CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Wenqi Yang,Fuxing Ye
Because the CMAS corrosion and phase transformation at elevated temperatures above 1250 °C have limited the applications of traditional YSZ , the design of novel thermal barrier materials is a hotspot. GdTaO 4 is considered as a type of potential novel thermal barrier material owing to its low thermal conductivity . In this study, the mechanical and thermal properties, CMAS corrosion resistance , and the wettability of the GdTaO 4 were studied and compared with that of YSZ. The results show that the coefficient of thermal expansion and hardness of GdTaO 4 are 14.1 × 10 −6 K −1 (1350 °C) and 534.2 Hv 0.3 respectively. The thickness of CMAS reaction layer of GdTaO 4 is ~30.8 μm after 24 h reaction at 1350 °C, which is thinner than that of YSZ. After corrosion reaction, the CMAS glass aggregated instead of completely disappearing or continuously extending over the surface of GdTaO 4 . The main reaction product is Ca 2 Ta 2 O 7 , and the anorthite phase may not be detected, which is similar to YTaO 4 . By comparison, the dense substrate of YSZ became porous and CMAS glass has disappeared after 10 h. CMAS corrosion at 1350 °C. The on-line contact angle results show that the wettability of CMAS on GdTaO 4 is worse than that on YSZ at 1350 °C, while the opposite of the work of adhesion, which indicates that GdTaO 4 can remove liquid CMAS more easily than YSZ TBCs during the service. Furthermore, the corrosion depth and areas of GdTaO 4 are smaller than those of YSZ in the same situation. These findings suggest that GdTaO 4 possesses better high-temperature properties and CMAS corrosion resistance than YSZ as a kind of potential of thermal barrier material.
研究领域:
材料科学
·
高温材料
·
腐蚀科学
✓ 已验证
DOI
高影响因子
SENSORS
·
2016
·Vol. 16
·期 3
·369
·
IF 2.033
Liwei Liu,Zheng Zhou,He Tian,Jixue Li
Bismuth oxide (Bi2O3)-doped yttria-stabilized zirconia (YSZ) were prepared via the solid state reaction method. X-ray diffraction and electron diffraction spectroscopy results indicate that doping with 2 mol% Bi2O3and adding 10 mol% yttria result in a stable zirconia cubic phase. Adding Bi2O3as a dopant increases the density of zirconia to above 96%, while reducing its normal sintering temperature by approximately 250 °C. Moreover, electrical impedance analyses show that adding Bi2O3enhances the conductivity of zirconia, improving its capability as a solid electrolyte for intermediate or even lower temperatures.Keywords:solid electrolyte;ionic conductivity;YSZ;bismuth oxide
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Zhuo Chen,Xiufang Cui,Yongchao Fang,Chao Yan,Rui Wang,Yongzhi Jing,Xinhe Wang,Guo Jin,Xiang Wang
Gd 2 O 3 and Sm 2 O 3 co-doped LZ ceramic ((La 0.5 Gd 0.25 Sm 0.25 ) 2 Zr 2 O 7 /YSZ) are designed and prepared by atmospheric plasma spraying (APS). It is the aim of this study to investigate the similarities and differences between co-doped sample and mono-doped samples, (La 0.5 Gd 0.5 ) 2 Zr 2 O 7 /YSZ and (La 0.5 Sm 0.5 ) 2 Zr 2 O 7 /YSZ on hot corrosion behaviors exposed to Na 2 SO 4 + V 2 O 5 molten salts . Thermodynamic calculations are used to predict the hot corrosion mechanism before experiments. Characterization and hot corrosion behavior are analyzed using X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM). Results indicate that the main hot corrosion products are composed of