Process for crushing hafnium crystal bar

Details Process for crushing hafnium crystal bar Process for crushing hafnium crystal bar

1989-07-11

1990-08-28

Rosenbaum, Mark

Solid material comminution or disintegration

Processes

With heating or cooling of material

241DIG37, B02C 1912

Patent

active

049518810

ABSTRACT:
A process for crushing a hafnium (Hf) crystal bar comprises the steps of maintaining the Hf crystal bar at an extremely low temperature by holding the crystal bar in contact with a cryogenic refrigerant and crushing the crystal bar at the extremely low temperature by clamping and compressing the crystal bar between nickel (Ni)-base superalloy members. An apparatus for crushing the Hf crystal bar comprises a Ni-base superalloy-made container for containing the cryogenic refrigerant, the container having a bottom portion capable of being selectively opened and closed, a heat insulator for covering the container filled with the cryogenic refrigerant so as to maintain the interior of the container at the extremely low temperature, Ni-base superalloy-made pressing terminals for clamping the Hf crystal bar therebetween in the container, and a pressing device for exerting pressure on the pressing terminals so as to compress and crush the Hf crystal bar.

REFERENCES:
patent: 2892697 (1959-06-01), Davies et al.
patent: 4205964 (1980-06-01), Hill
patent: 4509695 (1985-04-01), Bessman
patent: 4647304 (1987-03-01), Petkovic-Luton et al.
patent: 4771950 (1988-09-01), Coblenz et al.

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