Plastic and nonmetallic article shaping or treating: processes – Reactive gas or vapor treatment of work – Work is organic material
Patent
1975-01-27
1976-01-06
White, Robert F.
Plastic and nonmetallic article shaping or treating: processes
Reactive gas or vapor treatment of work
Work is organic material
264111, 264313, 264DIG50, 425405H, B29F 304
Patent
active
039313824
ABSTRACT:
Method for compacting preheated powder bodies in a high pressure isostatic pressure vessel in which a liquid such as water is used as the pressurizing medium. A preheated workpiece is inserted into the vessel which is closed and sealed. The vessel is then rapidly filled with the liquid pressurizing medium while avoiding contact of the medium with the preheated workpiece until the vessel is substantially completely full. The pressure within the vessel is then increased rapidly to a preselected compacting level by continually pumping the liquid pressurizing medium into the vessel. The preselected compacting pressure is in excess of the critical pressure of the liquid pressurizing medium. The rapid increase of pressure within the vessel to a level exceeding the critical pressure minimizes the amount of vapor that is formed in the vessel and reduces heat transfer from the preheated body to the pressurizing system.
In a preferred embodiment, avoidance of contact of the pressurizing medium with the preheated workpiece until the vessel is substantially completely filled is accomplished by the use of a shielding container. Alternative means are disclosed. Means for increasing the temperature of the workpiece after it is inserted into the pressure vessel are disclosed. Means for rapidly reducing the pressure within the vessel and for withdrawing the pressurizing medium are also disclosed.
REFERENCES:
patent: 3551946 (1971-01-01), Backer et al.
patent: 3599281 (1971-08-01), Boyer
patent: 3741755 (1973-06-01), Allen
Balhoff T. E.
Michaelsen Alfred L.
National Forge Company
White Robert F.
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