JOURNAL OF THERMAL SPRAY TECHNOLOGY
·
2023
·
IF 3.1
Yan Chao,Cui Xiufang,Jing Yongzhi,Chen Zhuo,Wang Rui,Fang Yongchao,Jin Guo,Liu Erbao
In this work, rare-earth elements Eu and Y were added to La 2 Zr 2 O 7 (LZ) as doping elements, and the ceramic coating of (La 0.5 Eu 0.25 Y 0.25 ) 2 Zr 2 O 7 (LEYZ) was prepared. The evolution of the sintering resistance, thermal shock resistance, and thermal insulation properties of the multi-element rare-earth co-doped modified coatings under long-term and high-temperature conditions was studied. The results showed that the sintering resistance of the doped coating was significantly improved, and the coating still does not fall off after 200 h at 1100 °C. The thermal shock life of the coating at 1000 °C is increased by 47% compared with that of the undoped modified LZ coating. The length of the vertical cracks in LEYZ ceramic layer is obviously shorter than that in LZ coating, which will be more beneficial to preventing the coating from peeling off. Compared with LZ coating, the insulation temperature of the LEYZ ceramic coating is increased by 24, 26 and 34% in the range of 900 ~ 1100 °C, respectively. The coating has the best thermal insulation effect, which is consistent with theoretical calculation results. The results demonstrate that the modified lanthanum zirconate coatings doped with Europium and Yttrium has great potential in high-temperature performance.
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
Polymer Chemistry
·
2024
·Vol. 15
·期 21
·2157-2166
·
IF 4.1
Muyao Gao,Qian Wu,Tianhao Li,Li Liu,Bing Li,Yujie Song,Ming Liu
The superior high-temperature resistance of phthalonitrile resins shows great application potential in extreme environments. However, the high rigidity and strong intermolecular force lead to a high melting point and harsh processing conditions. To improve the processability of phthalonitrile resins, Si–O–Si chain segments with long bond lengths and large bond angles were introduced, and a liquid phthalonitrile monomer was successfully prepared. The flexible segment effectively improved the processing performance of the monomer, which was characterized by a low melting point (−10.8 °C), low viscosity (∼4.3 Pa s at 30 °C), and good solubility in common solvents. The cured resin showed excellent thermal properties, credited to the high bond energy from Si–O bonds and the aromatic heterocyclic structures formed during curing. Moreover, the resin also demonstrated good flame retardancy without flame retardant additives, and low heat release capacity (32.7 J g−1 K−1), and passed the V-0 rate of the UL 94 test. This high-performance resin, integrating easy processing, high-temperature resistance, and flame retardancy, makes phthalonitrile a suitable resin to serve in harsh environments.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Hehai Zhang,Xinliang Li,Yuehai Shao,Kai Wang,Jianghao Peng,Han Fang
With the continuous improvement of environmental protection requirements in the drilling fluid industry, the research of environmentally friendly additives has been widely discussed. Modified starch is a typical natural material and has been usually used as an environmentally friendly fluid loss additive. However, their high-temperature resistance is poor and limits their application. In this study, a composite fluid loss additive (STA) was prepared by reverse emulsion polymerization using corn starch and alkyl glycoside as raw materials and epichlorohydrin as the cross-linking agent. The molecular structure, thermal stability, and microstructure of STA were characterized, and its filtration properties were systematically evaluated. Results demonstrated that the thermal decomposition temperature of STA was 324 °C and significantly higher than that of corn starch. STA was irregularly spherical in an aqueous solution, and its surface presented a porous structure. Moreover, STA was easily biodegradable with a BOD/CODcr ratio of 19.2%. Filtration tests showed that the temperature resistance of STA could reach 170 °C, and 3% of STA reduced the fluid loss volume of 4% bentonite suspension by 62.71%. In comparison, the filtration performance of STA was better than those of corn starch and commonly used sodium carboxymethyl starch. On one hand, STA had a cross-linked structure and a long paraffin chain, providing strong thermal stability at high temperatures. Besides, the porous structure of STA was beneficial for plugging through shape change and adsorbing water in drilling fluids. On the other hand, STA would interact with clay, increase the viscosity of the bentonite suspension to a certain extent, and improve the colloidal stability. Finally, STA plugged the pores and formed a thin, compact, and relatively hydrophobic filter cake, reducing fluid loss, even at high temperatures. STA can be used as a fluid loss additive with efficient high-temperature resistance and environmental friendliness and also provides new guidance for designing high-performance water-based drilling fluids.
