Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1990-10-04
1992-07-14
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
264 62, 264 65, 264 82, 264104, 264122, 264319, 427123, 427314, C04B 3571, C04B 4000, B29C 5900
Patent
active
051300680
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: 4686338 (1987-08-01), Kashiwagi et al.
patent: 4743718 (1988-05-01), Santilli
patent: 4766274 (1988-08-01), Iyer et al.
patent: 4971866 (1990-07-01), Naya et al.
Naya Eizo
Okumura Mitsuhiro
Fiorilla Christopher A.
Lowe James
Mitsubishi Denki & Kabushiki Kaisha
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