Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making porous product
Patent
1992-10-21
1995-01-03
Walsh, Donald P.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Making porous product
419 11, 419 24, 419 29, 419 53, 75230, 428605, 428607, B22F 100, C22C 2900
Patent
active
053784260
ABSTRACT:
Metal particulates and porous metal media, which have enhanced resistance to undesirable oxidation, and methods of producing the same are provided. The porous metal media comprise sintered metal particulates each typically having a core and a surface and a diameter in the range of 0.25 to 50 micrometers, the particulates comprising at least about 60 wt. % of a base metal including at least one of iron and nickel, at least about 11 wt. % chromium and no more than about 0.03 wt. % carbon. The surfaces of the particulates are enriched with at least one treatment element in an amount and depth sufficient to enhance the resistance of the particulates to undesirable oxidation. The invention also includes a fine metal filter medium formed from sintered metal fibers, which has enhanced resistance to corrosion and/or to high temperature oxidation. A method of enhancing the resistance of a porous metal medium to undesirable oxidation is also provided which includes heating a porous metal medium formed from sintered metal particulates having a diameter in the range of 0.25 to 50 micrometers and a composition comprising (a) at least about 60 wt. % of a base metal including at least one of iron and nickel, (b) at least about 11 wt. % chromium and (c) no more than about 0.03 wt. % carbon, in the presence of a pack composition comprising a treatment element, an activator and a diluent, at a temperature of at least about 700.degree. C.
REFERENCES:
patent: 1365499 (1921-01-01), Kelley
patent: 1677979 (1928-07-01), Mitchell
patent: 1853369 (1932-04-01), Marshall
patent: 2462045 (1942-04-01), Wulff
patent: 2536774 (1951-01-01), Samuel
patent: 3234056 (1966-02-01), Kraft et al.
patent: 3485595 (1969-12-01), Kraft et al.
patent: 4053662 (1977-10-01), Bergez et al.
patent: 4155755 (1979-05-01), Sara
patent: 4562039 (1985-12-01), Koehler
patent: 4613369 (1986-09-01), Koehler
patent: 4698269 (1987-10-01), Narusch, Jr. et al.
patent: 5130166 (1992-07-01), Spencer
patent: 5149360 (1992-09-01), Koehler et al.
Redmond et al., "The Basics of Stainless Steels", Chemical Engineering, Oct. 18, 1982, pp. 79-93.
Kirk-Othmer, "Encyclopedia of Chemical Technology", 3rd ed., John Wiley & Sons (1981), vol. 15, pp. 262-271.
Kirk-Othmer, "Encyclopedia of Chemical Technology", 3rd ed., John Wiley & Sons (1981), vol. 6, pp. 66, 67, 80 & 81.
Burns et al, "Protective Coatings for Metals", 3rd ed., Reinhold Publishing Corp. (1928), pp. 280-285.
A. John Sedriks, "Corrosion of Stainless Steels", John Wiley & Sons (1979), p. 1721.
"Source Book on Stainless Steels", comp. by American Society for Metals, (1976), FIG. 2c.
"Metals Handbook", ed. Taylor Lyman, 1948 edition, American Society for Metals, pp. 705-706.
"Metals Handbook", ed. Lyman et al, 8th ed., American Society for Metals, vol. 2, pp. 492, 493, & 497.
Brosious Sandra L.
Geibel Stephen A.
Hurley John L.
Chi Anthony R.
Pall Corporation
Walsh Donald P.
LandOfFree
Oxidation resistant metal particulates and media and methods of does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Oxidation resistant metal particulates and media and methods of , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Oxidation resistant metal particulates and media and methods of will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2209580