In order to study the mechanism of MgO-C changes in performance, Japan Kurosaki Harima company's technical staff make
8% lower graphite-based MgO-C brick as test material, by changing the firing time to investigate the thermal shock resistance of MgO-C, the matrix organizational structure and changes in composition distribution.
Compare the case of the test piece cracks appearance and cross section appears. Microstructure of the matrix using FE-SEM, EDS observation.
Sectional image of the test sample after the thermal shock shows that 30h firing sample is with obvious cracks and poor thermal shock resistance.
the original fine powder of magnesium, silicon and calcium are still there.
causing low melting material sintering, resulting in increased of elastic modulus, so thermal shock resistance is lowered.
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