Dielectric properties of CaZrO3 coatings made by plasma spraying and bulks fired by spark plasma sintering

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F20%3A00531006" target="_blank" >RIV/61389021:_____/20:00531006 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21230/20:00346016

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0025540819316253?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0025540819316253?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.materresbull.2020.110775" target="_blank" >10.1016/j.materresbull.2020.110775</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Dielectric properties of CaZrO3 coatings made by plasma spraying and bulks fired by spark plasma sintering

Popis výsledku v původním jazyce

In this study, water stabilized plasma spraying (WSP) was used to prepare CaZrO3 coatings, whereas CaZrO3 bulk samples were fired using spark plasma sintering (SPS). The spraying feedstock was prepared from fine CaZrO3 powder by agglomeration (spray drying) and sintering. The initial fine CaZrO3 powder was used for SPS. In case of plasma sprayed materials, the influence of spraying process on the coating structure was studied. Differences in the structure of plasma sprayed thick coatings and SPS compacts were characterized using microscopy, density and porosity measurements. The deposits were striped-out from the substrate, ground and polished in order to produce samples in a shape of planparallel plates with a smooth surface. These samples – in principle monoblock capacitors – were subjected to low voltage alternating electric field with a frequency range from 1 kHz to 1 MHz and their capacitance and loss factor were measured. Relative permittivity was calculated afterwards from the measured capacitance. Dependences of permittivity and losses were also studied for varying temperatures in a range 20–150 °C. Volume resistivity was measured in direct electric field at a room temperature. Influence of the SPS process and subsequent annealing on the microstructure and dielectric properties was studied as well. Decrease of porosity and rearrangement of grains after proper annealing brought improvements in the dielectric characteristics.

Název v anglickém jazyce

Dielectric properties of CaZrO3 coatings made by plasma spraying and bulks fired by spark plasma sintering

Popis výsledku anglicky

In this study, water stabilized plasma spraying (WSP) was used to prepare CaZrO3 coatings, whereas CaZrO3 bulk samples were fired using spark plasma sintering (SPS). The spraying feedstock was prepared from fine CaZrO3 powder by agglomeration (spray drying) and sintering. The initial fine CaZrO3 powder was used for SPS. In case of plasma sprayed materials, the influence of spraying process on the coating structure was studied. Differences in the structure of plasma sprayed thick coatings and SPS compacts were characterized using microscopy, density and porosity measurements. The deposits were striped-out from the substrate, ground and polished in order to produce samples in a shape of planparallel plates with a smooth surface. These samples – in principle monoblock capacitors – were subjected to low voltage alternating electric field with a frequency range from 1 kHz to 1 MHz and their capacitance and loss factor were measured. Relative permittivity was calculated afterwards from the measured capacitance. Dependences of permittivity and losses were also studied for varying temperatures in a range 20–150 °C. Volume resistivity was measured in direct electric field at a room temperature. Influence of the SPS process and subsequent annealing on the microstructure and dielectric properties was studied as well. Decrease of porosity and rearrangement of grains after proper annealing brought improvements in the dielectric characteristics.

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

Materials Research Bulletin

ISSN

0025-5408

e-ISSN

—

Svazek periodika

124

Číslo periodika v rámci svazku

April

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

1-10

Kód UT WoS článku

000514005700033

EID výsledku v databázi Scopus

2-s2.0-85077733672