Paper Title:
Effects of Rare Earth Oxides on Microstructures and Properties of Magnesia Refractories
  Abstract

The effects of Y2O3, La2O3 and Nd2O3 on the sintering, microstructure and mechanical properties of magnesia refractories were investigated. Addition of rare earth oxide (ReO) to magnesia refractories increases the bulk density, decreases the porosity and improves the mechanical strength of the refractories. The improved sinterability was attributable to the vacancies generation associated with the solid-solution reactions between MgO and ReO. In the samples with ReO, rare earth silicate phases form at magnesia grain boundaries, providing additional bonding between magnesia grains and between magnesia grains and matrix. Consequently, the samples with ReO showed much higher high temperature strengths than those without ReO.

  Info
Periodical
Key Engineering Materials (Volumes 368-372)
Edited by
Wei Pan and Jianghong Gong
Pages
1158-1160
DOI
10.4028/www.scientific.net/KEM.368-372.1158
Citation
B. G. Zhang, Z. F. Wang, S. W. Zhang, X. T. Wang, Z. W. Xu, "Effects of Rare Earth Oxides on Microstructures and Properties of Magnesia Refractories", Key Engineering Materials, Vols. 368-372, pp. 1158-1160, 2008
Online since
February 2008
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Price
$32.00
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