Effect of additive on microwave absorption properties of hollow ceramic microspheres prepared by Self-propagating High-temperature Synthesis (SHS) flame quenching technology

摘要

In order to improve microwave absorption properties of hollow ceramic microspheres(HC Ms) and possess the better characteristics of "thinness,width,lightness,strongness", used Al+Cr_2O_3 a s the main reaction system, hollow ceramic microspheres were prepared by SHS flame quenching tec hnology. Microwave absorption properties of HCMs were studied when the additive is Fe. The resul ts show that microwave absorption properties of HCMs depend on the dielectric property of product, such as SiC.mullite, when there is no additive. However, when Fe is used as additive, the microwav e absorption properties of HCMs are better. SHS reaction of agglomerate powders is happened in the flame field and SiC, Fe_2O_3, Al_3Fe_5O_(12), Cr_(1.3)Fe_(0.7)O_3, (Fe_(0.6)Cr_(0.4))_2O_3 are synthesized. Except the diele ctric property of SiC, magnetic property of HCMs is possessed due to the ferruginous materials are s ynthesized. So its microwave absorption properties are stronger.