研究领域:
材料科学
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石油工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Haoxin Lin,Lin Tian,Xiaoyan Liu,Guocheng Wang,Chongchong Xie,Guohua Li,Chao Tian
In order to improve the comprehensive utilization rate of magnesite flotation tailings and solve its accumulation pollution problem. In this work, Mg 2 SiO 4 -MgO refractories were prepared by solid-phase method using magnesite flotation tailings as raw material and Pr 6 O 11 as additive. The adjustment mechanism of Pr 6 O 11 on the intergranular binding phase of Mg 2 SiO 4 -MgO refractories was investigated and the optimal addition amount of Pr 6 O 11 was determined through thermodynamic calculations, DSC test, phase composition test, microstructure observations and physical property tests. The results show that when Pr 6 O 11 is not added, the intergranular binding phase of Mg 2 SiO 4 -MgO refractories is CaO·MgO·SiO 2 . After Pr 6 O 11 is added, Pr 6 O 11 takes advantage of its high reactivity to extract SiO 2 and CaO from the MgO-SiO 2 -CaO system, which is supposed to synthesize CaO·MgO·SiO 2 , and reacts to produce Ca 2 Pr 8 (SiO 4 ) 6 O 2 , which consumes the reactants for synthesizing CaO·MgO·SiO 2 , thus inhibiting the production of CaO·MgO·SiO 2 . Thereby adjust the refractories intergranular binding phase from low melting point CaO·MgO·SiO 2 (melting point:1498°C) to high melting point Ca 2 Pr 8 (SiO 4 ) 6 O 2 (melting point:1780°C), which resulted in the improvement of the refractories's high temperature resistance and thermal shock resistance. At the same time, Pr 6 O 11 can form solid solution with Mg 2 SiO 4 and MgO to promote the sintering densification of the refractories, and the overall performance of the refractories is optimal when the addition amount of Pr 6 O 11 is 2wt%.
研究领域:
材料科学
·
无机非金属材料
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Zhijun Liu,Wenjie Diao,Guoming Yuan,Hui Yang,Yanghan Tao,Kun Wu,Jun Shi,Li Yang
Acrylate pressure-sensitive adhesives (PSA) have been widely used in daily life and industrial manufacturing. However, its inherent hydrophilicity and low cohesive strength severely limit its application under harsh conditions such as underwater and high temperature. In this study, the molecular structure of PSA was carefully designed to take advantage of the structurally advantageous strategy of N -acryloylphenylalanine (ACP), and PSA was prepared by copolymerization of ACP with commonly used acrylic monomers. The rigid benzene ring of ACP facilitates the breaking of the hydration layer on the surface of the PSA-substrate underwater, and the carboxylic acid facilitates the establishment of an effective physical interaction between PSA and substrate. As a result, compared with the conventional acrylic ABP 0.1 -AA 10 , the ABP 0.1 -ACP 10 exhibited excellent adhesion properties underwater and at high temperature, with an underwater peel strength of 3.1 N and a high-temperature peel strength of 8.7 N, which were increased by 181.1 % and 234.6 %, respectively. Notably, the UV-induced cross-linking and rigid benzene ring restricted the movement of molecular chains, giving ABP 0.1 -ACP 10 good heat resistance (T HRI : 178.3 °C) and water resistance. Our work may provide a promising solution for designing PSA with good water resistance, heat resistance and high cohesion.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Deng Hu,Hang Luo,Yuan Liu,Fan Wang,Bo Peng,Xiaona Li,Huan Wang,Guanghu He,Dou Zhang
Dielectric capacitors are indispensable energy storage components in both civilian applications and industrial processes. Under elevated temperatures and intense electric fields, polymer dielectrics usually suffer from an inevitably increase in conductivity, leading to a significant reduction in breakdown strength, energy density and efficiency. This investigation aims to design an all-organic dielectric with enhanced high-temperature capacitive performance by introducing a small molecule P-xylene F (PF) into polyetherimide (PEI). Two mechanisms including the incorporation of deep trap energy levels via wide bandgap fillers and the electrostatic interactions by hydrogen bonding between the fillers and the polymer matrix are proposed to support the enhancement. The hydrogen bonding between PF and polyamic acid (PAA)chains induces the formation of physical cross-linking between PF and the negatively charged benzene rings in PEI after imidization. This influences benzene ring stacking within the polymer chains and enhances the film’s mechanical strength. Additionally, PF’s wider bandgap compared to PEI introduces deep trap energy levels, hindering carrier transport and reducing conductive losses at high temperatures. As results, the dielectric achieves an energy density (U d ) of 4.47 J/cm 3 with an efficiency (η) above 90 % at 200 °C. Its excellent stability is also demonstrated with over 210,000 charge–discharge cycles at 200 °C. This study promotes the development of high-performance dielectrics at high temperature.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 41
