Toyo Tanso Co., Ltd.

Hitachi, Ltd.

Hiroaki Ogura

Osamu Okada

Toshiaki Sogabe

Toshiaki Yamanaka

Noboru Baba

Tadashi Iizuka

Takashi Matsumoto

Hiroshi Takayasu

Toshiomi Fukuda

Shinichi Ozaki

Shouichi Nakashima

Shinsuke Goda

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]

An oxidation resistant carbon material including a composite material is provided. The composite material is obtained by impregnating a carbon material with a boron oxide and/or a hydrate compound thereof, and baking such carbon material under pressure by inert gas at a temperature of not lower than 1500.degree. C.

Method for producing composite material mainly composed of carbon and

There is provided according to the invention a method for producing a composite material mainly composed of a carbon and boron comprising the steps of impregnating a carbon material with a boron oxide and/or a hydrate compound thereof, and baking such carbon material under pressure by inert gas at a temperature of not lower than 1500.degree. C. A neutron absorbent and an oxidation resistant carbon material both including the composite material are also provided.

A neutron absorbent including a composite material is provided. The composite material is obtained by impregnating a carbon material with a boron oxide and/or a hydrate compound thereof, and baking such carbon material under pressure by inert gas at a temperature of not lower than 1500.degree. C.

There is provided a method for producing a carbon material coated with carbon film comprising the steps of dissolving an aromatic polyamide imide resin in an organic solvent to obtain a solution, applying this solution to a carbon material or impregnating the carbon material with the solution, curing the material at 300 to 400%, and carbonizing and/or graphitizing the material by baking under non-oxidizing atmosphere. There is also provided a carbon material coated with an amorphous carbon film which is a product of thermal decomposition of aromatic polyamide imide.

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Kagawa, Japan

Hiroaki Ogura