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Effect of firing conditions of magnesia carbon brick on brick performance and microstructure
Magnesia carbon brick performance due to different firing conditions will be greater changes in Japan Kurosaki broadcasting company's technical staff to study the mechanism of changes in the performance of magnesia brick to graphite content of 8% of low-graphite magnesia brick-based , By changing the firing time, investigated the thermal shock resistance of magnesium carbon brick, matrix structure and composition of the distribution changes.
Magnesia carbon brick performance due to different firing conditions will be greater changes in Japan Kurosaki broadcasting company's technical staff to study the mechanism of changes in the performance of magnesia brick to graphite content of 8% of low-graphite magnesia brick-based , By changing the firing time, investigated the thermal shock resistance of magnesium carbon brick, matrix structure and composition of the distribution changes.
The sample was made of 8% flake graphite and 92 fused magnesia, plus 1% 99 metal aluminum powder into magnesia-carbon bricks, and calcined at 1400 ℃ for 10h and 30h, respectively. Thermal shock and tissue changes. Thermal shock resistance test is immersed in the molten iron at 1600 ℃ for 90s, then cooled for 30s and recycled for 3 times. The appearance of the test piece and the cracked area were compared. The microstructure of the matrix was observed using FE-SEM, EDS.
After observing the cross-sectional picture of the sample after the thermal shock resistance test, it was found that the sample burned after reduction for 30 hours produced obvious cracking and poor thermal shock resistance. The distribution of aluminum, magnesium, silicon and calcium in the sample matrix sintered at 30h shows the micrographs of the magnesium spinel which was originally the fine powder. In addition, there are still silicon and calcium in the other parts. This shows that due to the prolonged firing, the positive secondary bonding in the matrix, together with the high impurity content, contributes to the sintering of the low melt resulting in an increase in the elastic modulus and a decrease in the thermal shock resistance.
The sample was made of 8% flake graphite and 92 fused magnesia, plus 1% 99 metal aluminum powder into magnesia-carbon bricks, and calcined at 1400 ℃ for 10h and 30h, respectively. Thermal shock and tissue changes. Thermal shock resistance test is immersed in the molten iron at 1600 ℃ for 90s, then cooled for 30s and recycled for 3 times. The appearance of the test piece and the cracked area were compared. The microstructure of the matrix was observed using FE-SEM, EDS.
After observing the cross-sectional picture of the sample after the thermal shock resistance test, it was found that the sample burned after reduction for 30 hours produced obvious cracking and poor thermal shock resistance. The distribution of aluminum, magnesium, silicon and calcium in the sample matrix sintered at 30h shows the micrographs of the magnesium spinel which was originally the fine powder. In addition, there are still silicon and calcium in the other parts. This shows that due to the prolonged firing, the positive secondary bonding in the matrix, together with the high impurity content, contributes to the sintering of the low melt resulting in an increase in the elastic modulus and a decrease in the thermal shock resistance.
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