Performance Research of Magnesium Base Lanthanum Hexaaluminate Prepared by Co-Precipitation
Li Ying1,2; Sun Chao1; Gong Jun1
Corresponding AuthorSun Chao(
AbstractThermal 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.
Keywordmagnetoplumbite phase lanthanum hexaaluminate crystal structure atomic bonding
Funding OrganizationNational Natural Science Foundation of China
Indexed BySCI
Funding ProjectNational Natural Science Foundation of China[51301180]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000464751100012
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorSun Chao
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
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.
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