| Summary: | 碩士 === 明新科技大學 === 化學工程與材料科技系 === 99 === The application of microwave-absorbing composite especially the ferrite occupies the most important field. Commercial use the electromagnetic interference (EMI) shielding and the microwave darkroom such as electronic products can be applied extensively. In recent years, many types of high absorption efficiency of electromagnetic wave absorber is the value of continuing research development, and has been noticed by which direction to this research project ,in mainly for its light weight, low cost and flexible. In this study, the combustion synthesis of nickel cobalt ferrite (NiCoFe2O4) of different heat treatment conditions of synthesis and properties of materials. To compose the nano powder of ferrite and uniformly mixed in the thermoplastic polyurethane (TPU) by Combustion Synthesis are fabricated the microwave-absorbing composite. Detection and analysis of material properties by XRD, VSM and Network Analyzer,. The results showed that the sintering temperature of 500 ℃, the soft magnetic properties increase with sintering time. The XRD patterns shows the powder at heat treatment temperature of 1000 ℃ have better crystalline, Therefore, in a low magnetic field strengths can reach the saturation magnetization , soft magnetic properties is also increasingly obvious. In the different sintering time, the maximum reflection loss increases with the heat treatment time move to low-frequency. In the different sintering temperatures, the maximum reflection loss increases with the heat treatment temperature move to high-frequency. In the proportion of different components, with the increase in nickel content the maximum reflection loss move to high-frequency.
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