CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Zhibo Chen,Xiaotong Zhao,Mingliang Li,Hailong Wang,Qiang Li,Gang Shao,Wen Liu,Hongliang Xu,Hongxia Lu,Rui Zhang,Linan An
Rod-like ZrB 2 crystals were synthesized at 1600 °C in Ar atmosphere by boro/carbothermal reduction using ZrOCl 2 ⋅8H 2 O, B 4 C and carbon powders as raw materials. The optimum molar ratio of raw materials required to form pure ZrB 2 grains was found to be 2: 1.2: 3. With increase in temperature and subsequent heat preservation stage, ZrB 2 powders grew into a rod-like morphology along the c axis. The rod-like ZrB 2 grains obtained at 1600 °C have diameters of 0.5–3 μm and high aspect ratios of >8. Effects of molar ratio of raw materials, heating temperature and holding time on the phase composition and final morphology were investigated. Growth mechanism of rod-like ZrB 2 grains was also analyzed.
研究领域:
材料科学
·
化学工程
·
晶体学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Qiyan Ji,Li Zhang,Xiuling Jiao,Dairong Chen
Alumina aerogels are desirable for lightweight and highly efficient thermal insulation. However, they are typically constrained by brittleness and structural collapse at high temperatures. The manufacture of alumina aerogels with ultralow thermal conductivity and excellent thermal stability at high temperatures beyond 1300 °C is still challenging. Herein, alumina aerogels with superior ultrahigh-temperature-resistant and thermal insulation were successfully prepared by assembling the α-Al2O3 nanosheets with silica sols as the high-temperature binders. Benefiting from the generation of the mullite-covered alumina biphasic structure, the α-Al2O3 nanosheet-based aerogels (ANSAs) exhibit excellent thermal and chemical stabilities even after calcination at as high as 1600 °C. The ANSAs had a low thermal conductivity (0.029 W·m–1·K–1 at room temperature), structural stability with a measured compressive strength of 0.6 MPa, and good thermal shock resistance. Furthermore, the 2D α-alumina@mullite core–shell sheets were also prepared as assembly units to construct aerogels (AMSAs). This core–shell structure can improve temperature resistance through inter-lattice suppression under continuous energy input at high temperatures. The AMSAs have a linear shrinkage of only 2.7% after calcination at 1600 °C for 30 min, further improving the temperature resistance, making them an ideal super-insulating material for applications at extremely high temperatures.
研究领域:
材料科学
·
热力学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaoqing Wang,Ze Zhu,Zhenfeng Guo,Chenyu Mi,Ziting Huang,Yunguang Yin,Luyi Zhu,Guanghui Zhang,Benxue Liu,Yongshuai Xie,Xinqiang Wang
The rapid development of aerospace requires radomes to achieve the effect of thermal insulation and electromagnetic wave transmission. However, traditional interlayer materials in radomes for thermal insulation are eligible to structural collapse and brittle fracture at high temperatures. Here, MgAl 2 O 4 nanofibers (MANFs) are successfully fabricated from a quasi inorganic/block-copolymer chain segment via molecular design. The MANFs have a laminated geometrical form with tiny pore size, high porosity, and frameworks connected by nanoparticles, resulting in both ultralow density and thermal conductivity that endow them with excellent thermal insulation properties. The MANFs possess unprecedented elasticity from –196 to 1600 °C with a recoverable compression strain of up to 80 % and excellent fatigue resistance for long-term use, which exceeds the reported results of existing fibers. Excitingly, the low dielectric constant enhances the electromagnetic wave transparency of MANFs, making them suitable as a signal transmission material in radomes. The tremendous potential of MANFs promotes the development of thermal insulators with wave-transparent properties used in extreme environments.
