It is to provide a lubricating oil composition for a compression refrigerator, which is excellent in the thermal/chemical stability even when used in a compression refrigerator that uses a saturated fluorinated hydrocarbon refrigerant having a lower global warming potential and a fewer carbon atoms, by including in a base oil an organic compound having a double bond in a molecule, which is at least one kind selected from an organic compound having at least two non-conjugated double bonds in the molecule, a terpene compound having a double bond in the molecule, and C.sub.12 to C.sub.30 aliphatic unsaturated hydrocarbon having one double bond in the molecule.

A lubricant composition includes a base lubricant and a plurality of lubricant additive molecules. Each molecule includes a surface active group attractable to a target surface, wherein the surface active group comprises a carboxyl group, a siloxyl group, an amine group, or a mixture thereof, and a carbon containing component connected to the surface active group, wherein the carbon containing component comprises a carbon ring, wherein the surface active group and the carbon containing component are adapted such that the carbon film is formed in situ on the target surface of the target machine only when tribological energy activates the lubricant additive to unravel the carbon containing component under a pressure and a temperature during operation.

Polymers used as rolling lubricating agents, to compositions including said polymers, and to alkali metal films including the polymers or compositions on the surface(s) thereof. The use of said polymers and compositions is also described for strip-rolling alkali metals or alloys thereof in order to obtain thin films. Methods for producing said thin films, which are suitable for use in electrochemical cells, are also described. An improved lubricant according to formula I, which, for example, achieves enhanced conductivity, and/or enables the production of electrochemical cells having an improved life span in cycles.

A metallic fastener has a threaded portion coated with a composition. The composition includes (a) a paraffin wax with a melting temperature in the range of 50 to 70 C. (b) 1 to 5 parts by weight (pbw) of a resin per pbw of paraffin wax, (c) 0.1 to 0.25 pbw graphite per pbw of paraffin wax, and (d) 0.05 to 0.30 pbw of an FDA-approved silica per pbw of paraffin wax. A process for coating the metallic fastener includes: (i) providing the composition as defined above, (ii) maintaining the fastener or bringing it to a temperature in the range of 30 to 70 C., (iii) applying the composition at a temperature in the range of 100 to 170 C., (iv) optionally, removing surplus composition, (v) cooling the fastener to less than 100 C., (vi) finishing the fastener in a water bath, and (vii) drying the fastener.

In an amorphous carbon film of a sliding member, provided that a number of nitrogen atoms each singly bonded to three carbon atoms is A, and a number of nitrogen atoms each singly and doubly bonded to two carbon atoms, respectively, is B, a value A/B of the amorphous carbon film obtained through X-ray photoelectron spectroscopy analysis is 10 to 18. The method includes irradiating the surface of the substrate with nitrogen ion beams and irradiating a carbon target with electron beams, thereby forming an amorphous carbon film on the surface of the substrate while vapor-depositing a part of the carbon target onto the surface of the substrate. The output of the electron beams that irradiate the carbon target is 30 to 50 W.

A tubular member (1) with a relative rough (1.5-10 m) inner surface (5) coated solid lubricating film (10) which is transformed into a substantially viscous rubbery viscoelasto-plastic phase at temperatures in a range between 50 C. and 110 C. is expanded by moving an expansion member (24) with a relatively smooth outer surface (roughness<1.5 m) therethrough, such that during expansion a viscous viscoelastoplastic substantially rubbery lubricating film (44) is generated between the tubular member (1) and the expansion mandrel (24), which film remains bonded to the rough inner surface (5) of the expanded tubular (1), but does not stick to the relatively hot and smooth expansion member (24).

In a threaded joint for pipes constituted by a pin and a box, each having a contact surface comprising a threaded portion and an unthreaded metal contact portion, the contact surface of the pin has a solid corrosion protective, preferably transparent coating based on a UV-curable resin and the contact surface of the box has a solid lubricating coating having plastic or viscoplastic rheological behavior which is preferably formed by the hot melt technique from a composition comprising a thermoplastic polymer, a wax, a metal soap, a corrosion inhibitor, a water-insoluble liquid resin, and a solid lubricant.

A steel piston for an internal combustion engine includes an amorphous phosphate layer in at least one region thereof. On account of this layer the adhesion of an antifriction coating is improved.

The present invention provides a lubricant composition suitable for reducing friction between sliding members such as those within a pump for circulating a heat medium of a heat pump device, and a lubricating system using the composition as a heat medium. A lubricant composition 10 of the present invention comprises: an antifreeze liquid 11 containing ethylene glycol; and 0.01 mass % or less of nanodiamond particles 12. The nanodiamond particles 12 are preferably detonation nanodiamond particles. The lubricant composition 10 is preferably a liquid composition for a heat pump. In addition, the lubricating system of the present invention uses the lubricant composition 10 as a heat medium.

A method for producing a matrix-containing dry film on a threaded tubular component for drilling or working hydrocarbon wells, by applying a mixture containing a dispersion or an aqueous emulsion of an acrylic copolymer with a solution of an alkaline polysilicate in a liquid state onto a threaded end of the threaded tubular component by spraying at a temperature of from 20 C. to 40 C. thereby obtaining a threaded end coated with a film; drying the threaded end coated with the film; and densifying the film.