Mitsubishi Materials Corporation

Diamet Corporation

Kenji Orito

Koji Hoshino

Ji-bin Yang

Shinichi Ohmori

Tsuneo Maruyama

Yoshinari Ishii

Jyun Katou

Hajime Kouno

Toshiharu Hayashi

Masahiro Wada

Reiko Izumi

Hitoshi Maruyama

Ji-Bin Yang

On an inner peripheral surface of a bearing hole into which a shaft is inserted, concave oil supply surfaces arranged dispersively like separated islands and a sliding surface continuous around the oil supply surfaces to hold an outer peripheral surface of the shaft are formed: a maximum height difference between the sliding surface and the oil supply surfaces is not less than 0.01% and not more than 0.5% of an inner diameter Di of the sliding surface; a surface aperture area ratio of pores at the sliding surface is not more than 10%; a surface aperture area ratio of pores at the oil supply surfaces is more than 10% and less than 40%; and an area of each of the oil supply surfaces is not less than 0.03 mmand not more than 0.2&#xd7;Di(mm).

Oil impregnated sintered bearing and production method thereof

An oil-impregnated sintered bearing comprises a bearing hole. In the bearing, sliding surfaces supporting an outer circumferential surface of a shaft and an oil supply surface whose diameter is larger than that of the sliding surfaces are formed on an inner circumferential surface of the bearing hole into which the shaft is inserted. The sliding surfaces and the oil supply surfaces are adjacent to each other in the axial direction of the bearing hole. A height gap 'd' between the sliding surfaces and the oil supply surface is not less than 0.01% and not more than 15% of an inner diameter of the sliding surfaces. A surface opening percentage of the sliding surfaces is not higher than 10%. A surface opening percentage of the oil supply surface is higher than 10%. An average circle-equivalent diameter of opening parts of pores on the sliding surfaces is not larger than 20 &#x3bc;m.

Oil-impregnated sintered bearing and method for manufacturing the same

This method for producing porous sintered aluminum includes: mixing aluminum powder with a sintering aid powder containing titanium to obtain a raw aluminum mixed powder; mixing the raw aluminum mixed powder with a water-soluble resin binder, water, and a plasticizer containing at least one selected from polyhydric alcohols, ethers, and esters to obtain a viscous composition; drying the viscous composition in a state where air bubbles are mixed therein to obtain a formed object prior to sintering; and heating the formed object prior to sintering in a non-oxidizing atmosphere, wherein when a temperature at which the raw aluminum mixed powder starts to melt is expressed as Tm (&#xb0; C.), a temperature T (&#xb0; C.) of the heating fulfills Tm&#x2212;10 (&#xb0; C.)&#x2266;T&#x2266;685 (&#xb0; C.).

Process for producing porous sintered aluminum, and porous sintered aluminum

This method for producing porous sintered aluminum includes: mixing aluminum powder with a sintering aid powder containing a sintering aid element to obtain a raw aluminum mixed powder; forming the raw aluminum mixed powder into a formed object prior to sintering having pores; and heating the formed object prior to sintering in a non-oxidizing atmosphere to produce porous sintered aluminum, wherein the sintering aid element is titanium, and when a temperature at which the raw aluminum mixed powder starts to melt is expressed as Tm (&#xb0; C.), then a temperature T (&#xb0; C.) of the heating fulfills Tm-10 (&#xb0; C.)&#x2266;T&#x2266;685 (&#xb0; C.).

This method for producing an aluminum composite including porous sintered aluminum, includes: mixing aluminum powder with a sintering aid powder containing either one or both of titanium and titanium hydride to obtain a raw aluminum mixed powder; adding and mixing a water-soluble resin binder, water, a plasticizer containing at least one selected from polyhydric alcohols, ethers, and esters, and a water-insoluble hydrocarbon-based organic solvent containing five to eight carbon atoms into the raw aluminum mixed powder to obtain a viscous composition; shape-forming the viscous composition on an aluminum foil or an aluminum plate and causing the viscous composition to foam to obtain a formed object prior to sintering; and heating the formed object prior to sintering in a non-oxidizing atmosphere to obtain an aluminum composite which includes porous sintered aluminum integrally joined onto the aluminum foil or the aluminum plate, wherein when a temperature at which the raw aluminum mixed powder starts to melt is expressed as Tm (&#xb0; C.), then a temperature T (&#xb0; C.) of the heating fulfills Tm-10 (&#xb0; C.)&#x2266;T&#x2266;685 (&#xb0; C.).

Process for production of aluminum complex comprising sintered porous aluminum body

Porous titanium having a low contact resistance includes porous titanium body, Au, and Ti oxide layer (). Porous titanium includes continuous holes () opening on a surface and being connected to inner holes and a skeleton (). Au adheres to at least an outer skeletal surface () of the porous titanium via diffusion bonding to form a network structure. The Ti oxide layer () is formed in a clearance between adjacent Au cords () of the Au network sticking. The width of an Au cord () of the Au network is 0.3 to 10 &#x3bc;m at least at one position; and the thickness of the Ti oxide layer (), which is formed in the clearance between adjacent Au cords () of the Au network is 30 to 150 nm.

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Niigata, Japan

Kenji Orito