Performance Research of Magnesium Base Lanthanum Hexaaluminate Prepared by Co-Precipitation

doi:10.11900/0412.1961.2018.00448

CORC > 金属研究所 > 中国科学院金属研究所

	Performance Research of Magnesium Base Lanthanum Hexaaluminate Prepared by Co-Precipitation
	Li Ying 1,2; Sun Chao 2; Gong Jun 2
刊名	ACTA METALLURGICA SINICA
	2019-05-11
卷号	55 期号:5 页码:657-663
关键词	magnetoplumbite phase lanthanum hexaaluminate crystal structure atomic bonding
ISSN号	0412-1961
DOI	10.11900/0412.1961.2018.00448
通讯作者	Sun Chao(csun@imr.ac.cn)
英文摘要	Thermal barrier coatings are widely used on turbine blades to provide high temperature insulation, oxidation and corrosion protection. Thermal barrier coatings are composed of matrix, oxide layer, bonding layer and ceramic layer. The lanthanum magnesium hexaaluminate with magnetoplumbite structure have a high aspect ratio, large specific surface area and strong resistance to high temperature sintering, and it can be used as ceramic layer of thermal barrier coatings. In this work, the former powders of lanthanum magnesium hexaaluminate was prepared at synthesized temperature of 60 degrees C , pH= 11.5. Comparing with the conventional chemical co-preparation synthesis, the synthesized temperature was raised and the pH value for synthesizing was reduced, which resulted in improving production efficiency of former powders. And the lanthanum magnesium hexaaluminate powders for ceramic layer of thermal barrier coating was prepared after the precursor powders were calcinated at 1500 degrees C for 5 h. The phase structure of reaction products, morphology of the powders, full width at half maximum and spectral intensity were analyzed by XRD, SEM, TEM and XPS. The results showed that the magnetoplumbite structured formation generation was elevated much more efficiency if the former powders were precipitated at higher temperature. Since the bonding energy of La, Mg, Al and O atoms increased, the kinetic energy of electrons decreased, therefore, chemical composition of the reaction products were steady near 1500 degrees C. During the crystallization process of lanthanum magnesium hexaaluminate, the spinel layer was generated firstly and mirror layer was consequently produced. In the process of producing pure magnetoplumbite phase powders, the full width at half maximum of LaAlO3 formula and MgAl2O4 formula were increased and the activation energy of the crystal structure was higher than that before reaction, which was beneficial to improve anti-sintering performance and thermal stability of the ceramic coating.
资助项目	National Natural Science Foundation of China[51301180]
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000464751100012
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/132788]
专题	金属研究所_中国科学院金属研究所
通讯作者	Sun Chao
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Li Ying,Sun Chao,Gong Jun. Performance Research of Magnesium Base Lanthanum Hexaaluminate Prepared by Co-Precipitation[J]. ACTA METALLURGICA SINICA,2019,55(5):657-663.
APA	Li Ying,Sun Chao,&Gong Jun.(2019).Performance Research of Magnesium Base Lanthanum Hexaaluminate Prepared by Co-Precipitation.ACTA METALLURGICA SINICA,55(5),657-663.
MLA	Li Ying,et al."Performance Research of Magnesium Base Lanthanum Hexaaluminate Prepared by Co-Precipitation".ACTA METALLURGICA SINICA 55.5(2019):657-663.