Nanotechnology Reviews
·
2022
·Vol. 11
·期 1
·3031-3041
·
IF 6.739
Pengfei Li,Minxian Shi,Zongyi Deng,Pengkun Han,Tingli Yang,Rui Hu,Chuang Dong,Rui Wang,Jie Ding
Thermal protection system (TPS) is of great significance to launch hypersonic flight and landing process of hypersonic vehicles, which can effectively shield the hypersonic vehicle from severe aerodynamic heating encountered. Phenolic aerogels play an important role in TPS due to their characteristics of low density, high porosity, and low thermal conductivity. However, phenolic aerogel is easy to be oxidized at elevated temperatures under oxidizing environments, which severely limits its large-scale application as thermal insulation materials in TPS. In this study, a novel TiB 2 –B 4 C/carbon (TB/C) aerogel composite was synthesized by introducing TiB 2 and B 4 C particles into phenolic aerogels through quick-gelation and mechanical mixing. The developed aerogel composites were characterized by scanning electron microscopy, Fourier transform infrared, thermal analysis, etc. , to evaluate their microstructure, oxidation resistance, and mechanical properties. Experimental evidence showed that TiB 2 and B 4 C particles reacted with the oxygen-containing molecules to form TiO 2 –B 2 O 3 layer, which effectively improved oxidation resistance and mechanical properties of phenolic aerogel 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
COMPOSITES SCIENCE AND TECHNOLOGY
·
2020
·
IF 7.094
Hongji Chen,Jianxiao Yang,Qin Shuai,Jun Li,Qin Ouyang,Shu Zhang
The high modulus PAN-based carbon fibers (CFs) were prepared using the B 4 C-doped PAN as a precursor which was synthesized by in-situ polymerization of acrylonitrile monomer with B 4 C nanoparticles , and were characterized to investigate the effects of B 4 C nanoparticles on stabilization and carbonization behaviors of the as-spun fibers and to compare the structural properties of the B 4 C-doped CFs (B-CF) with the pristine CFs (P-CF). The results showed that the B-CF-1000 prepared at carbonization temperature of 1000 °C had lower tensile strength than P–CF–1000 due to the defects and disordered structures in the B-CF-1000 caused by the doped B 4 C, while the B-CF-3000 prepared at graphitization temperature of 3000 °C had much higher tensile modulus of 399 GPa than P–CF–3000 of 251 GPa under the effect of boron catalytic graphitization. Moreover, the skin-core structure of B-CF had significantly improved compared to P-CF, which was caused by the fact that B 4 C inhibited the oxidation reaction and limited the shrinkage of the fibers during stabilization so as to benefit the entry of oxygen into the fiber core. The above results indicated that the in-situ doped B 4 C does play a significant role in catalytic graphitization and improving microstructure of PAN-based CFs.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Bo Xu,Fengyi Wang,Minxian Shi,Zhixiong Huang,Xueyuan Yang
Carbon fiber reinforced ceramizable phenolic resin matrix composites (C f /CPR) have been widely used in the field of thermal protection materials. However, the industrial application of the C f /CPR is restricted by its easy oxidation failure under high temperature condition. In this work, a novel antioxidative ceramizable composites modified with AlB 2 and B 4 C (C f -Q f /CPR) were prepared by using quartz fiber-coated carbon fiber (C f -Q f ) as reinforcements via co-weaving technique. The thermal stability, mechanical properties, interfacial phase evolution and anti-oxidation mechanism of the composites were investigated. The residue yield and the flexural strength of the composites after treatment at 1200°C for 15 min were 93.4 % and 62.4 MPa, increased by 5.4 % and 67.3 % compared with those of C f /CPR. Quartz fiber and ceramic protective layer showed synergistic effect to improve the oxidation resistance of carbon fiber and PyC, confirming good high temperature mechanical properties and oxidation resistance of as-received 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
·
2022
·
IF 5.532
Jinsu Yu,Hsinshen Ho,Jiangyi Chen
As a transmission part, the service life of the shaft parts directly affects the machining efficiency and economic benefit, and requires higher surface hardness and wear resistance. In this study, the Ti/B 4 C/dr40 composite powder was cladded on the shaft part surface via laser cladding to improve the microhardness and wear resistance. The microstructure evolution and phase structure were analyzed to reveal the strengthening mechanism of Ti and B 4 C on dr40 coating. The Ti/B 4 C/dr40 composite coating with low defects and good interface metallurgical bonding quality between coating and substrate was prepared on the 45# steel shaft part. The results show that the main phase in the Ti/B 4 C/dr40 composite coating is TiC, TiB 2 , Cr 2 C 3 , (Ti, Cr) C, (Ti, Cr, Fe, Ni) (C, B). With the addition content of Ti increasing, the grain densifies, the sieve-reticular structure and small strip phase at grain boundary and intergranular area change as massive phase. Moreover, the microhardness improves up to 2.05 times than that of dr40 coating. The in-situ synthesis of carbides and borides are evenly distributed in the coating, which improves the deformation resistance of the coating. In addition, the precipitation and solid solution strengthening caused by reinforcement phase also enhanced matrix strength for supporting reinforcement phases, improving the coating wear resistance.
