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CORROSION SCIENCE · 2022 · IF 7.72

Calcium magnesium aluminosilicate (CMAS) corrosion behaviors of apatite Ca2La8(SiO4)6O2 thermal barrier coating material

Longkang Cong,Wei Li,Yao Guo,Jiancheng Wang,Qiang Song,Shengyue Gu,Shouyang Zhang

The calcium magnesium aluminosilicate (CMAS) attack is becoming a critical obstacle to the application of thermal barrier coatings (TBCs). In this work, we prove that Ca 2 La 8 (SiO 4 ) 6 O 2 is an effective TBCs material for resisting CMAS attack, and investigates its CMAS corrosion behaviors. The results indicate that no evidence of chemical reactions was found between CMAS and Ca 2 La 8 (SiO 4 ) 6 O 2 heat-treated at 1300 °C and 1500 °C. The corrosion of apatite by CMAS occurs via dissolution and re-precipitation processes. At 1300 °C, the apatite Ca 2 La 8 (SiO 4 ) 6 O 2 substrates have little evidence of damage. Moreover, the apatite can also effectively block the infiltration of CMAS up to 1500 °C.

研究领域: 材料科学 · 热力学

✓ 已验证 DOI 高影响因子

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Scientific Reports · 2019 ·Vol. 9 ·期 1 ·1-9 · IF 4.011

High Thermal Stability Apatite Phosphors Ca2La8(SiO4)6O2:Dy3+/Sm3+ for White Light Emission: Synthesis, Structure, Luminescence Properties and Energy Transfer

Liu Ning,Mei Lefu,Liao Libing,Fu Jie,Yang Dan

What ideal w-LED phosphors always aim to do is to achieve a single phase near-sunlight emission phosphor simultaneously with both high luminescence efficiency and high thermal stability at operation temperature. And It is well known that apatite compound phosphors are one of the most promising optical materials to realize those above because of their unique structure enhanced luminescence properties and thermal stability. Here, we synthesized a co-doped single phase apatite phosphors Ca 2 La 8 (SiO 4 ) 6 O 2 :Dy 3+ /Sm 3+ (CLSO:Dy 3+ /Sm 3+ ) for white light emission, which was provided with excellent thermal stability and of which luminescence intensity at 150 °C still was 92 percentage of that at room temperature. Moreover, X-ray diffraction technique, Fourier transform infrared spectroscopy, scanning electron microscope were employed to characterization of phase structure and morphology, and consequently pure apatite structure and gravel-like morphology of phosphors were proved. Analysis of photoluminescence spectra indicated that concentration quenching effect exist in single-doped CLSO:Dy 3+ phosphors owing to dipole-dipole interaction between Dy 3+ ions. It is revealed that maybe exist Dy 3+ ↔ Sm 3+ bilateral non-radiative energy transfer processes in Dy 3+ /Sm 3+ co-doped CLSO system by PL spectra and decay curves. And variation of Sm 3+ ion concentration can control color emission, namely CIE chromaticity coordinates and correlated color temperature, finally to achieve white light emission (0.309,0.309) with CCT 6848 K, able to be a potential candidate for commercial lighting applications.

CAS / MDL: 12060-58-1 471-34-1 1308-87-8 1312-81-8 7631-86-9 112945-52-5 60676-86-0

研究领域: 材料科学 · 光电 · 固体物理 · 化学

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Calcium magnesium aluminosilicate (CMAS) corrosion behaviors of apatite Ca2La8(SiO4)6O2 thermal barrier coating material

High Thermal Stability Apatite Phosphors Ca2La8(SiO4)6O2:Dy3+/Sm3+ for White Light Emission: Synthesis, Structure, Luminescence Properties and Energy Transfer