JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2022
·
IF 4.458
Buyue Zhao,Haiming Huang,Qunjiao Chen
Ceramic fibers have played an important role in the thermal protection field of aerospace vehicles at high-temperature over the past decades. In this work, Y 2 Si 2 O 7 precursor fibers were prepared by electrospinning and characterized. The spinning solution consisted of yttrium nitrate, tetraethyl orthosilicate , and polyvinyl alcohol. The microstructure and elements distribution of fibers was investigated by scanning electron microscopy. The decomposition of organic components and crystallization process of yttrium silicate were explored by thermogravimetry-differential scanning calorimetry. The phase composition of fibers was analyzed by X-ray diffraction. The results showed the fibers were composed of uniform tiny grains after calcined at 1000 °C and the phase of the fibers was α-Y 2 Si 2 O 7 . The size of grains increased with increasing calcination temperature and the intact fibrous structure was maintained. The average diameter of the precursor fibers was 1383 ± 345 nm and decreased to 786 ± 171 nm after calcined at 1300 ℃. Elements distribution was uniform in the fibers, confirming a good homogeneity of the fibers.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Xinning Xu,Zongliang Xiao,Yuhang Wang,Yinuo Yan,Junwei Shen,Yawen Nie,Weixiong You,Di Wu,Lei Han,Fengqin Lai
Ultraviolet-C (UVC) light shows important application prospects in disinfection, disease phototherapy, cancer photodynamic therapy, etc. Here, a novel UVC upconversion phosphor δ -Y 2 Si 2 O 7 :Pr 3+ with excellent optical properties was successfully prepared by the high-temperature solid-state reaction method and the sol-gel method. The XRD results clarified the law of phase transition from the β -/ γ -Y 2 Si 2 O 7 to the δ -Y 2 Si 2 O 7 phase. The diffuse reflection spectra of phosphors prepared by two different methods exhibited two obvious absorption bands related to the 3 H 4 → 3 P 2 and 3 H 4 → 1 D 2 transitions of Pr 3+ ions. And the values of the band gap were estimated by diffuse reflection spectra, which are in good agreement with the value calculated by DFT . Under the excitation of 460 nm laser, two emission peaks corresponding to the 4 f 5 d → 3 H 4 and 4 f 5 d → 3 H 5 transitions of Pr 3+ ions were discovered at ∼247 nm and ∼258 nm in the range of 230–280 nm. Additionally, the phosphor prepared by the sol-gel method has a higher emission intensity than the phosphor prepared by the high-temperature solid-state reaction method. With the help of temperature-dependent emission spectra , the phosphor prepared by two methods demonstrated outstanding thermal stability up to 150 °C, and the luminescent intensity at 150 °C remained 86.8% and 87.9% of that at ambient temperature, respectively. The results mentioned above suggest that the Y 2 Si 2 O 7 :Pr 3+ phosphor may have potential applications in the field of disinfection.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2019
·Vol. 16
·期 6
·2173-2180
·
IF 1.074
Ming-Ye Yang,Bin-Bin Dong,Fei-Hong Wang,Xin Xu,Simeon Agathopoulos
This paper reports on the successful fabrication of α -Si 3 N 4 -nanowire/Y 2 Si 2 O 7 composite membranes with superhydrophobic properties, aiming to achieve a high performance in membrane distillation. The starting powder mixture of 87 wt% γ -Y 2 Si 2 O 7 , 5 wt% Si, 3 wt% LiYO 2 , and 5 wt% ferrocene catalyst was dispersed in a stable suspension, and after being tape-casted, it was sintered at 1300°C for 4 hours in order to obtain the composite membrane. α -Si 3 N 4 nanowires with a diameter of about 50 nm were formed, distributed uniformly on the surface and in the pores of the membrane and their presence greatly favored superhydrophobicity. After surface modification with a robust hydrophobic layer of SiNCO nanoparticles, strongly adhered to the surface of the produced membrane, a water contact angle of 153 o , was measured. Water desalination experiments, using a sweeping gas membrane distillation (SGMD) device, were conducted. High water flux of 11.91 L/m 2 /h was achieved for a 4 wt% NaCl feeding solution at 90°C. Stable water flux and rejection rates were recorded in long-term experiments (>500 hours) using the produced superhydrophobic composite membrane.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Buyue Zhao,Yonghai Wang,Haiming Huang