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
SENSORS AND ACTUATORS A-PHYSICAL
·
2024
·
IF 4.1
Muzhi Li,Xiaofeng Zhao,Yingzheng Liu,Di Peng,Weiwei Cai,Hong Liu
Phosphor thermometry has demonstrated significant potential for nondestructive high-temperature measurements in gas turbines . To expand the measurement range through lifetime-based phosphor thermometry, we developed a novel phosphor, YAG:Dy co-doped with Tb (YAG:Dy,Tb). Three YAG:Dy,Tb samples with varying Tb concentrations were synthesized through the sol–gel method. A fiber-optic-coupled measurement system was established to capture multiple emission peaks of YAG co-doped with Dy 3+ and Tb 3+ at 544 nm, 484 nm, and 458 nm. Efficient energy transfer from Dy 3+ to Tb 3+ resulted in a substantial enhancement of Tb 3+ emission at 544 nm under 355 nm excitation. Owing to the energy transfer, the temperature measurement range under the lifetime method was extended from room temperature to 1600 °C using the combination of Tb 3+ emission at 544 nm and Dy 3+ emission at 458 nm. YAG:Dy,Tb samples with higher concentrations of Tb 3+ exhibited superior temperature measurement performance, mainly owing to their stronger signal-to-noise ratio at >1000 °C. The performances of different emission peaks were also compared according to temperature uncertainty, which generally ranged from 0.1 °C to 2.7 °C across the entire measurement range.
研究领域:
光学传感器
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材料科学
·
高温测温
·
发光光谱学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Sheng Li,Junjie Shi,Yuchao Qiu,Yongyi Zhou,Xiaoyu Gong,Hongjian Tang,Dong Li,Xiao Sai,Jianzhang Li
Phase relationships in the Yb 2 O 3 –Al 2 O 3 –SiO 2 system are critical for the design and corrosion protection of environmental barrier coatings (EBCs), the available data remain scarce and primarily limited to studies from the 1990s. The isothermal phase diagram of the Yb 2 O 3 –Al 2 O 3 –SiO 2 system at 1600°C was conducted using a classical high-temperature equilibrium quenching technique, followed by XRD, SEM, and EPMA phase analysis. The data were reported in the form of liquidus projections and an isothermal phase diagram at 1600°C, with one single-phase region, six two-phase regions, and seven three-phase regions. A comparison of the liquid phase regions at 1550°C and 1600°C revealed a systematic expansion with increasing temperature, consistent with thermodynamic expectations. The experimental results from the present work are essential for the development of a thermodynamic database for rare earth oxides, providing vital guidance for designing next-generation EBCs.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 109
·期 1
·e70416
·
IF 3.8
Junjie Shi,Sheng Li,Chenglin Kang,Futong Li,Min Chen,Shizhuo Yin,Jianzhong Li
This study presents the first systematic experimental determination of phase equilibria in the Er 2 O 3 –Al 2 O 3 –SiO 2 system at 1600°C in air, employing the high-temperature isothermal equilibration method followed by rapid drop-quenching to preserve high-temperature phase assemblages. The mineralogy and chemical compositions of the equilibrated samples were analyzed by x-ray diffraction (XRD), scanning electron microscopy (SEM), and electron probe x-ray microanalysis (EPMA). One single liquid equilibria, five two-phase equilibria (liquid–SiO 2 , liquid–Er 2 Si 2 O 7 , liquid–Er 3 Al 5 O 12 , liquid–Al 2 O 3 , and liquid–mullite) and seven three-phase equilibria (liquid–SiO 2 –Er 2 Si 2 O 7 , liquid–Er 2 Si 2 O 7 –Er 2 SiO 5 , liquid–Er 2 SiO 5 –Er 3 Al 5 O 12 , liquid–Er 3 Al 5 O 12 –Al 2 O 3 , liquid–Al 2 O 3 –mullite, Er 2 O 3 –Er 2 SiO 5 –Er 4 Al 2 O 9 , Er 3 Al 5 O 12 –Er 2 SiO 5 –Er 4 Al 2 O 9 ) were observed in the equilibrium ternary system. The 1600°C isothermal section of the Er 2 O 3 –Al 2 O 3 –SiO 2 phase diagram in air ( p O 2 = 0.21 atm) was constructed based on the present experimentally determined equilibrium phase compositions. The liquid area and the primary fields of SiO 2 , Er 2 Si 2 O 7 , Er 3 Al 5 O 12 , Al 2 O 3 , and mullite were constructed. The comparison of the present experimental results deviate significantly from the modelling by FactSage (version 8.3) using its “ FactPS ” and “ FToxid ” databases, suggesting that FactSage underestimated the stability of the liquid phase under the present experimental conductions.
