H.e.f.

Tecmachine

Mahle International Gmbh

Hydromecanique Et Frottement

Christophe Heau

Philippe Maurin-Perrier

Fabrice Prost

Sébastien Bucher

Constantin Iacob

Beat Schmidt

Laurent Bombillon

Sandrine Henry

Roland Lochmann

Jean-Paul Terrat

Olivier Blandenet

Marco Maurizi

Michel Martin

Paul Berger

Romain Montelimard

Benoit Terme

Yves Gachon

Frédéric Garcia

Sebastien Bucher

Benoît Terme

The present invention concerns a friction piece () suitable for operating in a lubricated medium at a temperature higher than 200&#xb0; C. The piece () comprises a metal surface () and an external coating () composed of tungsten carbide doped with nitrogen WC(N) with an atomic ratio of nitrogen between 5 and 12%. The invention also relates to a mechanical system () comprising such a piece (). The invention also relates to a method for implementing such a piece ().

Friction piece, mechanical system comprising such a friction piece and method of implementation

Some embodiments are directed to a multimaterial powder used in the field of metallurgy and plasturgy. The multimaterial powder includes support particles having a median particle size distribution between 1 &#x3bc;m and 100 &#x3bc;m and functionalising particles having a median particle size distribution that is a factor of 10 to 1000 lower relative to the support particles. The powder is characterised in that the support particles and the functionalising particles form composite grains having a core-shell structure that each have a core formed by a support particle, and a shell, that covers between 10 and 100% of the surface of the support particle and which is formed by at least one surface layer of the functionalising particles.

Multimaterial powder with composite grains for additive synthesis

Various implementations include a combustion engine piston, including a skirt in a counter-part and including a first contact area of the piston in the counter-part, a head which extends transverse to a central axis, and a ring carrier which comprises at least two lands and at least two grooves for receiving the rings, including a first land adjoining the head and a second land situated between the first land and the skirt, wherein the lands include at least one contact land having a diameter greater than a minimum diameter of the skirt to form a second contact area of the piston in the counter-part, and wherein at least one contact land comprises a friction-reducing surface coating, formed at least on a radial sector covering an angle of at least 30 degrees, and up to on a single sector covering an angle of 360 degrees.

Piston for a heat engine, heat engine comprising such a piston, and methods

A cam treatment to reduce the friction coefficient thereof relative to a counterpart in an area provided with a hard coating made from amorphous Diamond-Like Carbon or DLC, involves disposing the cams on a support, bringing the support and the cams into a chamber placed under vacuum so as to clean the cams, bringing the support into relative movement along a trajectory of travel relative to a coating source, and taking the cams off the support before assembling them on a camshaft; the method involves disposing the cams on the support in a fixed configuration which is defined in such a way that the cams are brought successively opposite the source with orientations and at distances substantially identical relative to the source, to deposit a hard coating made from amorphous Diamond-Like Carbon or DLC, selectively on the fraction of the section of the cams that is oriented towards the source.

Method for coating the nose of the cams of a camshaft with DLC, camshaft obtained in this way and facility for implementing said method

Some embodiments relate to a powder paint thermosetting binder composition that is solvent-free and includes at least one hardener and one cross-linking catalyst, and a first epoxy resin or a functionalized resin having at least one epoxy group. The resin has an epoxy equivalent weight of between 250 and 800 g/eq and a glass transition temperature of between 35 and 80&#xb0; C. A binder composition of this kind has a polymerization starting temperature of 80&#xb0; C. and a gel time of between 35 s and 140 s at 180&#xb0; C. Some embodiments also relate to a paint composition containing a thermosetting binder composition of this kind, at least one pigment and, optionally, in addition a leveling agent and inorganic or organic fillers.

