A bearing device for a turbocharger according to one embodiment of the present invention includes: a rotational shaft; a journal bearing device including a compressor-side journal bearing and a turbine-side journal bearing; a bearing housing including a compressor-side bearing supporting portion, a turbine-side bearing supporting portion, and a bearing housing main body; and a lubricant oil guide member extending along a circumference direction of the rotational shaft, at an outer circumference side of at least one of the compressor-side bearing supporting portion and the turbine-side bearing supporting portion. When a virtual line extending vertically downward from a rotational center CL of the rotational shaft is defined as a reference line VL in a state where an oil discharge port is orientated downward, the lubricant oil guide member extends from the reference line VL along the circumference direction toward each of one side and another side of the reference line VL over a predetermined angle θ about the rotational center CL of the rotational shaft.

A heterogeneous composite consisting of near-nano ceramic clusters dispersed within a ductile matrix. The composite is formed through the high temperature compaction of a starting powder consisting of a core of ceramic nanoparticles held together with metallic binder. This core is clad with a ductile metal such that when the final powder is consolidated, the ductile metal forms a tough, near-zero contiguity matrix. The material is consolidated using any means that will maintain its heterogeneous structure.

The present invention provides a sliding member which enables further reduction of friction and improvement of seizure resistance without deteriorating wear resistance of a sliding surface. The sliding member includes a porous metal base material, and a resin material with which the porous metal base material is impregnated. The sliding member includes an exposed sliding surface. The sliding surface includes a top surface made of the resin material, and a bottom surface made of the porous metal base material. A height from the bottom surface to the top surface is 10 to 30 μm, and the resin material includes fluorine resin.

A heterogeneous composite consisting of near-nano ceramic clusters dispersed within a ductile matrix. The composite is formed through the high temperature compaction of a starting powder consisting of a core of ceramic nanoparticles held together with metallic binder. This core is clad with a ductile metal such that when the final powder is consolidated, the ductile metal forms a tough, near-zero contiguity matrix. The material is consolidated using any means that will maintain its heterogeneous structure.

A sliding member according to an aspect of the present disclosure includes: a sliding member body containing a metal as a main component; and an outer layer laminated directly on a surface of the sliding member body and containing a crosslinked fluorine resin as a main component, and an arithmetic average roughness Ra1 of a surface having a waveform obtained by extracting a frequency component of a region having waviness having a frequency of not lower than 0.1 μm and not higher than 100.0 μm on a surface of the outer layer through fast Fourier transform processing, and performing inverse Fourier transform processing on data of a frequency component of a region having waviness having a frequency of not lower than 0.1 μm and not higher than 10.0 μm out of the extracted frequency component, is not greater than 0.035 μm.

A method for manufacturing a sliding member according to one aspect of the present disclosure is a method for manufacturing a sliding member containing an ethylene-tetrafluoroethylene copolymer as a main component, and comprises processing a material containing an ethylene-tetrafluoroethylene copolymer as a main component, and irradiating a processed body obtained in the processing step with an electron beam.

A sliding member includes a resin overlay layer on a sliding surface side coming into sliding contact with a mating member. The resin overlay layer has a surface roughness parameter Rk satisfying 0.4≤Rk≤1.2, and a surface area ratio S=S2/S1 calculated when an area of an arbitrary measurement field of view is designated by S1 and a surface area of the measurement field of view is designated by S2 satisfies 2.5≤S≤4.5.

A sliding surface, which is formed using metal (SUJ2, palladium etc.) or oxide ceramics (ZrO.sub.2), is made to slide, at a Hertzian contact stress of 1.0 GPa or more in an atmospheric environment containing a hydrogen gas including a minute amount of an alcohol and water, against a slid surface including a PLC film which is a coating formed by an ionization deposition method while applying a low bias voltage. Consequently, it is possible to form, on the sliding surface, a low-friction coating that stably exhibits a significantly low friction coefficient of 10.sup.−4 order (less than 0.001).

An aerator for aerating water comprises a distribution system for distributing air below the water surface and a compressor with an air inlet and at least one air outlet. The compressor is configured to be placed below the water surface. The infiltration of water at the air inlet is prevented by an intake pipe with one open end above the water surface and the other open end has a watertight connection to the compressor. The distribution system has a watertight connection to the air outlet and, due to its nature or by at least one valve, can hold back water. The housing is in thermal contact with the water to cool the compressor. The compressor is a centrifugal compressor that comprises an impeller that is driven by a shaft that it is mounted on air bearings, magnetic bearings or both.

A bearing assembly, such as for a wind turbine or a tidal turbine including a tower and a nacelle, includes a lower part that is attachable to the tower, an upper part that is attachable to the nacelle, a bearing that rotatably couples the lower part to the upper part to allow rotation of the nacelle with respect to the tower, and a brake mechanism configured to selectively prevent relative rotation of the upper part and the lower part. The brake mechanism includes a brake disc and a brake caliper.