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Metal Oxide Nanoparticle-Based Coating as a Catalyzer for A-TIG Welding: Critical Raw Material Perspective

1
Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovica 6, 21000 Novi Sad, Serbia
2
Faculty of Special Technology, Alexander Dubček University of Trenčín, Študentská 2 911 50 Trenčín, Slovakia
3
Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva c. 6, 1000 Ljubljana, Slovenia
4
Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, 10002 Zagreb, Croatia
5
Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Casaccia Research Centre, Via Anguillarese 301, 00123 Rome, Italy
*
Author to whom correspondence should be addressed.
Metals 2019, 9(5), 567; https://doi.org/10.3390/met9050567
Received: 6 March 2019 / Revised: 17 March 2019 / Accepted: 19 March 2019 / Published: 15 May 2019
(This article belongs to the Special Issue Metal Oxides)
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PDF [6840 KB, uploaded 15 May 2019]
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Abstract

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. View Full-Text
Keywords: oxide coating; nanoparticles; TIG welding; penetration depth oxide coating; nanoparticles; TIG welding; penetration depth
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Balos, S.; Dramicanin, M.; Janjatovic, P.; Zabunov, I.; Klobcar, D.; Busic, M.; Grilli, M.L. Metal Oxide Nanoparticle-Based Coating as a Catalyzer for A-TIG Welding: Critical Raw Material Perspective. Metals 2019, 9, 567.

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