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Jiangfan Shi,Yize Liu,Jianxiao Yang,Jun Li,Chong Ye,Dong Huang,Jinshui Liu,Xuanke Li 한국섬유공학회 2020 Fibers and polymers Vol.21 No.8
An upgrade synthesis method of electroless copper plating was developed to prepare the copper-coated mesophasepitch-based carbon fibers (Cu@CF) with APTES (3-Aminopropyl triethoxysilane) grafting modification. The microstructureand properties of the fibers which were prepared by the APTES sensitization method were investigated and compared withthose prepared by the conventional SnCl2 sensitization method. The results showed that as-coated fibers sensitized by APTESdemonstrated to have better interfacial cohesion between the copper layer and the fiber surface than those sensitized by SnCl2did. Moreover, the resistivity of Cu@CF-APTES declined to 2.3±0.9 μΩ·cm, while that of Cu@CF-SnCl2 was 9.3±3.7μΩ·cm. Besides, not only the strength of Cu@CF-APTES increased, but the strength discreteness of them reduced due to thefact that no peeling phenomenon was observed between the copper layer and fiber during the stretch test.
A Novel Interleaved Non-Isolated Switched-Capacitor Network High Step-Up DC/DC Converter
Xinying Li,Yan Zhang,Pengxiang Zeng,Jinshui Zhang,Jinjun Liu 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper introduces a novel interleaved non-isolated high step-up DC/DC converter with switchedcapacitor network. Due to interleaved structure and switched-capacitor network, the proposed converter has the advantage of low input current ripple, high step-up voltage conversion ratio and low voltage stress for all the switches and diodes which means lower voltage level semiconductors and high efficiency. After a detailed comparison with other recent existing topologies, it is clear that the proposed converter has a lower comprehensive cost, higher voltage conversion ratio, and lower output voltage ripple than other converters. The operation principle, steady-state analysis, parameter design for this converter are presented. Finally, experiment results are also presented to demonstrate the effectiveness of the proposed converter.
Hao Wang,Dianwu Zhou,Youruiling Yan,Jinshui Liu,Bo Gao 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.3
Zirconium alloy is extensively used in nuclear industries as cladding and core structural material. However, the formabilityand service behavior are affected due to the anisotropy of mechanical property, which is detrimental to the specific application. In this work, effect of pre-straining and subsequent annealing (PA) on microstructure and mechanical property ofZr–Sn–Nb–Fe zirconium alloy is determined by means of scanning electron microscope equipped with electron backscattersdiffraction and digital image correlation technique. It is found that the basal texture intensity and grain size of as-receivedsample decreases after pre-straining, the work-hardening value (n) increases from 0.126 of as-received sample to 0.152 ofPA samples, while the anisotropy of mechanical property decreases gradually with the increase of pre-straining level. Inaddition, the strength, ductility and work-hardening value (n) of the PA samples tend to be accordant in the transverse direction,rolling direction (RD) and the 45° direction when the pre-straining level reaches 8%. The basal texture is graduallyweakened and dispersed along the RD after annealing, whose orientation is favorable for the activation of pyramidal ⟨c + a⟩slip to accommodate to the strain in thickness direction, which leads to the lower anisotropy (featured by the r-value). Thelow r-value and high work-hardening value (n) are favorable for improving formability. Hence, microstructure and textureof zirconium alloy can be modified though appropriate PA process to improve the comprehensive properties.
Ye Chong,Wu Huang,Huang Dong,Li Baoliu,Shen Ke,Yang Jianxiao,Liu Jinshui,Li Xuanke 한국탄소학회 2019 Carbon Letters Vol.29 No.5
Commercial ultra-high-strength PAN-based carbon fibers (T1000G) were heat-treated at the temperature range of 2300–2600 °C under a constant stretching of 600 cN. After continuous high-temperature graphitization treatment, microstructures, mechanical properties and thermal stability of the carbon fibers were investigated. The results show that the T1000G carbon fibers present the similar round shape with a smooth surface before and after graphitization, indicating the carbon fibers are fabricated by dry–wet spinning. In comparison, the commercial high-strength and high-modulus PAN-based carbon fibers (M40JB and M55JB) present elliptical shapes with ridges and grooves on the surface, indicating the carbon fibers are fabricated by wet spinning. After graphitization treatment from 2300 to 2600 °C under a constant stretching of 600 cN, the Young’s modulus of the T1000G carbon fibers increases from about 436 to 484 GPa, and their tensile strength decreases from about 5.26 to 4.45 GPa. The increase in Young’s modulus of the graphitized T1000G carbon fibers is attributed to the increase in the crystallite sizes and the preferred orientation of graphite crystallites along the fiber longitudinal direction under a constant stretching condition. In comparison with the M40JB and the M55JB carbon fibers, the graphitized T1000G carbon fibers are easier to be oxidized, which can be contributed to the formation of more micropores and defects during the graphitization process, thus leading to the decrease in the tensile strength.
Chong Ye,Huang Wu,Dong Huang,Baoliu Li,Ke Shen,Jianxiao Yang,Jinshui Liu,Xuanke Li 한국탄소학회 2019 Carbon Letters Vol.29 No.5
Commercial ultra-high-strength PAN-based carbon fibers (T1000G) were heat-treated at the temperature range of 2300– 2600 °C under a constant stretching of 600 cN. After continuous high-temperature graphitization treatment, microstructures, mechanical properties and thermal stability of the carbon fibers were investigated. The results show that the T1000G carbon fibers present the similar round shape with a smooth surface before and after graphitization, indicating the carbon fibers are fabricated by dry–wet spinning. In comparison, the commercial high-strength and high-modulus PAN-based carbon fibers (M40JB and M55JB) present elliptical shapes with ridges and grooves on the surface, indicating the carbon fibers are fabricated by wet spinning. After graphitization treatment from 2300 to 2600 °C under a constant stretching of 600 cN, the Young’s modulus of the T1000G carbon fibers increases from about 436 to 484 GPa, and their tensile strength decreases from about 5.26 to 4.45 GPa. The increase in Young’s modulus of the graphitized T1000G carbon fibers is attributed to the increase in the crystallite sizes and the preferred orientation of graphite crystallites along the fiber longitudinal direction under a constant stretching condition. In comparison with the M40JB and the M55JB carbon fibers, the graphitized T1000G carbon fibers are easier to be oxidized, which can be contributed to the formation of more micropores and defects during the graphitization process, thus leading to the decrease in the tensile strength.