Low temperature titanium hardening

Thomas Lundin Christiansen (Inventor), Morten Stendahl Jellesen (Inventor), Marcel A.J Somers (Inventor), Andreas Frederik Kielsholm Körkel (Inventor)

    Research output: Patent

    54 Downloads (Pure)

    Abstract

    The present invention relates to a method of oxygen hardening a Group IV metal, the method comprising the steps of: providing a workpiece of a Group IV metal in its final shape; oxidising the Group IV metal over an oxidising duration of at least 10 minutes in an oxidising atmosphere at a first temperature to provide a non-stratified Group IV metal oxide on the surface of the workpiece using a gaseous oxidising species having an upper temperature limit of up to 800°C wherein the first temperature is in the range of 500°C and the upper temperature limit of the gaseous oxidising species; diffusing oxygen from the non-stratified Group IV metal oxide into the Group IV metal in an inert atmosphere at a second temperature in the range of 500°C to 800°C and at a partial pressure of the gaseous oxidising species of up to 10-4 mbar over a diffusive duration of at least 0.1 hour to provide a superficial diffusion zone comprising oxygen in solid solution. In another aspect, the invention relates to a Group IV metal component comprising a material core having a core hardness and a surface hardness of at least the core hardness +200 HV0.025. The component is obtainable in the method of the invention.

    Original languageEnglish
    IPCC23C 8/ 80 A I
    Patent numberWO2021037757
    Filing date21/08/2020
    Country/TerritoryInternational Bureau of the World Intellectual Property Organization (WIPO)
    Priority date23/08/2019
    Priority numberEP20190193358
    Publication statusPublished - 4 Mar 2021

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