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surfaces of filaments were studied by scanning electron microscopy(SEM).The properties of composite filament,such as orientation degree,mechanical properties,and surface friction properties,were...,such as orientation degree,friction coefficient,thermal decomposition temperature,and glass transition temperature,increased more or less.The breaking tenacity increased when 1 wt% SiO2 was added in PLA......
were characterized through X-ray diffraction(XRD). The hardness and the elastic modulus of the coatings were tested by a nano-hardness tester. The adhesion strength and friction coefficients were... substrate displays a uniform thickness and a smooth surface. The mechanical properties behaves well as the N2 flow rate varies. The CrN coating significantly reduces the friction coefficient......
to be ~25 nm and it was coarsened up to ~30 nm after SPS. Nano indentation results of nano composites demonstrated a high hardness of ~280 HV with an elastic modulus of 126 GPa. Wear and friction characteristics with addition of SiC p reinforcement exhibited significant improvement in terms of coefficient of friction and specific wear rate to that of nano structured Al 5083 alloy. The reduction......
diffraction(XRD)stress measurement identified the existence of residual compressive stress on the surface of graded composite.Additionally,the friction and wear tests revealed that the wear resistance of the graphite/cermets self-lubricating composite was improved significantly via the graded structural design,whereas the coefficient of friction changed slightly.关键词:......
of amorphous steel coating(ASC) and crystalline stainless steel coating(SSC)manufactured by high-velocity-air-fuel-spraying was investigated. With increasing normal load, coefficient of friction(COF... a difference in friction behavior between such two coatings can be understood based upon the roles of shear stress and flash temperature. Wear rate of SSC is much higher than that of ASC, suggesting better......
dry sliding wear behavior of the extruded AZ91 alloy treated with Y using a pin-on-disc apparatus was investigated. Wear rates and friction coefficients were measured within a load range of 5–70 N.... The experimental results revealed that, as applied load was increased, the alloy wear rates increased, but the friction coefficients decreased. Four chief operating wear mechanisms were observed......
blunt crack tip can form a inverse piled-up or double piled-up group, depending upon the applied stress intensity factor Klla, lattice friction stress τ f and the distance of the obstruction from... site L, and the decrease in the friction stress τf When it increases to equate the cohesive strength, a microcrack will initiate in front of the piled-up group.关键词:......
results. Via the fractional factorial design, the significant noise factors are obtained, viz, variations of tube properties, fluctuations of tube geometries and friction. Using the virtual Taguchi’s DOE... was conducted under the fluctuations of tube properties, friction and tube geometry. For the processing parameters, considering the variations of friction, material properties and manufacture......
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alloys for shipbuilding GAO Rui, SUN Yao-jun, XU Xi-jun, GUO Ning (Luoyang Ship Material Research Institute, Luoyang 471800, China) Abstract: The application of activating flux for TIG welding of Ti31 titanium alloy was made. This method which can eliminate welding defects such as undercut and weld metal porosity gives full play to the function of activating function of flux. The results show......
