Mechanical seal using pore-dispersed material, and pore-disperse

Details Mechanical seal using pore-dispersed material, and pore-disperse Mechanical seal using pore-dispersed material, and pore-disperse

1988-12-15

1990-05-15

Lechert, Jr., Stephen J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75239, 75240, 75241, 75242, 75244, C22C 2904

Patent

active

049254901

ABSTRACT:
A mechanical seal is, at a sliding surface and at its vicinity, formed of a pore-dispersed cemented carbide, so that the lubricating characteristics can be improved and the strength maintained by strictly stipulating the magnitude, shape, and volumetric ratio of the pores, such that pores are contained in an amount of 0.5 to 20 volume %, formed in at least one shape selected from the group of a substantially spherical shape and a substantially cylindrical shape, the pores in the substantially spherical shape having an average diameter of 3 to 20 .mu.m, the pores in the substantially cylindrical shape having an average diameter of 3 to 20 .mu.m and an average length in the range from the average diameter up to 300 .mu.m, and that the pores are prevented from linking to each other to give a length greater than 2 mm.

REFERENCES:
patent: 3999952 (1976-12-01), Kondo et al.
patent: 4000980 (1977-01-01), Morishita et al.
patent: 4082559 (1978-04-01), Mishuku et al.

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