Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Metal and nonmetal in final product
Patent
1980-09-10
1983-08-16
Rutledge, L. Dewayne
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Metal and nonmetal in final product
75208R, 75226, 75242, 75240, 75236, 428547, 428565, 76108A, 419 17, 419 49, B22F 314, B22F 508, B22F 702
Patent
active
043989527
ABSTRACT:
A method is disclosed for forming roller cutters and also for forming cutting teeth for rolling cutter bits, including cutter inserts, cutter teeth formed in place, or formed separately and welded in place, etc., by powder metallurgy as a densified powder metallurgical composite of at least two varying phases, the composite having a substantially continuous mechanical property gradient therethrough. The gradient is from one region having hardness or wear resistant properties to another region having toughness properties. The method comprises:providing a first powder mixture comprising a major proportion by volume of a powdered refractory compound and a minor proportion by volume of a powdered binder metal or alloy. Providing a second powder comprising a powdered binder metal or alloy or a mixture comprising a powdered refractory material and a powdered binder metal or alloy, present in a lesser proportion by volume than in the first powder. Forming the cutter, or cutter teeth or inserts of the first and the second powders. Mixing the powders during or prior to the forming step and introducing into a first region of the mold a mixture having a larger proportion of the first powder relative to the second powder. Changing the relative proportions of the powders and introducing the mixture into a second region of the mold a mixture having a different proportion of the first powder relative to the second powder and a continuous gradient in the relative proportions of the powders between the regions. Densifying the powders into a solid member having a gradient in composition and properties from the first region to the second region.
REFERENCES:
patent: 2275420 (1942-03-01), Clark
patent: 3305923 (1967-02-01), Zimmer
patent: 3697261 (1972-10-01), Jump
patent: 3996047 (1976-12-01), Nayar
patent: 4063939 (1977-12-01), Weaver
patent: 4101712 (1978-07-01), Bomford
patent: 4198233 (1980-04-01), Frehn
patent: 4276788 (1981-07-01), van Nederveen
Caddell Michael J.
Reed Rock Bit Company
Rutledge L. Dewayne
Zimmerman J. J.
LandOfFree
Methods of manufacturing gradient composite metallic structures does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Methods of manufacturing gradient composite metallic structures, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods of manufacturing gradient composite metallic structures will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-812789