NiO-Cr_2O_3系红外高发射涂层的制备与研究

Preparation and Characterization of NiO-Cr_2O_3 High-emissivity Coating

以NiO、Cr_2O_3、TiO_2、MnO_2粉末为主要原料并按固定比例混合,采用高温固相焙烧与喷雾干燥方法制备成团聚粉末,经大气等离子喷涂方法制备成红外高发射率涂层。采用XRD、SEM、XPS和红外辐射测试仪分析了焙烧粉体的相结构和元素化学状态,以及涂层的表面微观形貌和红外全波段辐射性能。结果表明,在NiCr_2O_4尖晶石结构中掺入Ti和Mn元素会造成晶格畸变并形成混合尖晶石结构,从而提高材料的红外发射率。在常温下发射率可达0.88,具有较好的红外辐射性能。

The high-emissivity powders were prepared by sold state calcination and spray drying method.The Air Plasma Spraying( APS) was adopted to prepare high-emissivity coating. The X-ray diffraction( XRD),X-ray photoelectron spectrometer( XPS),scanning electron microscopy( SEM) and DS Hemispherical emissivity measurement were used to characterized the coatings. The results showed that the doping of TiO_2 and MnO_2 to NiCr_2O_4 will lead to the lattice distortion improving the emissivity. The incorporation of Mn will lead to the mixed spinel crystal structure. At room temperature,the highest emissivity reached 0. 88.