Zirconia vane for rotary compressors

Details Zirconia vane for rotary compressors Zirconia vane for rotary compressors

1995-03-28

1996-05-14

Freay, Charles

Rotary expansible chamber devices

Specific material

264 56, F01C 2100

Patent

active

055162690

ABSTRACT:
A zirconia vane used in a rotary compressor, the zirconia vane being formed of a partially stabilized zirconia sintered body containing 92 through 98 molar percent of ZrO.sub.2 and being stabilized with Y.sub.2 O.sub.3, zirconia crystals constituting the zirconia sintered body having a mean grain diameter of 0.1 to 0.6 .mu.m and a maximum grain diameter of not greater than 2 .mu.m, the zirconia sintered body having a mean three-point flexural strength of not less than 120 kg/mm.sup.2 measured in conformity with JIS R1601, a surface of the zirconia sintered body in contact with a rotor of the rotary compressor having a first surface roughness in a direction of rotations of the rotor, specified by a ten-point mean roughness Rz, of not greater than 1 .mu.m and a second surface roughness in a direction perpendicular to the direction of rotation of the rotor, specified by the ten-point mean roughness Rz, of not greater than 0.6 .mu.m. The vane is light-weight and has excellent sliding properties to effectively prevent cohesion and seizure in an atmosphere of a coolant of chlorine-free like an HFC.

REFERENCES:
patent: 4360598 (1982-11-01), Otagi et al.
patent: 5358645 (1994-10-01), Hong et al.
patent: 5376466 (1994-12-01), Koyama et al.

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