Large enhancement of thermal conductance at ambient and cryogenic temperatures by laser remelting of plasma-sprayed Al2O3 coatings on Cu

Cubero, Á. (Universidad de Zaragoza) ; Martínez, E. ; de la Fuente, G.F. ; García Cano, I. ; Dosta, S. ; Angurel Lambán, L.A. (Universidad de Zaragoza)

Resumen: 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 ¿-Al2O3 phase of the as-sprayed coatings to stable a-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. © 2021

Idioma: Inglés

DOI: 10.1016/j.materresbull.2021.111450

Año: 2021

Publicado en: Materials Research Bulletin 143 (2021), 111450 [11 pp.]
ISSN: 0025-5408

Factor impacto JCR: 5.6 (2021)

Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 110 / 345 = 0.319 (2021) - Q2 - T1

Factor impacto CITESCORE: 9.8 - Engineering (Q1) - Physics and Astronomy (Q1) - Materials Science (Q1)

Factor impacto SCIMAGO: 0.818 - Condensed Matter Physics (Q1) - Mechanical Engineering (Q1) - Materials Science (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/T54-20R
Financiación: info:eu-repo/grantAgreement/ES/MINECO/ENE2017-83669-C4-1-R

Tipo y forma: Article (Published version)

Área (Departamento): Área Cienc.Mater. Ingen.Metal. (Dpto. Ciencia Tecnol.Mater.Fl.)