Reactive hydrothermal liquid-phase densification (rHLPD) of ceramics - a study of the BaTiO3[TiO2] composite system
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Tarih
2016
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Wiley
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
A densification process called reactive hydrothermal liquid-phase densification (rHLPD), based on principles of hydrothermal reaction, infiltration, reactive crystallization, and liquid-phase sintering, is presented. rHLPD can be used to form monolithic ceramic components at low temperatures. The densification of barium titanate-titania composite monoliths was studied to demonstrate proof of concept for this densification model. Permeable, green titania (anatase) compacts were infiltrated with aqueous barium hydroxide solutions and reacted under hydrothermal conditions in the temperature range 90 degrees C-240 degrees C. The effects of reaction time and temperature on the conversion of titania (anatase) into barium titanate were studied. Utilizing a 72 h reaction at 240 degrees C between l.0 M Ba (OH)(2), an anatase (TiO2) powder compact, and a corresponding Ba/Ti ratio of 1.5, it was possible to crystallize a composite 95 wt% (88 mol%) BaTiO3 and 5 wt% (12 mol%) TiO2. The composite had a relative density of similar to 90% with a compressive strength of 172 +/- 21 MPa and a flexural strength of 49 +/- 4 MPa.
Açıklama
Riman, Richard Eric/0000-0002-4289-5768; Vakifahmetoglu, Cekdar/0000-0003-1222-4362
Anahtar Kelimeler
Hydrothermal Process, Densification, Barium Titanate, Mechanical Properties
Kaynak
Journal of the American Ceramic Society
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
99
Sayı
12
