堇青石基复合节能涂层的制备与红外辐射性能

Preparation of Cordierite-Based Composite Energy-Saving Coatings and Determination of Their Thermal Shock Resistance and Infrared Radiation Properties

为了制备抗热震性好、红外发射率高的涂料，以Fe2O3MnO2和堇青石粉末为原料高温固相反应合成后，添加Cr2O3制成红外辐射粉末，再在其基础上以硅溶胶为粘结剂配以各种助剂制备红外辐射涂料，采用涂刷工艺在耐火砖表面制备红外辐射涂层。利用热重．差热分析仪（TG—DSC）、X射线衍射仪（XRD）、扫描电镜（SEM）及红外光谱对粉末的热稳定性、物相、形貌、分子结构进行分析，并测试了涂层的红外发射率、抗热震性及附着力。结果表明：30．88％硅溶胶，18．53％水，0．62％聚羧酸钠，0．51％聚丙烯酸钠，0．05％羟乙基纤维素，49．41％红外辐射粉末，制备的红外辐射涂层具有较好的红外辐射性能和抗热震性能，在6-20μm波段内涂层的红外发射率在0．70以上，最高可达0．91，可在1300℃高温下长期使用，涂层与基体的附着力为1级。

Infrared radiation powder material was prepared by solid phase reac-tion of starting materials Fe203,Mn02 and cordierite powders at elevated temperature and then mixed with Cr2 03. As-prepared infrared radiation powder was then adopted to formulate infrared radia-tion paint with silica gel as the adhesive while various auxiliary agents were introduced. Resultant infrared radiation paint was coated onto the surface of firebrick by brush coating to afford infrared radiation coating. The phase, morphology, molecular structure and thermal stability of as-synthesized infrared radiation powder were analyzed, and the infrared emissivity, thermal shock resistance and adhesion force of the infrared radiation coating were also deter-mined. It was found that the infrared radiation coating made from the paint consisting of 30. 88 % silica sol( mass fraction; the same hereafter),18. 53% water, 0. 62% sodium polycarboxylate, 0.51% sodium polyacrylate, 0. 05% hydroxy ethyl cellulose, and49.41 % infrared radiation powder exhibited good infrared radiation performance(its infrared emissivity in the wavelength range of 6~20 fxm was above 0. 70; and its maximum infrared emissivity was 0.91) and thermal shock resistance as well as grade 1 adhesion force to the substrate,and could be used at elevated temperature of 1 300 Tl in a long run.