Fibrous porous ceramics play a vital role in the field of thermal protection systems. In this work, novel lightweight Y 2 Si 2 O 7 fibrous porous ceramics were successfully prepared based on Y 2 Si 2 O 7 fibrous membranes by molding method. The effects of mechanical dispersion speed and heat treatment temperature on the properties of Y 2 Si 2 O 7 fibrous porous ceramics were characterized. The results revealed that benefiting from the appropriate fiber length, the ceramics had a better performance at a mechanical dispersion speed of 4000 revolutions per minute. The density, shrinkage, and compressive strength of the ceramics increased, but the porosity decreased slightly with the increasing heat treatment temperature. The prepared Y 2 Si 2 O 7 fibrous porous ceramics exhibited favorable properties like low density (0.37 g/cm 3 ), high porosity (90.56%), good high-temperature resistance (∼1350 °C), and low thermal conductivity (∼0.12 W m −1 K −1 at 27 °C, ∼0.566 W m −1 K −1 at 1000 °C). These properties indicate that Y 2 Si 2 O 7 fibrous porous ceramics could be a promising candidate as thermal insulation materials in high-temperature environments.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Jun-Min Zhang,Xiao-Wu Chen,Jin-Shan Yang,Xiang-Yu Zhang,Yan-Mei Kan,Jian-Bao Hu,Yu-Dong Xue,Hao Qin,Shao-Ming Dong
The poor wet-oxidation resistance limits the long-life service of SiC f /SiC composites as the hot end components of aero-engines. The stability of SiC f /SiC composites under high-temperature wet oxygen environment can be promoted by more robust SiC matrix. In this work, the effect of Y 2 O 3 on the corrosion behaviors of SiC ceramics in flowing O 2 /H 2 O atmosphere at 1400 ℃ was studied. Duo to the continuous Y 2 Si 2 O 7 layer formed on the surface, SiC-Y 2 O 3 ceramics exhibit much better wet-oxidation resistance than original SiC ceramics. During the oxidation process , Y 2 O 3 dispersed in the ceramics migrates to the surface and reacts with SiO 2 to form β-Y 2 Si 2 O 7 . Subsequently, the β-Y 2 Si 2 O 7 aggregates and grows to form a continuous Y 2 Si 2 O 7 layer, inhibiting the corrosion from oxidizing medium to the inner SiC matrix. This study is expected to provide important ideas for the design and structure regulation of wet-oxidation resistant SiC f /SiC composites.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Buyue Zhao,Jie Huang,Qunjiao Chen,Haiming Huang
Fibrous porous ceramics have been receiving more and more applications in the thermal protection field of vehicles. In this study, we prepared Y 2 Si 2 O 7 fibrous porous ceramics (YFPCs) from Y 2 Si 2 O 7 fibrous membranes via the molding method. The influence of sintering time and binder concentration on the properties of YFPCs was studied, and the oxyacetylene ablation behavior with different heat fluxes was also investigated. The results showed that YFPCs obtained at 2 h sintering time had a stable component composition and constant mechanical strength . YFPCs prepared at 40 wt% binder concentration had the maximum density and compressive strength , 0.47 g/cm 3 and 0.68 MPa, respectively. The as-prepared ceramics exhibited favorable ablation resistance after oxyacetylene ablation for 120 s. The minimum linear ablation rate was 2.02 μm/s when the ablated surface temperature reached 1390 °C. When the surface temperature increased to 1872 °C and 2200 °C, the fibers on the ablated surface began to melt, and the linear ablation rate increased to 9.63 μm/s and 77.63 μm/s, respectively.
