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A Comparison of the Magnetic Properties of Hot Repressed and 7.4 g/cm 3 Iron and 0.45% Phosphorus Iron Cores
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Abstract
Atomized iron powder was screened to narrow fractions and annealed. Intermetallic Fe3P powder was blended with the fractions to provide an alloy containing 0.45% phosphorus after sintering. Cores were pressed to a density of 7.4 g/cm3 and sintered at temperatures ranging from 1600°F (870°C) to 2600°F (1430°C) in hydrogen. Magnetic properties were determined from the sintered cores and compared with previous properties measured for iron and hot repressed 0.45% phosphorus iron.
It was found that the induction at any density level was approximately 500 gausses (0.05 teslas) lower than for iron. Remanent magnetization was influenced by the size of the pores. If pores were large, remanent magnetization was 8 K gausses (0.8 teslas) and increased to 12 K gausses (1.2 teslas) as the pores become finer. Both maximum permeability and the coercive force were improved when 0.45% phosphorus was added. The emperical equations developed for iron could be used to predict the properties of the 0.45% phosphorus iron cores. In the case of maximum permeability, the data points for the 0.45% phosphorus iron fall on the upper two sigma line of the equation. The data points for induction and coercive force fall upon the equation for iron. Structure sensitive properties are generally improved because liquid phase sintering occurs in the 0.45% phosphorus alloys causing grain growth and purification to occur at lower sintering temperatures than for iron.
Resistivity is almost double that of iron at equivalent densities, owing to the addition of 0.45% phosphorus. The effect of the porosity on the phosphorus iron is similar to that upon iron.
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Authors
Citation
Moyer, K. and Mickle, G., "A Comparison of the Magnetic Properties of Hot Repressed and 7.4 g/cm3 Iron and 0.45% Phosphorus Iron Cores," SAE Technical Paper 810239, 1981, https://doi.org/10.4271/810239.Also In
References
- Moyer K.H. McDermott M.J. Topolski M.J. Kearney D.F. “Magnetic Properties of Iron Alloys” 1980 International Powder Metallurgy Conference Washington, D. C. June 22-27 Metal Powder Industries Federation and American Powder Metal Institute Princeton, New Jersey
- Tengzelius J. Kvist S. “The Influence of Particle Size and Phosphorus Additions on the Soft Magnetic Properties of Sintered High Purity Atomized Iron Powder” P/M 78 European Symposium on Powder Metallurgy Stockholm, Sweden June 4-8, 1978 II
- Bozorth R.M. “Ferromagnetism” D. Van Nostrand Co., Inc. Princeton, New Jersey 1951 251 253
- Moyer K.H. Kearney D.F. McDermott M.J. “A Comparison of the Magnetic Properties of Hot Repressed Iron and Iron +0.45% Phosphorus Cores” Lab 6-80 May 28 1980
- Moyer K.H. Wisniewski P. Topolski M. Berezin M. “The DC Magnetic Properties of Iron and Iron-Phosphorus Alloys at Saturation” Lab 6-79 May 10 1979