rare-earth vanadates ((La, Gd)VO 4 , (La, Sm)VO 4 and (La, Gd, Sm)VO 4 , respectively) and ZrO 2 . After 10 h of corrosion, the reaction layer evolves into trilayered structure containing Zr-rich layer, V-rich layer and mixed-layer. The formation mechanism is discussed in detail. The co-doped sample exhibits excellent degradation resistance, which can be attributed to the higher entropy value. The formation of the particular trilayered structure occurs earlier in the co-doped sample, which also provides a role in reducing the degradation rate of ceramics.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Wenqi Yang,Fuxing Ye
The development of YSZ TBCs has been limited by the CMAS corrosion and thermophysical characteristics. The Ytterbium Tantalate (YbTaO 4 ) ceramic was selected in this study to evaluate its potential to replace traditional YSZ. The thermal and mechanical properties of YbTaO 4 show great advantages over YSZ, especially the hardness (191.3 ± 7.6 Hv 0.3 ). The CMAS hot corrosion results indicate that the maximum thickness of the reaction layer at 1350 °C after 24 h is ~16.8 μm, which is much thinner than that of YSZ. Moreover, the porosity of the reaction layer does not increase significantly compared with the YSZ TBCs. The main product after the reaction is the Ca 2 Ta 2 O 7 phase, and there is no anorthite phase after the reaction, mainly because the formation of the Ca 2 Ta 2 O 7 phase consumes a lot of Ca atoms. In addition, the equilibrium contact angle of YbTaO 4 is higher than that of YSZ, which indicates that the YbTaO 4 possesses worse wettability . In actual conditions, low wettability is conducive to the YbTaO 4 TBCs get rid of the liquid CMAS, which can effectively reduce the corrosion effect of CMAS. Furthermore, the corrosion depth and area of YbTaO 4 causing by residual CMAS are also smaller due to the poor wettability. Based on the above results, YbTaO 4 exhibits excellent potential to replace YSZ in preparing TBCs for the next generation aero engines.
研究领域:
材料科学
·
航空工程
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Wiewei Meng,Ling Wang,Yuehua Li,Huizhu Zhou,Zhangxing He,Wei Meng,Lei Dai
CoWO 4 -PdO dual phase composites were successfully prepared by self-demixing of the precursor CoPd x WO 4+x (x = 0, 2%, 5%, 10%) calcined at 800 °C and used as sensing electrodes for mixed-potential type NH 3 sensors based on yttria stabilized-zirconia (YSZ) electrolyte. The materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Field-emission scanning electron microscopy (FESEM), respectively. NH 3 response performance of the sensors to different concentrations of NH 3 (20–300 ppm) was evaluated at 350–500 °C. It was found that the sensors attached with CoWO 4 -PdO sensing electrode are much more sensitive to NH 3 than the CoWO 4 -based sensor. Among them, CoWO 4 -5%PdO based sensor gives the highest sensitivity (−76.8 mV/decade at 400 °C), the response signals (Δ V ) of the sensor vary linearly with the logarithm of the NH 3 concentrations in the range of 50–300 ppm at a given temperature. The sensor also exhibits well reproducibility, stability and long-term stability. Furthermore, compared with CoWO 4 -based sensor, the introduction of PdO in CoWO 4 makes the interference of NO 2 on the sensor significantly reduced from 100% to 50%, which is attributed to the fact that the second phase PdO depresses the adsorption of NO 2 .
