Plastic article or earthenware shaping or treating: apparatus – Means to create a vacuum or apply fluid pressure within a... – Isostatic type
Patent
1986-12-04
1988-03-22
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Means to create a vacuum or apply fluid pressure within a...
Isostatic type
148402, 419 49, 425 78, B30B 1200
Patent
active
047325569
ABSTRACT:
An apparatus using a shape memory alloy such as nickel-titanium as a reaction vessel for self-sustaining combustion (SSC) reaction synthesis of ceramics, intermetallics, metal or ceramic matrix composites and the like and as a die material for pseudo-isostatic hot pressing by providing a uniaxial mechanical press to density the reaction products with or without the use of pressure transmitting powder. The process can also be used to perform thermal mechanical work on any article synthesized by the self-sustaining combustion reaction to obtain near net shape. With controlled thermal mechanical processing and fabrication of the shape memory alloy into a die configuration, its shape can be changed from a low temperature configuration to a high temperature configuration after being heated. The shape transformation temperature for nickel-titanium alloy in particular, ranges from about -200 degrees Centigrade to +100 degrees Centigrade depending primarily upon alloy composition. For a hollowed cylindrical die made from nickel-titanium alloy which possesses shape memory effect, the inner diameter of the die can change as much as 8% and exert tens of thousands of pounds per square inch pressure in the radial direction. As a result, densified near net shape parts synthesized by SSC, can be produced and pressed pseudo-isostatically without using an expensive and sophisticated press apparatus of the prior art.
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"55-Nitinol-The Alloy with a Memory" , A Report, NASA-SP5110, C. M. Jackson et al., 1972, pp. 77-79.
Chiang Tien-Hon
Thatcher Donald N.
Aerojet-General Corporation
Fortenberry J.
Tachner Leonard
Woo Jay H.
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