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:
A nano-sized CeO2 powder was synthesized by a modified glycine nitrate process(MGNP). The synthesized powder was characterized by X-ray diffraction (XRD), the BrunauerEmmett Teller (BET) method, and transmission electron microscopy (TEM). The lattice parameterand crystallite size were determined by the Rietveld refinement of X-ray diffraction patterns. Theshrinkage kinetics of the green body was continuously monitored in air and in oxygen atmospheresusing a high temperature dilatometer up to 1500°C. During the high temperature sintering in air aredox reaction occurred (Ce4+ was partially reduced to Ce3+, and oxygen gas was released). Theredox reaction influenced the sintering behaviour of CeO2, resulting in a decrease in density. On thebasis of shrinkage kinetics data in oxygen atmosphere a master sintering curve for CeO2 wasconstructed. Using the concept of the master sintering curve, the densification behaviour in oxygenatmosphere was successfully predicted from early to final stages of sintering. During sintering ofCeO2 at lower temperature in air atmosphere a significant contribution of the surface diffusion wasobserved
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.555.189.pdf
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