Directly bonded magnesia-chrome bricks are products made from high-purity or sub-high-purity sintered or fused magnesia and chromium concentrate. Direct bonding refers to a bonding produced by direct contact between solid phase crystal grains. The brick is made of high-purity sintered magnesia and chromium concentrate with SiO2<2% as raw materials and sintered at high temperature. The direct bonding degree of the product increases with the decrease of the SiO2 content and the increase of the firing temperature.