研究领域:
材料科学
·
机械工程
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Ruxia Liu,Chuandong Wu,Jian Zhang,Guoqiang Luo,Qiang Shen,Lianmeng Zhang
We report on an investigation of the influence of sintering temperature on microstructure and mechanical behaviors of the Al matrix composites. In this paper, the ultrafine grained AA7075/B 4 C composites was synthesized via cryomilling and one-step consolidation. X-ray diffraction (XRD) and transmission electron microscopy (TEM) were utilized for characterization of the grain size of the AA7075/B 4 C composites consolidated at various sintering temperatures. Our results indicated that the grain size increased gradually from ∼73.1 nm to ∼184.7 nm with the sintering temperature increasing from 350 °C to 450 °C. The formation of abnormal grain growth was observed in the AA7075/B 4 C composite consolidated at 500 °C B 4 C particles distributed homogenously, discretely and randomly in the Al matrix based on the observation in Field-emission scanning electron microscopy (FESEM). The porosities were found to decrease in the AA7075/B 4 C composites with the rising of sintering temperature. The Vickers hardness , compressive yield strength and fracture strength of the AA7075/B 4 C consolidated at 450 °C were 233 HV, 724.9 MPa and 834.5 MPa, respectively. The analysis of strengthening mechanisms revealed that increasing of sintering temperature resulted in the sacrifice of grain-boundary strengthening and dislocation strengthening.
研究领域:
材料科学
·
金属基复合材料
·
粉末冶金
·
显微结构表征
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力学行为
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材料加工工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2014
·
IF 2.726
Chuandong Wu,Pan Fang,Guoqiang Luo,Fei Chen,Qiang Shen,Lianmeng Zhang,Enrique J. Lavernia
We report on a study on the influence of Plasma activated sintering (PAS) parameters on the microstructure and mechanical properties of aluminum matrix composites (AMCs). In this paper a commercial Al alloy (7075) reinforced with 7.5 wt.% B 4 C were synthesized using PAS. Specifically, we studied the influence of temperature, in the range of 450 °C to 540 °C, and holding time on the densification behavior of Al-7075/B 4 C composites. Moreover, the influence of residual porosity on mechanical properties of Al-7075/B 4 C composites was established via measurements of Vickers hardness, bending and compressive strength. High mechanical properties including Vickers hardness 181.6 HV, bending strength 1100.3 MPa, high compression yield strength 878.0 MPa and fracture strength 469.3 MPa of the consolidated Al-7075/B 4 C composite sintered at 530 °C for 3 min were achieved and attributed to a fully dense microstructure and a strong interface between matrix and reinforcement.
