Structural evolutions in Ti and TiO2 powders by ball milling and subsequent heat-treatments

In this study, nanocrystalline Ti and TiO2 powders were synthesized by wet milling of Ti powder within water and reactive milling of Ti powder under oxygen atmosphere, respectively. The wet milling processes were performed at 300 rpm milling speed for different milling durations (6, 12, 24, and 48 h). Subsequent heat-treatments of the as-milled powders were performed at 200-800 °C for 1 h in an air atmosphere. Structural characteristics of the as-milled and the heat-treated powders were investigated by X-ray diffraction (XRD). The crystallite size, lattice strain and lattice parameters of the powders were also calculated. It has been realized that during the wet milling process, elemental Ti powder undergoes an hcp to fcc polymorphic transformation, which is related to grain refinement and plastic strain. In addition, TiO 2 powders are produced after heat-treatments at 600 and 800 °C. Reactive milling of the elemental Ti powder in pressurized oxygen atmosphere leads to nanocrystalline TiO2 powders with an average crystallite size of about 10 nm after 48 h milling time. The subsequent heat-treatments of the as-milled TiO2 powders results in the increase of the crystallite size up to 70-150 nm. In order to understand the thermal behavior of the as-milled powders, thermal analysis (DTA) and thermogravimetric analysis (TGA) were employed. The activation energy of the nanocrystalline TiO2 powders was determined by the Kissinger method is 128±3 kJ/mol. © 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Dergi Adı Ceramics International
Dergi Cilt Bilgisi 40
Dergi Sayısı 7 PART B
Sayfalar 11123 - 11130
Yayın Yılı 2014
Eser Adı
[dc.title]
Structural evolutions in Ti and TiO2 powders by ball milling and subsequent heat-treatments
Yazar
[dc.contributor.author]
Avar B.
Yazar
[dc.contributor.author]
Ozcan S.
Yayın Yılı
[dc.date.issued]
2014
Yayıncı
[dc.publisher]
Elsevier Ltd
Yayın Türü
[dc.type]
article
Özet
[dc.description.abstract]
In this study, nanocrystalline Ti and TiO2 powders were synthesized by wet milling of Ti powder within water and reactive milling of Ti powder under oxygen atmosphere, respectively. The wet milling processes were performed at 300 rpm milling speed for different milling durations (6, 12, 24, and 48 h). Subsequent heat-treatments of the as-milled powders were performed at 200-800 °C for 1 h in an air atmosphere. Structural characteristics of the as-milled and the heat-treated powders were investigated by X-ray diffraction (XRD). The crystallite size, lattice strain and lattice parameters of the powders were also calculated. It has been realized that during the wet milling process, elemental Ti powder undergoes an hcp to fcc polymorphic transformation, which is related to grain refinement and plastic strain. In addition, TiO 2 powders are produced after heat-treatments at 600 and 800 °C. Reactive milling of the elemental Ti powder in pressurized oxygen atmosphere leads to nanocrystalline TiO2 powders with an average crystallite size of about 10 nm after 48 h milling time. The subsequent heat-treatments of the as-milled TiO2 powders results in the increase of the crystallite size up to 70-150 nm. In order to understand the thermal behavior of the as-milled powders, thermal analysis (DTA) and thermogravimetric analysis (TGA) were employed. The activation energy of the nanocrystalline TiO2 powders was determined by the Kissinger method is 128±3 kJ/mol. © 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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]
Ball milling
Konu Başlıkları
[dc.subject]
Heat-treatment
Konu Başlıkları
[dc.subject]
Thermal behavior
Konu Başlıkları
[dc.subject]
Titanium
Konu Başlıkları
[dc.subject]
Titanium dioxide
Haklar
[dc.rights]
info:eu-repo/semantics/closedAccess
ISSN
[dc.identifier.issn]
0272-8842
Sponsor YAYINCI
[dc.description.sponsorship]
0901-602006
Sponsor YAYINCI
[dc.description.sponsorship]
We would like to thank Hacettepe University , Scientific Research and Development Office, through the Grant (no. 0901-602006 ) and TUBITAK-BIDEP postdoctoral research fellowship.
İlk Sayfa Sayısı
[dc.identifier.startpage]
11123
Son Sayfa Sayısı
[dc.identifier.endpage]
11130
Dergi Adı
[dc.relation.journal]
Ceramics International
Dergi Sayısı
[dc.identifier.issue]
7 PART B
Dergi Cilt Bilgisi
[dc.identifier.volume]
40
Tek Biçim Adres
[dc.identifier.uri]
https://dx.doi.org/10.1016/j.ceramint.2014.03.137
Tek Biçim Adres
[dc.identifier.uri]
https://hdl.handle.net/20.500.12628/7656
Görüntülenme Sayısı ( Şehir )
Görüntülenme Sayısı ( Ülke )
Görüntülenme Sayısı ( Zaman Dağılımı )
Görüntülenme
24
09.12.2022 tarihinden bu yana
İndirme
1
09.12.2022 tarihinden bu yana
Son Erişim Tarihi
07 Şubat 2024 06:57
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powders milling as-milled powder atmosphere heat-treatments crystallite nanocrystalline oxygen elemental strain lattice thermal analysis performed Kissinger average increase results subsequent 70-150 reserved pressurized Reactive Techna produced energy method activation 128±3 kJ/mol employed determined thermogravimetric behavior
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