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Featured researches published by S.Q. Wang.


Tribology Transactions | 2012

Wear Characteristics of Ti-6Al-4V Alloy at 20–400°C

X. H. Cui; Y.S. Mao; M. X. Wei; S.Q. Wang

Tribo-oxides of titanium alloy are usually reported to provide low protection from wear. However, in this research, tribo-oxides provide a protective effect for wear. Dry sliding wear tests were performed for Ti-6Al-4V alloy under loads of 50–250 N at 20–400°C. Ti-6Al-4V alloy presented different wear behavior at 400°C than at 20–200°C. At 20°C, the wear loss increased linearly with increased load. The wear loss at 200°C marginally increased under 50–150 N loads and increased rapidly under a load of 200 N, slightly higher than at 20°C. At 400°C, the wear loss decreased under loads of 50–100 N, slightly increased and had the lowest value under loads of 100–200 N, and finally increased rapidly at loads above 200 N. The prevailing oxidative mild wear and the lowest wear loss at 400°C were attributed to the protective effect of tribo- oxides.


RSC Advances | 2016

Separator modified by Ketjen black for enhanced electrochemical performance of lithium–sulfur batteries

Di Zhao; Xinye Qian; Lina Jin; Xiaolong Yang; S.Q. Wang; Xiangqian Shen; Shanshan Yao; Dewei Rao; Youyuan Zhou; Xiaoming Xi

A routine separator modified by a Ketjen black (KB) layer on the cathode side has been investigated to improve the electrochemical performances of Li–S batteries. The KB modified separator was prepared by a facile slurry coating method which offers a low-cost approach to solve the difficulties of Li–S batteries. Li–S cells assembled with this KB coated separator present excellent electrochemical performances in comparison with that of cells with a routine separator. The initial discharge capacity reaches 1318 mA h g−1 at 0.1C, and the reversible discharge capacity is maintained at 815 mA h g−1 after 100 cycles at 1C implying high capacity retention. Meanwhile, it achieves a discharge capacity of 934 mA h g−1 even at 2C demonstrating an excellent rate performance. Furthermore, electrochemical impedance spectroscopy (EIS) shows that the KB separator sample displays a lower charge transfer resistance which is beneficial for the electrochemical kinetics. The improved performance is supposed to be attributed to the porous architecture of the Ketjen black (KB) layer on the routine separator, which served as a physical barrier to block dissolved lithium polysulfides and an upper current collector to facilitate the transition of ions and electrons.


Tribology Transactions | 2010

Characteristics of Extrusive Wear and Transition of Wear Mechanisms in Elevated-Temperature Wear of a Carbon Steel

M. X. Wei; S.Q. Wang; Xianghong Cui; K.M. Chen

The dry sliding wear of a medium carbon steel with different microstructures was measured under the normal load range of 50–150 N at 400°C by a pin-on-disc high-temperature wear setup. The wear behavior and wear mechanism were systematically studied; in particular, the characteristics of extrusive wear and the transition of wear mechanisms were investigated. Under low normal loads, the wear is oxidative type wear. Once the normal load reached a critical value, a mild-to-severe wear transition occurred, and subsequently an extrusive wear prevailed. The mild-to-severe wear transition depended on the microstructure of matrix; the critical normal load of the transition was 112.5 N for tempered sorbite, 125 N for lamellar pearlite, and 137.5 N for tempered martensite and tempered troostite. As oxidative wear prevailed, a thick oxide layer about 20–30 μ m and a plate-like wear debris with regular outline were recognized. However, as the extrusive wear occurred, the wear rate abruptly increased but the friction coefficient was reduced. The extrusive wear predominated due to thermal softening of the matrix and presented a superthin oxide layer (less than 0.5 μ m) and low oxide content on worn surfaces, accompanied by the appearance of ribbon-like wear debris.


Tribology Transactions | 2011

Wear and Friction Characteristics of a Selected Stainless Steel

M. X. Wei; S.Q. Wang; Lan Wang; X. H. Cui

Dry sliding wear tests were performed for 3Cr13 steel with various tempered states at 25–400°C; wear and friction characteristics as well as the wear mechanism were explored. With an increase in test temperature, the wear rate decreased accompanied by an increase in tribo-oxides. The fluctuation of friction coefficient was slight at 25–200°C but became violent at 400°C. At 25–200°C, adhesive wear prevailed due to trace or less tribo-oxides; at 400°C, oxidative wear prevailed with the predominant tribo-oxides of Fe3O4 and Fe2O3. It can be suggested that the antioxidation of the stainless steel postponed the occurrence of oxidative wear to a higher test temperature. For adhesive wear, the wear resistance, roughly following Archards rule, was directly proportional to hardness besides the specimen tempered at 500°C with grain boundary brittleness. But for elevated-temperature wear, a better wear resistance required thermal stability and an appropriate combination of hardness and toughness.


RSC Advances | 2016

Zn-MOF derived micro/meso porous carbon nanorod for high performance lithium–sulfur battery

Xinye Qian; Lina Jin; S.Q. Wang; Shanshan Yao; Dewei Rao; Xiangqian Shen; Xiaoming Xi; Jun Xiang

In order to solve the problems of poor cycling stability and low coulombic efficiency in lithium–sulfur battery, induced by the low conductivity of sulfur and the shuttle effect of soluble polysulfides, a unique micro/meso porous carbon nanorod (MPCN) was fabricated by carbonizing a zinc metal–organic framework (Zn-MOF) precursor, which was prepared by a facile aqueous solution method at room temperature. The mesopores in the MPCN are beneficial for the infiltration of electrolyte and the transportation of Li ions, and the micropores are sufficient to encapsulate sulfur and adsorb the soluble polysulfides. The MPCN–S cathode displays a discharge capacity of about 1000 mA h g−1 at the current rate of 0.5C and retains 740 mA h g−1 after 200 cycles with the coulombic efficiency up to 95%. Moreover, it still has a discharge capacity as high as 850 mA h g−1 when the current rate increased to 2C, which demonstrates a nice rate capability.


Wear | 2013

Tribo-layer and its role in dry sliding wear of Ti–6Al–4V alloy

Y.S. Mao; Lei Wang; K.M. Chen; S.Q. Wang; X. H. Cui


Wear | 2010

Effects of the tribo-oxide and matrix on dry sliding wear characteristics and mechanisms of a cast steel

S.Q. Wang; M. X. Wei; Yutao Zhao


Electrochimica Acta | 2016

Ketjen Black-MnO Composite Coated Separator For High Performance Rechargeable Lithium-Sulfur Battery

Xinye Qian; Lina Jin; Di Zhao; Xiaolong Yang; S.Q. Wang; Xiangqian Shen; Dewei Rao; Shanshan Yao; Youyuan Zhou; Xiaoming Xi


Tribology International | 2011

Effect of tempering conditions on wear resistance in various wear mechanisms of H13 steel

M. X. Wei; S.Q. Wang; Lan Wang; X. H. Cui; K.M. Chen


Tribology International | 2010

Transition of elevated-temperature wear mechanisms and the oxidative delamination wear in hot-working die steels

S.Q. Wang; M. X. Wei; F. Wang; Yutao Zhao

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