Dissemination of IT for the Promotion of Materials Science (DoITPoMS)

DoITPoMS Micrograph Library Full Record for Micrograph 192
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Full Record for Micrograph 192

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Micrograph no
192
Brief description
Doloma, (Ca,Mg)O
Keywords
calcia, ceramic Link to MATTER Glossary entry for ceramic, doloma, lime Link to MATTER Glossary entry for lime, magnesia, periclase
Categories
Ceramic
System
(Ca,Mg)O
Composition
CaO 57, MgO 41 (wt%), + Fe2O3, SiO2 and Al2O3 (typical)
Standard codes
Reaction
Processing
Formed by calcining dolomite ore > 900ºC. CO2 is given off as the single-phase carbonate decomposes to form the two phase oxide ceramic.
Applications
Used as an additive to control slag basicity in steelmaking and in basic refractories.
Sample preparation
Polished and unetched.
Technique
Scanning electron microscopy (SEM) in backscattered electron imaging (BEI) mode
Length bar
30 μm
Further information
Note the two phase microstructure formed on calcining the single phase dolomite ore. The light continuous matrix is lime (CaO or calcia) while the dark isolated phase is periclase (MgO or magnesia).
Contributor
Prof W E Lee
Organisation
Department of Engineering Materials, University of Sheffield
Date
02/09/02
Licence for re-use
Attribution-NonCommercial-ShareAlike 4.0 International