NiFe_2O_4红外高辐射涂层的制备及其热物理性能  

Preparation of NiFe_2O_4 High Infrared Emissivity Coating and Its Thermo-physical Properties

作　　者：于洋[1,2] 于云[2] 张少宗[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200030 [2]中国科学院上海硅酸盐研究所中国科学院特种无机涂层重点实验室,上海200050

出　　处：《硅酸盐学报》2014年第6期798-801,共4页Journal of The Chinese Ceramic Society

摘　　要：采用固相法制备具有反式尖晶石结构的NiFe2O4粉体,将该粉体与硅酸钠水溶液混合制备了高辐射涂层。研究了NiFe2O4粉体的晶相结构、合成过程以及基料粉体的预处理温度、粉体粒径及涂层厚度等因素对NiFe2O4涂层辐射率的影响。结果表明:以Fe2O3和Ni2O3为原料,经过1 200℃高温固相反应可以制得具有高辐射率的反式尖晶石NiFe2O4粉体。制得的涂层辐射率随着NiFe2O4粉体粒径的减小而增加;随着涂层厚度的增加,辐射率呈现出先迅速增大至某一峰值然后缓慢下降,最后趋于某一固定值的变化规律。涂层厚度为0.08mm时红外辐射率最高为0.90。涂层的耐温性能良好。Trans spinel NiFe2O4 powder was prepared by a solid state method,and the powder mixed with sodium silicate solution was prepared as a high emissivity NiFe2 O4 coating.The effects of the crystalline structure of NiFe2 O4 powder,the reaction process,the pretreatment temperature of powder,the particle size distribution of the powder and the coating thickness on the emissivity properties of coating were investigated.The results show that a high emissivity trans spinel NiFe2 O4 powder can be obtained with Fe2 O3 and Ni2 O3 as raw materials by solid phase reaction at 1 200 ℃.The smaller the particle sizes of the filler,the higher the emissivity of the coating will be.The emissivity of coating increases firstly and then slowly decreases with the in crease of the thickness.The coating has the maximum emissivity of 0.90 when the thickness is 0.08 mm.The coating has a superior heat resistance.

关 键 词：镍铁尖晶石 反式尖晶石 红外辐射率 涂层 固相法 

分 类 号：TB332[一般工业技术—材料科学与工程]