Toyo Tanso Co., Ltd.

Hitachi, Ltd.

Toshiomi Fukuda

Toshiaki Yamanaka

Noboru Baba

Tadashi Iizuka

Hiroaki Ogura

Takashi Matsumoto

Hiroshi Takayasu

Yuji Takimoto

Shinichi Ozaki

Shouichi Nakashima

Shin-ichi Ozaki

The object of the present invention is to provide: high-reliability and long-life COrefrigerant compressor-use bearings that uses bearing materials high in wear resistance and in baking resistance, and; such a compressor, air conditioner, refrigerator, and hot-water supply machine that each employ these bearings. The COrefrigerant compressor-use bearings according to the present invention, and the compressor, air conditioner, refrigerator, and hot-water supply machine that employ these bearings, wherein the bearings are characterized in that each bearing comprises a cylindrically shaped member whose graphite-containing carbonaceous base material has pores impregnated with tin or with one type of metal selected from the IB group or the VIII group, except iron, or with an alloy based on these metals, and in that each bearing satisfies at least one of the requirements that the bearing should comprise a carbonaceous base material containing 20 to 50 weight percent graphite, that the Shore hardness of the corresponding member should range from 65 to 120, that the compressive strength of the corresponding member should range from 200 to 500 MPa, that the porosity rate of the corresponding member should range from 0.05 to 2.00 volume percent, and that the metal or alloy contained in the corresponding member should contain at least either vanadium or titanium or both at the rate of 0.2 weight percent or less.

[object Object]

A mechanical seal member formed by applying slurry, in which boron carbide powder and silicon powder are mixed and dispersed onto the entire surface of a carbon material having an average pore radius of at least 1.0 &mgr;m and formed into a hollow tubular or cylindrical product shape and firing the resultant product to form a carbon-silicon carbide composite material extending from the entire surface toward the interior of the product shape and a thin coating, 3 to 30 &mgr;m thick, consisting mainly of silicon carbide and boron carbide and spread on the surface of the composite material. The carbon-silicon carbide composite material is formed uniformly from the surface to the center, because the member is small in size with a section, parallel to the center axis, of up to 7&times;7 mm. A siliconization ratio on the surface of the composite material is 30 to 55% in area ratio. A carbon base material density is at least 1.7 g/cm and after siliconization 2.0 to 2.5 g/cm . A mechanical seal member may be produced by impregnating metal or resin into pores of this carbon-silicon composite material.

Mechanical seal member

Growing community of inventors

Onohara, Japan

Toshiomi Fukuda