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A model friction material was formulated with a cashew-modified phenolic resin, short carbon fiber, phenolic particles, barytes and steel fiber. The friction, wear and fade characteristics of this material were determined using a Chase friction material testing machine. The coefficient of friction was found to vary between 0.2 and 0.5 with lower values associated with higher loads, speeds and drum...
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...
This paper presents an experimental study of friction and wear properties of a unidirectional oriented E-glass fiber reinforced epoxy (E-GFRE) composite. Friction and wear experiments were conducted in the normal direction of the fiber orientation against a cylindrical counterface using a pin-on-ring technique for different sliding surface conditions. Friction coefficient and wear rate at various...
The present work is a study of the effect of humidity on the tribological behavior of carbon-carbon composites, including two-dimensional PAN/pitch (designated TM), PAN/CVI (designated E), and pitch/resin/CVI (designated A) formulae. Results indicate that there exist close relationships among friction coefficient, wear rate, and worn surface morphology. Whenever a morphological transition has occurred,...
Running-in, mild and severe wear are three typical wear regimes of a wear system. The running-in wear is of particular interest in MMC/ steel systems. In this paper, the running-in wear was investigated in the system of a steel disk and SiC-particle-reinforced 2014 Al composite pins. It was found that the wear mechanisms of the system were dominated by abrasion and that the fracture of the reinforced...
A deformation-processed Cu 15vol.%Cr in situ composite was made by consumable are melting and casting followed by extensive deformation. A superior combination of mechanical strength and electrical/thermal conductivity was achieved with the composite since Cr filaments existed in the nearly pure copper matrix. The effects of sliding speed and normal pressure on sliding wear behavior and microstructure...
Friction and wear properties of polyester composite reinforced with laminated glass fibres are experimentally examined in three different orientations, namely, cross-laminar CL, and inter-laminar (normal, NL and parallel, PL). The rubbing experiments of the composite specimens are carried out against abrasive paper (silicon carbide, P600) under various sliding speed and loading conditions. Experimental...
This paper studies the wear characteristics of hardened die steel and SiC whisker-plastic composite when they slide against each other. Moreover, a new application of the composite is introduced. It has been demonstrated that the wear of hardened die steel can be minimized by the addition of graphite powder to the composite and aligning whiskers parallel to the contact surface. Alternatively, the...
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...
Experimental studies on wear performance and wear mechanisms of fluoropolymer based composite, non-stick coatings on aluminum substrates were carried out by using particular wear testing methods, i.e. the mechanical tiger paw (MTP) Test and the Nord Test . Both are supposed to simulate household abrasive operating conditions in a laboratory environment. It was found that the wear process involved...
Aluminium-silicon alloys and aluminium-based metal-matrix composites (MMCs) containing hard particles offer superior operating performance and resistance to wear. In industrial processes where abrasive slurries are transported by rotating paddles or impellers, clements fabricated from MMC materials provide higher abrasive resistance and therefore a longer service life compared to those made from iron...
Dynamic mechanical measurements of the viscoelastic behavior of magnetic tapes and substrates are presented. Five types of tapes were analyzed including three polyethylene terephthalate (PET) tapes with metal particulate, barium ferrite particulate, and metal-evaporated coatings. A polyethylene naphthalate (PEN) tape with a barium ferrite particulate coating was also analyzed along with an aromatic...
Solid particle erosion of A356 and the A356-10 vol.% SiC p composite were investigated at room temperature. The composites were fabricated by the melt stir technique and billets were hot extruded. Erosion tests were conducted on these extruded materials with and without T6 treatment. Effect of an excess addition of 0.4% magnesium to the A356 alloy and its composite were also investigated....
Because of their layered structure featuring a sulfur atom double layer bound by van der Waals forces, tantalum and niobium carbosulfides were proposed as solid lubricants. Carbosulfides with high homogeneity and controlled purity have been prepared by combustion synthesis. By means of a two-line tribometer, the tribological properties of bulk Ta 2 S 2 C, (Ta,Nb) 2 S 2...
TiC-reinforced MMCs have been produced in a range of aluminium alloys using a novel casting technique which results in spontaneous incorporation of the particles into the melt and thus strong bonding between the particles and the matrix. The sliding wear behaviour of the extruded composites has been studied as a function of load and particle volume fraction and has been compared with a commercially...
The dry sliding wear behaviour of unreinforced Cu alloy and on CuFe 3 Al composites fabricated by a powder metallurgy technique was tested on a block-on-ring test machine. The effects of the contact pressure and the sliding speed on the wear behavior of CuFe 3 Al composites and wear mechanisms during dry sliding were investigated. The worn surfaces were examined by scanning electron...
In previous work, sliding abrasion by interfacial flint particles was studied for a nickel-base MMC under argon up to 900 o C. In the present investigation flint is replaced by corundum and silicon carbide. The hot hardness of the latter is above that of the NiCrAlSi-matrix and the WC/W 2 C particles, which dramatically lowers the wear resistance of the MMC compared to abrasion by...
This paper, based on orthogonal experimental design method, reports the results of abrasive wear investigations of various composites of ultrahigh molecular weight polyethylene (UHMWPE) reinforced with quartz powder rubbed against abrasive papers under dry conditions. The main purpose was to study the influence of such parameters such as filler particle size, load, sliding speed and abrading particle...
Polytetrafluoroethylene (PTFE) composites filled with different fillers and various filler proportions were made by compression molding. The powders of graphite, copper, copper-coated graphite (CCG), and copper-mixed graphite (CMG) were selected as the fillers. The tribological behaviors of composites in sliding against a stainless steel ring were evaluated on an MM-200 friction and wear tester. The...
The coefficient of friction of delamination surfaces from graphite fiber/epoxy matrix (IM7/8552) composites has been measured in reciprocating sliding. The worn surfaces were examined with a scanning electron microscope and the friction and wear mechanisms were studied. The results show that after an initial wear-in of the surfaces the coefficient of friction will decrease with increasing number of...
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