摘要
Al_(4)SiC_(4)was prepared using Al powder,silicon carbide powder,and graphite as raw materials,and silicon as the additive by microwave sintering.Effects of silicon additions(0,5%,10%and 15%,by mass)on the phase composition,microstructure,apparent porosity and bulk density of the Al_(4)SiC_(4)sample prepared with different aluminum additions(20%,25%,by mass)were researched.Then the developed Al_(4)SiC_(4)samples were applied to MgO-C bricks to investigate the effect on the oxidation resistance and mechanical properties of the MgO-C bricks.The results show that Al_(4)SiC_(4)can be synthesized at lower temperatures using the microwave sintering method.The sample with 20%aluminum addition has a lower Al_(4)SiC_(4)content than the one with 25%aluminum.When the silicon addition is 10%and the aluminum addition is 25%,the sample appears needlelike system,the porosity is only 28.69%,and the sample is dense.The developed Al_(4)SiC_(4)was added into MgO-C bricks as the antioxidant,which greatly increased the oxidation resistance and the mechanical properties of the MgO-C bricks.
