Study on sintering characteristics of block magnesite

The sintering characteristics of block magnesite with different sizes were investigated. The results show that after firing in 400-800°C, the smaller size of the specimens, the higher the decomposition rate and activity of the specimens, as well as the faster decreasing of the bulk density. Sintering of the specimens did not start when fired in 800-1000°C. The sintering speed of the specimens is slow fired in 1000-1300°C, the bulk density increases to 2.00 g/cm3, because magnesite pseudomorph impedes the diffusion of particle during solid sintering. However, the sintering speed increases in 1300-1600°C, the solid sintering turns to liquid sintering, and the bulk density increases to 2.60 g/cm3. Sintering speed of the specimens increases rapidly fired at 1600°C or higher. The specimens are densified in the completely liquid sintering, bulk density increases to 3.27 g/cm3. The size of specimens have little effect on the final bulk density fired at 1800°C. © right.