The Effect of Heat Treatment on the Microstructure and Phase Composition of Plasma Sprayed Al<sub>2</sub>O<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub> Coatings for Applications in Biomass Firing Plants
This study presents the thermal and chemical resistance of plasma-sprayed Al<sub>2</sub>O<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub> doped with 13 wt.% of TiO<sub>2</sub> coatings and their suitability for the fire grate of straw pellet fu...
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MDPI AG
2021
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oai:doaj.org-article:302ecb6faba0488c93e1b2e03035ef1b2021-11-25T17:15:38ZThe Effect of Heat Treatment on the Microstructure and Phase Composition of Plasma Sprayed Al<sub>2</sub>O<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub> Coatings for Applications in Biomass Firing Plants10.3390/coatings111112892079-6412https://doaj.org/article/302ecb6faba0488c93e1b2e03035ef1b2021-10-01T00:00:00Zhttps://www.mdpi.com/2079-6412/11/11/1289https://doaj.org/toc/2079-6412This study presents the thermal and chemical resistance of plasma-sprayed Al<sub>2</sub>O<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub> doped with 13 wt.% of TiO<sub>2</sub> coatings and their suitability for the fire grate of straw pellet furnaces. Coatings were deposited on steel substrates using direct current atmospheric pressure plasma spraying. The surface structure, elemental, and phase composition of formed coatings were analyzed before and after the thermal treatment, imitating natural application conditions. For the experiment, the annealing temperature was 500 °C for twenty-five cycles (80 min each). It was found that the steel substrate oxidized after five thermal cycles, and the formation of iron oxides was observed. The elemental composition of the Al<sub>2</sub>O<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub>-13 wt.% TiO<sub>2</sub> coatings remained unchanged even after 25 cycles of heat treatment. The X-ray diffraction (XRD) results revealed that the alpha-Al<sub>2</sub>O<sub>3</sub> to gamma-Al<sub>2</sub>O<sub>3</sub> phase ratio in the Al<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub> coating was reduced by only 8.7% after 25 cycles.Airingas ŠuopysLiutauras MarcinauskasViktorija GrigaitienėRomualdas KėželisMindaugas AikasRolandas UscilaSimona TučkutėMartynas LelisMDPI AGarticleplasma sprayingAl<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> coatingsthermal resistancechemical resistanceEngineering (General). Civil engineering (General)TA1-2040ENCoatings, Vol 11, Iss 1289, p 1289 (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
plasma spraying Al<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> coatings thermal resistance chemical resistance Engineering (General). Civil engineering (General) TA1-2040 |
| spellingShingle |
plasma spraying Al<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> coatings thermal resistance chemical resistance Engineering (General). Civil engineering (General) TA1-2040 Airingas Šuopys Liutauras Marcinauskas Viktorija Grigaitienė Romualdas Kėželis Mindaugas Aikas Rolandas Uscila Simona Tučkutė Martynas Lelis The Effect of Heat Treatment on the Microstructure and Phase Composition of Plasma Sprayed Al<sub>2</sub>O<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub> Coatings for Applications in Biomass Firing Plants |
| description |
This study presents the thermal and chemical resistance of plasma-sprayed Al<sub>2</sub>O<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub> doped with 13 wt.% of TiO<sub>2</sub> coatings and their suitability for the fire grate of straw pellet furnaces. Coatings were deposited on steel substrates using direct current atmospheric pressure plasma spraying. The surface structure, elemental, and phase composition of formed coatings were analyzed before and after the thermal treatment, imitating natural application conditions. For the experiment, the annealing temperature was 500 °C for twenty-five cycles (80 min each). It was found that the steel substrate oxidized after five thermal cycles, and the formation of iron oxides was observed. The elemental composition of the Al<sub>2</sub>O<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub>-13 wt.% TiO<sub>2</sub> coatings remained unchanged even after 25 cycles of heat treatment. The X-ray diffraction (XRD) results revealed that the alpha-Al<sub>2</sub>O<sub>3</sub> to gamma-Al<sub>2</sub>O<sub>3</sub> phase ratio in the Al<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub> coating was reduced by only 8.7% after 25 cycles. |
| format |
article |
| author |
Airingas Šuopys Liutauras Marcinauskas Viktorija Grigaitienė Romualdas Kėželis Mindaugas Aikas Rolandas Uscila Simona Tučkutė Martynas Lelis |
| author_facet |
Airingas Šuopys Liutauras Marcinauskas Viktorija Grigaitienė Romualdas Kėželis Mindaugas Aikas Rolandas Uscila Simona Tučkutė Martynas Lelis |
| author_sort |
Airingas Šuopys |
| title |
The Effect of Heat Treatment on the Microstructure and Phase Composition of Plasma Sprayed Al<sub>2</sub>O<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub> Coatings for Applications in Biomass Firing Plants |
| title_short |
The Effect of Heat Treatment on the Microstructure and Phase Composition of Plasma Sprayed Al<sub>2</sub>O<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub> Coatings for Applications in Biomass Firing Plants |
| title_full |
The Effect of Heat Treatment on the Microstructure and Phase Composition of Plasma Sprayed Al<sub>2</sub>O<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub> Coatings for Applications in Biomass Firing Plants |
| title_fullStr |
The Effect of Heat Treatment on the Microstructure and Phase Composition of Plasma Sprayed Al<sub>2</sub>O<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub> Coatings for Applications in Biomass Firing Plants |
| title_full_unstemmed |
The Effect of Heat Treatment on the Microstructure and Phase Composition of Plasma Sprayed Al<sub>2</sub>O<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub> Coatings for Applications in Biomass Firing Plants |
| title_sort |
effect of heat treatment on the microstructure and phase composition of plasma sprayed al<sub>2</sub>o<sub>3</sub> and al<sub>2</sub>o<sub>3</sub>-tio<sub>2</sub> coatings for applications in biomass firing plants |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/302ecb6faba0488c93e1b2e03035ef1b |
| work_keys_str_mv |
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