向氧化铝陶瓷中添加总量固定、但m(CuO)/m(TiO2)不同的CuO--TiO2复合助剂, 研究其对氧化铝陶瓷烧结性能、微观结构以及物相组成的影响, 揭示复合助剂的低温烧结机理. 结果表明, CuO与TiO2不易发生化合反应, 分别以液相烧结和固相反应烧结来促进氧化铝陶瓷的致密化进程; TiO2与AL2O3反应生成A12Ti7O15的固相烧结, 比CuO的液相烧结更能有效地促进陶瓷的晶粒生长与致密化. 在TiO2固相烧结的基础上适当引入CuO液相, 能够最大程度地降低氧化铝陶瓷的烧结温度; 当在50 g Al2O3粉体中添加总量为0.025 mol的CuO--TiO2复合助剂, 并使m(TiO2)/m(CuO+TiO2)为0.80时, 氧化铝陶瓷在1250 ℃烧结后其密度达到理论密度的98%以上.
The effects of CuO and TiO2 additives on the sintering behavior, microstructure, phase composition and the mechanism of lowering the sintering temperature of Al2O3 ceramics have been investigated. It was difficult to take place for the combination reaction between CuO and TiO2, and the sintering densification of alumina ceramic was greatly enhanced by the addition of CuO as a liquid phase sintering aid and TiO2 as a solid–state reaction sintering aid. The reaction between TiO2 and Al2O3 resulted in the solid–state reaction sintering process, which was more effective to lower the sintering temperature of Al2O3 ceramic than the liquid phase sintering process by the addition of CuO. Adding 0.025 mol CuO–TiO2 (the molar ratio of TiO2 to CuO–TiO2 was 0.80) into 50 g Al2O3 powders, the alumina ceramic achieved compact structure at 1250 and reached above 98% of the theoretical density.
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