期刊
CERAMICS INTERNATIONAL
卷 46, 期 18, 页码 27967-27972出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.07.290
关键词
LaPO4; LaMgAl11O19; Compatibility; Thermal conductivity
资金
- National Natural Science Foundation of China [51902092, 51902279]
- Natural Science Foundation of Hunan Province [2020JJ6041]
- Key Program of Education Department of Hunan Province [19A068]
- Key-Area Research and Development Program of Guangzhou [202007020008]
- Foundation of Hengyang Normal University [18D07]
- Foundation of Key Laboratory of Functional Metal-Organic Compounds of Hunan Province [MO19K07]
- Centre for the Functionalization of Metal-Organic Frameworks Materials Studies
As a toughening agent, LaPO4 has been used to improve several properties of ceramics. In such applications, its compatibility with the matrix material should be considered first. In this study, the compatibility of LaPO4 and magnesium lanthanum hexa-aluminate (LaMgAl11O19, LMA) was elucidated at temperatures ranging from room temperature to 1600 degrees C. The compositions, thermal stabilities, thermal conductivities and microstructures of the above-mentioned materials were analysed using X-ray diffraction, thermogravimetry-differential scanning calorimetry, thermal conductivity tester and scanning electron microscopy. The results indicated that the two materials maintained a good compatibility at temperatures lower than 1600 degrees C. At 1600 degrees C, the diffusion of La was observed to alter the chemical composition of LaPO4 and accelerate its reaction with LMA, leading to the formation of LaAlO3 and magnesium lanthanum aluminium oxide, resulting in the increase of thermal conductivity.
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