CORROSION SCIENCE
·
2024
·
IF 7.4
Pengsen Zhao,Haizhong Zheng,Guifa Li,Yongxiang Geng,Yixin Xiao,Hongbo Guo,Gang Wang,Shixian Zhao,Ping Peng
The thermal cycling behavior of Yb 3+ -Ce 4+ -La 2 Zr 2 O 7 /YSZ (LYZCO/YSZ) TBCs was systematically investigated via experiment and first-principles calculation. Results suggest that ceramic grain boundary cracking is the root cause of LYZCO/YSZ TBCs thermal cycle failure. Compared to La 2 Zr 2 O 7 /YSZ TBCs, LYZCO/YSZ TBCs own an outstanding thermal cycle life at 1100 ℃, which is attributed to LYZCO's higher TEC (10.431×10 −6 /K, 1100 ℃) and lower thermal conductivity (1.299 W/(m·K), 1100 ℃). Furthermore, Griffith's separation work of the LYZCO/YSZ interface is merely −0.576 J/m 2 , implying that the LYZCO/YSZ TBCs are particularly prone to cracking at this interface. Weakly bonded La-O is the first site at this interface cracking.
研究领域:
材料科学
·
计算物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Bowen Zha,Xinhui Huang,Liangbin Lin,Hongyu Guo,Fafu Yang
Although some detection methods for folic acid have been developed based on the conventional instruments, the rapid, simple and in-situ detection for folic acid was rarely reported. In this work, a “turn-on” and “color-changing” fluorescence sensor ( TBCS ) on detecting folic acid was designed and synthesized. TBCS emits the green fluorescence, which transferred to the strong blue fluorescence after binding folic acid. The high sensing selectivity was observed among various ions and biomolecules. The detection limitation of TBCS for folic acid was 4.32 × 10 −7 M. The sensing mechanism was proposed as that the ICT effectiveness of TBCS was interrupted by sensing folic acid. The application experiments on test paper, folic acid tablets and simulated sample displayed the good in-situ detecting ability of TBCS for folic acid, suggesting the good application prospect on rapid, simple and in-situ detecting folic acid in real environments.
研究领域:
分析化学
·
生物医学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 108
·期 11
·e70112
·
IF 3.8
Bin Liu,Na Zhang,Cui Zhou,Sikai Wang,Jialin Li,Tiefeng Du,Luchao Sun,Jingyang Wang
Rare-earth aluminate (REAlO 3 ) has emerged as a highly promising candidate material for thermal barrier coatings due to its remarkable properties such as high thermal stability and low thermal conductivity. In this study, a novel quaternary rare-earth aluminate, (La 0.25 Sm 0.25 Gd 0.25 Ho 0.25 )AlO 3 , was synthesized via entropy-driven design. Its phase composition and mechanical and thermal properties were systematically investigated. The findings indicate that this material exhibits enhanced ductility with a shear modulus of 114.63 GPa and a Pugh's ratio of 0.63, surpassing that of single-principal element REAlO 3 ceramics. Furthermore, it demonstrates a reduced thermal conductivity of 4.11 W m −1 K −1 at room temperature and a coefficient of thermal expansion of 10.10 × 10 −6 K −1 from 25°C to 1300°C, which is well matched to superalloy substrates.
研究领域:
材料科学
·
陶瓷材料
·
热工学
·
固态物理学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Pengsen Zhao,Haizhong Zheng,Guifa Li,Yongxiang Geng,Yixin Xiao,Hongbo Guo,Ping Peng
The CaO–MgO–Al 2 O 3 –SiO 2 (CMAS) corrosion resistance of La 3+ -Yb 3+ -Ce 4+ co-doped ZrO 2 (LYZC) ceramic was systematically discussed via experiment and first-principles calculation. Results demonstrate that at the CMAS/RE-ZrO 2 interface, RE is dissolved in molten CMAS to form some RE-apatite particles, which effectively inhibits CMAS penetration. Compared with La 3+ doped ZrO 2 (LZ), LYZC owns a better ability to maintain the coating microstructure under CMAS corroded, which is conducive to alleviating CMAS penetration. This conclusion is also confirmed by the low diffusion coefficients ( D ) of RE and Zr in CMAS/LYZC(111), which are only 2.305–5.556 × 10 −8 m/s and 2.694–3.421 × 10 −8 m/s, respectively. Furthermore, the small electrostatic potential difference (Δ V = 1.578–1.654 eV) of the CMAS/LYZC(111) terminal layer suggests that molten CMAS does not easily adhere to the LYZC surface.
研究领域:
材料科学
·
理论计算
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Xinyuan Li,Yixin Xiao,Haizhong Zheng,Peifeng Zhou,Guifa Li,Yongxiang Geng,Mengxue Xia
Yb 3+ -Ce 4+ -La 2 Zr 2 O 7 / yttria stabilized zirconia (LYZCO/YSZ) thermal barrier coatings (TBCs) are susceptible to corrosion by high-temperature CMAS (calcium-magnesium-aluminosilicate). In this paper, a femtosecond laser was used to modify periodic raised structures (with a base diameter of 100 μm, a height of 120 μm, and an interval of 70 μm) on the surface of the glazed LYZCO/YSZ coating. The results show that by introducing raised microstructures on the glaze layer, the stable contact angle of molten CMAS significantly increases from 28° (unmodified) to 73° (modified). After corrosion at 1250 °C for 1 h and 2 h, the average reaction layer thickness of the modified glazed coating (LC-LYZCO/YSZ) was 8.0 ± 1 μm and 11.0 ± 1 μm, respectively. Compared with the unmodified glazed coating (LG-LYZCO/YSZ), this corresponds to a reduction of ∼28% and ∼21% in thickness. This structure effectively delays the wetting and penetration of high-temperature CMAS by suppressing the lateral diffusion rate of CMAS and intensifying the interfacial reaction, providing a novel technical insight for the research on the resistance of TBCs to CMAS corrosion.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Yang Feng,Yong Shang,Yanling Pei,Guanghua Liu,Jian Sun,Yang Lu,KeKe Chang,Shengkai Gong,Huibin Xu
The corrosion behavior of yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) under the synergistic effect of calcium-magnesium-alumina-silicate (CMAS) and NaCl under near-service conditions (the flame temperature can reach 1900°C and the flame speed can reach 0.5Mach) was investigated using a burner rig. The results indicated that when the surface temperature of the top coating (TC) (∼1200°C) was lower than the melting point of the CMAS, after thermal shock in a water environment, the phase of the CMAS on the TC surface remained stable, and the CMAS did not penetrate the TC interior. However, after thermal shock in a NaCl environment, the presence of NaCl disrupted the silicate network structure of CMAS, lowering its melting point and viscosity; meanwhile, the high-speed flame (0.5 Mach) promoted the penetration of CMAS melt into the TC, resulting in a porosity decrease in TC from 8.4 ± 0.88% to 6.92 ± 0.53%. The dominant mechanism of CMAS infiltration into TC changed from capillary-driven to a combined capillary-dynamic process. Meanwhile, the transformation of the chain-structured diopside (Ca(Mg, Al)(Si, Al) 2 O 6 ) in the CMAS to the island-structured magnesium feldspar (Ca 2 MgSi 2 O 7 ). Additionally, NaCl accelerated the formation of the non-protective oxide Cr 2 O 3 in the thermally grown oxides layer. This study provides new insights into the corrosion protection and performance optimization of TBC systems under near-service conditions.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）