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Search Results: 1 - 10 of 13600 matches for " QunJi Xue "
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IR study of the interaction between graphite and PTFE during mixing process
Fengyuan Yan,Qunji Xue
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882838
Abstract: By studying the mixture of graphite and PTFE, it can be found that graphite preferentially transferred to the surface of PTFE particle, and the graphite transfer film possesses strong physical absorption on surface of PTFE. The formation of the transfer film on PTFE surface produced a new chemical circumstance around the PTFE surface, similar to the so-called “solvent effect”, which is named “solid solvent effect” in this work. This changing process can be obtained by using IR reflection techniques. Thus, the IR reflection spectroscopy may serve as a method for tribological surface investigations of polymers and their composites.
Plate drag reduction with low surface energy coating in water tunnel
Jun Tian,Qunji Xue
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882467
Abstract: The drag of the flat plate model showed that the low surface energy coating models were capable of reducing drag (18%–30%) in a certain range of speed. For a solid with a low surface energy that has low tensile strength, the effect of surface characteristics on the turbulent structure is measured and a significant difference between Al plate and plate covered coating of low surface energy is found. The tensile slrength of the bond between water and solid material is the predominant parameter.
Plate drag reduction with low surface energy coating in water tunnel

Tian Jun,Xue Qunji,

科学通报(英文版) , 1997,
Abstract: Conclusion The drag of the flat plate model showed that the low surface energy coating models were capable of reducing drag (18%–30%) in a certain range of speed. For a solid with a low surface energy that has low tensile strength, the effect of surface characteristics on the turbulent structure is measured and a significant difference between Al plate and plate covered coating of low surface energy is found. The tensile slrength of the bond between water and solid material is the predominant parameter.
Tribological behaviors of some polymeric materials in sea water
JianZhang Wang,FengYuan Yan,QunJi Xue
Chinese Science Bulletin , 2009, DOI: 10.1007/s11434-009-0578-4
Abstract: Ocean tribology, a new research field of tribology, is being established and developing. The investigation on the tribology in sea water has important significance to ocean exploitation. In this paper, the tribological behaviors of UHMWPE, PTFE as well as Ekonol/PTFE, graphite/PTFE and CF/PTFE sliding against GCr15 steel and Ni-Cr-WC alloy in sea water were investigated, and compared with those in pure water. Results show that the main factors that affect the tribological behaviors of five polymeric materials in sea water are the corrosive effect and lubricating effect of sea water. When polymeric materials sliding against GCr15 in sea water, owing to serious corrosion of counterface by sea water, the surface roughness of the counterface increases largely. As a result, the lubricating effect of medium decreases sharply and the plowing effect of counterface increases greatly. So the friction coefficients and wear rates of five materials sliding against GCr15 in sea water are much larger than those under other conditions. Such wear model, depending on the corrosion of counterface by medium, can be called indirect corrosive wear. Under other three conditions, owing to the more superior lubricating effect of sea water than pure water and the better wettability of Ni-Cr-WC than GCr15, the friction coefficients and wear rates of five materials increase in the following order: sliding against Ni-Cr-WC in sea water < sliding against Ni-Cr-WC in pure water < sliding against GCr15 in pure water. Moreover, compared with other materials, CF/PTFE is the one with more superior plowing and wear resistance in pure and sea water, which is a potential frictional material well suitable for pure and sea water lubrication.
Profile characterization and temperature dependence of droplet control on textured surfaces
RuoTao Feng,XueDong Wu,QunJi Xue
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-010-4294-x
Abstract: Droplet control on textured surfaces has attracted much attention in the fields of drag reduction and high-efficiency microreactors. We investigated the profile characterization and temperature dependence of droplet control between wetting and non-wetting on a series of textured silicon surfaces. Surfaces were fabricated using photolithography, and the temperature-dependent wettability of the single phase regime droplets was characterized using dynamic contact angle measurements. The experiments demonstrated that the profile of textured surfaces characterizes the droplets Leidenfrost point. The Leidenfrost point is proportional to the micro-pillar size and rectangular wave-length of the textured surface and is inversely proportional to ambient temperature. The Leidenfrost droplets moved freely on the textured surface, almost without hysteresis. Droplets could be directed on the surface of microreactors with a low driving force.
EPOXY RESIN MODIFIED BY POLYDIMETHYSILOXANE
端羟基聚二甲基硅氧烷改性环氧树脂

