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  • Metal oxide nanoparticle-based coating as a catalyzer for A-TIG welding [Elektronski vir] : critical raw material perspective
    Baloš, Sebastian ...
    Besides a wide application in corrosion protection, wear resistance increase, providing thermal properties and power conversion, oxide coatings have found an alternative application in welding ... technology as catalysts of the tungsten inert gas (TIG) welding process. In this paper, the novel approach of fabricating a coating containing nanoparticles based on nanosized SiO2 and TiO2 and their mixtures was applied to the austenitic stainless-steel base metal. It was found that coatings increased depths of penetration, enabling a consumable-free welding. Using this method, the use of several critical and near-critical raw materials (e.g., Si and Cr), as well as the relatively expensive Ni can be completely avoided. The most effective coating in terms of weld penetration consisted of a mixture of nanoparticles, rather than unary oxide coatings based on nanoparticles. A model for liquid weld metal flow is proposed based on the metallographic examination of recrystallized grains and microhardnesses measured near the weld metal, supporting the reversed Marangoni convection theory.
    Source: Metals [Elektronski vir]. - ISSN 2075-4701 (Vol. 9, iss. 5, 2019, f. 1-12)
    Type of material - e-article
    Publish date - 2019
    Language - english
    COBISS.SI-ID - 16623131

    Link(s):

    https://www.mdpi.com/2075-4701/9/5/567
    Repository of the University of Ljubljana – RUL
    DOI

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