ISSN:
1013-9826
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 particle dispersed 3Y-TZP nanoceramics doped with TiO2 was fabricated by the vacuumreduction of Ti(OH)4, Al(NO3)3 and 3Y-TZ powders at 873K for 2h and sintered in air at 1573K~1823Kfor 2-6h. The relation between Al2O3 and TiO2 content, sintering parameters, relative density and grainsizes were studied. Microstructural investigations revealed that, in comparison with direct powder mixing,the reduction method is more efficient in achieving a homogeneous dispersed fine alumina second phase,which results in the reduction of matrix grain size and the increase of the relative density of the 3Y-TZPceramic. TiO2 addition facilitates the sintering process but may cause significant abnormal grain growthwhich can be offset by the homogeneity of the powder dispersion. A final 3Y-TZP-TiO2 ceramic matrixwith grain size below 500nm dispersed with ultrafine second phase Al2O3 was obtained
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2254.pdf
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