检索结果-南通市图书馆

Nano-Mechanical Behavior and Nano-Tribological Properties of 316 Stainless Steel

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2006年第3期16卷 249-253页

作者： LUO Yong ge shi-rong School of Mechatronics Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China School of Materials Science and Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

The microstructure and nano-tribological properties of 316 austenitic stainless steel have been investigated by using the in situ nano–mechanical testing system TriboIndenter, in which six different normal forces were chosen to make a scratch and indentation. The results show that the contact depth of the indentation increases with the normal force and material is piled up on the edge of the indentation as plastic distortion. The stable nano–hardness and the reduced modulus of 316 austenitic stainless steel are approximately 6 GPa and 160 GPa, respectively. The friction coefficients of 316 stainless steel with conic-type diamond tip have a typical value of about 0.13, 0.15, 0.17, 0.19, 0.22 and 0.25 when the normal forces are kept at 500 μN, 1000 μN, 1500 μN, 2000 μN, 2500 μN and 3000 μN, revealing an increasing trend with the normal forces. The increase of the friction coefficient in the unloading segment may result from the adhesion force caused by the material piled up.

关键词：纳米刻痕不锈钢生物材料摩擦性能磨损

Load Dependence of Nanohardness in Nitrogen Ion Implanted Ti6Al4V Alloy and Fractal Characterization

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2007年第3期17卷 363-367页

作者： LUO Yong ge shi-rong Institute of Trlbology and Rehability Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China School of Mechanical and Electrical Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

Three different nitrogen ion doses were implanted into a Ti6Al4V alloy to improve its mechanical surface properties for the application of artificial joints. The titanium nitride phase and nitrogen element distribution profile were characterized with X-ray photoelectron spectroscopy (XPS). Nano-indentation tests were carried out on the surface of the Ti6Al4V alloy and implanted samples on a large scale of applied loads. The XPS analysis results indicate that ni-trogen diffuses into the titanium alloy and forms a hard TiN layer on the Ti6Al4V alloy. The nanohardness results reveal that nitrogen ion implantation effectively enhances the surface hardness of Ti6Al4V. In addition,the nanohardness clearly reveals load dependence over a large segment of the applied loads. Thus a concept of nanohardness fractal di-mension is first proposed and the dual fractal model can effectively describe nonlinear deformation in indentation areas on the Ti6Al4V surface. The fractal dimension shows a decreased trend in two regions of applied loads,indicating a de-crease of the self-similarity complexity in surface indentation owing to an increase in nanohardness after nitrogen ion implantation.

关键词： Ti6AI4V合金氮离子植入纳米技术硬度

Comparison of Biotribology of Swine Compact Bone Against UHMWPE

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2007年第1期17卷 133-137页

作者： WANG Qing-liang ge shi-rong School of Materials Science and Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

A pin-on-disk tribometer was used, in a comparative test to observe the tribological behavior of the swine femoral bone against UHMWPE with dry friction, physiological water and human plasma lubrication. The wear mechanisms of swine bones and UHMWPE were investigated by SEM. The experimental results of these wear tests demon- strated that both the friction coefficient and wear rate of UHMWPE were the lowest when human plasma lubrication was used. The wear mechanism of the compact bone was mainly fatigue wear with dry friction, corrosive wear under physiological water lubrication and abrasive wear with human plasma lubrication. For UHMWPE, the wear mecha- nism was adhesive wear and plastic deformation with dry friction, serious ploughing and fatigue fracture wear under physiological water lubrication, fine ploughing and plastic deformation with human plasma lubrication. An analysis of nitrogen elements on the wear surface of UHMWPE indicated that the content of nitrogen in worn areas was 16 times higher than that in unworn areas, which proved that serum protein deposition occurred on worn areas.

