2026-04-17T02:40:15Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2190172025-12-04T20:57:10Zcom_2072_1057col_2072_478796col_2072_478917

00925njm 22002777a 4500 dc Cubero, Alvaro author Martinez, Elena author de la Fuente, German F. author García Cano, Irene author Dosta Parras, Sergi author Angurel, Luis A. author 2025-02-19T18:44:21Z 2025-02-19T18:44:21Z 2021-06-29 2025-02-19T18:44:21Z Joints of high thermal contact conductance and electrical insulation have been obtained by coating copper supports with thin alumina (Al2O3) layers (of 140–150 μm thickness). This has been achieved by a combination of plasma spraying process and the subsequent coating remelting by a near-Infrared (n-IR) laser. With a proper optimization of the laser processing conditions, it is possible to transform the metastable γ-Al2O3 phase of the assprayed coatings to stable α-Al2O3, and to achieve denser alumina coatings. This results in a large enhancement of the thermal conductance of the joints, enabling their application as heat sinks at cryogenic and ambient temperatures. The process proposed in this work is scalable for the formation of alumina coatings on large metallic pieces of complex geometries.  Superconductivitat a altes temperatures Revestiments High temperature superconductivity Coatings Large enhancement of thermal conductance at ambient and cryogenic temperatures by laser remelting of plasma-sprayed Al2O3 coatings on Cu