α-Al_2O_3纳米粉的烧结动力学

SINTERING KINETICS OF NANOCRYSTALINE α-Al_2O_3 POWDER

采用等速升温烧结及常规烧结方法对平均粒径约10nm的α-Al2O3纳米粉的烧结动力学进行了研究．等速升温烧结实验表明，坯体致密化主要发生在1200—1450℃范围内．粉体经1400℃，2h的常规烧结后，相对密度达到98．85％．理论分析表明，提高生坯密度，改善其显微结构均匀性有可能大幅度降低该粉体的烧结致密化温度．

Constant heating rate sintering and conventional sintering methods were used to investigate the sintering kinetics of α-Al2O3 powder with a mean particle diameter of 10 nm.Constat heating rate (10℃ /min) sintering shows that densilication of the greenbody mainly occurs between 1200 and 1450℃. Relative density of the specimen is 98.85% after conventional sintering at 1400 ℃ for 2 h. Theoretical analysis indicates that further increase of the greenbody density and improvement of microstructural homogeneity could lead to a substatial decrease of sintering temperature of the powder.