The dried mafic spinel bricks and forsterite composite bricks were placed in a high-temperature furnace, heated to 1550 DEG C, and kept in heat for 5 hours for firing. Magnesium-iron-aluminum spinel brick and forsterite composite brick were made and taken out for photographing after cooling, and then tested. At different temperatures of 1500°C and 1550°C, the rate of change after firing of mafic spinel and forsterite composite bricks. The composite brick specimens of the fused magnesite-alumina-spinel and forsterite bricks, and the composite brick specimens of sintered magnesite-alumina spinel and forsterite bricks were respectively used. The composite brick specimens of the fused magnesite-alumina-spinel and forsterite bricks and the composite brick specimens of the sintered magnesite-alumina spinel and forsterite bricks are respectively used for the firing temperature of 1550C. At the same sintering temperature, the post-fired line change rate of the fused magnesite-alumina spinel and forsterite brick composite tiles is lower than that of the sintered magnesite-alumina spinel and olivine brick composite bricks. rate.
In the same material of magnesium aluminate iron spinel brick and olivine composite brick, the line change rate increases with the increase of the firing temperature. Rate of change after firing of Mg-Fe-Al spinel and forsterite composite bricks with different sintering temperatures. Magnesium-iron-aluminum spinel bricks and high-purity magnesium olivine bricks' linear expansion of high-strength magnesium olivine bricks and magnesium-magnesium-aluminum spinel bricks. The thermal expansion curve of the fused fused magnesium-iron-aluminum-iron spinel brick sample after firing. From about room temperature to about 1500°C, the linear expansion rate gradually increased, and at about 1500°C, the linear expansion rate showed a large maximum without any significant decrease. Therefore, the rate of linear expansion of fused magnesite-alumina spinel bricks from room temperature to 1500°C is steadily increasing.
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