研究领域:
材料科学
·
陶瓷
·
相图
·
高温材料
·
腐蚀科学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2019
·Vol. 17
·期 3
·874-885
·
IF 1.074
Zilong Lu,Bixiong Bie,Aimin Pang,Wei Li,Jianling Yue,Xiaozhong Huang,Haitang Yang
SiC f /SiC composites that possess PyC or BN interface layers were fabricated and then oxidized in moist air at 1000, 1200, 1400, and 1600°C. High-resolution CT was used for capturing 3D images and quantifying the SiC phase, mesophase, and voids. The oxidation behavior and microstructural evolution of SiC f /SiC with PyC or BN interface are discussed in this study. The microstructure of the SiC f /SiC with a PyC layer was seriously damaged in moist air at high temperature, whereas the BN interface layer enhanced the oxidation resistance of the SiC f /SiC. These results are also confirmed by using XRD, oxidation mass gain, tensile testing, and SEM measurements. The results of the oxidation behavior and microstructural evolution for SiC f /SiC oxidized in dry air are also compared with the results of this study. Comparing the SiC f /SiC with a PyC interface layer, the composite with a BN interface layer oxidized in moist air exhibits a high void growth rate and a low SiO 2 grain growth rate from 1000 to 1600°C. This work will provide guidance for predicting the service life of SiC f /SiC for multiscale damage rate models of materials at a local scale and will also provide guidance on the life service design of SiC f /SiC materials.
研究领域:
材料科学
·
陶瓷基复合材料
·
高温氧化
·
微观结构表征
·
无损检测
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 5
·e70838
·
IF 4.2
Sheng Li,Rui Zhang,Min Chen,Junjie Shi,Jing Xu,Yueyao Liu,Xiao Zhang,Zhuoying Lian,Yuyan Wu,Yandong Li,Jianzhong Li
Understanding the phase equilibria of the Yb 2 O 3 -MgO-SiO 2 system is crucial to reveal the coating-medium interaction mechanism and guide composition design. In the present work, the isothermal section of the Yb 2 O 3 -MgO-SiO 2 system at 1600°C in air was systematically constructed using high-temperature equilibrium quenching experiment combined with XRD, SEM, and EPMA analyses. Ten phase regions were identified, including one liquid-phase region, four two-phase regions, and five three-phase regions. Comparative analysis with the binary subsystems highlights the restricted solubility of Yb 2 O 3 in MgO (1.61 wt%) and the associated asymmetry, which are rationalized by crystallographic constraints and defect energetics. This study fills a critical knowledge gap and provides essential phase equilibria data for designing advanced Yb-silicate coatings with enhanced CMAS and corrosion resistance, as well as for developing MgO-based refractory materials.
