JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Tao Feng,Wanbo Hou,Mingde Tong,Hejun Li,Hongjiao Lin,Shifeng Wen
SiC nanowires (SiC nws ) modified SiC f /HfC-SiC composites were prepared by precursor infiltration and pyrolysis (PIP) and chemical vapor infiltration (CVI) methods. The microstructure, flexural strengths, impact and impact-ablation tests of the composites with and without SiC nws were investigated. The results showed that after introducing SiC nws , not only the retention rate of HfC ceramic produced by PIP was increased obviously, but also the fracture displacement of the modified composites was reduced due to the enhancement effect of SiC nws at interface between SiC fiber and matrix. After impact and impact-ablation, the strength retention of SiC nws modified composites was 91.6 % and 69.1 % respectively, higher than that of the composites without SiC nws (85.2 % and 54.8 %). As the impact resistance of the modified composites was improved by the pull-out and bridging of SiC nws , the ablation resistance of the impacted composites was enhanced as well.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Bing Liu,Hong Yang,Minxue Deng,Jinbin Xu,Yongbo Xiong,Sihui Wu,Zhanwang Li,Yuncong Xu,Mingyue Wang,Wenfeng Han
The gas-phase catalytic dehydrofluorination of hydrofluorocarbons (HFCs) to hydrofluoroolefins (HFOs) is a critical pathway for HFC resource utilization. Aluminum fluoride (AlF3) derived from Al2O3 fluorination is an efficient catalyst for this process, with its performance strongly dependent on the hydroxyl content and oxygen vacancy concentration of the Al2O3 precursor. In this work, pseudoboehmite (AlOOH) was calcined at 400–600 °C to prepare Al2O3 precursors (AlOOH-T) with tailored hydroxyl contents, followed by fluorination to obtain AlF3 catalysts (AlOOH-T-F). Results showed that increasing the calcination temperature reduced the hydroxyl content and increased the oxygen vacancy concentration in AlOOH-T, leading to significant variations in crystallite size, specific surface area, and surface acid properties of the derived AlF3 catalysts. AlOOH-500-F, derived from AlOOH calcined at 500 °C (optimal hydroxyl and oxygen vacancy levels), exhibited the smallest crystallite size (13.9 nm), the largest specific surface area (21.2 m2·g–1), and abundant medium-strength Lewis acid sites. In the dehydrofluorination of 1,1,1,3,3-pentafluoropropane (HFC-245fa), AlOOH-500-F achieved 75% conversion with no deactivation over 32 h of operation, outperforming catalysts derived from precursors calcined at 400 °C (AlOOH-400-F) and 600 °C (AlOOH-600-F). Further studies on the fluorination degree revealed that excessive fluorination enlarged AlF3 crystallite size and intensified surface acidity, accelerating coke-induced deactivation. Among the tested catalysts, AlOOH-500-5 achieved an HFC-245fa conversion of 80% with no deactivation trend observed over 192 h, demonstrating its excellent stability and potential for industrial applications. This work highlights the critical role of precursor hydroxyl content in tailoring the AlF3 catalyst structure and acidity, providing a practical guideline for designing industrially viable catalysts for HFC conversion.
✓ 已验证
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Xiangli Wen,Gong Peng,Pengpeng Bai,Ningyi Yuan,Luo Yue,Yonggang Meng,Yu Tian,Lvzhou Li,Jianning Ding
With the development of deep-sea exploration technology, the technology of fire-retardant hydraulic fluid (HFC) has played an important role in the power transmission of exploration equipment. However, the mechanism of the influence of seawater content on the tribocorrosion behavior of HFC remains unclear. In this study, the effects of different seawater contents on the tribological and corrosive properties of HFC were systematically investigated. The results showed that when the seawater concentration exceeds 30 wt%, a soft Mg-containing reaction film is formed in the friction contact area owing to seawater corrosion, thus effectively improving the sintering load and wear resistance to some extent. By contrast, with increasing seawater concentration, the lubricity declines, the wear intensifies, and the extreme pressure characteristics decrease significantly. The comparative analysis shows that the composition of the wear and corrosion reaction films significantly differs under high-concentration seawater conditions, which is also a key factor affecting the friction and corrosion behavior of HFC. This study provides a direction for the research and development of wear- and corrosion-resistant materials and coatings on the surface of deep-sea exploration equipment.
