钛酸铝固溶体陶瓷的制备与性能

PREPARATION AND PROPERTIES OF ALUMINUM TITANATE SOLID SOLUTION CERAMICS

用工业级原料采用固相反应法合成了钛酸铝固溶体[Al2(1-0.2)Mg0.2Ti1+0.2O5]。研究了氧化镁(MgO)在钛酸铝(Al2TiO5)结构中的固溶对粉体合成的影响,通过测量Al2(1-0.2)Mg0.2Ti1+0.2O5陶瓷的体密度、热膨胀系数和抗弯强度,进一步研究了其烧结行为、热膨胀行为和机械性能。结果表明:由于MgO的固溶,在相对较低的温度(1300℃)煅烧便合成纯相Al2(1-0.2)Mg0.2Ti1+0.2O5粉体,并且具有良好的烧结活性。用1380℃合成的粉体,经1450℃保温4h烧结的Al2(1-0.2)Mg0.2Ti1+0.2O5陶瓷,不仅具有低膨胀特性,而且有足够高的抗弯强度。

Synthesis of aluminum titanate solid solution [Al2（1-0.2）Mg0.2Ti1＋0.2O5] powders was realized by the solid state reaction with industrial raw materials. Effects of the solid resolution of magnesia （MgO） in the crystalline structure of aluminium titanate （Al2TiO5） on the synthesis of Al2（1-0.2）Mg0.2Ti1＋0.2O5 powder were studied, and then the sintering behavior, thermal expansion behavior and mechanical properties of Al2（1-0.2）Mg0.2Ti1＋0.2O5 ceramics were also investigated by measuring the density, thermal expansion coefficient and fracture strength. The results show that because of the solid resolution of MgO, pure phase Al2（1-0.2）Mg0.2Ti1＋0.2O5 solid solution powder with good sintering activity can be synthesized by calcination at temperatures as low as 1 300 ℃. The Al2（1-0.2）Mg0.2Ti1＋0.2O5 ceramics prepared with powder calcined at 1 380 ℃ by sintering at 1 450℃ for 4 h not only exhibit low thermal expansion behavior but also have moderate bending strength.