Premium
Effect of CaO Content on the Hot Strength of Alumina‐Spinel Castables in the Temperature Range of 1000° to 1500°C
Author(s) -
Chan ChenFeng,
Ko YungChao
Publication year - 1998
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1998.tb02719.x
Subject(s) - spinel , atmospheric temperature range , materials science , mineralogy , matrix (chemical analysis) , metallurgy , composite material , chemistry , thermodynamics , physics
The modulus of rupture of Al 2 O 3 ‐spinel castables containing 20 wt% Al 2 O 3 ‐rich MgO‐Al 2 O 3 spinel and 1.36‐2.04 wt% CaO generally increases with an increase in both CaO content and temperature from 1300° to 1500°C, but it remains virtually constant from 1000° to 1300°C. Microscopic observation of the castable fired at 1500°C for 3 h reveals the growth of some CA 6 crystals out of the Al 2 O 3 ‐rich spinel grains in the bonding matrix of the castable. The bond linkage between the CA 6 and spinel grains in the matrix is believed to cause both the CaO content and temperature dependence of the hot strength of the Al 2 O 3 ‐spinel castables as well as the hot strength enhancement of high‐Al 2 O 3 castables with addition of Al 2 O 3 ‐rich spinel.