Microwave Synthesis Of Fe-Mn-Co-Cu Spinel Oxide For Infrared Radiation Material

Currently the infrared radiation material have been widely used in various fields like construction,kiln,medical and military.In this thesis,Fe-Mn-Co-Cu composite spinel phase infrared radiation material was synthesized by microwave radiation heating technology in a short time on the basis of using the properties of some metal oxides with good absorbing and heating,the infrared emissivity of which is 0.894.At the same time,globular graphite was used as wave assimilation and warm-up carrier,and the spherical graphite was coated through microwave-sol-gel method firstly and then through microwave-coprecipitation method.An infrared composite material with two layers of coated cavities was fabricated after oxidizing the encapsulated spherical graphite,the infrared emissivity of which is 0.92.In this thesis,composite spinel phase infrared radiation materials were synthesized through microwave irradiation by using metal oxides as raw materials.The effects of different ratio of materials,different cooling conditions were studied in this research as well as different firing atmosphere on the infrared radiation performance of composite materials.In the experiment of fabricating an infrared composite with two layers of coated cavities,spherical graphite was used as wave assimilation and warm-up carrier.In the process of first coating spherical graphite with 5SiO2-2Al2O3-2MgO composite film through microwave-sol-gel method,this experiment mainly compares the coverage of the spherical graphite between microwave-sol-gel method and the traditional sol-gel method,and tries to improve the coating effect by changing the hydrolysis of the sol particles in the sol-gel system,which makes the coating becomes more compact and thinner so as to facilitate the coating in the oxidation of graphite separation of the ball;At the same time,in the experiment of preparing the composite spinel phase particles through microwave-coprecipitation method for the second coating of spherical graphite,the spinel precursors with poor absorption performance were fabricated by co-precipitation method.When the surface of the carrier reaches to a certain temperature with the effects of microwave,the heated carrier causes the spinel precursor with poor heating-up performance to generate a spinel phase material with good wave assimilation and heating performance on the surface of the carrier.The new spinelphase material can continue to absorb wave and heating to promote the continuous coverage of material on its surface,forming a uniform secondary spinel phase particles coated layer.After oxidizing at 900 ? for 20 minutes,the graphite in the coating was oxidized and an infrared composite with two layers of coated cavities can be obtained.