CERAMICS INTERNATIONAL
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2019
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IF 3.45
Wenqi Yang,Fuxing Ye,Shuai Yan,Lei Guo
The corrosion of YSZ TBCs attacked by calcium–magnesium–aluminosilicate (CMAS) is a serious problem. Yttrium tantalite (YTaO 4 ), a new kind of potential thermal barrier ceramic material, was expected to replace the YSZ to manufacture the TBCs because of its great thermophysical characteristics. In this study, porous YTaO 4 ceramic pellets, instead of actual TBCs, were used to investigate the CMAS corrosion resistance at 1250 °C. Results indicated that CMAS couldn't cover the whole surface of YTaO 4 pellets homogeneously because of low wettability between liquid CMAS and YTaO 4 , in addition, there was almost no reaction layer after 4 h reaction. The XRD results showed that M-YTaO 4 , M′-YTaO 4 , Ca 2 Ta 2 O 7 and Y 2 Si 2 O 7 were the main four phases after reaction and there was no phase containing the elements of Mg and Al. Compared with YSZ TBCs, this new kind of potential thermal barrier ceramic material showed well resistance to CMAS corrosion.
研究领域:
材料科学
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陶瓷工程
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DOI
高影响因子
JOURNAL OF THERMAL SPRAY TECHNOLOGY
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2021
·Vol. 30
·期 4
·873-885
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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
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陶瓷
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腐蚀工程
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热障涂层
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DOI
高影响因子
Chemistry-An Asian Journal
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2023
·Vol. 18
·期 9
·e202300145
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IF 4.1
Hai Zou,Yunfeng Bao,Shiwen Du,Xueshang Xin,Yu Qi,Guosheng Shao,Fuxiang Zhang
Graphical A visible-light-responsive photocatalyst based on nitrogen-doped bulk oxide YTaO 4− x N y was synthesized and used as an H 2 evolution photocatalyst for Z-scheme overall water splitting coupling with the PtO x /WO 3 as the O 2 evolution photocatalyst and the I − /IO 3− as the shuttle ions. Nitrogen doping into oxide has been proved to be an effective strategy to extend visible-light utilization of oxides with layered or channeled structure, but it is shortage for the bulk oxides free of layered or channeled structure. Here, we report a novel nitrogen-doped bulk oxide (denoted as YTaO 4− x N y ) with good visible light response. As benefited from the strong hybridization of N 2 p and O 2 p electronic state according to the density functional theory (DFT) calculations, the band gap (3.6 eV) of YTaO 4 precursor was sharply narrowed to 2.4 eV on YTaO 4− x N y due to the obvious uplift of the valence band maximum (VBM). After decorated with the platinum cocatalyst, the Pt/YTaO 4− x N y was used as the H 2 -evolving photocatalyst for assembly of Z-scheme overall water splitting system by coupling with the PtO x /WO 3 as the oxygen evolution photocatalyst and using the I − /IO 3− as the shuttle ions. This work enriches the material database of nitrogen-doped oxide with wide visible light absorption and shows its promising application in solar-to-chemical conversion.
研究领域:
材料科学
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光催化
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可再生能源
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2026
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IF 6
Guangda Ni,Zhaoyang Sun,Qiang Tu,Jingkang Feng,Yongmei Gao,Donglin He,Bing Wu,Qing Zhao,Aimin Chang,Zhilong Fu
Here, systematic investigation was conducted on the negative temperature coefficient (NTC) behaviors of YTaO 4 -based ceramics (YTaO 4 , Y 1/2 Ce 1/2 TaO 4 and Y 1/3 Ce 1/3 Pr 1/3 TaO 4 ) characterized by a metastable monoclinic M-phase (I2/a) and prepared via conventional sintering. For YTaO 4 -based ceramics, the addition of 1% Al 2 O 3 sintering aid not only promotes densification and improves sintering performance, but the formed intergranular phase also effectively inhibits secondary recrystallization of the ceramic. Meanwhile, the electrical conduction mechanism was explored. The NTC behavior of the Y 1/2 Ce 1/2 TaO 4 and Y 1/3 Ce 1/3 Pr 1/3 TaO 4 ceramics is well described by the small polaron model at low temperatures, while it becomes dominated by oxygen ion migration at high temperatures. The results elucidate the effect of O V -induced formation of lattice distortions on the two charge conduction mechanisms. Temperature-dependent resistivity patterns manifest two charge conduction mechanisms. ( E a = 0.20-0.32 eV and 0.51-0.60 eV), which are intrinsically linked to the microstructure formation of polycrystalline materials. These findings offer novel insights into the regulation of NTC thermistors and the optimization of charge stability.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Manyu Zhang,Binbin Wu,Mingzhu Peng,Jinwen Yang,Yukun Ding,Guangchi Wang,Jun Wang,Qingwei Jiang,Peng Wu,Xiaoyu Chong,Jing Feng