研究领域:
材料科学
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金属基复合材料
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粉末冶金
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固态加工
·
力学性能表征
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2022
·
IF 6.044
Yang Wang,Qiang Liu,Biao Zhang,Haoqian Zhang,Zhaoxin Zhong,Jian Ye,Yuhan Ren,Liying Shen,Feng Ye,Wen Wang
Inspired by nacreous architecture, the 2024Al/20–50 vol% B 4 C composites with a lamellar-interpenetrated structure were successfully manufactured via freeze casting and pressure infiltration, and the quasi-static and dynamic characteristics were conducted at strain rates ranging from 0.001 to 3000 s −1 . The strength of the composites enhanced as the strain rate increased up to 2000 s −1 since the strain rate hardening effect facilitated the accumulation of dislocations. At the strain rate of 3000 s −1 , the adiabatic shear banding and its induced cracking were formed as the strengthening mechanisms were overcome by the thermal softening, which converted the dislocation structure from dislocation clusters to recrystallized grains, accompanied by a decrease in dislocation density, thereby degrading the compressive strength . A rigid network structure was formed in the composites with high particle content, and each particle had more inter-particle contact points, which made the strength of the composites increase with the increase of particle reinforcement content. This was also the reason why the strain rate sensitivity of the composites was considerably raised by introducing more particle reinforcement . However, increasing particle content heightened the composite susceptibility to strain localization and adiabatic shear damage, resulting in more brittleness of the 2024Al/50 vol% B 4 C composite at high strain rates . These findings could deepen the comprehension of the mechanical response and damage evolution of nacre-like composites exposed to extreme conditions and promote their applications.
研究领域:
材料科学
·
力学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhitao Yu,Minghui Chen,Xuan Kong,Wenyao Sun,Fuhui Wang
Copper matrix self-lubricating composites have the advantage of low friction coefficient, but usually suffer from the low mechanical strength , ductility and wear resistance. Ceramic particles reinforcing has been demonstrated an effective way in strengthening metal matrix composites . However, the poor wettability was always a critical issue. In this study, B 4 C particles were introduced into a copper matrix self-lubricating composite. Before spark plasma sintering , the B 4 C particles were pre-metallized with Ni to form a core-shell microstructure (Ni@B 4 C), which improves wettability and bonding strength with the copper alloy , builds up a coherent/semi-coherent interface, and notably enhances mechanical properties. After the incorporation of pre-metallized Ni@B 4 C particles, the compressive strength , hardness and engineering strain are increased by 62, 113 and 76%, respectively. What is more, the composite exhibits improved tribological performances . Owing to the successful transfer of lubricant WS 2 to the wear surface during sliding as well as the greatly enhanced hardness, its friction coefficient is decreased to 0.16, while the wear rate is reduced to 7.53 × 10 −6 mm 3 /N·m, which is 81% lower than that of CW . The composite achieves well-balanced mechanical and tribological properties after pre-metallized B 4 C particles incorporation.
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
VACUUM
·
2018
·
IF 2.067
Ruifeng Liu,Wenxian Wang,Hongsheng Chen,Minbo Tan,Yuyang Zhang
With the advantage of micro-size and nano-size B 4 C particles, micro-/nano-bimodal size B 4 C particles have been widely used to fabricate excellent composites with high strength and ductility. In this study, micro-/nano-bimodal size B 4 C particles reinforced aluminum matrix composites with three different volume fractions (3%, 5% and 7%) were fabricated by spark plasma sintering (SPS) followed by hot extrusion and rolling (HER). The microstructure evolution and mechanical properties of as-SPSed, as-extruded and as-rolled composites were investigated. Results show that the microscopic electrical discharge between the particles in SPS promotes the densification of composites. The maximum relative density of as-SPSed composites increases from 99.21% to 99.65% after HER. Nano-size B 4 C particles distribute mainly at the gap of 6061Al particles in as-SPSed composites, while the microstructure presents more homogeneous after HER. Pin effect of nano-size B 4 C particles stimulates dynamic recrystallization (DRX) and grain refining. Texture orientation of the 6061Al grain exists in the as-extruded and as-rolled B 4 C/6061Al NCs. No new phases are detected in composites in all deformation stages. The tensile strength of as-SPSed composites increases when compared with 6061Al matrix, and the tensile strength of as-rolled composites after hot extrusion is enhanced to 305 MPa. Fracture mechanisms of as-extruded and as-rolled composites mainly include 6061Al matrix tear, particle/matrix interfacial tear and micro-size B 4 C particle fracture.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Qi Song,Zhao-Hui Zhang,Zheng-Yang Hu,Shi-Pan Yin,Hao Wang,Zhen-Wu Ma
