not suitable for long time high efficient work.In this paper, we use the Cr2O3,MnO2 and TiO2 as the main components. By changing the content of MnO2 we can know its influence on the system structure and radiation. The infrared radiation coating are Prepared by Spray-dried process, high-temperature roasting and finally plasma spraying. SEM results showed that the coatings prepared by spraying process have a laminarization and porous structure which improved the thermal shock performance. Meanwhile increased coating surface area which is good to improve the infrared radiation properties. XRD, IR, XPS and infrared radiation properties results show four powders with different MnO2 wt% all produced complex mixture spinels. But from the metal ions in the tetrahedral and octahedral clearance of spinels we can see that with the addition of MnO2 up to 30%, the coating have a biggest lattice distortion and a ionic vibration frequency most favorable to the infrared absorption which causing the maximum infrared radiation. |
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