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    SYNERGY FOR IMPROVED THERMAL SPRAY ADHESION
    2.
    发明申请
    SYNERGY FOR IMPROVED THERMAL SPRAY ADHESION 审中-公开

    公开(公告)号：US20190040514A1

    公开(公告)日：2019-02-07

    申请号：US15668027

    申请日：2017-08-03

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Su Jung Han ,  Martin S. Kramer ,  Peng Lu ,  Zhe Li ,  Yucong Wang

    IPC: C23C4/02 ,  C23C4/12 ,  C23C4/06 ,  F02F1/00

    Abstract: A method of coating an inner surface of an engine cylinder bore includes cleaning the surface to remove carbon, resulting in the surface having a maximum of 30 atomic percent carbon, texturing the surface to achieve a developed interfacial area ratio of at least 100%, and heating the surface to between 100-200 degrees Celsius. A thermal spray coating is then adhered to the surface. In some cases, a force of 25+ Newtons scratched across the thermal spray coating is required to remove the thermal spray coating from the surface. Maximum adhesion strength is achieved when the coating is applied to: 1) a heated surface that has 2) an Sdr of at least 100% and 3) a maximum of 20 atomic percent of carbon on the surface. When these three criteria are all present, adhesion strength can be 50 Newtons or more with evidence of metallurgical diffusion/bonding at the interface.

    STRESS RELIEF OF MECHANICALLY ROUGHENED CYLINDER BORES FOR REDUCED CRACKING TENDENCY
    3.
    发明申请
    STRESS RELIEF OF MECHANICALLY ROUGHENED CYLINDER BORES FOR REDUCED CRACKING TENDENCY 有权
    用于减少破裂倾向的机械加固缸体的应力消除

    公开(公告)号：US20160258047A1

    公开(公告)日：2016-09-08

    申请号：US15042208

    申请日：2016-02-12

    Applicant: GM Global Technology Operations LLC

    Inventor： Yucong Wang ,  Martin S. Kramer

    IPC: C23C4/02 ,  C23F17/00 ,  C22F1/00 ,  C22F3/00 ,  F02F1/00 ,  C22F1/04

    CPC classification number: C23C4/02 ,  C22F1/002 ,  C22F1/04 ,  C22F3/00 ,  F02F1/00 ,  F02F2001/008 ,  F02F2200/06

    Abstract: A method of treating the surface of an aluminum-based engine block cylinder bore that has been mechanically roughened. In one form, this method includes using vibratory stress relief, elevated temperature stress relief or cryogenic stress relief so that residual stresses imparted to the surface by the roughening process are reduced. In this way, a protective coating that is also applied to the bore surface will exhibit better adhesion and lower incidence of stress-induced or fatigue-induced cracking.

    Abstract translation: 一种处理机械粗糙化的铝基发动机缸体缸面的表面的方法。 在一种形式中，该方法包括使用振动应力消除，升高的温度应力消除或低温应力消除，从而减小通过粗糙化过程赋予表面的残余应力。 以这种方式，也施加到孔表面的保护涂层将表现出更好的附着力和更低的应力诱发或疲劳引起的裂纹的发生。

    Manufacturing Nd—Fe—B magnets using hot pressing with reduced dysprosium or terbium
    9.
    发明授权
    Manufacturing Nd—Fe—B magnets using hot pressing with reduced dysprosium or terbium 有权

    公开(公告)号：US10186374B2

    公开(公告)日：2019-01-22

    申请号：US14193113

    申请日：2014-02-28

    Applicant: GM Global Technology Operations LLC

    Inventor： Yucong Wang

    IPC: H01F41/02 ,  H01F7/02

    Abstract: A method of making a magnetic material for a permanent magnet using hot-pressing or die-upset methods, or both, by combining two powders and optimizing grain boundary diffusion of Dy or Tb. The method can include making magnetic material for a permanent magnet using hot pressing using a core powder containing Nd, Fe and B and a surface powder containing Dy or Tb in metallic alloy form, combining the materials, forming a solid material in a shaped mold under a magnetic field in vacuum, heating the solid material, hot pressing it to form a magnetic material in a die, heat treating it if necessary, and then cooling it.

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