Effect of Firing Temperature on the Electromagnetic Properties of Electronic Transformer Cores Developed by Using Nanosized Mn–Zn Ferrite Powders
来源期刊：Acta Metallurgica Sinica2015年第2期
论文作者：Hassan Waqas Ammad Hussain Qureshi Muhammad Shahzad
文章页码：159 - 163
摘 要：Current investigation deals with the effect of grain growth process as a function of sintering temperature on the electromagnetic properties(initial permeability, impedance, and gain) of Mn–Zn ferrite(MZF) cores(toroids). By employing auto combustion process, nanosized [(20 ± 5) nm] MZF powders were synthesized and toroid shape cores were obtained after subsequent calcination and firing(sintering) process. It was observed that the submicron structure(0.5 lm)achieved in the ferrite core sintered at 1,000 °C was gradually transformed into micron size grains by increasing the firing temperature i.e., 1,100, 1,200, and 1,350 °C. The results reveal that MZF core sintered at low temperature(1,000 °C)showed high impedance, low initial permeability, and narrow working frequency range i.e., 3–15 MHz. However, the improvement in initial permeability, sintered density, and operational frequency range(100 k Hz–17 MHz) was observed at high temperature(1,350 °C) firing in the inert environment. This synthesized MZF core is more suitable for miniaturized switch mode power supply applications.
Hassan Waqas，Ammad Hussain Qureshi，Muhammad Shahzad
摘 要：Current investigation deals with the effect of grain growth process as a function of sintering temperature on the electromagnetic properties(initial permeability, impedance, and gain) of Mn–Zn ferrite(MZF) cores(toroids). By employing auto combustion process, nanosized [(20 ± 5) nm] MZF powders were synthesized and toroid shape cores were obtained after subsequent calcination and firing(sintering) process. It was observed that the submicron structure(0.5 lm)achieved in the ferrite core sintered at 1,000 °C was gradually transformed into micron size grains by increasing the firing temperature i.e., 1,100, 1,200, and 1,350 °C. The results reveal that MZF core sintered at low temperature(1,000 °C)showed high impedance, low initial permeability, and narrow working frequency range i.e., 3–15 MHz. However, the improvement in initial permeability, sintered density, and operational frequency range(100 k Hz–17 MHz) was observed at high temperature(1,350 °C) firing in the inert environment. This synthesized MZF core is more suitable for miniaturized switch mode power supply applications.
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