ISSN:
1013-9826
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:
To prevent the shrinkages by the densification during the application of unfired Al2O3-Crefractories or Al2O3 castables in steel making conditions, MgO was added as aggregate or matrix powderand the expansion caused by spinel formation was studied. Because the spinel was formed at thecontacting areas between Al2O3 and MgO particles and the volume of in-situ formed spinel increasedmore abnormally at the side of Al2O3 particles than MgO, the addition of MgO aggregates was notrecommendable due to the formation of large voids around the MgO aggregates. Nevertheless, corrosionresistance was increased with the amount of fine MgO added, and the finer MgO powder added, the betterresidual expansion and minute structure formation was observed. In the contrary, in case of castablesvolume expansion due to spinel formation was not obvious because the degree of densification was lessthan high-pressure formed refractories. But CA6 phase would not form around alumina aggregates duringcorrosion so the corrosion resistance was much more enhanced
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1495.pdf
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