关键词：工程材料耐磨机械装置多斜面联接材料特性

Error Analysis of Three Degree-of-Freedom Changeable Parallel Measuring Mechanism

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2007年第1期17卷 101-104页

作者： CHENG Gang ge shi-rong WANG Yong Institute of Reliability and Rescue Robotics China University of Mining ＆Technology Xuzhou Jiangsu 221008 China

A three degree-of-freedom (DOF) planar changeable parallel mechanism is designed by means of control of different drive parameters. This mechanism possesses the characteristics of two kinds of parallel mechanism. Based on its topologic structure, a coordinate system for position analysis is set-up and the forward kinematic solutions are analyzed. It was found that the parallel mechanism is partially decoupled. The relationship between original errors and position-stance error of moving platform is built according to the complete differential-coefficient theory. Then we present a special example with theory values and errors to evaluate the error model, and numerical error solutions are gained. The investigations concentrating on mechanism errors and actuator errors show that the mechanism errors have more influences on the position-stance of the moving platform. It is demonstrated that improving manufacturing and assembly techniques can greatly reduce the moving platform error. The small change in position-stance error in different kinematic positions proves that the error-compensation of software can improve considerably the precision of parallel mechanism.

关键词：并行装置驱动系统机构学自动控制

MXene Enhanced 3D Needled Waste Denim Felt for High‑Performance Flexible Supercapacitors

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第2期16卷 383-394页

作者： Wei Fan Qi Wang Kai rong Yang shi Wanxi Peng Handong Li Zhanhu Guo Ben Bin Xu Hua Hou Hassan Algadi Shengbo ge Key Laboratory of Functional Textile Material and Product of the Ministry of Education School of Textile Science and EngineeringInstitute of Flexible electronics and Intelligent TextileXi’an Polytechnic UniversityXi’an 710048People’s Republic of China Co‑Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037People’s Republic of China Henan Province International Collaboration Lab of Forest Resources Utilization School of ForestryHenan Agricultural UniversityZhengzhou 450002People’s Republic of China Integrated Composites Lab Department of Mechanical and Construction EngineeringNorthumbria UniversityNewcastle Upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024People’s Republic of China Department of Electrical Engineering Faculty of EngineeringNajran University11001 NajranSaudi Arabia

MXene,a transition metal carbide/nitride,has been prominent as an ideal electrochemical active material for ***,the low MXene load limits its practical *** environmental concerns and sustainable development become more widely recognized,it is necessary to explore a greener and cleaner technology to recycle textile by-products such as *** present study proposes an effective 3D fabrication method that uses MXene to fabricate waste denim felt into ultralight and flexible supercapacitors through needling and *** 3D structure provided more sites for loading MXene onto Z-directional fiber bundles,resulting in more efficient ion exchange between the electrolyte and ***,the carbonization process removed the specific adverse groups in MXenes,further improving the specific capacitance,energy density,power density and electrical conductivity of *** electrodes achieve a maximum specific capacitance of 1748.5 mF cm-2 and demonstrate remarkable cycling stability maintaining more than 94%after 15,000 galvanostatic charge/discharge ***,the obtained supercapacitors present a maximum specific capacitance of 577.5 mF cm^(-2),energy density of 80.2μWh cm^(-2)and power density of 3 mW cm^(-2),*** resulting supercapacitors can be used to develop smart wearable power devices such as smartwatches,laying the foundation for a novel strategy of utilizing waste cotton in a high-quality manner.

关键词： MXene 3D needled waste denim felt Supercapacitors Carbonization

Distribution of wire deformation within strands of wire ropes

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2008年第3期18卷 475-478页

作者： MA Jun ge shi-rong ZHANG De-kun Mechanical and Electrical Engineering Institute Xuzhou Normal University Xuzhou Jiangsu 221116 China School of Materials Science and Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221116 China

Using ANSYS software, we developed a modeling program for several kinds of wire ropes with metal cores and built a geometric model for the 6×19 IWS wire rope. Through proper grid partitioning, a finite element model for calculating the deforma-tion of wire rope was obtained. Completely constraining one end of the wire rope and applying an axial force to the other end, we established the boundary conditions for solving the model. In addition, we numerically simulated the stress and deformation of the wire, obtaining the deformation distribution of each wire within the wire rope under different laying directions. At the end, a tensile test of the 6×19 IWS wire rope was carried out and the results of simulation and experiment compared.

