Radiofrequency and Microwave Dielectric Properties of Plasma Sprayed and Annealed Thick Layers of Titanium Dioxide

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F20%3A00540265" target="_blank" >RIV/61389021:_____/20:00540265 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21230/20:00342449

Výsledek na webu

<a href="https://link.springer.com/article/10.1007%2Fs11666-020-01065-y" target="_blank" >https://link.springer.com/article/10.1007%2Fs11666-020-01065-y</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11666-020-01065-y" target="_blank" >10.1007/s11666-020-01065-y</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Radiofrequency and Microwave Dielectric Properties of Plasma Sprayed and Annealed Thick Layers of Titanium Dioxide

Popis výsledku v původním jazyce

Titanium dioxide (TiO2) was plasma sprayed using a high feed-rate spray system with hybrid water–argon stabilization torch (WSP-H). TiO2 powder agglomerated from nanometric particles was used as the feedstock. The produced coating had thickness over 4 mm, to be comparable with bulk ceramic bodies. The deposit was removed from the substrate and annealed in air to reoxidize the oxygen deficient as-sprayed titania and to obtain material with a proper dielectric behavior. Besides the microstructure studies, radiofrequency dielectric spectroscopy and microwave dielectric spectroscopy were in the focus of investigation. The approach to annealing of an extremely thick coating is studied: The significance of annealing of a large-area thick coating is discussed, as the role of grain interior and grain boundaries in the charge transport is influenced. Relative permittivity εr 94 and the Q*f product 12,800 GHz were reached at frequency 4 GHz, whereas the frequency response under 1 MHz was mapped continuously and the values (i.e., low and stable loss tangent) confirmed that a sprayed and air-annealed TiO2 is able to approach or also overperform dielectric parameters typical for TiO2 sintered bulk.

Název v anglickém jazyce

Radiofrequency and Microwave Dielectric Properties of Plasma Sprayed and Annealed Thick Layers of Titanium Dioxide

Popis výsledku anglicky

Titanium dioxide (TiO2) was plasma sprayed using a high feed-rate spray system with hybrid water–argon stabilization torch (WSP-H). TiO2 powder agglomerated from nanometric particles was used as the feedstock. The produced coating had thickness over 4 mm, to be comparable with bulk ceramic bodies. The deposit was removed from the substrate and annealed in air to reoxidize the oxygen deficient as-sprayed titania and to obtain material with a proper dielectric behavior. Besides the microstructure studies, radiofrequency dielectric spectroscopy and microwave dielectric spectroscopy were in the focus of investigation. The approach to annealing of an extremely thick coating is studied: The significance of annealing of a large-area thick coating is discussed, as the role of grain interior and grain boundaries in the charge transport is influenced. Relative permittivity εr 94 and the Q*f product 12,800 GHz were reached at frequency 4 GHz, whereas the frequency response under 1 MHz was mapped continuously and the values (i.e., low and stable loss tangent) confirmed that a sprayed and air-annealed TiO2 is able to approach or also overperform dielectric parameters typical for TiO2 sintered bulk.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Thermal Spray Technology

ISSN

1059-9630

e-ISSN

—

Svazek periodika

29

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

1718-1727

Kód UT WoS článku

000544834800001

EID výsledku v databázi Scopus

2-s2.0-85087370154