Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Powder pretreatment
Patent
1992-07-20
1993-12-21
Walsh, Donald P.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Powder pretreatment
419 35, 419 38, B22F 100
Patent
active
052718913
ABSTRACT:
A polymeric coating material is provided for coating powdered materials and, more particularly, for coating powdered metals formed into parts and sintered, such as to form magnetic cores. The thermoplastic material is polyphenylene oxide which, when properly applied to metal particles to form a magnetic core, is characterized by being sufficiently volatile so as to prevent the formation of contaminants or voids within the sintered article which would be detrimental to the physical properties of the sintered article. Moreover, polyphenylene oxide provides sufficient lubrication and adhesion between adjacent metal particles during an initial compaction process so as to sustain the desired shape of the molded article and maximize metal particle density without the use of additional lubricants, thereby preventing the formation of additional contaminants and/or voids within the resultant sintered article from these lubricants.
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Sands et al., Powder Metallurgy, 1966, pp. 204-217, London: William Clowes and Sons, Ltd.
Gay David E.
Ward Robert W.
Chi Anthony R.
General Motors Corporation
Grove George A.
Hartman Domenica N. S.
Plant Lawrence B.
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