Abstract:
Disclosed is a refrigeration circuit-forming member which has a metal surface and is used for a refrigeration circuit in which HFO-1234yf that is a refrigerant configured of molecules having a double bond is used. The metal surface, which comes into contact with the HFO-1234yf, is covered with a coating layer that is not reactive with the HFO-1234yf within the range of temperature at which the HFO-1234yf is used. The coating layer is formed of any of a coating film that is firmly fixed to the metal surface, a coating layer that is formed by adhesion of a specific component added into the lubricant oil, and a coating layer that is formed by modification of the metal surface layer itself that forms the metal surface. Consequently, the chemical instability that is caused when the refrigerant HFO-1234yf comes into contact with the metal can be eliminated.
Abstract:
The present invention relates to novel lubricant additives for improving the tribological properties, novel lubricants containing these additives, processes for the preparation thereof and the use thereof.
Abstract:
The present invention provides a lubricant composition for hot forming which makes it possible to provide lubricity at 80° C. or more without being peeled or washed by the roll cooling water, and which is easily washed under 40° C. without having water resistance. The lubricant composition for hot forming of the present invention comprises: a solid lubricant from 10 to 40% by mass; water-dispersible synthetic resin from 5 to 20% by mass; inorganic acid amine salt from 0.5 to 5% by mass; and water from 45 to 80% by mass.
Abstract:
A method for reducing wear between two surfaces in sliding contact with one another includes introducing nanoparticles between the two surfaces in an amount and having a composition that results in shear lines being generated within at least one agglomerated wear particle that is generated between the two surfaces as a result of the sliding contact, and subjecting the agglomerated wear particles to at least one load, using at least one of the two surfaces, such that the agglomerated wear particles disassemble along the shear lines into multiple smaller wear particles.
Abstract:
A tubular threaded element including a dry protective coating. The coating includes a solid matrix adhering to the substrate in which there are dispersed particles of at least one solid lubricant belonging to one and the same class. The solid matrix is lubricating and has a rheological behaviour of plastic or viscoplastic type. The coating protects the threadings of the threaded elements, used for example in hydrocarbon wells, from corrosion and galling.
Abstract:
Disclosed is a piston (1) for a combustion engine, comprising hub bores (3) that are provided with plain bearing surfaces (5) and are used for accommodating a piston pin. In order to very effectively and inexpensively prevent the piston pin and the hub bores from jamming and wearing off, a self-lubricating coating (6) made of a thermally cured resin which contains embedded solid lubricant particles is applied directly to at least one subarea (Tb) of the plain bearing surfaces by means of rotary atomization.
Abstract:
A manual transmission fluid having a VI greater than 160 and a Brookfield viscosity at −40° C. less than 30,000 cP. It comprises: 1) a base oil (made from a waxy feed) having less than 0.06 wt % aromatics, greater than 5 wt % total molecules with cycloparaffinic functionality, and a ratio of molecules with monocycloparaffinic functionality to molecules with multicycloparaffinic functionality greater than 20; and a manual transmission fluid additive package. In another embodiment, the manual transmission fluid comprises: 1) a base oil having a high VI and a kinematic viscosity at 100° C. greater than 5.5 cSt, 2) less than 0.01 wt % pour point depressant, and 3) a manual transmission fluid additive package. This invention is also directed to a process to make the manual transmission fluid, comprising the steps of hydroisomerization dewaxing, selecting base oil fractions having a high VI, and blending the fractions with an additive package.
Abstract:
A lubricant molded body, which is to be applied to a surface of a photosensitive layer for electrophotography in an image forming apparatus, for example, is composed of at least two kinds of higher fatty acid metallic salts having respectively different carbon numbers. As the higher fatty acid metallic salt that forms lubricant molded body, compounds such as zinc stearate, calcium stearate, barium stearate, aluminum stearate, zinc laurate, calcium laurate, etc. may be recited. The higher fatty acid metallic salts may contain at least one kind of fillers selected from the group consisting of silica, alumina, tungsten disulfide, molybdenum disulfide, graphite fluoride, graphite, boron nitride, polytetrafluoroethylene (PTFE), ethylene tetrafluoroethylene (ETFE), and polyvinylidene fluoride (PVDF).
Abstract:
An object of the present invention is to provide a plain bearing which can be further improved in bearing capability, in particular, anti-seizure property, initial conformability and cavitation resistance. In the present invention, a sliding layer 2 is formed on the surface of a bearing alloy layer 1 formed of a copper-based or aluminum-based alloy, and the sliding layer 2 comprises a resin binder obtained by applying a strong shearing force to a composition comprising a polybenzimidazole resin as main constituent and at least one member selected from the group consisting of a polyamide-imide resin, a polyamide resin and an epoxy resin, to make the composition into a polymer alloy, and 25 to 75 mass % of a solid lubricant. Owing to such a constitution, toughness and strength are imparted to the sliding layer 2 and the anti-seizure property, initial conformability and cavitation resistance can also be improved.
Abstract:
A tubular threaded element including a dry protective coating. The coating includes a solid matrix adhering to the substrate in which are dispersed particles of solid lubricants from at least two classes that are selected to exert a synergistic effect between themselves and with the constituents of the matrix, i.e. coating provides protection against corrosion and against galling of the threadings of threaded elements used in hydrocarbon wells.