Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making composite or hollow article
Patent
1988-02-17
1989-03-07
Lechert, Jr., Stephen J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Making composite or hollow article
419 38, 419 54, 419 55, 164 80, G22F 700
Patent
active
048104620
ABSTRACT:
The method for fabricating a metal body having a flaw of predetermined size and shape located therein comprises placing half of the metal powder required to make the metal body in the die of a press and pressing it to create a flat upper surface thereon. A piece of copper foil is cut to the size and shape of the desired interior crack and placed on the upper surface of the powder and centered in position. The remaining powder is then placed in the die to cover the copper foil. The powder is first cold pressed and removed from the press. The powder metal piece is then sintered in a furnace at a temperature above the melting point of the copper and below the melting point of the metal. It is then removed from the furnace, cooled to room temperature, and placed back in the die and pressed further. This procedure results in an interior flaw or crack. Modified forms of the method involve using a press-sinter-press-sinter cycle with the first sinter being below the melting point of the copper and the second sinter being above the melting point of the copper and below the melting point of the metal.
REFERENCES:
patent: 3996048 (1976-12-01), Fiedler
patent: 4203315 (1980-05-01), View et al.
patent: 4350528 (1982-09-01), Engle
Hsu David K.
Thompson Donald O.
Iowa State University & Research Foundation, Inc.
Lechert Jr. Stephen J.
LandOfFree
Method for fabricating prescribed flaws in the interior of metal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for fabricating prescribed flaws in the interior of metal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for fabricating prescribed flaws in the interior of metal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1667349