Effect of Y_2O_3 Addition on Synthesis of AIN Powder by Carbothermal Reduction-Nitridation of Al_2O_3

摘要

The effect of Y_2O_3 on the synthesis of AIN by the carbothermal reduction-nitridation of Al_2O_3 was investigated. The amount of Y_2O_3 addition was varied from 0 to 7.50 mass percent. Nitridation was carried out at 1450 deg C for 0-360 min in N_2 flow. The grain sizes of synthesized powders were almost same regardless of the amount of Y_2O_3 addition. The synthesized AIN powders appeared round shape. From XRD analysis, Y_4Al_2O_9 was identified as an intermediate compound during nitridation. It was confirmed to be finally converted to Y_2O_3 after nitridation. Therefore this synthesized powder is considered to be advantageous to densification because the remaining Y_2O_3 acts as a sintering aid.