【摘要】 通过固相法以MgO·2TiO2 为稳定剂合成了Al2 ( 1 -x) MgxTi1 +xO5(简称AMT) (x =0 ,0 .0 1,0 .0 5 ,0 .1,0 .3 )体系固溶体粉末。研究了该固溶体粉末的物相组成、以及热分解性能与x值变化的关系。采用无压烧结法对制备的固溶体AMT粉末进行烧结 ,用热膨胀仪测试了烧结体热膨胀性能。粉末X射线衍射结果表明随着x值的增大 ,固溶体AMT晶格常数线性增大、热稳定性越高。当x =0 .0 5时 ,将该固溶体在 110 0℃保温 10个h ,仅有 9%的分解率。通过热膨胀仪测试烧结体 ,其结果表明在室温至 5 5 0℃范围内AMT体系的热膨胀率均小于零。当x =0 .1时 ,固溶体AMT有相对较低的热膨胀率 ,并对其原因进行了分析。更多还原

【Abstract】 The thermal performance of AT with additive MgO·2TiO 2 was studied in order to restrain the decomposition of AT. The solid solutions Al 2(1- x ) Mg x Ti 1+ x O 5( x =0,0.01,0.05,0.1,0.3)were fabricated by a solid state reaction method. The solid solution powders were sintered under the normal pressure. The relation of x values and the components and thermal performance of the solid solution was investigated. The results indicate that with the augment of the x values the crystal lattice constants and thermal stability increased. When x value is 0.05 the compositional fraction of AT is only 9% at the temperature of 1 100 ℃ for ten hours. Finally, thermal expansion of the sintered specimens was studied.更多还原