摘要
将掺Ca铬酸镧与Al2O3混合,在1650℃烧结得到氧化铝量从0~100%（摩尔分数）的系列Al2O3/La0.9Ca0.1CrO3复合材料烧结体。研究得出Al2O3/La0.9Ca0.1CrO3系统是热力学不稳定的,高温烧结时存在离子扩散,烧结体的最终相组成与Al2O3量有关。复合材料中氧化铝含量较低时（≤20%,摩尔分数）可以提高铬酸镧粉体的烧结性能;当氧化铝含量在30%~70%（摩尔分数）之间时,生成的层片状六铝酸镧使烧结致密度降低,并在氧化铝含量为70%（摩尔分数）时达到最低值,随后试样的相对密度又逐渐增大。
A series of Al2O3/La0.9Ca0.1CrO3 composite sintered bodies were prepared by sintering the mixture of Ca-doped lanthanum chromate and alumina at 1650 ℃,with content of Al2O3 from 0 to 100 mol%.It was generalized that the system of Al2O3/La0.9Ca0.1CrO3 results in thermodynamic unstablity with visible cation diffusion at high temperature,and the final phase composition of sintered bodies depends on the alumina content.Alumina addition with low content（≤20mol%）） in the composite can improve the sintering property of La0.9Ca0.1CrO3 powders.When Al2O3 content is between 30mol% and 70mol%,plate-like lanthanum hexaaluminate is generated,which can cause the lower degree of density to the sintered bodies.The relative density reaches its minimum value when Al2O3 content is 70mol% and gradually increases with the increasing of α-Al2O3 content.
出处
《稀土》
EI
CAS
CSCD
北大核心
2010年第5期28-32,共5页
Chinese Rare Earths
基金
高等学校博士学科点专项科研基金(20050422026)
关键词
铬酸镧
氧化铝
复合材料
烧结
lanthanum chromate
alumina
composite
sinter
