Effect of Fe<sub>3</sub>P Addition on Magnetic Properties and Structure of Sintered Iron

Węgliński, B.; Kaczmar, J. W.

doi:10.1179/pom.1980.23.4.210

Cited by 33 publications

(31 citation statements)

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“…Pore rounding and coagulation of smaller pores into bigger pores is observed in the microstructure. This may be due to the presence of phosphorous content in the alloy [16]. Large elongated pores as well as small round pores are observed in the microstructures.…”

Section: Resultsmentioning

confidence: 93%

Carbon as a sacrificial alloying element in processing Fe-P soft magnetic alloys

Sharma

Chandra

Misra

2011

Trans Indian Inst Met

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The present investigation deals with designing Fe-P based binary alloy produced by in-house developed powder metallurgical technique based on 'Hot Powder Preform Forging'. Proper soaking of preforms at high temperature (1050 o C) eliminates iron-phosphide eutectic and brings entire phosphorus into solution in iron. Attempting hot forging thereafter completely eliminates hot as well as cold shortness and thereby helps to form these preforms into very thin sheets of 0.5mm. The use of costly hydrogen atmosphere during sintering has been eliminated by use of addition of carbon. The glassy ceramic coating applied over the compact serves as a protective coating to avoid atmospheric oxygen attack over the compact held at high temperature. The alloy so formed was subjected to density examination at various stages. Microstructural study has been carried out to estimate the grain size, volume percentage porosity in the alloy and uniform distribution of phosphorus in iron matrix. Fe-0.07wt% C-0.3wt% P alloy so formed yielded coercivity as low as 0.45 Oe, resistivity as high as 17.4 :cm and total loss as low as 0.176 W/Kg. The alloy which is drawn to thin sheets could find its possible application in manufacturing transformer cores.

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Section: Resultsmentioning

confidence: 93%

Carbon as a sacrificial alloying element in processing Fe-P soft magnetic alloys

Sharma

Chandra

Misra

2011

Trans Indian Inst Met

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“…Thus, with linear interpolation, the maximum solubility of phosphorous in Fe-8.2%Ni is about 2.4 wt% at970 ~ In comparison, it was generally believed that the optimal concentration of phosphorous lay between 0.8 and 1.2 wt% for iron-phosphorus alloys prepared by powder sintering (Ref 1, 2). With a phosphorous concentration of 1.8 wt% or above, essentially all grain boundaries showed secretions of Fe3P ( Ref 3,4). As the phosphorous concentration of the composite powder prepared in this study was much higher than its solubility in the matrix phase, it was expected that different forms of ironnickel phosphides would precipitate after sintering, resulting in deterioration of magnetic properties of the sintered alloy.…”

Section: Methodsmentioning

confidence: 97%

“…The alternative approach to solve this problem is to incorporate a metalloid element into the system to enhance material transfer, but without deterioration of the properties of the sintered alloys. Phosphorous has been added to various iron-base material systems to enhance the sintering rate of iron powder compacts because it is a ferrite stabilizer and forms a eutectic phase with iron at 1048 ~ (Ref [1][2][3][4][5]. Increase of grain size, coagulation of impurities to the grain boundaries, and rounding of pores are the consequences of phosphorous alloying, which in T.-Y.…”

Section: Introductionmentioning

confidence: 99%

“…The drawbacks of the sintered materials are, however, relatively poor and erratic magnetic characteristics due to the existence of a large amount of residual porosity. Different soft magnetic alloys, including iron-silicon, iron-nickel, and ironphosphorus, having intricate geometries are manufactured by this process route (Ref [1][2][3][4][5][6]. Among these soft magnetic materials, fully dense iron-nickel alloys have relatively high initial and maximum permeabilities ( Ref 7).…”

Section: Introductionmentioning

confidence: 99%

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Enhanced sintering of an Fe-Ni-P coated composite powder prepared by electroless nickel plating

Chan

Lin

1997

J. of Materi Eng and Perform

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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 ~ 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 ~ for 30 min yielded a sintered density of 98.6% theoretical and rounded grains having an average grain size of 53 ttm. 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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“…In addition, Weglinski and Kaczmar [16] reported an increase in saturation magnetization from 1.6 to 1.78 T after the addition of 0.8 wt % P to powder metallurgically processed Fe. Gopalan et al [17] observed a high saturation magnetization of 1.9 T in melt spun Fe-P alloy ribbons after magnetic annealing at 673 K. In rapidly quenched Fe-Si alloys, Varga et al [18] noted a saturation magnetization value of 0.6 T for nanocrystalline Fe 67 Si 33 ribbons.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Boronizing on the Magnetization Behaviour of Low Carbon Microalloyed Steels

Çalık¹,

Karakaş²,

Uçar³

et al. 2012

Journal of Magnetics

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The change of saturation magnetization in boronized low carbon microalloyed steels was investigated as a function of boronizing time. Specimens were boronized in an electrical resistance furnace for times ranging from 3 to 9 h at 1123 K. The metallurgical and magnetic properties of the specimens were investigated using optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and vibrating sample magnetometry (VSM). A boride layer with saw-tooth morphology consisting of FeB and Fe 2 B was observed on the surface, its thickness ranged from 63 µm to 140 µm depending on the boronizing time. XRD confirmed the presence of Fe 2 B and FeB on the surface. The saturation magnetization decreased with increasing boronizing time. This decrease was attributed to the increased thickness of the FeB and Fe 2 B phases. Cracks were observed at the FeB/Fe 2 B interfaces of the samples. The number of interfacial cracks increased with increasing boronizing time.

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Effect of Fe₃P Addition on Magnetic Properties and Structure of Sintered Iron

Cited by 33 publications

References 0 publications

Carbon as a sacrificial alloying element in processing Fe-P soft magnetic alloys

Carbon as a sacrificial alloying element in processing Fe-P soft magnetic alloys

Enhanced sintering of an Fe-Ni-P coated composite powder prepared by electroless nickel plating

The Effect of Boronizing on the Magnetization Behaviour of Low Carbon Microalloyed Steels

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Effect of Fe3P Addition on Magnetic Properties and Structure of Sintered Iron

Cited by 33 publications

References 0 publications

Carbon as a sacrificial alloying element in processing Fe-P soft magnetic alloys

Carbon as a sacrificial alloying element in processing Fe-P soft magnetic alloys

Enhanced sintering of an Fe-Ni-P coated composite powder prepared by electroless nickel plating

The Effect of Boronizing on the Magnetization Behaviour of Low Carbon Microalloyed Steels

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Effect of Fe₃P Addition on Magnetic Properties and Structure of Sintered Iron