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Better Wear Resistance (good + wear_resistance)
Selected AbstractsTribological properties of bismaleimide composites with surface-modified SiO2 nanoparticlesJOURNAL OF APPLIED POLYMER SCIENCE, Issue 3 2008Hongxia Yan Abstract In this article, the surface of SiO2 nanoparticles was modified by silane coupling agent N -(2-aminoethyl)-,-aminopropylmethyl dimethoxy silane. The bismaleimide nanocomposites with surface-modified SiO2 nanoparticles or unmodified SiO2 nanoparticles were prepared by the same casting method. The tribological performance of the nanocomposites was studied on an M-200 friction and wear tester. The results indicated that the addition of SiO2 nanoparticles could decrease the frictional coefficient and the wear rate of the composites. The nanocomposites with surface-modified SiO2 nanoparticles showed better wear resistance and lower frictional coefficient than that with the unmodified nanoparticles SiO2. The specific wear rate and the steady frictional coefficient of the composite with 1.0 wt % surface-modified SiO2 nanoparticles are only 1.8 × 10,6 mm3/N m and 0.21, respectively. The dispersion of surface-modified SiO2 nanoparticles in resin matrix was observed with transmission electron microscope, and the worn surfaces of pure resin matrix and the nanocomposites were observed with scanning electron microscope. The different tribological behavior of the resin matrix and the filled composites should be dependent on their different mechanical properties and wear mechanism. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 [source] Creep Behavior of Plasma-Sprayed Zirconia Thermal Barrier CoatingsJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 9 2007Reza Soltani Thermally sprayed ceramic coatings deposited from nanostructured feedstock powder have often demonstrated improved properties relative to coatings produced from conventional powders. This type of coating has been reported to exhibit better wear resistance and higher adhesion strength compared with conventional deposits. Powder consisting of hollow spherical particles has been reported to produce coating with lower unmelted particles and lower thermal conductivity. In this study, the thermo-mechanical properties of plasma-sprayed yttria-stabilized zirconia coatings deposited using each of these types of powder were investigated. Creep strain and creep rate were measured using free-standing thick coatings loaded in a four-point bend configuration at temperatures ranging from 800° to 1200°C in air under a range of loads. The creep exponent and activation energy were determined. [source] Tribological behaviors of aligned carbon nanotube/fullerene-epoxy nanocompositesPOLYMER ENGINEERING & SCIENCE, Issue 8 2008Huan Wang The tribological properties of aligned CNT/fullerene-epoxy nanocomposites were studied by nanoscratch, nanowear, and nano-indentation tests. Compared with neat epoxy, aligned CNT/fullerene-epoxy nanocomposites showed lower friction coefficient in scratch tests, a reduction of 38.1 and 26.2%, respectively. In addition, the aligned CNT-epoxy composite showed better wear resistance and its hardness and Young's modulus increased by 29.4 and 16.8%, respectively. In contrast, for a fullerene-epoxy nanocomposite with 10 wt% fullerenes, the hardness decreased by 50% and the Young's modulus decreased by more than 60% when compared with the neat epoxy. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers [source] Tribological properties of hydrophilic polymer brushes under wet conditionsTHE CHEMICAL RECORD, Issue 4 2010Motoyasu Kobayashi Abstract This article demonstrates a water-lubrication system using high-density hydrophilic polymer brushes consisting of 2,3-dehydroxypropyl methacrylate (DHMA), vinyl alcohol, oligo(ethylene glycol)methyl ether methacrylate, 2-(methacryloyloxy)ethyltrimethylammonium chloride (MTAC), 3-sulfopropyl methacrylate potassium salt (SPMK), and 2-methacryloyloxyethyl phosphorylcholine (MPC) prepared by surface-initiated controlled radical polymerization. Macroscopic frictional properties of brush surfaces were characterized by sliding a glass ball probe in water using a ball-on-plate type tribotester under the load of 0.1,0.49,N at the sliding velocity of 10,5,10,1,m,s,1 at 298,K. A poly(DHMA) brush showed a relatively larger friction coefficient in water, whereas the polyelectrolyte brushes, such as poly(SPMK) and poly(MPC), revealed significantly low friction coefficients below 0.02 in water and in humid air conditions. A drastic reduction in the friction coefficient of polyelectrolyte brushes in aqueous solution was observed at around 10,3,10,2,m,s,1 owing to the hydrodynamic lubrication effect, however, an increase in salt concentration in the aqueous solution led to the increase in the friction coefficients of poly(MTAC) and poly(SPMK) brushes. The poly(SPMK) brush showed a stable and low friction coefficient in water even after sliding over 450 friction cycles, indicating a good wear resistance of the brush film. © 2010 The Japan Chemical Journal Forum and Wiley Periodicals, Inc. Chem Rec 10: 208,216; 2010: Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/tcr.201000001 [source] | ||||||||||