An ideal thermal barrier coating (TBC) material requires high fracture toughness to suppress crack initiation and propagation and excellent wear resistance to withstand abrasion under the conditions of ultra-high temperature, high pressure, and severe gas erosion. Although rare-earth tantalates are promising materials for TBCs, their low fracture toughness and high wear rates limit their application under extreme operating conditions. Here, SiC whiskers (SiC w ) are introduced into YTaO 4 to optimize both fracture toughness and wear resistance through crack deflection, whisker bridging, and whisker pull-out mechanisms. The results demonstrate that SiC w , as a second phase, can increase the fracture toughness of YTaO 4 by 146% and reduce the wear rate by 69.16%. Compared to traditional TBC materials, SiC w -reinforced YTaO 4 composites exhibit higher fracture toughness and lower wear rates, significantly extending the service life of YTaO 4 TBCs. Download: Download high-res image (456KB) Download: Download full-size image
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DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
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2025
·Vol. 32
·期 6
·1441-1450
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IF 7.2
Chen Xunlei,Chen Lin,Tian Jiang,Xu Cheng,Liao Jiaxin,Li Tianyu,Wang Jiankun,Feng Jing
Thermal and mechanical properties of yttrium tantalate (YTaO 4 ), a top coat ceramic of thermal barrier coatings (TBCs) for aeroengines, are enhanced by synthesizing Y 1− x Ta 1− x M 2 x O 4 (M = Ti, Zr, Hf; x = 0.06, 0.12, 0.18, 0.24) medium-entropy ceramics (MECs) using a two-step sintering method. In addition, the thermal conductivity, thermal expansion coefficients (TECs), and fracture toughness of MECs were investigated. An X-ray diffraction study revealed that the Y 1− x Ta 1− x M 2 x O 4 MECs were monoclinic, and the Ti, Zr, and Hf doping elements replaced Y and Ta. The variations in atomic weights and ionic radii led to disturbed atomic arrangements and severe lattice distortions, resulting in improving the phonon scattering and reduced thermal conductivity, with Y 1− x Ta 1− x M 2 x O 4 MECs ( x = 0.24) exhibiting the lowest thermal conductivity of 1.23 W·m −1 ·K −1 at 900°C. The introduction of MO 2 increased the configurational entropy and weakened the ionic bonding energy, obtaining high TECs (10.4 × 10 −6 K −1 at 1400°C). The reduction in the monoclinic angle β lowered the ferroelastic domain inversion energy barrier. Moreover, microcracks and crack extension toughening endowed Y 1− x Ta 1− x M 2 x O 4 MECs ( x = 0.24) with the highest fracture toughness of (4.1 ± 0.5) MPa·m 1/2 . The simultaneous improvement of the thermal and mechanical properties of the MO 2 (M = Ti, Zr, Hf) co-doped YTaO 4 MECs can be extended to other materials.
研究领域:
材料科学
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机械工程
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DOI
高影响因子
Metals
·
2025
·Vol. 15
·期 3
·307
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IF 2.5
Ziyang Ruan,Zifan Zhao,Jing Feng
Rare-earth tantalates (RETaO4) are considered as a type of emerging thermal barrier coating materials applied to the hot components of gas turbines and aerospace engines due to their excellent thermal stability, high-temperature fracture toughness, corrosion resistance and extremely low thermal conductivity. However, the relatively low hardness and thermal expansion coefficients may limit their service lifetime in a harsh engine environment. To address the current limitation of rare-earth tantalates and further optimize the mechanical and thermal properties, the defective fluorite-structured Y₂Zr₂O₇ (YZ) was introduced as a second phase into the YTaO4(YT) matrix to form YT1−x–YZx(x = 0, 0.25, 0.5, 0.75, 1) composite ceramics in this work. The mechanical and thermal properties of YT1−x–YZxcomposite ceramics are significantly improved compared to pure-phase YTaO4ceramics. The Vickers hardness of YT1−x–YZx(x = 0.25, 0.5, 0.75) composite ceramics is 9.1~11.3 GPa, which are 2~2.5 times higher than that of YTaO4(4.5 GPa). Among them, YT0.75–YZ0.25exhibits a maximum fracture toughness (3.7 ± 0.5 MPa·m1/2), achieving a 23% improvement compared to YTaO4(3.0 ± 0.23 MPa·m1/2) and a 118% improvement compared to Y2Zr2O7(1.73 ± 0.28 MPa·m1/2). The enhancement is attributed to the combined effect of the intrinsic strengthening of the second phase, as well as the residual stress and grain refinement caused by the introduction of a second phase. Additionally, the thermal expansion coefficients of YT1−x–YZxcomposite ceramics at 1673 K range from 10.3 × 10⁻⁶ K⁻1to 11.0 × 10⁻⁶ K⁻1, which is also higher than that of YTaO4(10.0 × 10−6K−1). Consequently, the superior mechanical and thermal properties indicate that YT–YZ composite ceramics possess promising application prospects for thermal barrier coatings.
研究领域:
材料科学
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工程学
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DOI
高影响因子
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