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Effect of the pressureless post-sintering on the hot isostatic pressed Al(2)O(3) prepared from the oxidized AlN powder

The effect of the pressureless post-sintering in hydrogen on the structural and mechanical properties of the hot isostatic pressed Al(2)O(3) prepared by oxidized AlN powder has been studied. The micrometer size AlN powder has been oxidized in air at 900° C and sintered by hot isostatic pressing (HIP...

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Autores principales: Balázsi, K., Varanasi, D., Horváth, Zs. E., Furkó, M., Cinar, F. S., Balázsi, C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9114336/
https://www.ncbi.nlm.nih.gov/pubmed/35581373
http://dx.doi.org/10.1038/s41598-022-12456-2
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author Balázsi, K.
Varanasi, D.
Horváth, Zs. E.
Furkó, M.
Cinar, F. S.
Balázsi, C.
author_facet Balázsi, K.
Varanasi, D.
Horváth, Zs. E.
Furkó, M.
Cinar, F. S.
Balázsi, C.
author_sort Balázsi, K.
collection PubMed
description The effect of the pressureless post-sintering in hydrogen on the structural and mechanical properties of the hot isostatic pressed Al(2)O(3) prepared by oxidized AlN powder has been studied. The micrometer size AlN powder has been oxidized in air at 900° C and sintered by hot isostatic pressing (HIP) at 1700 °C, 20 MPa nitrogen atmosphere for 5 h. Pressureless sintering (PS) has been applied for all HIP sintered samples in H(2) gas at 1800° C for 10 h. It has been shown that the oxidation caused a core–shell AlN/Al(2)O(3) structure and the amount of Al(2)O(3) increased with increasing of the oxidation time of the AlN powder. For the first time, the green samples obtained from oxidized AlN powder have been successfully sintered first by HIP followed by post-sintering by PS under hydrogen without adding any sintering additives. All post-sintered samples exhibited the main α-Al(2)O(3) phase. Sintering in H(2) caused the full transformation of AlN to α-Al(2)O(3) phase and their better densification. Therefore, the hardness values of post-sintered samples have been increased to 17–18 GPa having apparent densities between 3.11 and 3.39 g/cm(3).
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spelling pubmed-91143362022-05-19 Effect of the pressureless post-sintering on the hot isostatic pressed Al(2)O(3) prepared from the oxidized AlN powder Balázsi, K. Varanasi, D. Horváth, Zs. E. Furkó, M. Cinar, F. S. Balázsi, C. Sci Rep Article The effect of the pressureless post-sintering in hydrogen on the structural and mechanical properties of the hot isostatic pressed Al(2)O(3) prepared by oxidized AlN powder has been studied. The micrometer size AlN powder has been oxidized in air at 900° C and sintered by hot isostatic pressing (HIP) at 1700 °C, 20 MPa nitrogen atmosphere for 5 h. Pressureless sintering (PS) has been applied for all HIP sintered samples in H(2) gas at 1800° C for 10 h. It has been shown that the oxidation caused a core–shell AlN/Al(2)O(3) structure and the amount of Al(2)O(3) increased with increasing of the oxidation time of the AlN powder. For the first time, the green samples obtained from oxidized AlN powder have been successfully sintered first by HIP followed by post-sintering by PS under hydrogen without adding any sintering additives. All post-sintered samples exhibited the main α-Al(2)O(3) phase. Sintering in H(2) caused the full transformation of AlN to α-Al(2)O(3) phase and their better densification. Therefore, the hardness values of post-sintered samples have been increased to 17–18 GPa having apparent densities between 3.11 and 3.39 g/cm(3). Nature Publishing Group UK 2022-05-17 /pmc/articles/PMC9114336/ /pubmed/35581373 http://dx.doi.org/10.1038/s41598-022-12456-2 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Balázsi, K.
Varanasi, D.
Horváth, Zs. E.
Furkó, M.
Cinar, F. S.
Balázsi, C.
Effect of the pressureless post-sintering on the hot isostatic pressed Al(2)O(3) prepared from the oxidized AlN powder
title Effect of the pressureless post-sintering on the hot isostatic pressed Al(2)O(3) prepared from the oxidized AlN powder
title_full Effect of the pressureless post-sintering on the hot isostatic pressed Al(2)O(3) prepared from the oxidized AlN powder
title_fullStr Effect of the pressureless post-sintering on the hot isostatic pressed Al(2)O(3) prepared from the oxidized AlN powder
title_full_unstemmed Effect of the pressureless post-sintering on the hot isostatic pressed Al(2)O(3) prepared from the oxidized AlN powder
title_short Effect of the pressureless post-sintering on the hot isostatic pressed Al(2)O(3) prepared from the oxidized AlN powder
title_sort effect of the pressureless post-sintering on the hot isostatic pressed al(2)o(3) prepared from the oxidized aln powder
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9114336/
https://www.ncbi.nlm.nih.gov/pubmed/35581373
http://dx.doi.org/10.1038/s41598-022-12456-2
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