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Co-continuous composites are a new class of composites with a unique topological structure. In this study, nickel foam/epoxy/SiC co-continuous composites were designed and prepared through a vacuum infusion process to improve the service life of materials used for corrosive erosion conditions. Optical microscope and scanning electron microscopy coupled with energy-dispersive spectrometry were used...
The wear behaviour of tungsten carbide–cobalt (WC–Co) high-velocity oxy-fuel coatings within the range of room temperature (RT) to 800°C in air and RT to 650°C in argon was studied using a ball-on-disc tribometer. The worn track morphologies, compositions and oxide phases after the tests were analysed by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction analysis...
Material transfer behaviour between a Ti6Al4V blade and an Al–hBN abradable coating during high-speed rubbing was investigated by a high-speed rubbing test rig built by our research group. The effects of single pass depth and linear speed were studied. The transfer mechanism was discussed on the basis of observations of the blade and coating surface and section morphologies as well as comparisons...
The abrasive wear of hardfacing deposits of a complex high alloy (SHS9290) and a tungsten carbide–Ni based metal matrix composite (MMC) has been compared using silica, garnet and alumina grit. In dry sand rubber wheel tests with silica abrasive and pin-on-flat tests with garnet abrasive, the SHS9290 alloy has shown a lower wear rate than the WC–Ni MMC. In comparison, in pin-on-flat tests using alumina...
Tribological behaviors of bulk nanocrystalline ingot iron (BNII) resulting from severe rolling with/without annealing have been compared with those of conventional polycrystalline ingot iron (CPII). The results reveal that in dry sliding the wear loss of BNII is higher than that of CPII, although its hardness is significantly enhanced. The wear loss of annealed BNII is the highest due to its lower...
The influences of heat treatment, variation in Nb content, surface modification and counterface materials on the wear characteristics of new β type Ti-Nb-Ta-Zr alloys and conventional metallic implant alloy Ti-6Al-4V were investigated, using a reciprocal pin-on-disc wear device in a 0.9% NaCl solution. For the wear test of sliding on stainless steel disc, experimental results show that the wear resistance...
This paper deals with the tribological evaluation of plasma nitrocarburizing of commercially sintered low alloy steels. The samples were tested in dry sliding conditions against a cast iron pin. A model for particle detachment in the coatings is proposed, which takes into account the volume expansion in the coating process as a source of internal stresses in the compound layer. Two different routes...
By using a single-pass pendulum impact scratch tester to study wear behavior of several commercial materials, some developments have been made for this testing technique. From the results, four criteria, i.e. specific energy e(= E/V), tangential dynamic hardness H T (= F T /A T ), normal dynamic hardness H N (= F N /A N ) and the scratching friction...
The wear behavior of a TiNi alloy after various heat treatments has been studied in three conditions: sliding wear, impact abrasion and sand-blasting erosion. The results show that for all three conditions, the TiNi in a pseudoplastic state shows much better wear resistance as compared with that in a pseudoelastic state. The wear resistance of a TiNi alloy is mainly dependent on the recoverable strain...
Impact abrasive behavior of a graphite (T300)/polyamide composite was investigated by using a single pendulum scratching device. The results showed that the wear resistance of the composites decreased as the orientation angle β between the fiber axis and the scratching direction increased; the friction coefficient decreased linearly as β increased from 0 to 60°, but increased as β increased from 60...
A kind of polytetrafluoroethylene (PTFE) based multilayer self-lubricating composite material, made of a steel backing, a sintered porous bronze middle layer and a surface layer consisting of a mixture of PTFE and Pb powders, was prepared. The friction and wear properties as well as the limiting PV (pressure times velocity) values of the PTFE composite sliding against stainless steel with lubrication...
A material composed of a steel backing, a sintered porous bronze middle layer and a layer of reinforced PTFE, which is named JS material, was prepared. The friction, wear and limiting PV values of this material under dry friction as well as the lubrication of number 20 mechanical oil were studied using a MPV-1500 friction tester. The worn surface of JS material and the transfer film formed on the...
The wear behavior of SiC particulate-reinforced 2024Al and Al 2 O 3 SiO 2 short fiber-reinforced SCl22A (ASTM) aluminum alloy composites has been investigated in three tests with various impact loadings: (1) sliding wear; (2) impact abrasion; (3) sand-blasting erosion. The results showed that in sliding with a steady load, the wear resistance of the composites was markedly...
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