Study on the process of fused magnesia-aluminum-iron spinel

Put the dried magnesium iron aluminum spinel brick and magnesium olivine composite brick green into a high temperature furnace, raise the temperature to 1550 ℃, and then keep it for 5 hours for firing treatment. Made of magnesium iron aluminum spinel brick and magnesium olivine composite brick, take out after cooling, take photos, and then test. At different temperatures of 1500 ℃ and 1550 ℃, the linear change rate after firing of the composite brick of magnesium iron aluminum spinel and magnesium olivine. They are the composite brick samples of fused magnesia-alumina-iron spinel and magnesia-olivine brick and the composite brick samples of sintered magnesia-alumina-iron spinel and magnesia-olivine brick at the firing temperature of 1500 ℃. They are the composite brick samples of fused magnesia-alumina-iron spinel and magnesia-olivine brick at 1550 ℃ and sintered magnesia-alumina-iron spinel and magnesia-olivine brick. At the same sintering temperature, the linear change rate after burning of the composite brick of fused magnesia-alumina spinel and magnesia-olivine brick is lower than that of the composite brick of sintered magnesia-alumina spinel and olivine brick.

The linear change rate of magnesia-alumina-iron spinel brick and olivine composite brick of the same material increases with the increase of its firing temperature. The linear change rate after sintering of magnesium iron aluminum spinel and magnesium olivine composite brick at different sintering temperatures. Linear expansion of magnesia-alumina spinel brick and high-purity magnesia-olivine brick Linear expansion of high-purity magnesia-olivine brick and magnesia-alumina spinel brick. The thermal expansion curve of the fused magnesium-iron aluminum-iron spinel brick sample after firing. From room temperature to about 1500 ℃, the linear expansion rate gradually increases, and at about 1500 ℃, the linear expansion rate shows a large Z value, without obvious decrease. Therefore, the linear expansion rate of fused magnesia iron aluminum spinel brick increases steadily from room temperature to 1500 ℃.