研究领域:
材料科学
·
传感技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Tara Larsson,Ting Shuai Li,Min Xu,Ida Fransson,Guangsen Yu,Martin Andersson,Baihai Li,Bengt Sunden
In this study, we co-fabricated the Ni-based nanofibers using an electrospinning technique. The effects of viscosity, applied voltage and distance from needle to the collection plate on the fiber morphology were investigated. The fibers were sintered at temperatures ranging from 350 °C to 1200 °C and the results indicated that the crystallization was completed at 800 °C and the particle size increased with the temperature. The porosity of nanostructure can reach over 50% before reduction of the nickel oxide, which increased firstly with the temperature and then decreased over 800 °C. The nanocrystallization of an anode was helpful to maximize the electrochemical reaction sites for restraining the activation polarization and also to enlarge pores for rapid gas diffusion in fuel cells.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL SPRAY TECHNOLOGY
·
2021
·Vol. 30
·期 4
·873-885
·
IF 2.757
Ye Fuxing,Yang Wenqi,Yan Shuai,Yu Jianxing
CMAS corrosion is one of the significant failure mechanisms for thermal barrier coatings (TBCs). In this work, the corrosion behaviors and wettability of CMAS on M-YTaO 4 at 1350 °C are studied to evaluate the M-YTaO4 ceramics’ potential to replace YSZ. The results show that the contact angles of CMAS on M-YTaO 4 with different time (1 min, 0.5 h, 4 h, 10 h and 24 h) are around 14.3° (14.4°14.4°, 14.4°, 14.3° and 14.2°, respectively), and larger than that on YSZ (8.0°, 1 min), which means the wettability of CMAS on M-YTaO 4 is worse than that on YSZ and which is benefit to improve its corrosion resistance. The thickness of reaction layer is increasing with elapsed time, but the increasing rate is decreased, and the maximum reaction thickness is 31.42 μm at 24 h. There are four main phases after reaction, which are M-YTaO 4 , M’-YTaO 4 , Ca 2 Ta 2 O 7 and Y 2 Si 2 O 7 . For the effects of lattice distortion and thermodynamics reason, M’-YTaO 4 can retain steadily at room temperature. Besides, the chemical reaction process between CMAS and yttrium tantalite is also be discussed.
研究领域:
材料科学
·
陶瓷
·
腐蚀工程
·
热障涂层
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yanting Tian,Xiang Guo,Pingping Wu,Xu Zhang,Zhongquan Nie
Ni-based anode supports with straight open pores were well prepared using self-organization process. The scanning electron microscopy (SEM) results of YSZ ceramic skeletons showed that honeycomb-like structures with highly ordered straight pores were obtained. The regulation of solid loading and CaCl 2 concentration on the morphology of YSZ skeletons were discussed. The YSZ skeleton with solid loading of 10 wt% and CaCl 2 concentration of 1.5 mol L −1 delivered a pore size of 99 μm and a porosity of 46.9%. The solid oxide fuel cell based on Ni-YSZ anode possessed a maximum power density of 253 mW cm −2 and an ohmic resistance of 0.16 Ω cm 2 at 800 °C. The pore diameter and porosity of the ceramic supports could be adjusted to expected values by further optimization of the parameters. The self-organization method will become a feasible and valid operation to produce anode supports with appropriate morphologies.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 7
·077514
·
IF 3.1
Tengteng Zhao,Chaoyu Wang,Lei Dai,Weiwei Meng,Yongguang Liu,Yuehua Li,Ling Wang
NO2 is an important pollutant of automobile engines and industrial fuels, making it important to quantitatively monitor and control. An amperometric-type NO2 gas sensor was fabricated using yttria-stabilized zirconia (YSZ) electrolyte with a bi-layered structure and La0.7Sr0.3MnO3−δ-xNiO (LSMO-xNiO, x = 0–0.75) composite sensing electrode (SE) prepared by impregnation method in combination with self-demixing. The samples were characterized using SEM, XRD, and XPS, and their performance as sensors was tested. LSMO-xNiO composite SE particles were formed by de-mixing in the process of treating the precursor at high temperatures and are uniformly dispersed in the YSZ porous backbone. With the increase of NiO content, the SE particles become significantly large. At 450 °C–600 °C, the response currents at a fixed potential have a linear relationship with the NO2 concentrations at 25–700 ppm. Combining stability and sensitivity, the voltage was fixed to −0.25 V. The introduction of NiO into the LSMO sensing electrode effectively improves the performance of the sensor. The sensor based on LSMO-0.5NiO has the highest sensitivity (0.0405 μA/ppm) at 550 °C. Simultaneously, the sensor exhibits good anti-interference ability for CH4, CO2, O2, and NO, but has obvious cross-sensitivity to H2 and NH3. In addition, the response current of the sensor change with the increase of RH.
