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
Materials Today Communications
·
2024
·
IF 3.7
Xin Zhang,Jijun Ding,Jiayuan Xu,Haixia Chen,Haiwei Fu
Traditional oil-water separation methods have low separation efficiency and are prone to environmental pollution. The development of low-cost and environmentally friendly novel oil-water separation membranes is of wide interest nowadays. In this work, stearic acid modified Fe 3 O 4 /Y 2 O 3 (Fe 3 O 4 /Y 2 O 3 /SA) composite membranes are prepared on PET and cotton fabric using spraying and impregnation methods. Both Y 2 O 3 and Fe 3 O 4 nanoparticles are compounded on the surface of the substrate and modified using stearic acid impregnation. The results show that Fe 3 O 4 /Y 2 O 3 /SA composite membrane has a water contact angle of 152.5° and exhibits super hydrophobicity/lipophilicity. At the same time, the composite membrane has excellent oil-water separation performance, including high separation efficiency (99.92 %) for a variety of oil-water mixtures, and good stability in 15 cycles of separation tests. The mechanism of oil-water separation is discussed.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yun Liu,Ruixiang Liu,Yuanhang Zheng,Jixue Zhao,Tianyi Sui,Xiaolei Li,Bin Lin
To investigate the mechanism of the influence of the sintering additive ratio on the microstructure evolution of silicon nitride (Si 3 N 4 ) ceramics, Si 3 N 4 ceramics were prepared by gas pressure sintering using different ratios of Y 2 O 3 /MgSiN 2 as additives. Varying the ratio of Y 2 O 3 /MgSiN 2 changed the composition of the liquid phase, thereby affecting the densification process and phase transformation rate of Si 3 N 4 ceramics, and ultimately changing their microstructure. The reduction in the Y 2 O 3 /MgSiN 2 ratio raised the N/O and Si/O ratios in the system, which increased the liquid phase viscosity. The Si 3 N 4 grain distribution varied from "normal to bimodal". In the case of increasing the proportion of MgSiN 2 and prolonging the sintering time, more of the glass phase evaporated, which reduced the content of the low thermal conductivity phase and increased the continuity of Si 3 N 4 /Si 3 N 4 . Therefore, Si 3 N 4 ceramics with 1 wt% Y 2 O 3 and 5 wt% MgSiN 2 exhibited excellent properties after sintering at 1900 °C for 12 h, with thermal conductivity, bending strength , and fracture toughness of 106.7 Wm −1 K −1 , 776 MPa, and 11.66 MPa m 1/2 , respectively.
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 LUMINESCENCE
·
2020
·
IF 3.28
Jiaqiang Liu,Weiling Huang,Zhiguo Xia,Yan Xu
Non-contact thermometry operating at the sub-micrometer level based on self-referencing upconversion (UC) micro-nanomaterial is an attractive pursuit for optical thermometers. Here, a novel accordion-like Y 2 O 3 :Er 3+ nanothermometer with green/red UC luminescence is obtained from the solvent-free grinding and the following temperature-programmed calcination of the Er 3+ -doped Y-containing metal-organic framework (MOF) precursor. Upon 980 nm laser irradiation, the as-prepared Y 2 O 3 :Er 3+ exhibits dual-emitting green and red emissions originating from Er 3+ ions with a two-photon UC process, and the intensities are strongly dependent on temperature. The optical thermometry behaviours of Y 2 O 3 :Er 3+ nanothermometer using the fluorescence intensity ratio (FIR) technique are studied in the temperature range of 298–393 K within the physiological temperature, in which the thermally coupled levels of two green emissions and another pair of coupled levels with red and green emissions are comparatively investigated. A relative large calculated energy gap Δ E (951 cm −1 ) for the thermally couple levels of 2 H 11/2 and 4 S 3/2 and a maximum absolute sensitivity ( S a ) of 0.0027 K −1 at 393 K are determined, respectively. This novel accordion-like Y 2 O 3 :Er 3+ nanothermometer exhibits excellent optical sensing stability and high temperature resolution, demonstrating its great potential as reliable and promising optical thermometers.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhezhe Deng,Yongshuai Xie,Wei Liu,Jianhong Dong,Ying Peng,Ze Zhu,Luyi Zhu,Guanghui Zhang,Xinqiang Wang,Dong Xu