·21912-21922
·
IF 14.511
Wei-Chen Zheng,Chen-Guang Shi,Peng Dai,Zheng Huang,Jin-Xia Lin,Hui Chen,Miao-Lan Sun,Chong-Heng Shen,Chen-Xu Luo,Qiong Wang,Xin Feng,Yi-Min Wei,Ling Huang,Shi-Gang Sun
Lithium metal batteries (LMBs) with Ni-rich cathode materials providing ultra-high energy density (∼500 W h kg−1) are expected to be the next generation of batteries. However, high-voltage LMBs exhibit inferior electrochemical performance at elevated temperatures, due to severe dendrite growth in lithium metal anodes and the structural degradation of Ni-rich cathodes, which should be paid attention to in terms of their practical application. Herein, by introducing 1,3-propane sultone (PS) into the carbonate electrolytes, satisfying cycling stability of Li‖LiNi0.8Co0.1Mn0.1O2 (NCM811) batteries at a high cut-off voltage of 4.45 V and an elevated temperature of 45 °C was achieved, which also shows higher ionic conductivity, wettability and thermodynamic stability. This approach enables uniform lithium plating/stripping at elevated temperatures, because of the construction of a LiF/Li2SO3-rich interphase layer. Besides, PS inhibits drastic structural change and interfacial side reactions on NCM811. It is also noteworthy that Li‖NCM811 full cells delivered decent performance at high-load cathodes, ultra-thin lithium anodes and lean electrolytes cycling at 4.45 V and 45 °C. This strategy provides a feasible solution for boosting high energy density LMBs under extreme conditions.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Zhe Zhang,Wei Dong,Haoming Zou,Shuai Zhao,Chenze Chai,Yansong Shi,Xijuan Lv,Qinghai Shu
Heat-resistant electromagnetic-interference (EMI) shielding materials have received considerable attention for application in extreme environments. In this study, the surface of silicon carbide (SiC) particles were modified using a silane coupling agent. Polyaniline-coated SiC (mSiC@PANI) composites with core–shell structures were subsequently prepared through situ polymerization. Polyimide (PI), a special engineering plastic with excellent thermal stability, was synthesized by prepolymerization, and the resulting ternary PI/mSiC@PANI films exhibited high EMI shielding performance in the X and Ku bands. The EMI shielding efficiency of the composite films with a thickness of 2 mm reaches 35 dB owing to the high conductivity of PANI and interface effect between PANI and SiC, promoting the absorption and attenuation of EM waves. The introduction of high-temperature-resistant SiC filler significantly improves the high-temperature resistance of the PI-based composite films with the thermal decomposition temperature of 600°C, demonstrating their application at temperatures below 300°C for a long period and suitability for EMI shielding in complex environments.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Shuxuan Li,Jie Qu,Jian Wang,Xinhui Li,Xingyao Dai,Yanda Jiang,Zhonghui Shen,Bao-Wen Li,Xin Zhang
Dielectric polymers, serving as crucial dielectric media in high-power-density energy storage devices, play a pivotal part in modern industries and electrical systems . However, the rapid degradation of breakdown strength and charge-discharge efficiency in elevated temperature environment imposes formidable limitations on the utilization of polymer dielectric under extreme conditions. Here, a series of polyetherimide/polysulfone alternating multilayer composite films are prepared using a non-equilibrium processing method, which effectively blocks the development of breakdown paths by the interface barriers in the multilayer structure. The deep trap sites within the interface capture the charge carriers excited at high temperatures, thus decreasing conduction loss and enhancing the efficiency and breakdown field strength of the dielectric polymer. Consequently, excellent capacitive performances including a high energy density of 5.4 J cm −3 with an efficiency exceeding 90% at 200 °C and cycle stability up to 10 6 cycles have been obtained. Furthermore, the multilayer polymer capacitors (MLPC) constructed from composite films also exhibit significant flexibility and thermal stability. This work provides valuable insights for the advancement of high-temperature energy storage polymers with commercial application value.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Siqi Lan,Zhenguo Huang,Wenyan Huang,Yeqi Zhu,Jiahua Zhan,Shengjian Mao,Zhichao Xue,Rongqian Yao
