Study On Preparation And Properties Of Transition Metal Oxide Doped Ni-Cr Based Infrared Ceramic Coating

High-temperature infrared radiation material is different from the room temperature infrared radiation material that we often see in our daily life, which focused radiation property in the far infrared wavelength region. the room temperature material were used mainly for textile and food drying and other functions, While the high temperature infrared radiation materials refers to the long serving under the conditions of high temperature, the material itself has a higher request in the near infrared and far infrared band rate.otherwise,it should meet certain performance. Currently, the infrared radiation on materials research focus mainly on the spinel structure materials, the paper mainly studied the structure of these materials for the preparation of high-performance ceramic coatings.In our lab, Cr2O3?NiO is the main component for preparing infrared radiation material, and we have respectively study on the preparation of composite non-metal oxide and made composite materials doped with rare earth. Combined with the results of laboratory experiments in the past, this experiment will continue to use Cr2O3/NiO as the selected materials, discussed the system structure and the influence of additives on the infrared radiation, and prepare a kind of new composite materials with more perfect performance. The experiment was divided into three parts. The first part discuss the material compound each added component effect by adjusting the formula, second part preliminary discuss the effects of Co3O4?MnO2?TiO2 to the materials property of infrared radiation rate. The third part analysis pre experimental result to obtained the compound recipe for excellent performance and do some related experimental study.In this paper, the preparation of coating for the main process: adding some water into the prepared powders to get slurry, after sanding process reduced the original particle size, finally put slurry into the atomizing disk atomization to get composite agglomerated powder in the drying tower under the action of high temperature. after this process and through different temperature treatment section the final powder was successfully made.use the plasma spraying process and powder feeding device to get composite agglomerated powder deposite on the substrate surface to make the high temperature infrared radiation coating.Using the Malvin particle analyzer test slurry particle size distribution range, using FL4-1 Holzer velocity meter to measure powders' Liquidity and bulk density.The combination of the two analysis show that the optimal sanding time range around 45 min. SEM scanning electron microscope shows that roasting process have a certain impact on powders' liquidity. Although the same spherical powder particles, but after roasting the powders' surface has many rugged area. while,by plasma quenching process for preparation, the powder particle become sphericity intact, more compact, and the surface is more smooth, testing results suggest that this processing method is the best way to promote the flow-ability of powders. By using the TG-DSC test method, identified two important temperature for baking powder. 450 C for the first temperature adopted in this experiment, mainly used in adhesive volatile; 1400 C for second temperature points, at this temperature,we can obtained enough spinel structure to meet experimental requirement.The XRD analysis found that : when the raw material is Cr2O3, NiO, Co3O4, MnO2, TiO2 component, a variety of inverse spinel and mixed spinel structure were existed in the coating The results of test from quality inspection center show that infrared emissivity of the coating in the temperature range of 800~1000 were higher than 0.91, the maximum can reach 0.92. The coatings has good thermal stability and better combination of strength.