研究领域:
材料科学
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腐蚀科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Ximing Duan,Jiale Zheng,Pengfei He,Shujun Hu,Chuan Sun,Zhenfeng Hu,Fengchun Jiang,Zenghua Liu,Xiubing Liang
Enhancing the ablation resistance of ultra-high temperature ceramics based on the solid-liquid theory has become a research hotspot in the field of thermal protection. In this study, HfC-TaC micron composite powders were prepared using spray granulation, and a solid-solution (Hf, Ta)C coating was deposited on the Ta10W substrate through the dual solid-solution effect of radio frequency inductively coupled plasma spheroidization and supersonic atmospheric plasma spraying. The phase composition, microstructure, ablation resistance, and underlying mechanisms of the coating were investigated. The results indicate that after ablation for 200 s at 2200 °C and 2300 °C, the high melting point solid-phase products, HfO 2 and Hf 6 Ta 2 O 17 , serve as structural skeletons, while the liquid-phase Ta 2 O 5 acts as a filler, collectively protecting the Ta10W substrate from oxidation and ablation.
研究领域:
材料科学
·
陶瓷
·
热防护系统
·
等离子喷涂
·
高温材料
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2021
·
IF 7.205
Mingde Tong,Qiangang Fu,Mingyu Liang,Tao Feng,Wanbo Hou,Jia Sun,Xinhao Shi
To optimize the impact-ablation resistance of SiC nws @PyC/HfC coating, PyC-SiC double-layer interface phase was introduced. After impacting test, the crack widths of SiC nws @PyC-SiC/HfC were much lower than that of SiC nws @PyC/HfC coating. The impact-ablation resistance of SiC nws @PyC-SiC/HfC coating was better than that of SiC nws @PyC/HfC coating. The good impact-ablation resistance SiC nws @PyC-SiC/HfC coating attributed to the two-grade pull-out reinforcement effect, self-sealing function of Hf-Si-O glass generated from oxidation of SiC nws @PyC-SiC core-shell structure and the precipitation of HfO 2 grains from Hf-Si-O glass under ablation environment.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Bohan Sun,Cuiyan Li,Haibo Ouyang,Ruinan Gao,Tianzhan Shen,Yanlei Li
The synthesis of hafnium carbide nanowires (HfC NWs ) on carbon fibers was successfully achieved by employing HfCl 4 and furfuryl alcohol as precursor materials, facilitated by Ni-assisted catalytic pyrolysis . In the polymerization and cross-linking processes of furfuryl alcohol, hafnium cations play a crucial role, leading to the atomic-level amalgamation and effectively enhancing the reactivity of the Hf-O-C system. The nucleation of HfC NWs takes place at 1300 °C, followed by growth through a solid-liquid-solid (SLS) mechanism. Carbon fibers were uniformly coated with tens micrometer-long HfC NWs having an approximate diameter of 500 nm. Notably, the tips of these HfC NWs exhibited clean surfaces free of Ni catalyst particles, indicating their root growth model. This novel catalyst-assisted pyrolysis method holds great potential for enabling cost-effective large-scale production of transition metal carbide nanowires.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2020
·
IF 6.479
Tao Feng,Mingde Tong,Shuotian Yao,Hejun Li,Hongjiao Lin,Shifeng Wen,Peipei Wang