B 4 C ceramics were fabricated by spark plasma sintering with 5% (Ti 3 SiC 2 +Si) as sintering aid. The effects of sintering temperatures and sintering aid on microstructures and properties of B 4 C ceramics were investigated. The results indicated that the addition of a small amount of (Ti 3 SiC 2 +Si) could effectively improve the sintering characteristic of B 4 C ceramics and reduce the sintering temperature. The as-sintered ceramics fabricated at 1700 °C exhibited excellent mechanical properties , including a super-high Vickers hardness of 38.4 GPa, a high flexural strength of 457.6 MPa and a good fracture toughness of 5.61 MPa m 0.5 . Following reasons may be responsible for the improvement of the hardness of B 4 C ceramics: high relative density due to the combination use of (Ti 3 SiC 2 +Si) sintering aids and SPS technology, fine-grained structure of the B 4 C ceramics benefited from the low sintering temperature, formation of the second phases TiB 2 and SiC by chemical reaction and existence of the nano-sized unit of (TiB 2 +SiC) in B 4 C grains.
研究领域:
材料科学
·
陶瓷工程
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Yong Deng,Xinran Gao,Ying Li,Huanfang Wang,Minxian Shi,Chao Zhang
The incorporation of inorganic fillers has demonstrated remarkable potential in enhancing ablation resistance and mechanical performance of polymer composites. However, the evolution of fracture properties of ceramizable composites with temperature remains insufficiently understood, which is significant to the safety and application in thermal protection systems. In this study, the thermal stability, high-temperature flexural properties, and failure mechanisms of MoSi 2 –B 4 C particles modified quartz fabric/boron-phenolic ceramizable composites were investigated. Through three-point bending tests conducted from 25°C to 1100°C, we found that flexural strength generally declines with the rising temperature and decreases as the holding time increases from 10 to 15 min. The high-temperature failure mechanisms of the ceramizable composites were analyzed through macro and micro analysis. It is found that the matrix thermal degradation, accompanied by interface deterioration and multiscale structural damage, is the primary mechanism for the significant reduction in high-temperature flexural strength. However, the ceramization reactions of MoSi 2 and B 4 C contribute to enhanced high-temperature mechanical properties, resulting in an unprecedented improvement in flexural strength observed at 900°C. Moreover, a high-temperature strength model for these ceramizable composites was developed. These findings provide valuable insights for evaluating the performance and potential applications of ceramizable composites in thermal protection systems.
研究领域:
材料科学
·
复合材料
·
高温材料
·
力学性能
·
热防护系统
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Shuhan Dong,Yang Yang,Ruina Ma,An Du,Mingxu Yang,Yongzhe Fan,Xue Zhao,Xiaoming Cao
A Cu/Ni–B 4 C superhydrophobic coating was fabricated on the surface of Q235 steel under different current density via electrodeposition . The distribution of electric field influenced by current density controls the growth of rough structure. Therefore, the effect of current density was measured by the morphology and wettability of coating and analyzed by Electric field distribution model. The coating surface demonstrates the most uniform and compact rough structure at a current density of 3 A/dm 2 (M C-3 ) obtaining contact angle 160 ± 2° after the surface energy reduced by stearic acid. The self-cleaning performance and mechanical stability of M C-3 coating were studied. The potentiodynamic polarization curve (PPC) and electrochemical impedance spectroscopy (EIS) were used to measure the anti-corrosion and protection performance of the coatings with different morphology and contact angle. The protective performance of M C-3 coating soaked in 3.5 wt% NaCl solution for different time was studied by EIS. The wetting stability of different coatings was studied by single frequency impedance spectroscopy. Then the double protective mechanism of superhydrophobic coating was described and the corresponding model was established.
研究领域:
材料科学
·
表面工程
·
腐蚀科学
·
电化学
✓ 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）