ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Al2O3 compacts with various phases were prepared by hydrolysis and spark plasmasintering (SPS) process of Al powder. The bayerite ([removed info]-Al(OH)3) phase was derived by hydrolysis ofcommercial Al powder with micron size, whereas the bohemite (AlO(OH)) phase was obtained byhydrolysis of nano Al powder synthesized by pulsed wire evaporation (PWE) method. Compaction aswell as dehydration of both bayerite and bohemite was carried out simultaneously by SPS method,which is used to fabricate nano powder into dense compacts with a rapid heating rate of about 100 ºCper min. under the pressure of 50 MPa. After compaction in the temperature ranges from 350 ºC to1100 ºC, the bayerite and bohemite phases change into various alumina phases depending on thecompaction temperatures. The bayerite shows the phase transition of Al(OH)3 [removed info] [removed info]-Al2O3 [removed info] [removed info]-Al2O3[removed info] [removed info]-Al2O3 sequences. On the other hand, the bohemite experiences the phase transition fromAlO(OH) to [removed info] -Al2O3 at 350 ºC showing AlO(OH) [removed info] [removed info] -Al2O3 [removed info] [removed info]-Al2O3 [removed info] [removed info]-Al2O3 [removed info] [removed info]-Al2O3sequences
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.1129.pdf