HfO 2 is an important high temperature resistant material, which has a high melting point (2810 °C), good chemical stability and high thermal radiation. Fibrous material has some advantages for heavy refractory matter, such as large aspect ratio, light weight, more energy saving, flexibility and further can be processed into a variety of product forms. In this paper, high strength HfO 2 crystalline nanofibers were prepared through self-synthesis polyacetylcatonahafnium (PAHf) with electrospinning method. Phase variation process was discussed in detail, and the HfO 2 fibers that use Y 2 O 3 as stabilizer with phase stability were prepared finally. The fibers were composed of nanocrystals with good flexibility even folded in half, tensile strength of 1.6 MPa @ 1000 °C and can lifting up 1288 times its own weight, low density around 35 mg/cm 3 . The thermal conductivity was stable around 26 mW / (m·K) @ 1200 °C and the temperature can be cooled from 1200 °C to 396 °C after 180 s through 7 mm fibrous membranes . And after treated at 1200 °C for 5 h, the fibrous membranes also maintain high strength and good flexibility. By this kind of precursor method, high strength oxide fibers can be obtained, which has a wide application prospect in field of high temperature thermal protection.
研究领域:
材料科学
·
高温防护领域
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Fenglong Zhang,Fei Ruan,Jinxiao Bao,Yang Li,Yuwei Ma,Rui Chen
In order to further understand the effect of Y 2 O 3 doping on the electrical conductivity of CaHf 1− x Y x O 3−δ , which was prepared by conventional solid-state reaction. The electrical conductivity of CaHf 1− x Y x O 3−δ was measured by two-terminal AC method in an oxygen-rich atmosphere, hydrogen-rich atmosphere and water vapor-rich atmosphere at the temperature between 973 and 1373 K. The test results show that the conductivity of CaHf 1− x Y x O 3−δ first increases and then decreases with x from 0.08 to 0.20, and its total conductivity and conductivity activation energy are 3.88 × 10 −7 to 5.34 × 10 −5 S/m and 0.76–0.92eV respectively. Combined with the test results of the H / D isotope effect, it is found that protons are the main conductive carriers in the three different atmosphere at temperatures range of 973–1173 K. In addition, in the temperatures range of 1273–1373 K, the positive holes are the main conductive carriers in the oxygen rich atmosphere, and the vacancies participates in the conductive process as the main conductive carriers in the water vapor rich atmosphere. The chemical diffusion coefficients of CaHf 1− x Y x O 3−δ is 3.9 × 10 −6 to 2.4 × 10 −5 cm 2 / s in the temperature range of 973–1373 K. According to the test results of electromotive force, the theoretical electromotive force is consistent with the measured electromotive force. The proton transfer number of CaHf 1− x Y x O 3−δ exceeded 97% in hydrogen atmosphere at temperatures from 973 to 1173 K. In sum, these findings of CaHf 1− x Y x O 3−δ can be used as alternative materials for hydrogen sensor electrolytes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2023
·
IF 3.5
Yuhan Ren,Biao Zhang,Jian Ye,Haoqian Zhang,Zhaoxin Zhong,Yang Wang,Feng Ye