The B-modified SiC/HfC-SiC composites were prepared by the combination of precursor infiltration and pyrolysis (PIP) and chemical vapor deposition (CVD) methods. The microstructure, cyclic ablation and bending strength tests of the SiC/HfC-SiC composites with and without B were investigated. The results showed that the B-modified composites had a better cyclic ablation resistance than that of the composites without B. The effective residual thickness of the B-modified composites was also higher than that of the composites without B after cyclic ablation. The residual bending strength of the B-modified composites was slightly lower than that of the composites without B.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 151
·期 7
·2065-2074
·
IF 2.482
Yang Hong,Wu Sen,Chen Zhengfei,Li Lichun,Wang Haili,Liu Bing,Tang Haodong,Li Ying,Chen Aimin,Han Wenfeng
The AlF 3 catalysts with controlled morphology (cubic, hexahedron and octahedron) were synthesized via hydrothermal method using different solvents. The dehydrofluorination of 1,1,1,3,3-pentafluoropropane (HFC-245fa) was used as the model reaction to evaluate the catalytic performance of the AlF 3 catalysts with different morphology. Results showed that surface area, crystal structure, surface acidic properties together with the chemical composition of the AlF 3 catalyst were substantially influenced by the different morphology. XRD results showed that κ-AlF 3 crystalline structure was formed when using ethanol as solvent while β-AlF 3 crystalline structure was formed when using water as solvent. Among the three prepared AlF 3 samples, the AlF 3 -C catalyst with cubic shape demonstrated not only largest surface area but also most amount of medium-strength surface acid sites, resulting in enhanced reaction activity towards the dehydrofluorination reaction. The characteristic high Miller index crystal planes of (402) and (321) exposed on the cubic shaped AlF 3 -C catalyst is believed to be the main reason accounting for the high catalytic performance as there are equal amount of Al and F atoms exposed. Moreover, a reaction mechanism describing dedehydrofluorination of HFC-245fa on AlF 3 catalyst with equal amount of Al and F atoms exposed on certain crystal planes was proposed. Graphic Abstract
研究领域:
催化
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2026
·
IF 14
Zhiyu Yang,Feiyan Cai,Dewei Ni,Bowen Chen,Hongda Wang,Yan Gu,Meng Liu,Yusheng Ding,Shaoming Dong
Ultra-high temperature ceramic matrix composites (UHTCMCs) are essential for thermal protection in extreme aerospace environments. The role of ultra-high temperature ceramic (UHTC) matrix architecture in governing thermal transport and ablation resistance remains insufficiently understood. In this work, high-thermal-conductivity C f /HfC-SiC composites with distinct matrix structures were fabricated via slurry infiltration (SI) and precursor infiltration and pyrolysis (PIP). The PIP route, enabled by molecular-scale precursor infiltration, yields a uniform HfC dispersion within the SiC matrix, establishing a continuous phonon transport network that delivers an axial thermal conductivity as high as 296 W/(m·K). In contrast, the SI route leads to localized HfC enrichment in inter-bundle pores, which, upon ablation, oxidizes into abundant HfO 2 particles that pin the SiO 2 melt, producing a dense and erosion-resistant oxide scale. Consequently, the SI-HfC composite exhibits a linear ablation rate of 0.042 μm/s and a mass ablation rate of 3.61 mg/s, with only a 9.31% degradation in axial thermal conductivity after 100 s ablation at 4.5 MW/m 2 , suffers less thermal conductivity degradation than the PIP-HfC (11.80%). This work elucidates the processing-microstructure-property correlations in UHTCMCs, providing a quantitative basis for route selection in high-thermal-conductivity thermal protection systems.
