Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making composite or hollow article
Patent
1981-10-20
1985-08-13
Gron, Teddy S.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Making composite or hollow article
419 11, 419 14, 419 18, 419 47, 76107A, 76DIG12, 51307, 51309, B22F 500, B22F 706, B21K 520
Patent
active
045349347
ABSTRACT:
A process improvement is disclosed for making diamond wire die compacts of the type which are generally described as an inner polycrystalline diamond mass surrounded by and bonded to a mass of metal bonded carbide, such as cobalt cemented tungsten carbide. It is known to make these dies by high pressure-high temperature processes, typical conditions being 50 kbar and temperatures in excess of 1300.degree. C. The improvement comprises disposing within the reaction sub-assembly (e.g. metal carbide and diamond within a zirconium cup) a set of discs of specific materials in specified arrangements. For example, on one side of the mass of metal carbide and diamond is disposed one disc of a diamond catalyst/solvent and one disc of a refractory metal such as molybdenum, and on the other side are disposed at least two discs of one or more transition metals such as zirconium. These discs are generally placed inside the sub-assembly cup. By means of this process modification, process yields have been significantly improved through decreasing the occurrence of defects in the dies and by decreasing the reaction time.
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General Electric Company
Gron Teddy S.
Little Douglas B.
Schroeder Robert R.
Thexton Matthew A.
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