Dielectric properties of Ce-doped YAG coatings produced by two techniques of plasma spraying

0573504 - ÚFP 2024 RIV NL eng J - Journal Article
Ctibor, Pavel - Sedláček, J. - Hudec, T.
Dielectric properties of Ce-doped YAG coatings produced by two techniques of plasma spraying.
Boletin de la Sociedad Espanola de Ceramica y Vidrio. Roč. 61, č. 5 (2022), s. 408-416. ISSN 0366-3175. E-ISSN 2173-0431
Institutional support: RVO:61389021
Keywords : Cerium-doped YAG * Dielectric properties * Insulators * Phase analysis * Plasma spray
OECD category: Ceramics
Impact factor: 3.4, year: 2022
Method of publishing: Open access
https://www.sciencedirect.com/science/article/pii/S0366317521000145?via%3Dihub

Yttrium aluminum garnet (YAG) with cerium admixture (Ce:YAG) was plasma sprayed using two different devices gas-stabilized plasma (GSP) torch and water-stabilized plasma (WSP) torch. Coatings on stainless steel as well as self-standing plates were produced. Besides microstructure and crystallographic characterizations, dielectric tests were performed on these coatings. They included capacitance (i.e. relative permittivity), loss tangent and volume resistivity measurements. After spraying, the YAG crystal phase was preserved without any decomposition, but an amorphous fraction was detected in the as-sprayed coatings deposited by both processes. The dielectric behavior of the coatings was influenced by imperfections like splat boundaries, pores and thin cracks. The Ce:YAG samples were successfully plasma sprayed by both spray techniques. Selected aspects of wear were measured and compared with a single-crystal. The dielectric properties are comparable with the single-crystal and highly promising, particularly the loss tangent with values so low that they were not found in any other as-sprayed ceramic coating.
Permanent Link: https://hdl.handle.net/11104/0343938