Sol-gel processing and phase characterization of Al<inf>2</inf>O<inf>3</inf>and Al<inf>2</inf>O<inf>3</inf>/SiC nanocomposite powders

Monolithic Al2O3and Al2O3/SiC nanocomposite powders were prepared by sol-gel processing. The process involved the precipitation of Al(NO3)3·9H2O with NH4OH in excess water to form boehmite (AlOOH). XRD indicates that the subsequent thermal reaction proceeds by the phase transformation sequence AlOOH...

Full description

Saved in:
Bibliographic Details
Main Authors: Sukanda Jiansirisomboon, Kenneth J.D. MacKenzie
Format: Journal
Published: 2018
Subjects:
Online Access:https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=33644765828&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/61685
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Chiang Mai University
id th-cmuir.6653943832-61685
record_format dspace
spelling th-cmuir.6653943832-616852018-09-11T09:02:22Z Sol-gel processing and phase characterization of Al<inf>2</inf>O<inf>3</inf>and Al<inf>2</inf>O<inf>3</inf>/SiC nanocomposite powders Sukanda Jiansirisomboon Kenneth J.D. MacKenzie Engineering Materials Science Physics and Astronomy Monolithic Al2O3and Al2O3/SiC nanocomposite powders were prepared by sol-gel processing. The process involved the precipitation of Al(NO3)3·9H2O with NH4OH in excess water to form boehmite (AlOOH). XRD indicates that the subsequent thermal reaction proceeds by the phase transformation sequence AlOOH, γ-, δ-, θ-, to α-Al2O3. The27Al NMR spectra indicate a gradual increase in the proportion of Al in the tetrahedral sites of the γ-, δ- and θ-Al2O3formed at increasing calcination temperatures. Complete transformation to octahedral Al (α-Al2O3) is marked by the abrupt disappearance of tetrahedral Al. Al2O3/SiC nanocomposite powders were prepared by adding α-SiC powder to the boehmite precursor at the precipitation stage. Upon heating, the29Si NMR spectra of the Al2O3/SiC powders reveal α-SiC, Al2O3·xSiO2and SiO2phases. Stable α-Al2O3and α-Al2O3/SiC nanocomposite powders are formed at 1200 and 1300 °C, respectively. It appears likely that the presence of SiC modifies the thermal behaviour of the Al2O3in the nanocomposites by stabilising the Al2O3phases with concomitant oxidation of SiO2. © 2005 Elsevier Ltd. All rights reserved. 2018-09-11T08:57:03Z 2018-09-11T08:57:03Z 2006-04-13 Journal 00255408 2-s2.0-33644765828 10.1016/j.materresbull.2005.10.014 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=33644765828&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/61685
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
topic Engineering
Materials Science
Physics and Astronomy
spellingShingle Engineering
Materials Science
Physics and Astronomy
Sukanda Jiansirisomboon
Kenneth J.D. MacKenzie
Sol-gel processing and phase characterization of Al<inf>2</inf>O<inf>3</inf>and Al<inf>2</inf>O<inf>3</inf>/SiC nanocomposite powders
description Monolithic Al2O3and Al2O3/SiC nanocomposite powders were prepared by sol-gel processing. The process involved the precipitation of Al(NO3)3·9H2O with NH4OH in excess water to form boehmite (AlOOH). XRD indicates that the subsequent thermal reaction proceeds by the phase transformation sequence AlOOH, γ-, δ-, θ-, to α-Al2O3. The27Al NMR spectra indicate a gradual increase in the proportion of Al in the tetrahedral sites of the γ-, δ- and θ-Al2O3formed at increasing calcination temperatures. Complete transformation to octahedral Al (α-Al2O3) is marked by the abrupt disappearance of tetrahedral Al. Al2O3/SiC nanocomposite powders were prepared by adding α-SiC powder to the boehmite precursor at the precipitation stage. Upon heating, the29Si NMR spectra of the Al2O3/SiC powders reveal α-SiC, Al2O3·xSiO2and SiO2phases. Stable α-Al2O3and α-Al2O3/SiC nanocomposite powders are formed at 1200 and 1300 °C, respectively. It appears likely that the presence of SiC modifies the thermal behaviour of the Al2O3in the nanocomposites by stabilising the Al2O3phases with concomitant oxidation of SiO2. © 2005 Elsevier Ltd. All rights reserved.
format Journal
author Sukanda Jiansirisomboon
Kenneth J.D. MacKenzie
author_facet Sukanda Jiansirisomboon
Kenneth J.D. MacKenzie
author_sort Sukanda Jiansirisomboon
title Sol-gel processing and phase characterization of Al<inf>2</inf>O<inf>3</inf>and Al<inf>2</inf>O<inf>3</inf>/SiC nanocomposite powders
title_short Sol-gel processing and phase characterization of Al<inf>2</inf>O<inf>3</inf>and Al<inf>2</inf>O<inf>3</inf>/SiC nanocomposite powders
title_full Sol-gel processing and phase characterization of Al<inf>2</inf>O<inf>3</inf>and Al<inf>2</inf>O<inf>3</inf>/SiC nanocomposite powders
title_fullStr Sol-gel processing and phase characterization of Al<inf>2</inf>O<inf>3</inf>and Al<inf>2</inf>O<inf>3</inf>/SiC nanocomposite powders
title_full_unstemmed Sol-gel processing and phase characterization of Al<inf>2</inf>O<inf>3</inf>and Al<inf>2</inf>O<inf>3</inf>/SiC nanocomposite powders
title_sort sol-gel processing and phase characterization of al<inf>2</inf>o<inf>3</inf>and al<inf>2</inf>o<inf>3</inf>/sic nanocomposite powders
publishDate 2018
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=33644765828&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/61685
_version_ 1681425666710437888