This study successfully prepared a series of novel Y 2 O 3 -SiO 2 composite aerogels using sol-gel methods. The high-temperature calcined SiO 2 -poor aerogels exhibit excellent high-temperature thermal stability in terms of shrinkage, porosity, and BET surface area maintenance. SiO 2 -rich aerogels exhibit more pronounced mesoporous material properties, the BET surface area and pore volume of sample Y2S1 reached 291.04 m 2 /g and 0.50 cm 3 /g, an increase of 278.71% and 297.78% over the pure Y 2 O 3 aerogel, respectively. In addition, compared with untreated mullite fiber, the thermal conductivity of the mullite fiber after impregnation with Y 2 O 3 -SiO 2 composite aerogels decreased by 35.32–45.77% at 300 °C, which is similar to the performance of impregnation with Al 2 O 3 -SiO 2 composite aerogel (38.31%). Moreover, the Y 2 O 3 -SiO 2 composite aerogel with a high BET surface area may have potential applications in the field of luminescent materials such as phosphors due to the intrinsic electronic structure of the rare-earth yttrium and its fantastic optical properties.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jimei Xue,Song Hu,Xiaoping Li,Fei Li,Yuqiang Liu,Hanjun Wei
Polymer derived SiCN ceramics (PDC SiCN) are the key high-temperature matrix materials for structural and stealth integrated ceramic matrix composites (CMC). However, low crystallization degree and homogeneous microstructure of PDC SiCN ceramics results in the lack of effective microwave attenuation mechanism. Hence, a new kind of nonmagnetic metal oxide (Y 2 O 3 ) was in-situ formed in SiCN ceramics to enhance the conductivity loss as well as the polarization loss. Y 2 O 3 modified PDC SiCN ceramics (SiCN-Y 2 O 3 ceramics) were fabricated by pyrolysis polysilazane with different Y(NO 3 ) 3 content at 900 ºC. For the SiCN-Y 2 O 3 ceramic, Y 2 O 3 nanoparticles were dispersed in SiCN ceramic uniformly forming a large number of Y 2 O 3 -SiCN heterogeneous amorphous interface, defects and dipole polarization to enhance its microwave absorbing properties. Due to the multiple polarization loss mechanism, SiCN-Y 2 O 3 ceramic with 10 wt% Y(NO 3 ) 3 content achieved excellent microwave absorption performance at a wide thickness range with the microwave absorbing efficiency more than 90% in the whole X band, and the RC min could reach − 50.2 dB at the thickness of 3.5 mm.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Kun Ge,Cuimiao Zhang,Wentong Sun,Huifang Liu,Yi Jin,Zhenhua Li,Xing-Jie Liang,Guang Jia,Jinchao Zhang
The rare earth hollow spheres with up-conversion luminescence properties have shown potential applications in drug delivery and bioimaging fields. However, there have been few reports for the degradation properties of rare earth oxide drug carriers. Herein, uniform and well-dispersed Y2O3:Yb3+,Er3+ hollow spheres (YOHSs) have been fabricated by a general Pechini sol–gel process with melamine formaldehyde colloidal spheres as template. The novel YOHSs with up-conversion luminescence has good drug loading amount and drug-release efficiency; moreover, it exhibits pH-responsive release patterns. In particular, the YOHSs sample exhibits low cytotoxicity and excellent degradable properties in acid buffer. After the sample was loaded with anticancer drug doxorubicin (DOX), the antitumor result in vitro indicates that YOHS-DOX might be effective in cancer treatment. The animal imaging test also reveals that the YOHSs drug carrier can be used as an outstanding luminescent probe for bioimaging in vivo application prospects. The results suggest that the degradable drug carrier with up-conversion luminescence may enhance the delivery efficiency of drugs and improve the cancer therapy in clinical applications.
