Plastic article or earthenware shaping or treating: apparatus – Means utilizing force from explosive or thermic composition
Patent
1991-11-15
1993-09-14
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
Means utilizing force from explosive or thermic composition
422242, 425 77, 425DIG15, 425DIG26, B22F 308
Patent
active
052443680
ABSTRACT:
A high pressure/high temperature piston-cylinder-type apparatus has an electrically insulating diamond or cubic boron nitride coating disposed between one or both movable pistons and the surrounding core to electrically isolate the piston or pistons from the surrounding core. The electrically insulating coating is applied to the exterior surface of one or both of the pistons or, alternately, to the inner surface of the core. Electrically insulated, right circular cylindrical pistons are used at both ends of the apparatus resulting in the ability to uniformly compress reaction charges at high temperatures with a much higher length-to-diameter ratio. A ring of electrical insulating material is alternately mounted at the reaction charge end of each piston, with the remaining exterior surface of each piston coated with a thin, elastically insulating layer.
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