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    Piston for a heat engine, heat engine comprising such a piston, and methods
    2.
    发明授权
    Piston for a heat engine, heat engine comprising such a piston, and methods 有权

    公开(公告)号：US11098674B2

    公开(公告)日：2021-08-24

    申请号：US16477232

    申请日：2018-01-10

    Applicant: H.E.F.

    Inventor： Fabrice Prost ,  Christophe Heau ,  Romain Montelimard

    IPC: F02F3/00 ,  F16J1/02 ,  F16J9/00

    Abstract: 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.

    METHOD FOR SURFACE TREATMENT OF A STEEL COMPONENT BY NITRIDING OR NITROCARBURISING, OXIDISING AND THEN IMPREGNATING
    5.
    发明申请
    METHOD FOR SURFACE TREATMENT OF A STEEL COMPONENT BY NITRIDING OR NITROCARBURISING, OXIDISING AND THEN IMPREGNATING 审中-公开

    公开(公告)号：US20170349997A1

    公开(公告)日：2017-12-07

    申请号：US15538005

    申请日：2015-12-15

    Applicant: H.E.F.

    Inventor： Pierre-Louis MAGDINIER ,  Marie-Noelle DESBOUCHE-JANNY

    IPC: C23C8/80 ,  C23C8/58 ,  C23C8/02

    Abstract: Disclosed is a method for surface treatment of a steel component, providing high resistance to wear and corrosion, including nitriding or nitrocarburising to form a compound layer with a thickness of at least 8 micrometers made up of iron nitrides having phases ε and/or γ′, oxidizing to generate a layer of oxides with a thickness of 0.1-3 micrometers, and soaking in an impregnation bath during at least 5 minutes at room temperature, the bath being made up of at least 70 wt %, ±1%, of a solvent made up of a mixture of hydrocarbons formed by a C9 to C17 alkane fraction, 10 to 30 wt %, ±1%, of at least one paraffin oil formed by a C16 to C32 alkane fraction, and at least one additive such as a synthetic phenolic additive with a concentration of 0.01 to 3 wt %, ±0.1%.

    MECHANICAL PART COATED WITH A LAYER OF AMORPHOUS CARBON FOR SLIDING IN RELATION TO A LESS HARD COMPONENT
    7.
    发明申请
    MECHANICAL PART COATED WITH A LAYER OF AMORPHOUS CARBON FOR SLIDING IN RELATION TO A LESS HARD COMPONENT 审中-公开
    机械部件与不合组织碳化硅层相连，用于与较硬的部件相关的滑动

    公开(公告)号：US20160152915A1

    公开(公告)日：2016-06-02

    申请号：US14906558

    申请日：2014-07-07

    Applicant: H.E.F.

    Inventor： Christophe HEAU

    IPC: C10M103/02 ,  C10M103/06 ,  C10M103/04

    CPC classification number: C10M103/02 ,  C10M103/04 ,  C10M103/06 ,  C23C14/024 ,  C23C14/0605 ,  C23C14/325 ,  C23C16/0272 ,  C23C16/26

    Abstract: 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.

    Abstract translation: 具有无定形碳涂层（具有不包括氢的至少70重量％的碳）的机械部件，并用于与表面硬度最大为涂层的三分之二的表面硬度的拮抗部件滑动配合。 机械部件使得涂层具有通过轮廓测量法测量的最大值为0.050微米的粗糙度Ra，并且通过原子力显微镜测量的微粗糙度等于最小值为0.004微米，最大值为最大值 为0.009微米。 这最小化了较难硬的对抗部分和涂层的磨损。

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