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 Wysłany: Nie 1:10, 19 Gru 2010 Temat postu: ugg prezzo A major breakthrough in nanotechnology |
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A major breakthrough in nanotechnology research
ampleswithdifferentvolumecontentofcarbonfiber, and played a certain role of self-lubricating [4l5j. The more long carbon fiber content, the greater the area of coating. Different morphology of the worn surface of the fiber content as shown in Figure 4. Figure 4a for the content of carbon fiber 2, the sample after grinding 1Or worn surface along the rubbing direction has obvious wear scar, but also irregular flaking; when the fiber content increased to 5, no obvious wear scar, the surface of more than 5O outcrop area is a fiber (as shown in Figure 4b), so greatly improved wear resistance (see Figure 3); when the fiber content reaches 1O, the wear surface outcrop mostly fiber (as shown in Figure 4c), wear resistance further increase, but because of wear mechanisms of the same sample with 5 levels, so the increased wear resistance decreases (see Figure 3). Friction and wear process is essentially a process of energy release. As for wear, friction surface temperature will gradually increase and reach an equilibrium temperature of I6]. Friction surface of hard particles can prevent the metal fiber substrate and the large area of friction between the adhesive,[link widoczny dla zalogowanych], so that the possibility of matrix adhesion declined significantly, making the temperature rise due to friction are subject to certain restrictions _7; addition composite materials because of Fiber will absorb part of the fracture energy can also reduce part of the friction heat, so that wear resistance of the lead. 3 Conclusion (1) With the increase of the carbon fiber composite material hardness. (2) the electrical conductivity of composite materials with carbon fiber content increases. Carbon fiber content 59,6, due to wear the same mechanism,[link widoczny dla zalogowanych], increase wear resistance decreases. Reference: Eli Cuichun Xiang, Zhao Xiaohong. Carbon fiber composite materials and one bronze [J]. Hebei University of Technology, 2002,31 (6) :43-48. [2] Fung, should MEI FONG, WANG Cheng-fu, et al. Short carbon fiber reinforced copper matrix composite friction and wear properties of EJ]. NEW PROCESS, 1995, (6) :37-4O. E3] Wang Jiguo. The chemical copper plating of carbon fiber surface EJ]. New Carbon Materials, 1996,11 (4) :44 - 48. I-4] Fung, should MEI FONG, WANG Cheng-fu,[link widoczny dla zalogowanych], et al. Short carbon fiber content on a carbon fiber composite material properties of copper IJ]. Composite Materials, 1994,11 (1) :37-39. E53WangYL, ZhouFG, WanYrZ. EffectofInterracialBondingStrengthonThermalExpansionBehaviorofCarbon-Fiber-ReinforcedCopper-MatrixCompositesI-J]. JournalofCompositesTechnologyandResearch ,2003,6:165-170. E6] never listen to the whole. Engineering Tribology rM]. Hangzhou: Zhejiang University Press, 1990. [7] never heard the whole, Shi Gaoyi. Friction and wear theory [M]. Hangzhou: Zhejiang University Press, 1992. E8] Wang Rongguo, Wuwei Li, Gu miles. Introduction to composite materials,[link widoczny dla zalogowanych], EM]. Harbin: Harbin Institute of Technology Press, 1999. A major breakthrough in nanotechnology research and research group in Tsinghua University, Li Yadong functional nano-materials synthesis and applications has made a series of breakthroughs. The study group in the low-dimensional nanomaterials of vanadium oxide nanobelts, nanowires of silver with different structures,[link widoczny dla zalogowanych], three-dimensional linear array of lead sulfide, rare earth phosphate nanowires, nanobelts of bismuth oxide bromide, nickel selenium microspheres, soluble titanium dioxide nanocrystals Controlled synthesis of hollow microspheres oxide, and the crystal face associated with catalysis, surface enhanced physical and chemical phenomena such as the research has also made a number of progress.
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