研究领域:
材料科学
·
环境监测
·
传感器技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 11
·期 4
·1785-1792
·
IF 14.511
Xin Zhou,Chenghao Yang,Caichen Yang,Jin Li,Bo Chi
The pursuit of highly reactive cathodes promotes the improvement of the electrochemical performance of solid oxide fuel cells (SOFCs), while the side reaction between the cathode and the zirconia electrolyte produces a high-resistance phase impeding interfacial ionic transport. To address this issue, we designed an unsintered composite LaCo0.6Ni0.4O3−δ-Er0.4Bi1.6O3 (LCN-ESB) cathode via self-assembly onto a Y2O3-stabilized ZrO2 (YSZ) electrolyte under in situ current polarization to fabricate a porous cathode layer and a cathode/electrolyte interface with good contact. An area-specific resistance (ASR) of 0.205 Ω cm2 and a peak power density (PPD) of 0.788 W cm−2 can be achieved by a single cell with LCN-ESB cathode at 650 °C using hydrogen as fuel, and the cell runs stably for over 100 h without severe degradation. The oxygen reduction reaction (ORR) activity of the self-assembled LCN-ESB cathode is competitive among intermediate-temperature (IT) SOFC cathodes. This work provides more possibilities for the practical application of YSZ-based SOFCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2013
·
IF 3.535
Chengguo Yin,Yingzhou Guan,Zhe Zhu,Xishuang Liang,Biao Wang,Quan Diao,Han Zhang,Jian Ma,Fengmin Liu,Yanfeng Sun,Jie Zheng,Geyu Lu
In this article, the NO 2 sensing performance of the mixed-potential-type yttria stabilized zirconia (YSZ)-based sensor was improved by modifying the three-phase boundary (TPB). The double-tape casting and the pore-forming method were simultaneously used to obtain the porous YSZ-substrate. Furthermore, a group of tape-casting slurries with different starch concentrations (0 wt%, 5 wt%, 10 wt% and 15 wt%) were applied to form the different contact areas of the three-phase boundary (TPB). The scanning electron microscope (SEM) images showed that YSZ-substrate prepared by using the slurry with 15 wt% starch had the largest contact area. The sensor based on the YSZ-substrate with the largest contact areas and the MnCr 2 O 4 sensing electrode (SE) showed the largest response compared with the other sensors when they were exposed to 10–500 ppm NO 2 at 800 °C. The measured polarization ( I – V ) curves indicated that the present sensors operated under the mixed-potential mechanism. In addition, the sensor showed a good selectivity and repeatability to NO 2 .
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2025
·
IF 6.6
Yuyi Gao,Wenting He,Xueqi Yin,Tiehao Zhang,Zhen Li,Hongbo Guo
The development of high-temperature microwave-absorbing materials that integrate thermal insulation and structural compatibility is critically important yet challenging for practical applications in extreme thermo-electro-mechanical environments. This study proposes a new material design strategy: combining perovskite oxide La 1-x Sr x FeO 3 (LSF) which exhibits high-temperature stability, conductivity, and tunable microwave loss properties, with the classic thermal barrier coating material yttria-stabilized zirconia (YSZ) known for its excellent thermophysical performance. Systematic control of Sr substitution and the LSF/YSZ ratio enables synergistic amplification of electromagnetic attenuation, thermal insulation and coefficient of thermal expansion (CTE). The optimized composite delivers an outstanding reflection loss of −40.9 dB at an ultrathin thickness of 1.1 mm, ascribed to intensified dipole polarization via Sr doping, an adequate fraction of lossy LSF phases, and interfacial polarization at abundant LSF/YSZ boundaries. Additionally, at 1000 °C, it exhibits a CTE of 10.8 × 10 −6 K −1 and a low thermal conductivity of 1.56 W/(m·K), yielding a predicted temperature drop of 220 °C across a 1.1 mm coating. These results provide important design insights and practical foundations for multifunctional microwave-absorbing materials engineered for extreme thermo-electro-mechanical environments. Future research will focus on the stability and performance evolution of composite materials under long-term high-temperature conditions.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）