Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By mechanically introducing gas into material
Patent
1988-08-05
1991-01-08
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By mechanically introducing gas into material
264317, 264332, 419 10, 419 49, 419 68, C04B 3564
Patent
active
049833391
ABSTRACT:
The invention relates to a process for shaping a material by isostatic compression at a temperature of at least 1300.degree. C. of a powder of said material in a tight sheath.
The sheath is made from titanium or a titanium alloy and is internally coated with tantalum in such a way that the sheath can be embrittled during hot isostatic compression, by the diffusion of tantalum into the titanium or titanium alloy, in the presence of oxygen. In general, the titanium sheath is coated with tantalum by spraying in the presence of oxygen.
The use of such a sheath makes it possible to avoid the operation of eliminating the sheath chemically or mechanically conventionally necessary in such processes.
REFERENCES:
patent: 3340053 (1967-09-01), Hodge et al.
patent: 3466734 (1969-09-01), Vordahl
patent: 3627521 (1971-12-01), Vordahl
patent: 4007251 (1977-02-01), Isaksson et al.
patent: 4560668 (1985-12-01), Harold et al.
Boncoeur Marcel
Lieven Thierry
Palacio Marc
Commissariat a l''Energie Atomique
Derrington James
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