- Tytuł:
- The formation of pyrochlores during plasma spraying of REO and zirconia oxides powder mixture
- Autorzy:
-
Kubaszek, Tadeusz
Nowak, Wojciech J.
Pędrak, Paweł
Góral, Marek
Rybus, Kinga
Ślemp, Karol - Powiązania:
- https://bibliotekanauki.pl/articles/95173.pdf
- Data publikacji:
- 2019
- Wydawca:
- Politechnika Koszalińska. Wydawnictwo Uczelniane
- Tematy:
-
thermal barrier coatings
plasma spraying
ceramic coating
rare earth oxides
pyrochlores
porosity
powłokowe bariery cieplne
natryskiwanie plazmowe
powłoki ceramiczne
tlenki metali ziem rzadkich
pirochlory
porowatość - Opis:
- The pyrochlores are the promising low-thermal conductive materials for Thermal Barrier Coatings applications. In present work the concept of pyrochlore formation during APS spraying of ZrO2 and ReO was analyzed. The specially prepared agglomerated mixtures of ZrO2 with Nd2O3, Yb2O3, Er2O3 and Gd2O3 oxides were plasma sprayed using A60 plasma torch on NiCoCrAlY-type bond coat. The influence of plasma gasses composition on coatings’ microstructure was investigated. The results of XRD phase analysis proved formation of pyrochlores from Gd2O3 +ZrO2 and Nd2O3+ZrO2 mixtures. The formation of Er4O12Zr3 from Er2O3+ ZrO2 mixture as well as Zr3Yb4 from Yb2O3+ ZrO2 powder was detected. The presence of pure rare earth oxides (REO) and zirconia oxides was observed in all types of sprayed coatings. The microstructural assessment showed differences in porosity and thickness of obtained ceramic coatings depending of type of REO oxides. The analysis of results showed that it is possible to obtain pyrochlore ceramic coatings from pure oxides mixture. The plasma energy was not efficient for full formation of pyrochlores, therefore the presence of pure oxides was observed.
- Źródło:
-
Journal of Mechanical and Energy Engineering; 2019, 3, 2; 141-147
2544-0780
2544-1671 - Pojawia się w:
- Journal of Mechanical and Energy Engineering
- Dostawca treści:
- Biblioteka Nauki
Artykuł