期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 94, 期 10, 页码 3195-3197出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1551-2916.2011.04761.x
关键词
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资金
- National Natural Science Foundation of China (NSFC) [51002038, 51021002]
- Fundamental Research Funds for the Central Universities [HIT.BRET1.2010006]
LaMAl11O19 (M = Mg, Mn, Fe) ceramics are fabricated by pressureless-sintering method at 1700 degrees C for 10 h in air. The microstructure and thermo-optical properties of LaMAl11O19 ceramics are studied by the X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy measurements. The transition metallic elements such as Mn and Fe at M2+ site can effectively enhance the emissivity of LaMAl11O19 ceramics at short wavelengths. LaFeAl11O19 has the highest emissivity value of more than 0.8 in the wavelength range of 2.5-6 mu m at 500 degrees C. However, the measured emissivity of different LaMAl11O19 ceramics shows a similar trend in the wavelength range of 6-14 mu m. LaFeAl11O19 is a promising protective coating material for metallic thermal protection system due to its high emissivity of above 0.7 over the whole wavelength range of 2.5-14 mu m at temperatures up to 900 degrees C.
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