Vacuum switch contact material and method of manufacturing it

Details Vacuum switch contact material and method of manufacturing it Vacuum switch contact material and method of manufacturing it

1992-04-27

1993-07-06

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501126, 427123, 75228, 75232, 200144B, C04B 352, C04B 3510, C04B 3516

Patent

active

052253813

ABSTRACT:
A vacuum switch contact material consists essentially of a mixture of Cu and Cr.sub.x O.sub.y (x=1 to 2, y=0 to 3) wherein Cr.sub.x O.sub.y is in a particulate state, the center part of the particles consists of Cr.sub.2 O.sub.3 (x=2, y=3), and the peripheral part of the particles consists of Cr (x=1, y=0). The Cr.sub.x O.sub.y particles having Cr.sub.2 O.sub.3 central part and Cr periphery can be formed by reducing the surface of Cr.sub.2 O.sub.3 particles. Cu may be infiltrated into the open pores of Cr.sub.x O.sub.y particles after a green compact of Cr.sub.2 O.sub.3 is formed. Alternatively, a mixture of Cr.sub.2 O.sub.y particles and Cu particles may be formed into a green compact, which may then be sintered. Still alternatively, a mixture of Cr.sub.2 O.sub.y particles and Cu particles may be hot-pressed.

REFERENCES:
patent: 3438724 (1969-04-01), Hartford et al.
patent: 4686338 (1987-08-01), Kashiwagi et al.
patent: 4743718 (1988-05-01), Santilli
patent: 4766274 (1988-08-01), Iyer et al.
patent: 4971866 (1990-11-01), Naya et al.

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