Powder paint thermosetting binder composition and manufacturing method

A mechanical part provided with an amorphous carbon coating (with at least 70 wt. % of carbon not including hydrogen) and used to cooperate slidingly with an antagonistic part having a surface hardness which is a maximum of two thirds of that of the coating. The mechanical part is such that the coating has a roughness Ra which, measured by profilometry, is equal to a maximum of 0.050 microns and, measured by atomic force microscopy, a micro-roughness which is equal to a minimum of 0.004 microns and a maximum of 0.009 microns. This minimizes the wear of the less hard antagonistic part and that of the coating.

Mechanical part coated with a layer of amorphous carbon for sliding in relation to a less hard component

The piston pin has an anti-seize coating limited to an angular sector corresponding at least to a friction area submitted to a contact pressure along a preferential direction.

Piston pin and method of applying an anti-seize coating on the pin

An inside surface of an internal combustion engine liner is treated to have a surface roughness Ra smaller than 0.06 &#x3bc;m, and then receives a DLC coating. A method of producing the internal combustion engine liner includes: forming the liner from a metal material, polishing an inside surface of the liner to obtain a polished inside surface of roughness Ra smaller than 0.06 &#x3bc;m, and applying the DLC coating to the polished inside surface.

Internal combustion engine liner

The device includes at least two coaxial waveguides each formed of a central conductor and of an external conductor to bring microwaves into a treatment chamber. The at least two electromagnetic wave injection guides are combined with a magnetic circuit elongated in one direction. The magnetic circuit surrounding the waveguides by creating a magnetic field capable of achieving an ECR condition close to the waveguides.

Device for generating plasma having a high range along an axis by electron cyclotron resonance (ECR) from a gaseous medium

The lubricated environment incorporates a friction modifier, and a coating is applied to the part. The coating is chromium nitride and the friction modifier is MoDTC. The chromium nitride presents an NaCl-type crystallization and a microhardness of 1,800+/&#x2212;200 HV.

Friction piece operating in a lubricated medium

A part has a layer with a WC-C composition gradient, with the exception of a metal-containing undercoat and with the exception of an ion implantation layer and a DLC surface layer having cohesive behavior in scratch tests.

Part having a DLC coating and method for applying the DLC coating

A method of treating a surface of at least one part by individual sources of an electron cyclotron resonance plasma is characterized by subjecting the part(s) to at least one movement of revolution with regard to at least one fixed linear row of elementary sources. The linear row or rows of elementary sources are disposed parallel to the axis or axes of revolution of the part or parts.

Method of treating a surface of at least one part by means of individual sources of an electron cyclotron resonance plasma

A method for fabricating a heating a element includes modifying the surface state of a substrate in order to obtain at least one smooth area of low roughness and at least one rough area having a higher roughness; applying a highly electrically conductive material to these various areas; and connecting smooth area(s) of the conductive material to an electrical power source.

Method for fabricating a heating element by depositing thin layers on an insulating substrate and the element thus obtained

According to the method, drops of an adhesive material are deposited on one of the plates, with the drops being spaced from one another. A grid having a predefined thickness lower than that of the drops is applied to the plate receiving the drops. A perpendicular and uniform pressure is applied to at least one of the plates, so that the drops spread and come into contact with the opposing sides of the two plates. The spacing of the drops is defined so that after spreading under the pressure applied, air is not trapped between the drops.

Method for assembling at least two plates and use of the method for preparing an ion beam sputtering assembly

A coating includes a thin film which is intended to protect a corrodible part against corrosion and, to some extent, against wear and friction. The coating essentially includes a composition containing silicon, carbon, hydrogen and nitrogen such that: the atomic hydrogen concentration, measured using the ERDA technique, is 20 &#xb1;5 atoms %; the atomic silicon concentration, measured using the Rutherford backscattering (RBS) technique, is between 15 and 28 atoms %; the ratio of the atomic concentrations of nitrogen and carbon (N/C) is greater than 0.9; and the hardness of the material is less than or equal to 2100 daN/mm2.

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Saint-Etienne, France

Christophe Heau