Abstract
An Fe-8.2 % Ni-6.0 % P powder was prepared by electroless nickel plating on a carbonyl iron powder, where phosphorous appeared as a contaminant of the plating process. Because of the high phosphorous concentration, persistent liquid phase sintering was effective at temperatures higher than 1000 °C. The sintered microstructure was dramatically different from the conventional approaches, where a low concentration of phosphorous was added in the form of Fe3P. Sintering the alloy at a temperature as low as 1050 °C for 30 min yielded a sintered density of 98.6% theoretical and rounded grains having an average grain size of 53 µm. The rounded grains were surrounded by a large volume fraction of intergranular (Fe,Ni)3P phase, arising from the high phosphorous concentration, which slightly deteriorated the magnetic saturation but significantly increased the electrical resistivity of the alloy. Generally speaking, the magnetic saturation of the sintered alloy was improved with respect to the iron-phosphorus, iron-nickel, or iron-silicon alloys fabricated by powder processing.
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P. Lindskog, J. Tengzelius, and S.A. Kvist, Phosphorous as an Alloying Element in Ferrous P/M, Modern Developments in Powder Metallurgy, Vol 10, H.H. Hausner and P.V. Taubenblat, Ed., Metal Powder Industries Federation, 1977, p 97–128
M. Gagne, J.P. Poirier, and Y. Trudel, Designing a Steel Powder for Soft Magnetic Applications, Advances in Powder Metallurgy, Vol 2, E.R. Andreotti and P.J. McGeehan, Ed., Metal Powder Industries Federation, 1990, p 407–420
J. Kaczmar and B. Weglinski, Influence of Processing Parameters on Magnetic Properties of Fe-0.8P Sintered Materials, Powder Metall., Vol 27, 1984, p 9–13
B. Weglinski and J. Kaczmar, Effect of Fe3P Addition on Magnetic Properties of Sintered Iron, Powder Metall., Vol 23, 1980 p210–216
C. Lall, The Effect of Sintering Temperature and Atmosphere on the Soft Magnetic Properties of P/M Materials, Advances in Powder Metallurgy & Paniculate Materials, Vol 3, J.M. Capus and R.M. German, Ed., Metal Powder Industries Federation, 1992, p 129–156
C. Lall and L.W. Baum, High Performance Soft Magnetic Components by Powder Metallurgy and Metal Injection Molding, Modern Developments in Powder Metallurgy, Vol 18, P.U. Gummeson and D.A. Gustafson, Ed., Metal Powder Industries Federation, 1988, p 363–389
C. Lall, Soft Magnetism: Fundamentals for Powder Metallurgy and Metal Injection Molding, Metal Powder Industries Federation, 1992, p 67–70
T.-Y. Chan and S.-T. Lin, Sintering of Elemental Carbonyl Iron and Carbonyl Nickel Powder Mixtures, J. Mater. sci., Vol 32, 1997,p 1963–1967
X. Qu, S. Gowri, and J.A. Lund, Sintering Behavior and Strength of Fe-Si-P Compacts, Int. J. Powder Metall., Vol 27, 1991,p9–13
R.M. German, Liquid Phase Sintering, Plenum Press, 1985, p 84–85, 184–185
Y.H. Chiou and S.T. Lin, Influences of Powder Preparation Routes on the Sintering Behaviour of Doped ZrO2-3 mol%Y2O3, Ceram. Int., Vol 23, 1997, p 171–177
B.V. Nitta, M.H. Morgan, and L. Kinna, Liquid Phase and Vapor Phase Deposition Techniques for Coating Metals on Metallic/Non-Metallic Powders, Advances in Powder Metallurgy & Paniculate Materials, Vol 7, J.M. Capus and R.M. German, Ed., Metal Powder Industries Federation, 1992, p 89–99
C.A. Loto, Electroless Nickel Plating of Iron Powders, J. Met., Vol 39, 1987, p 36–38
W. Riedel, Electroless Nickel Plating, ASM International 1991 p 5–8,40–44
C.J. Smithells and E.A. Brandes, Metal Reference Book, 5th ed., Butterworths, 1977, p 609, 730
H. Baker, Alloy Phase Diagrams, Vol 3, ASM Handbook, ASM International, 1992, p 2.200, 2.313
R.S. Tebble and D.J. Craik, Magnetic Materials, Wiley-Inter-science, 1969, p 102–103
D.R. Lide, CRC Handbook of Chemistry and Physics, 73rd ed., CRC Press, 1992, p 4–66
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Chan, T.Y., Lin, S.T. Enhanced sintering of an Fe-Ni-P coated composite powder prepared by electroless nickel plating. J. of Materi Eng and Perform 6, 628–632 (1997). https://doi.org/10.1007/s11665-997-0056-6
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DOI: https://doi.org/10.1007/s11665-997-0056-6