关键词：钢丝变形钢管模型有限元法

Comparison of the Wear Behavior of UHMWPE Lubricated by Human Plasma and Brine

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2007年第3期17卷 335-340页

作者： WANG shi-bo ge shi-rong NORM Gitis MICHAEL Vinogradov XIAO Jun Institute of Reliability Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China Center for Tribology Incorporated Campell California 95008 USA

The effect of plasma and brine lubricants on the friction and wear behavior of UHMWPE were studied by using the geometry of a Si3N4 ball sliding on a UHMWPE disc under patterns of uni-directional reciprocation and bi-directional sliding motions. The worn surface and wear particles produced in these two lubricants were analyzed. Sliding motion pattern affected the friction coefficients lubricated with plasma,while seldom affected that lubricated with brine. UHMWPE lubricated with plasma showed about half of the wear rate of that lubricated with brine. The two rates were 0.75 pg/m and 2.19 pg/m for the two motion patterns,respectively. However,wear particles generated in plasma included a greater amount of small particles,compared to that in brine. In uni-directional reciprocation,the main wear mechanism is ploughing both in plasma and in brine. In bi-directional sliding modes,the significant characteristic is ripples on the worn surface in plasma,while there are oriented fibers on the worn surface in brine.

关键词：磨损微粒磨损机械润滑 UHMWPE

Friction and Wear Behavior of GCr15 Under Multiple Movement Condition

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2005年第3期15卷 167-171页

作者： WANG shi-bo ge shi-rong LI Wei WANG Qing-liang School of Mechatromcs Engmeering China University of Mining and Technology Xuzhou Jiangsu 221008 China School of Material Science and Engineering China UniversiO of Mining and Technology Xuzhou Jiangsu 221008 China

Friction and wear of GCr15 under cross-sliding condition is tested on a ball-on-disc wear test machine. Thisresult shows that the cross-sliding of friction pair leads to different friction and wear behavior. For the condition de-scribed in this paper, the friction coefficients with ball reciprocating are smaller than that without ball *** friction coefficients increase with the increase of reciprocating frequency.. The wear weight loss of the ball sub-jected reciprocating sliding decreases, however, the wear weight loss of disc against the reciprocating ball increases. Incross-sliding friction, the worn surfaces of the ball show crinkle appearance along the circumferential sliding *** of small strip debris is formed along the plowing traces on the disc worn surface. The plowing furrow onthe disc surfaces looks deeper and wider than that without reciprocating sliding. The size of wear particles fromcross-sliding wear is larger than those without reciprocating sliding.

关键词： GCrl5 复合材料磨损行为摩擦力

Thermotics Study of the Semimetallic Nylon1010 Composite

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2007年第1期17卷 15-19页

作者： HAN Dong-tai ge shi-rong LIU Li-guo School of Mechanical and Electrical Engineering China UniversiO of Mining ＆ Technology Xuzhou Jiangsu 221008 China

Thermal expansion characteristics of semimetal nylon composites (nylon 1010 incorporated with metal oxides) were analyzed with thermal expansion instrument. The changes of composite weight after being heated and the heat absorption and release of the composites were analyzed by carrying out TG-DSC experiments. Experimental results show that the average thermal expansion coefficient of the composites rises as the average diameter of the metal oxides decrease from room temperature to 160 ℃. Thermal dynamics and physical properties of the nylon composites change with the addition of the oxides; the crystallization temperature rises from 180 ℃ of pure nylon to 190 ℃ (maximum) and the melting point of the oxide composites also increases continuously with the addition of the oxides. The water content of the oxide/nylon composite is related to the kind and content of the oxide. The water content reaches its maximum when the content of oxide is 10%, and the 10% Al2O3/nylon composite has a water absorption ratio up to 1%.

关键词：金属氧化物尼龙爆炸物重结晶作用