Paper Title:
Densification of Alumina Ceramics by Infiltration of a Nano-Sized Alumina Sol into Alumina Green Samples
  Abstract

Infiltration of a nano-sized alumina sol into the green bodies is proposed to facilitate the ceramic sintering. The green samples were prepared by a colloidal processing based on drying induced forming, and then were immersed in a nano-sized alumina sol prior to their sintering at 1350-1600 oC. The alumina sol was characterized by using transmission electron microscopy and the grain structure of sintered alumina ceramics were examined by scanning electron microscopy. Significant densification of sintered samples was evidenced, in a depth of ~ 0.5 mm, on the samples treated with the alumina sol infiltration. It is indicated that filling of nano-sol into the micro-pores between particles of green samples enhanced the sintering densification process. The infiltration treatment by nano-sol may also provide an effective way to produce structurally gradient ceramics with a gradual changing density and/or composition from the surface into bulk.

  Info
Periodical
Materials Science Forum (Volumes 675-677)
Edited by
Yi Tan and Dongying Ju
Pages
183-186
DOI
10.4028/www.scientific.net/MSF.675-677.183
Citation
S. W. Jiang, G. L. Ning, "Densification of Alumina Ceramics by Infiltration of a Nano-Sized Alumina Sol into Alumina Green Samples", Materials Science Forum, Vols. 675-677, pp. 183-186, 2011
Online since
February 2011
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Price
$32.00
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