堇青石-氧化锆红外辐射复合粉体的制备

为获得具有高红外辐射性能的粉体,以堇青石颗粒为基体,采用液相共沉淀法,用氧化锆前驱体包覆堇青石基体,煅烧后得到堇青石-氧化锆红外辐射复合粉体;对制备的复合粉体进行热分析、物相分析及形貌分析,并测试其红外辐射性能。结果表明,利用非均匀形核可将氧化锆前驱体包覆于堇青石颗粒表面,氧化锆结晶温度在800～900℃之间,900℃煅烧后得到的氧化锆晶粒尺寸约为8 nm;当在一定初始溶液浓度范围内改变反应物的用量时,可以控制氧化锆的包覆量并且避免其自发团聚;通过氧化锆纳米颗粒包覆的工艺可以提高堇青石粉体在3～5μm波段的红外辐射性能,当氧化锆包覆质量分数为21.11%时,复合粉体具有最佳的红外辐射性能。

Synthesis and Infrared Radiation Properties of Cordierite-Zirconia Composite Powders

To obtain the powders with high infrared radiation property,the cordierite particles were coated with zirconia precursor by homogeneous precipitation method.After calcination,the cordierite-zirconia infrared radiation composite materials were prepared.The precursor and the product were systematically analyzed by thermal analysis,phase analysis and morphological analysis.The infrared radiation property of the composite materials was also tested.The results show that the zirconia precursor can be deposited on the surface of cordierite particle,and the crystallization temperature of zirconia is in the range of 800～900 ℃.The particle size of zirconia formed after 900 ℃ calcination is about 8 nm.The weight percentage of zirconia in the composite materials can be controlled by changing the amount of starting materials within a certain concentration range,without forming self-aggregation of zirconia particles.The infrared radiation property of cordierite powder in 3～5 μm waveband can be elevated by coating a layer of zirconia nano-particles,and the composite powders with 21.11 % zirconia possesses the optimum infrared radiation property.