Demand for SiC-based polymer-derived ceramics (PDCs) employed as hypersonic vehicle components with light weight, high strength, excellent high-temperature/ablation resistance is increasingly urgent. Herein, bulk SiC(Hf, rGO) nanocomposite PDCs were fabricated via re-pyrolyzing ball-milling blends of unique SiC(Hf, rGO) p /polyhafniumcarbosilane-vinyltriethoxysilane-graphene oxide (PHVG). Highly cross-linked PHVG can effectively optimize compact formability and improve ceramic yield. In-situ formed HfO 2 embedded in ceramic network toughens microstructure, while interfacial HfOSi increases structure disorder to improve high-temperature properties. As demonstrated, SiC(Hf, rGO) modified by 3 wt.% Hf and re-pyrolyzed at 1300 °C possess good mechanical performances including hardness (5.83 GPa), fracture toughness (4.29 MPa·m 1/2 ), compressive strength (181.83 MPa) and flexural strength (46.55 MPa). More interestingly, self-healing HfO 2 (HfSiO 4 )/SiO 2 protective layer emerging during 20 min surface ablation test at 1300 °C, timely covers defects and avoids destructive structure, thus retains stable structure and mechanical properties of specimens. Such nanocomposites can promote uses in thermal protection systems (TPS) for hypersonic vehicles against extreme high-temperature 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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Jianling Guo,Yuan Zhang,Shaoxiong Fu,Shuaipeng Yan,Yaqiang Lang,Li Wang,Guangchuan Liang
The practical application of high-voltage LiNi0.5Mn1.5O4 is heavily restricted by serious capacity degradation, especially at high temperatures. Commercial polyolefin separators have shortcomings of poor electrolyte wettability and severe thermal shrinkage. In addition, polyolefin separators cannot prevent the penetration of lithium dendrites for lithium anodes, resulting in electrochemical performance degradation and potential safety concern for lithium-ion batteries. Herein, a homogeneous suspension containing sepiolite is electrospun onto the surface of a poly(propylene) (PP) substrate to produce a composite separator for high-voltage LiNi0.5Mn1.5O4 batteries. Different from previous research, the PP substrate is modified on single and double sides, respectively. The influence of a single-side coating separator on the cathode and the anode is studied. It is found that the sepiolite electrospinning layer can uniformly distribute the current density and form uniform lithium-ion deposition, which can avoid the growth of lithium dendrites. The different assembly directions of the single-side coating separator show great differences in battery performance. The LiNi0.5Mn1.5O4/Li battery using the single-side coating separator with the sepiolite electrospinning layer facing the Li anode shows better cycling stability (74.4% after 200 cycles at 55 °C), greatly alleviating the capacity fading of LiNi0.5Mn1.5O4 batteries at high temperature. The stable solid electrolyte interphase (SEI) layer on the anode surface plays a predominant role in the cycle life of the battery. The single-side coating separator with the sepiolite electrospinning layer facing the anode is more suitable for high-voltage LiNi0.5Mn1.5O4 batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Carbon Letters
·
2023
·Vol. 34
·期 1
·343-350
·
IF 4.5
Liu Bo,Li Xiaoliang,Li Sheng
In order to prevent early distress in asphalt pavement and save on subsequent operational and maintenance costs, modifying asphalt is an effective approach. Styrene–butadiene–styrene (SBS) block copolymers, due to their excellent physicochemical properties, have become a mature and widely used asphalt modifier. Carbon nanotubes (CNTs) possess advantages such as a large specific surface area and high modulus, which, when incorporated into asphalt, can enhance its deformation resistance. To analyze the effect of incorporating CNTs on SBS-modified asphalt (SBS-A), this study analyzed the influence of different CNT concentrations on the high and low-temperature performance and aging properties of SBS-A through penetration, softening point, ductility, dynamic shear rheometry, and short-term aging tests. The optimal CNT concentration was determined to be 1.0%. Furthermore, the changes in the modified asphalt during the aging process were analyzed using infrared spectroscopy.
研究领域:
土木工程
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）