TIAN Jun,XUE Qunji,
田军
,薛群基

材料研究学报 , 1997,
Abstract: A copolymer was synthesied through the copolycondensation of a hydroxyl terminated polydimethysiloxane (PDMS), epoxy resin (EP). The morphology of the polymer was examined by means of TEM. The compatibility between PDMS and EP is improved. The modified re
The Situation of the Tribological Research for Ceramics
陶瓷摩擦学研究的发展现状

Wei Jianjun Xue Qunji,
魏建军
,薛群基

摩擦学学报 , 1993,
Abstract: A review is given of recent study on the friction, wear and lubrication of ceramics. The tribological properties of ceramics (oxide ceramics and nonoxide ceramics) under unlubricated and lubricated conditions were summarized. In particular, the friction and wear properties of oxide ceramics (A12O3, ZrO2) and nonoxide ceramics (Si3N4, SiC) and their wear mechanisms as well as the effects of water, humidity and lubricating oils on their friction and wear properties were discussed. Accordingly, the problems to be further solved are proposed.
Study of Friction and Wear Properties of Metallic Fiber Filled PTFE Based Composite
金属纤维增强PTFE基复合材料的摩擦学性能

Yang Shengrong,Liu Weimin,Xue Qunji,
札生荣

摩擦学学报 , 1998,
Abstract: The friction and wear properties of metallic fiber filled PTFE based composite against steel were evaluated with a reciprocating friction tester. Scanning electron microscopy(SEM) were used to study the worn surfaces. It was found that metallic fiber is very effective to reduce wear, the hybrid metallic fibber is the most effective filler in reducing the wear of PTFE. Tests also show that a steel fiber increases slightly the friction factor of composites, while a copper fiber decreases slightly the friction factor. The dominant mechanism of the fiber in reducing wear is the load supporting action and the resistance of surface fracture of PTFE.
Advancing in Microtribology Research
微观摩擦学研究进展

Xue Qunji,Zhang Jun,
薛群基
,张军

摩擦学学报 , 1994,
Abstract: Early in the 19th century, the characters of friction process on atomic or molecularlevel had been studied. However, the concept of microtribology was proposed until 1980's whenatomic force microscope (AFM) and frictional force microscope (FFM) came out. To develop themicrotribology research, researching advances and the research methods were reviewed. On thebasic research, it was proposed for boundary lubrication; on the application research, it wasproposed for the lubrication of magnetic headerdisk system. The research methods include AFM,FFM , LB technique , surface force apparatus , quartz crystal microbalance , IR , XPS and moleculardynamic simulation, etc. It was mainly applied in tribology of high density magnetiy recordingsystem, micromachine, manufacture of integrated circuit (IC) , microfriction, microwear andmicroadherence etc. In addition, some problems to which should be pay attention in future ofmicrotribology research were point out.
Wear Mechanisms Transition Map of TZP Ceramics under Water Lubrication
TZP陶瓷在水润滑下的磨损机制转变图

Liu Huiwen,Xue Qunji,
刘惠文

摩擦学学报 , 1998,
Abstract: Many applications of TZP ceramics involve prolonged contact with water and/or its solutions. However, until now the wear mechanisms of TZP ceramics under water lubrication has not get the unanimous understanding. The tribological properties of TZP ceramics under water lubrication sliding against 52100 steel have been investigated, and the wear mechanisms of TZP ceramics under water lubrication have been summarized in its wear map. The results obtained indicated that the dominant wear mechanisms of TZP ceramics under mild wear conditions is plastic deformation, whereas under sever wear conditions it is surface fracture. In the transition region, TZP ceramics undergo microploughing and microcracking. The mild and severe wear mechanisms of 52100 steel are plastic deformation and abrasive wear, respectively.
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