研究领域:
生物医学工程
·
纳米医学
·
药剂学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
·
2025
·
IF 1
Mingyuan Zhao,Bowan Tao,Ruipeng Zhao,Xi Chen,Zhenzhe Li,Tian Xie,Qichen Wang,Silong Fang,Ziwen Jin,Yudong Xia
The widespread application of second-generation high-temperature superconducting (2G HTS) tapes has elevated demand for surface smoothing of long-length Hastelloy tapes utilizing simple and low-cost strategies. Amorphous Y 2 O 3 has been used to flatten the long-length Hastelloy tape surfaces via solution deposition planarization (SDP). In this work, the autonomously designed SDP system is applied to flatten the Hastelloy surface while significantly increasing progress rate. As a result, lifting speed up to 75 m/h, while the root mean square (RMS) roughness on Hastelloy tape surfaces was reduced from 28.13 nm to 0.76 nm over 5 × 5 μm² areas. These are superior to those of the state-of-the-art SDP lifting speeds. Additionally, the surface flattening process was elaborated through power spectral density (PSD). The Hastelloy tape surfaces have been confirmed to form a well-biaxially textured MgO buffer layer. The autonomously designed SDP system shed light on an effective strategy for flattening long-length Hastelloy tape surfaces.
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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 6
·4684-4689
·
IF 1.798
Li Zheng,Zhang Le,Zhou Tianyuan,Wang Lixi,Wong Ching Ping,Yang Hao,Zhang Qitu
A novel spray co-precipitation method was adopted to synthesize well dispersed nanocrystalline Y 2 O 3 powders for transparent ceramics. Several analytic techniques such as XRD, SEM, BET and UV–Vis–NIR spectrophotometer were used to determine the properties of coprecipitated powders, and the microstructure and optical properties of as-fabricated ceramics. The influences of the aging time on powders and ceramics were systematically investigated. Precursors were completely reached to yield the Y 2 O 3 phase after being calcined at 1250 °C in air. The calcined Y 2 O 3 powders exhibited an approximately spherical morphology with narrow size distribution and weak agglomeration, with mean particle size of ~140 nm. The co-precipitated nanopowders with an aging time of 12 h exhibited the best sintering activity due to the low agglomeration, and the in-line transmittance of Y 2 O 3 ceramic sintered at 1800 °C for 8 h in vacuum reached to 77.2% at 1064 nm (1 mm thickness).
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 IRON AND STEEL RESEARCH INTERNATIONAL
·
2025
·
IF 3.6
Jin Hu-lin,Ma Yan,Wang Zhou-fu,Liu Hao,Dong Yun-jie,Yi Nian,Wang Xi-tang,Deng Cheng-ji,Xia Zhong-feng,Quan Zheng-huang,Zhang Ling,Tong Guang-da,Fu Wei-dong
MgO–CaO refractories have attracted much attention in the field of clean steel due to the ability of their internal CaO to adsorb elements such as S and P in molten steel. However, there are still some problems such as difficult sintering and insufficient corrosion resistance existing in this system. Different contents of Y 2 O 3 were introduced into MgO–CaO system to prepare MgO–CaO–Y 2 O 3 ternary refractories via traditional and induction sintering methods. The influence of microstructural regulation on the slag-resistant properties of the refractories was investigated. The results show that the introduction of Y 2 O 3 in the MgO–CaO refractories prepared via the two sintering methods leads to the grain boundary reconstruction effect. Under the condition of traditional sintering, when a smaller amount of Y 2 O 3 is introduced into the MgO–CaO refractories, Y 2 O 3 is able to activate the lattice, promote sintering, and improve the densification of the refractories. However, when more Y 2 O 3 is introduced, the excess Y 2 O 3 hinders the sintering densification process. Combined with lamellar intergranular phase generated in the refractories, Y 2 O 3 -based solid solution can react with the slag, increase the slag viscosity and inhibit the penetration of the slag into the refractories. Under the condition of induction sintering, the solid solution of yttrium ions in CaO is increased by using the coupling of electromagnetic and thermal fields. Compared with the MgO–CaO refractories with high Y 2 O 3 content prepared by traditional sintering, the induction sintered refractories have higher densification, which further increases the corrosion resistance. The results provide a new path for developing long-life MgO–CaO based refractories.
研究领域:
材料科学
·
陶瓷
·
冶金
·
耐火材料技术
✓ 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）