Carbon nanotube/boehmite-derived alumina ceramics obtained by hydrothermal synthesis and spark plasma sintering (SPS)

Preparation, structure and properties of hydrothermally treated carbon nanotube/boehmite (CNT/?-AlOOH) and densification with spark plasma sintering of Al2O3 and CNT/Al2O3 nanocomposites were investigated. Hydrothermal synthesis was employed to produce CNT/boehmite from an aluminum acetate (Al(OH)(C2H3O2)2) and multiwall-CNTs mixture (200°C/2h.). TEM observations revealed that the size of the cubic shape boehmite particles lies around 40nm and the presence of the interaction between surface functionalized CNTs and boehmite particles acts to form 'nanocomposite particles'. Al2O3 and CNT/Al2O3 compact bodies were formed by means of spark plasma sintering (SPS) at 1600°C for 5min using an applied pressure of 50MPa resulting in the formation of stable ?-Al2O3 phase and CNT-alumina compacts with nearly full density. It was also found that CNTs tend to locate along the alumina grain boundaries and therefore inhibit the grain coarsening and cause inter-granular fracture mode. The DC conductivity measurements reveal that the DC conductivity of CNT/Al2O3 is 10-4S/m which indicate that there is a 4 orders of magnitude increase in conductivity compared to monolithic Al2O3. The results of the microhardness tests indicate a slight increase in hardness for CNT/Al2O3 (28.35GPa for Al2O3 and 28.57GPa for CNT/Al2O3). © 2010 Elsevier Ltd.

Yazar Zaman A.C.
Üstündag C.B.
Çelik A.
Kara A.
Kaya F.
Kaya C.
Yayın Türü Article
Tek Biçim Adres https://hdl.handle.net/20.500.12628/4578
Tek Biçim Adres 10.1016/j.jeurceramsoc.2010.07.037
Konu Başlıkları Al2O3
Carbon nanotube
Hydrothermal synthesis
Spark plasma sintering
Koleksiyonlar Araştırma Çıktıları | WoS | Scopus | TR-Dizin | PubMed | SOBİAD
Scopus İndeksli Yayınlar Koleksiyonu
WoS İndeksli Yayınlar Koleksiyonu
Dergi Adı Journal of the European Ceramic Society
Dergi Cilt Bilgisi 30
Dergi Sayısı 16
Sayfalar 3351 - 3356
Yayın Yılı 2010
Eser Adı
[dc.title]
Carbon nanotube/boehmite-derived alumina ceramics obtained by hydrothermal synthesis and spark plasma sintering (SPS)
Yazar
[dc.contributor.author]
Zaman A.C.
Yazar
[dc.contributor.author]
Üstündag C.B.
Yazar
[dc.contributor.author]
Çelik A.
Yazar
[dc.contributor.author]
Kara A.
Yazar
[dc.contributor.author]
Kaya F.
Yazar
[dc.contributor.author]
Kaya C.
Yayın Yılı
[dc.date.issued]
2010
Yayın Türü
[dc.type]
article
Özet
[dc.description.abstract]
Preparation, structure and properties of hydrothermally treated carbon nanotube/boehmite (CNT/?-AlOOH) and densification with spark plasma sintering of Al2O3 and CNT/Al2O3 nanocomposites were investigated. Hydrothermal synthesis was employed to produce CNT/boehmite from an aluminum acetate (Al(OH)(C2H3O2)2) and multiwall-CNTs mixture (200°C/2h.). TEM observations revealed that the size of the cubic shape boehmite particles lies around 40nm and the presence of the interaction between surface functionalized CNTs and boehmite particles acts to form 'nanocomposite particles'. Al2O3 and CNT/Al2O3 compact bodies were formed by means of spark plasma sintering (SPS) at 1600°C for 5min using an applied pressure of 50MPa resulting in the formation of stable ?-Al2O3 phase and CNT-alumina compacts with nearly full density. It was also found that CNTs tend to locate along the alumina grain boundaries and therefore inhibit the grain coarsening and cause inter-granular fracture mode. The DC conductivity measurements reveal that the DC conductivity of CNT/Al2O3 is 10-4S/m which indicate that there is a 4 orders of magnitude increase in conductivity compared to monolithic Al2O3. The results of the microhardness tests indicate a slight increase in hardness for CNT/Al2O3 (28.35GPa for Al2O3 and 28.57GPa for CNT/Al2O3). © 2010 Elsevier Ltd.
Kayıt Giriş Tarihi
[dc.date.accessioned]
2019-12-23
Açık Erişim Tarihi
[dc.date.available]
2019-12-23
Yayın Dili
[dc.language.iso]
eng
Konu Başlıkları
[dc.subject]
Al2O3
Konu Başlıkları
[dc.subject]
Carbon nanotube
Konu Başlıkları
[dc.subject]
Hydrothermal synthesis
Konu Başlıkları
[dc.subject]
Spark plasma sintering
Haklar
[dc.rights]
info:eu-repo/semantics/closedAccess
ISSN
[dc.identifier.issn]
0955-2219
Sponsor YAYINCI
[dc.description.sponsorship]
108T651
Sponsor YAYINCI
[dc.description.sponsorship]
This work was funded by TUBITAK (The Scientific and Technological Research Council of Turkey) under the contract number 108T651. Prof. Gültekin Göller from Istanbul Technical University and Özgür Duygulu from TUBITAK MAM are also acknowledged for the assistance with FEG-SEM and TEM studies, respectively.
İlk Sayfa Sayısı
[dc.identifier.startpage]
3351
Son Sayfa Sayısı
[dc.identifier.endpage]
3356
Dergi Adı
[dc.relation.journal]
Journal of the European Ceramic Society
Dergi Sayısı
[dc.identifier.issue]
16
Dergi Cilt Bilgisi
[dc.identifier.volume]
30
Tek Biçim Adres
[dc.identifier.uri]
https://dx.doi.org/10.1016/j.jeurceramsoc.2010.07.037
Tek Biçim Adres
[dc.identifier.uri]
https://hdl.handle.net/20.500.12628/4578
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Görüntülenme Sayısı ( Zaman Dağılımı )
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36
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09.12.2022 tarihinden bu yana
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18 Mayıs 2024 14:13
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CNT/Al2O3 particles conductivity indicate increase boehmite sintering plasma density CNT-alumina compacts fracture inter-granular nearly inhibit coarsening therefore boundaries alumina locate Preparation slight Elsevier CNT/Al2O3) hardness measurements microhardness results monolithic compared magnitude orders ?-Al2O3 10-4S/m reveal
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