Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Heat and pressure simultaneously to effect sintering
Patent
1983-07-01
1986-07-22
Cockeram, Herbert S.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Heat and pressure simultaneously to effect sintering
425 78, B22F 100, B22F 300
Patent
active
046018786
ABSTRACT:
A method and an apparatus for producing moulded blanks by hot-pressing metal powder, preferably spherical metal powder, inside a thin-walled capsule comprising an outer sleeve (2), an insertion sleeve (4) disposed approximately centerally inside the latter, a base (3) and a cover (5), inside which one separable mould (1) of solid material may be inserted. The mould (1) and the two sleeves (2, 4) are dimensioned in such a way that between the inner insertion sleeve (4) and the mould (1) there is formed a mould cavity into which the metal powder may be poured. After the metal powder is poured in, the still open capsule is subjected to a preliminary compression by means of vibration. The capsule is subsequently closed in a gas-tight manner by means of the cover (5). Then the metal powder inside the capsule is subjected to a heat-isostatic pressing at an elevated pressure and an elevated temperature of approximately 1000.degree. to 1200.degree. C. In this way moulding blanks with a very high degree of accuracy are obtained.
REFERENCES:
patent: 3992200 (1976-11-01), Chandhok
patent: 4077109 (1978-03-01), Larson
patent: 4081272 (1978-03-01), Adlenborn
patent: 4094672 (1978-06-01), Fleck et al.
patent: 4104782 (1978-08-01), Veeck et al.
patent: 4501718 (1985-02-01), Bradt
Andersson Torbjorn
Aslund Christer
Cockeram Herbert S.
Nyby Uddeholm Powder AB
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