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 11
·6953-6964
·
IF 4.186
Yuchao Qiu,Junjie Shi,Bin Yu,Changle Hou,Jingjing Dong,Song Li,Yumo Zhai,Jianzhong Li,Changsheng Liu
The recycling of titanium from titania-bearing slag is an important part of the circular economy; however, the yield of titania is restricted due to the lack of fundamental thermodynamic data. In the present work, the equilibrium phase relations of MgO–Al 2 O 3 –TiO 2 system in air at 1600°C have been determined using a high-temperature equilibration-quenching technique followed by X-ray photoelectron spectroscopy, scanning electron microscopy-energy-dispersive X-ray spectrometry, and X-ray diffraction. Ti 4+ was confirmed as the stable valence of titanium, and the rutile and spinel solid solution phases were detected to be coexisting with pseudobrookite solid solution phase, respectively. The formation principles of pseudobrookite and spinel solid solutions were confirmed in view of the corresponding crystal structure and the composition substitution relationship of the oxides at 1600°C. However, great discrepancies were found from the comparison of the present experimental results with the thermodynamic calculations and the literature results, and the present equilibrium phase relations are therefore significant for updating the present titania related thermodynamic database for a superior prediction of the thermodynamic behaviors of relevant process.
研究领域:
材料科学
·
冶金工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Mengchuan Li,You Zhou,Tongsheng Zhang,Rensheng Li
The sluggish advancement in technology for the recovery of rare earth elements from secondary resources can be largely attributed to an inadequate understanding of the thermodynamic properties of cerium oxide-based slag systems. This study systematically investigates the phase equilibrium of the Ce 2 O 3 -CaO-SiO 2 -5 wt% MgO quaternary system at 1500 °C and 1600 °C. High-temperature equilibrium experiments followed by rapid quenching were conducted, and phase assemblages were characterized by XRD, SEM and EPMA. For the first time, the results accurately determined the isothermal liquidus lines for the first time and identified the stable regions of key phases such as SiO 2 , Ce 2 Si 2 O 7 , CaO·2Ce 2 O 3 ·3SiO 2 , CaO·Ce 2 O 3 ·2SiO 2 , the Ce-doped dicalcium silicate (i.e., (Ca, Ce) 2 SiO 4 ), and the monticellite (i.e., CaMgSiO 4 ), as well as their coexistence relationships. Furthermore, the isothermal sections at 1500 °C and 1600 °C were constructed based on experimental data and fundamental thermodynamic principles. This study not only fills a critical gap in the thermodynamic database for rare-earth slag systems but also provides a theoretical basis for optimizing slag design and enhancing cerium recovery from waste slags.
研究领域:
冶金物理化学
·
无机非金属材料
·
高温过程热力学
·
资源回收
·
稀土冶金
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Dongfang Xu,Lei Feng,Qiang Song,Qiangang Fu
Reconciling ultralight compliance with ultrahigh-temperature oxidation resistance under one-sided heating remains a key challenge for ceramic aerogels in extreme thermal protection systems (TPS). Here we report a spatially programmed rigid–flexible aerogel, locally impregnated ZrO 2 /SiO 2 /C–Si 3 N 4 nanoribbon aerogel (L-ZSC-SNRA), fabricated by bidirectional freeze-casting and stepwise localized impregnation of polycarbosilane (PCS) and Zr-containing PCS precursors followed by pyrolysis. The ≈30 mg cm −3 monolith is functionally graded, decoupling hot-face protection from cold-face compliance by integrating a multiphase ZrO 2 /SiO 2 /C hot-face armor with a porous elastic Si 3 N 4 skeleton. Consequently, L-ZSC-SNRA achieves 98% recoverability at 60% strain with stable 1000-cycle compression and retains ≈83% recoverability after single-sided static oxidation in air at 1600°C. It exhibits low thermal conductivity from 25°C–1000°C (38.6–105.2 mW m −1 K −1 ) and strong flame shielding under a ≈1500°C torch, limiting the cold-side temperature to 218.1°C for a 10-mm slab after 10 min. Notably, the thermal-conductivity increase at 1000°C after the 1600°C static oxidation is only 6.8%, evidencing robust high-temperature thermal-transport stability. This work overcomes the key trade-off between ultralight compliance and ultrahigh-temperature oxidation durability, demonstrating a scalable locally graded coating–architecture strategy for oxidizing extremes relevant to TPS.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）