Influence of Aluminum Contents on Phase Behavior and Properties of TiN-Sialon-Corundum Composites by ASuminothermic Reduction Nitridation

摘要

TiN-Sialon-Corundum composites were synthesized from rutile and quartz by aluminothermic reduction nitridation (ARN) method. The effects of aluminum contents on the phase behavior and properties of products were investigated. At 1500°C, the main phases of products ARNed for 4 h were large granular corundum, TiN and hexagonal columnar Si_3Al_3O_3N_5. In addition, small TiN crystal particles distributed around the Si_3Al_3O_3N_5. It suggested that TiN-Sialon-Corundum composites were successfully fabricated by ANR method at 1500°C for 4h. With increases in the amount of aluminum contents, the compressive strength ,the flexural strength and the bulk density of the composite refractory increased while the apparent porosity decreased. When the the aluminum contents increased to 48.90%, the composites had the highest compressive strength (47.34 MPa), flexural strength (27.70MPa), bulk density (2.27 g/cm~3) and had the lowest apparent porosity (27.57 %).