TITANIUM ALLOY MEMBER AND METHOD FOR MANUFACTURING THE SAME

    公开(公告)号:US20170356076A1

    公开(公告)日:2017-12-14

    申请号:US15529188

    申请日:2015-11-30

    IPC分类号: C23C8/24 C22C14/00

    摘要: There is provided a titanium alloy member including a base metal portion, and an outer hardened layer formed on an outer layer of the base metal portion, the cross sectional hardness of the base metal portion is 330 HV or higher and lower than 400 HV, the cross sectional hardnesses at positions 5 μm and 15 μm from the surface of the outer hardened layer are 450 HV or higher and lower than 600 HV, the outer hardened layer includes an oxygen diffusion layer and a nitrogen diffusion layer, the oxygen diffusion layer is at a depth of 40 to 80 μm from the surface of the outer hardened layer, and the nitrogen diffusion layer is at a depth of 2 to 5 μm from surface of the outer hardened layer. This titanium alloy member includes an outer hardened layer, is high in cross sectional hardness of the base metal portion, and is excellent in fatigue strength and wear resistance.

    DURABLE COSMETIC FINISHES FOR TITANIUM SURFACES

    公开(公告)号:US20170088931A1

    公开(公告)日:2017-03-30

    申请号:US14965716

    申请日:2015-12-10

    申请人: Apple Inc.

    摘要: A method for providing a surface finish to a metal part includes both diffusion hardening a metal surface to form a diffusion-hardened layer, and oxidizing the diffusion-hardened layer to create an oxide coating thereon. The diffusion-hardened layer can be harder than an internal region of the metal part and might be ceramic, and the oxide coating can have a color that is different from the metal or ceramic, the color being unachievable only by diffusion hardening or only by oxidizing. The metal can be titanium or titanium alloy, the diffusion hardening can include carburizing or nitriding, and the oxidizing can include electrochemical oxidization. The oxide layer thickness can be controlled via the amount of voltage applied during oxidation, with the oxide coating color being a function of thickness. An enhanced hardness profile can extend to a depth of at least 20 microns below the top of the oxide coating.