SHRINKAGE REDUCTION IN SILICA-BASED REFRACTORY CORES INFILTRATED WITHBOEHMITE

Authors
LEQUEUX N RICHARD N BOCH P
Citation
N. Lequeux et al., SHRINKAGE REDUCTION IN SILICA-BASED REFRACTORY CORES INFILTRATED WITHBOEHMITE, Journal of the American Ceramic Society, 78(11), 1995, pp. 2961-2966
Citations number
26
Categorie Soggetti
Material Science, Ceramics
Journal title
Journal of the American Ceramic Society → ACNP
ISSN journal
00027820
Volume
78
Issue
11
Year of publication
1995
Pages
2961 - 2966
Database
ISI
SICI code
0002-7820(1995)78:11<2961:SRISRC>2.0.ZU;2-#
Abstract
Infiltration of silica-based refractory cores with colloidal boehmite slurry has the effect of greatly reducing sintering shrinkage, as requ ired for precision casting. Only 300 ppm of equivalent alumina is suff icient to decrease the shrinkage from RT to 1600 degrees C more than t hree-fold. Microstructural observations and XPS measures show that the silica grains are homogeneously coated with a reaction film which hin ders viscous flow.