Effect of Firing Temperature on the Electromagnetic Properties of Electronic Transformer Cores Developed by Using Nanosized Mn-Zn Ferrite Powders

doi:10.1007/s40195-014-0180-x

Abstract

Abstract:

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 µm) 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 kHz-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.

Key words: Mn-Zn ferrites, Nanosized powders, Impedance, Sintering

Hassan Waqas, Ammad Hussain Qureshi, Muhammad Shahzad. Effect of Firing Temperature on the Electromagnetic Properties of Electronic Transformer Cores Developed by Using Nanosized Mn-Zn Ferrite Powders[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(2): 159-163.

Figures/Tables 9

Fig. 1 XRD patterns of MZF composition sintered at 1,000, 1,100, 1,200, and 1,350 °C

Fig. 2 Microstructures development in MZF cores at different sintering temperatures: a 1,000 °C; b 1,100 °C; c 1,200 °C; d 1,350 °C

Fig. 3 Grain size and sintered density of MZF cores as a function of sintering temperature

Fig. 4 Dimensions of slim size MZF cores obtained after sintering at 1,350 °C

Fig. 5 Initial permeability curves of MZF cores sintered at different temperatures

Fig. 6 The grain growth development (nano to micro size) in MZF cores as a function of sintering temperature and its effect on magnetic induction

Fig. 7 Impedance trend of MZF cores sintered at different temperatures

Table 1 The impedance and the resonance frequency of MZF cores sintered at different temperatures

Sintering temperature (°C)	Impedance	Resonance frequency (MHz)
1,000	395	64
1,100	350	62
1,200	303	62
1,350	251	54

Fig. 8 Frequency-gain curves of MZF cores sintered at different temperatures

References 25

[1]	P. Hu, H. Yang, D. Pan, H. Wang, J. Tian, S. Zhang, X. Wang, A.A. Volinsky, J Magn. Magn. Mater. 322, 173(2010)
[2]	C. Fanga, M. Zhang, J. Mater. Chem. 19, 6258(2009)
[3]	C.B. Andujarab, L. Tungc, N.T.K. Thanh, Annu. Rep. Prog. Chem. A. 106, 553(2010)
[4]	T.D. Schladt, K. Schneider, H. Schild, W. Tremel,Dalton Trans. 40, 6315(2011)
[5]	M. Lin, J. Huang, J. Zhang, L. Wang, W. Xiao, H. Yu, Y. Li, H. Li, C. Yuan, X. Hou, H. Zhang, D. Zhang, Nanoscale 5, 991 (2013)
[6]	P.A. Mangrulkar, V. Polshettiwar, N.K. Labhsetwar, R.S. Varmac, S.S. Rayalu, Nanoscale 4, 5202 (2012)
[7]	K. Singh, A. Ohlan, V.H. Pham, R. Balasubramaniyan, S. Varshney, J. Jang, S.H. Hur, W.M. Choi, M. Kumar, S.K. Dhawan, B.S. Kong, J.S. Chung, Nanoscale 5, 2411 (2013)
[8]	W. Zhu, L. Wang, R. Zhao, J. Ren, G. Lu, Y. Wang, Nanoscale 3, 2862 (2011)
[9]	Ö. Yavuz, M.K. Ram, M. Aldissi, P. Poddar, S. Hariharan, J. Mater. Chem. 15, 810(2005)
[10]	O. Pascua, S. Marre, C. Aymonier, A. Roig, Nanoscale 5, 2126 (2013)
[11]	J. Hao, W. Yang, Z. Zhang, S. Pan, B. Lu, X. Ke, B. Zhang, J. Tang, Nanoscale 5, 3078 (2013)
[12]	Y.Y. Gu, X.P. Tan, S.Q. Liang, S.B. Sang,J. Central South Univ. Technol. 11, 166(2004)
[13]	K. Ono, S. Fukunaga, Y. Matsuo,IEEE Trans. Magn. 35, 3406(1999)
[14]	K. Jiang, K. Li, C. Peng, Y. Zhu, J. Alloys Compd. 541, 472(2012)
[15]	N.S. Mitrović, S.R. Djukić, S. Randjić, Z. Ristanović, H. Danninger,Sci. Sinter. 44, 355(2012)
[16]	S.P. Dalawai, A.B. Gadkari, T.J. Shinde, P.N. Vasambekar,Adv. Mater. Lett. 4, 586(2013)
[17]	S. Choudhury, M.A. Bhuiyan, S.M. Hoque,Int. Nano Lett. 2, 6(2012)
[18]	H. Waqas, A.H. Qureshi, J. Therm. Anal. Calorim. 100, 529(2010)
[19]	H. Waqas, A.H. Qureshi, J. Therm. Anal. Calorim. 98, 355(2009)
[20]	H. Waqas, A.H. Qureshi, K. Subhan, M. Shahzad,Ceram. Int. 38, 1235(2012)
[21]	K. Choi, N.M. Hwang, D.Y. Kim, J. Am. Ceram. Soc. 85, 2313(2002)
[22]	N. Rezlescu, E. Rezlescu, J. Am. Ceram. Soc. 79, 2105 (1996)
[23]	K.K. Bharathi, G. Markandeyulu, C.V. Ramana, J. Electrochem. Soc. 158, G71(2011)
[24]	E.V. Gopalan, K.A. Malini, S. Saravanan, D.S. Kumar, Y. Yoshida, M.R. Anantharaman, J. Phys. D. 41, 185005(2008)
[25]	W.H. Jeong, Y.H. Han, B.M. Song, J. Appl. Phys. 91, 506(2002)