多孔型热致变色材料表面辐射特性研究

分别采用固相反应法和胶晶模板法制备出了块状和多孔型的钙钛矿锰热致变色材料。研究了不同制备工艺对材料居里温度的影响,探讨了不同掺杂比例、表面粗糙度和表面微结构对材料表面辐射特性的影响。结果表明,由于制备工艺不同,两种不同结构钙钛矿锰材料的居里温度相差较大,但其发射率均随温度升高而增大;而在室温以上,多孔材料的发射率明显比块状材料要大。同时,表面粗糙度对材料表面辐射特性的影响较大。

Investigation on Surface Radiative Properties of Porous Thermochromic Materials

We have successfully prepared bulk and porous perovskite-type manganese thermochromic materials by using solid-state reaction method and colloidal crystal template method,respectively. The effects of preparation methods on Curie temperature,and doping ratio,surface roughness and surface microstructure on radiative properties of the materials are discussed.The results suggest that,the Curie temperatures of the materials with different structures are obviously different from each other,but the emissivity both increases with the increase of temperature.And above room temperature,the emissivity of porous materials is remarkably higher than the bulk ones.Meanwhile, the surface roughness has a great impact on radiative properties of the materials.