研究领域:
材料科学
·
航空航天工程
✓ 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
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Buyue Zhao,Jie Huang,Qing Wang,Haiming Huang,Qunjiao Chen
Ceramic fibrous materials with good thermal insulation properties are in great demand for the thermal protection of vehicles and spacecraft. Here, ultra-fine flexible Y 2 Si 2 O 7 fibrous membranes with excellent thermal insulation performance are fabricated via electrospinning followed by high-temperature heat treatment. Benefiting from the ultra-fine fibrous structure, the Y 2 Si 2 O 7 fibrous membrane was lightweight (∼0.126 g/cm 3 ) and high porosity (97.11%). Meanwhile, the obtained fibrous membranes exhibited low thermal conductivity (∼0.067 W m −1 K −1 at 27 °C, ∼0.299 W m −1 K −1 at 1000 °C), high-temperature resistance (∼1300 °C), excellent flexibility, and good reflectance in the wavelength of 500–2500 nm (average 89.72%). This research demonstrates a novel fabrication process for preparing flexible Y 2 Si 2 O 7 fibrous membranes, but also the flexible Y 2 Si 2 O 7 fibrous membranes are promising thermal insulation materials at high temperature.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2026
·Vol. 19
·期 8
·1628
·
IF 3.7
Wentao Wang,Jiafei Tan,Xueying Zhang,Qi Zhang,Jiachen Liu
HighlightsA Y2O3-SiC synergistic strategy enables in situ formation of Y2Si2O7in corundum–mullite ceramics.Y2Si2O7promotes densification and strengthens grain boundaries during sintering.The optimized sample exhibits improved strength and thermal shock resistance.Y2Si2O7improves crack healing and thermal shock resistance after thermal cycling.The strategy balances strength and thermal shock resistance in multiphase ceramics.Provides guidance for gas turbine combustion chamber insulation materials.The continuous drive for higher efficiency in gas turbines has led to increased combustion temperatures, making the thermal shock resistance of thermal insulation tiles a critical factor limiting performance. Corundum–mullite multiphase ceramics are widely used in such applications; however, their performance is often constrained by an inherent trade-off between mechanical strength and thermal shock resistance. In this work, a synergistic modification strategy based on rare-earth disilicate phases was developed, wherein Y2O3and SiC were incorporated into a corundum–mullite matrix to enable in situ formation and controlled distribution of Y2Si2O7via gel casting. During sintering, Y2Si2O7acts as a transient liquid phase, facilitating densification and grain boundary strengthening; upon thermal shock, it migrates to fill and heal grain boundaries and microcracks, thereby significantly enhancing thermal shock resistance. The optimized sample S5, sintered at 1400 °C, exhibited a bulk density of 2.12 g/cm3and a bending strength of 68.43 MPa. Notably, after 30 thermal shock cycles (air cooling from 1000 °C to RT), its bending strength increased to 79.71 MPa, corresponding to a 16.48% enhancement. This work provides an effective strategy for incorporating rare-earth disilicates into multiphase ceramics and offers valuable guidance for the development of high-performance components for gas turbines.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Yongqiang Chen,Mao Chen,Beibei Tang,Guoqi Liu,Hongxia Li,Hailong Wang,Bingbing Fan
A uniform, dense, and well-bonded mullite/Y 2 Si 2 O 7 /ZrO 2 (MYZ) composite barrier coating was synthesized using a spraying technique followed by a two-step sintering process. The microstructure, phase composition, and thermal shock resistance of the MYZ coating were systematically investigated. The sintering process comprised two stages. In the initial stage (25–1350°C), granular mullite grains transformed into columnar crystals with progressive growth. Concurrently, a eutectic composite of mullite and Y 2 Si 2 O 7 formed and dispersed within the grain boundaries, significantly enhancing the coating's density and adhesion. In the subsequent stage (∼1400°C), ZrO 2 reacted with the eutectic composite to produce yttria-stabilized zirconia (YSZ) in situ. The YSZ phase exhibited excellent interfacial compatibility with the substrate, markedly improving the coating's high-temperature stability. As a result, the coating achieved high hardness and a coefficient of thermal expansion matching that of the SiC substrate. Remarkably, the MYZ coating withstood 20 thermal cycles between 25°C and 1200°C without noticeable interfacial damage.
研究领域:
材料科学
·
高温材料
·
涂层技术
✓ 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）