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Tianzhan Shen,Cuiyan Li,Haibo Ouyang,Jintao Wang,Leer Bao,Sirui Wu,Yanlei Li,Xinge Niu,Li Wang,Qianqian Chen
To enhance the ablation resistance of C/C-HfC-ZrC-SiC composites at temperatures above 2100 °C, a TiC coating was deposited on the surface of the composites by the molten salt method to achieve pore sealing. The influence of this coating on the ablation behavior of the composites was systematically investigated. When exposed to an oxygen-acetylene flame of 2.4 MW/m 2 for 60 s, the mass ablation rate and linear ablation rate of the TiC-coated composite were only 1.12 mg/s and 0.51 μm/s, respectively. Compared with the uncoated samples (1.64 mg/s and 1.05 μm/s), they were reduced by 32% and 51%, respectively. The excellent ablation resistance can be attributed to the preferential oxidation of the TiC coating to form a continuous liquid TiO 2 layer. This liquid layer significantly reduces the surface heat load through evaporation and heat absorption, lowering the surface ablation temperature by approximately 70 °C. Additionally, the liquid TiO 2 penetrates into the interior of the oxide scale through capillary action and reacts with HfO 2 and ZrO 2 in the matrix, promoting in-situ sintering and forming a dense (HfZrTi)O 2 composite oxide scale with a thickness of approximately 100 μm. The synergistic effect of physical sealing and chemical reaction between the coating and the substrate helps to form a robust self-healing oxide scale, providing effective protection under extreme thermal conditions.
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产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2022
·Vol. 19
·期 4
·1956-1969
·
IF 2.328
Wanbo Hou,Wei Qi,Yongqiang Yang,Tao Feng,Mingyu Liang,Mingde Tong,Hejun Li,Hongjiao Lin,Shifeng Wen
The slurry and sol-gel methods were used to introduce SiC nanowires (SiC nws ) into the SiC f /HfC-SiC composites. The microstructures, ablation, and bending behaviors of the SiC nws modified composites prepared by the two methods were compared. The bending strengths of the modified composites obtained by introducing SiC nws by the slurry and sol-gel methods were 224 ± 19 and 154 ± 14 MPa, respectively. The results showed that SiC fibers with chemical corrosion and thermal damage during the sol-gel process decreased the bending strength of the SiC nws -modified SiC f /HfC-SiC composites. Meanwhile, the pyrolytic carbon interface accompanying corrosion damage in the sol-gel process led to the degradation of interface function, which hindered the interface debonding and fiber sliding of the composites during the bending test. After ablation, the bending strengths of the two composites were 188 ± 19 and 50 ± 7 MPa, respectively. The bending strength retention of the modified composites fabricated by the slurry method (83.9%) was higher than that (32.5%) of the composites fabricated by the sol-gel method after ablation. As the composites fabricated by the slurry method exhibited a good ablation resistance under the oxyacetylene flame (∼2350°C).
研究领域:
材料科学
·
航空航天工程
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2022
·Vol. 20
·期 3
·1487-1503
·
IF 2.328
Yao Li,Yu Wang,Jian Cui,Guo-Hua Zhang
High-entropy carbides (HECs) possess superior properties such as favorable corrosion resistance and marvelous hardness and are widely applied in specific extreme environments. Herein, a novel method was proposed for synthesizing HECs powders with raw materials of corresponding oxides and carbon black, which was composed of steps of ball-milling in stainless jar, carbothermic reduction at 1873 K, as well as the following calcium posttreatment at 1273 K to remove residual carbon by generating CaC 2 . Finally, pure HECs powders could be fabricated after acid leaching treatment. Under the current experimental conditions, besides HfC-TaC-ZrC-NbC quaternary system, a homogeneous solid solution could be fabricated by adding Mo or/and Ti, but it could not be achieved for systems with addition of V, W, or Cr, owing to the low lattice constant or different crystal structure of corresponding carbides. In the reduction step, iron resulted from ball milling process acted as the diffusion channel to promote the mutual diffusion of different components. Meanwhile, the calcium treatment temperature had a weak effect on particle size of HEC powders. HfC-TaC-ZrC-NbC-MoC-TiC powders prepared at the calcium posttreatment temperature of 1273 K had an oxygen content of .302% and an average grain size of 252 nm.
研究领域:
材料科学
·
冶金学
·
化学工程
✓ 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）