Three Body Abrasive Wear Behaviour of Polyamide 66/ Polypropylene (PA66/PP) Thermoplastic Blends (original) (raw)
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Journal of Scientific & Industrial Research, 1999
Wear charac teristics o f red mud (RM) filled iSOlacti c polypropylene (PP)/I ow density polyethylene (LDPE) blends are reported. Elastic melt extruder, which was based on Weissenberg pump ha s been used for compounding th e LDPE, PP and RM. The effect of RM loading on th e abrasive wear behaviour is studied. Surfaces of the worn samples are examined usin g scanning electron microscope. The mechani sm of materi al removal is proposed with th e help of surface microstructure. Introducution Polymers and filled polymers have been studied un der various sliding conditions because of th e ir chemi cal resistance, hi gh damping properti es, low noise emi ssion, ability of dry sliding, etc. I - 3 • The problem associated with polymers lies in th eir low operating temperature due to which strength goes down due to the development of creeps under load. In such cases, particulate-filled poly mers can provide a hi gh load capacit y2. These particu late fill ers reduced wear by modifyi ng th...
Effect of blend composition on abrasive wear of red mud filled PP/LDPE blends
1998
Effect of blend composition on abrasive wear behaviour has been studied for red mud (RM) particulate filled blends of isotactic polypropylene (PP) and sernicrystalline low density polyethylene (LDPE) by using two body abrasion tester. Wear rate has been correlated with the composition and structure of the studied systems. Wear rate decreased with the increase of PP content in those blend compositions where PP form the matrix, whereas reverse was observed in case of compositions in which LDPE forms matrix. Mechanism of this behaviour has been explained on the basis of X-ray diffraction studies and interaction amongst the constituents of composites. Chemical resistance, high damping properties for low noise emission, ability of dry sliding etc.!" makes polymers and their blends suitable for wear applications. The problem associated with polymers lies in their low operating temperature due to which strength goes down owing of creep which occurs under a load. In such cases particul...
2021
The diverse nature of polymer with attractive properties is replacing the conventional materials with polymeric composites. The present study is sought to evaluate the wear performance of thermoplastic based composites under the conditions of different loads and sliding speeds. A series of nine different composite materials was developed by using low-density polyethylene (LDPE), high-density polyethylene (HDPE), and polyethylene terephthalate (PET) with replacements of sand i.e. 0, 30, 40, and 50 wt.%. The abrasive wear was evaluated by following the ASTM G65 standard test for abrasive wear through dry-sand rubber wheel apparatus under the applied loads of 34.335, 56.898, 68.719, 79.461 and 90.742 (N), and sliding speeds of 0.05388, 0.7184, 0.8980, 1.0776 and 1.4369 (m/s). The results showed the wear response varies non-linearly with load and sliding speed. The possible correlations between wear and mechanical properties, and throughout discussions for wear behaviors with morphologi...
Materials & Design, 2009
This article presents the mechanical and three-body abrasive wear behaviour of Polyamide 66/Polypropylene (PA66/PP) blend, nanoclay filled PA66/PP and short carbon fiber (diameter 6-7 lm and length 3-4 mm) reinforced PA66/PP nanocomposites. All particulate-filled PA66/PP composites were prepared by using twin screw extrusion followed by injection molding. Maleic anhydride polypropylene (MAgPP) was used as the compatibilizer. The mechanical properties of particulate-filled PA66/PP composites were studied, and the three-body abrasive wear behaviour was assessed by rubber wheel abrasion test under different loads/abrading distances. The results indicate that addition of nanoclay/short carbon fiber in PA66/PP have significant influence on wear under varied abrading distance/loads. Further, it was found that nanoclay filled PA66/PP composites exhibited lower wear rate compared to short carbon fiber filled PA66/PP composites. In addition, the worn surface morphology of the samples was also discussed.
High stress wear studies on addition of polycarbonate in red mud filled isotactic polypropylene
Indian Journal of Engineering and Materials Sciences, 1998
Effect of addition of polycarbonate (PC) on abrasive wear resistance of red mud (RM) filled polypropylene (PP) composites has been studied. Different volume fractions of PC have been incorporated in RM filled PP. Structural changes of samples were studied by using X-ray diffraction technique. Characteristic intensity peaks of PP have been reduced on addition of polycarbonate. Wear losses at different loads have been evaluated for various blend compositions. Wear loss increased with the increase of PC contents in PP/PC/RM composites up to 30 wt%. thereafter wear loss decreased due to morphological changes in composites. Effect of load variation and sliding distance on wear characteristics of blend composites have been measured and discussed based on the observations of worn surfaces.
Influence of reinforcement and lubrication on abrasive wear performance of polyamide
Journal of Synthetic Lubrication, 1991
This paper presents the results of studies on the wear performance of various composites of polyamide (nylon 6,6) reinforced with short carbon fibres and lubricated with a solid lubricant, PTFE, under adverse sliding conditions (abrasive wear). The effects of increasing amounts offillers, fibre orientation, and experimental parameters such as load, and abrading particle size were investigated. The studies revealed that fillers that are very much suitable for adhesive wear applications are detrimental for the abrasive wear mode. Moreover, wear performance showed deterioration with increasing amount offiller concentration. The combination of heterogeneous fillers proved to be detrimental for wear performance. Efforts were made to correlate these investigations with appropriate mechanical properties. It was found that wear performance was greatly influenced by selected experimental parameters. Worn surfaces were examined with SEA4 to have better insight of the wear mechanism.
Studying of Wear Rate for Ternary Polymer Blends under the Influence of Chemical Solutions
2013
This work has been done with use of Epoxy and Novolac resins mixed with either polyurethane (PUR) or polysulphide(PSR) rubbers to compose ternary polymer blends. Two groups of samples are prepared: 1. Blend A (70% Epoxy +15%Novolac+15%PUR). 2. Blend B (60% Epoxy +20% Novolac +20% PSR). These blends were tested by wear instrument, This test is carried out on samples under the influence of normal conditions (room temperature) and after immersion of blend samples in chemical solutions (H2O, H2SO4 and KOH) for (15, 30 and 45) days. The normality for these chemical solutions is (0.2N). After immersion the blend samples in chemical solution, their wear resistance decreased. The properties of blend that contains polyurthane rubber were affected more. The test results are affected by all the chemical solutions, but the alkaline solution KOH is the most effective solution. For wear test, results show that wear rate increases with increasing applied load, and increases or decreases with slidi...
Wear, 2003
The effect of different metallic counterface materials and different surface treatments on the tribological behaviour of polymer and polymer composite under unlubricated, non-conformal and rolling-sliding contact has been investigated. The most widely used polymer materials-unreinforced polyamide 66 and its composite (RFL4036)-were tested. The metallic materials include aluminium, brass and steel and the surface treatments include Tufftride ** treated (known as nitrocarbonising) and magnesium phosphate treated, etc. Tests were conducted over a range of slip ratios at a fixed load of 300 N, 1000 rpm rotational speed using a twin-disc test rig. The experimental results showed that the polyamide composite exhibited less friction and wear than the unreinforced polyamide 66 when running against steel and aluminium counterfaces. However, when tested against brass, polyamide 66 exhibited lower wear than the composite. The surface treatment of steel has a significant effect on the coefficient of friction and the wear rate, as well as on the tribological mechanism, of polyamide 66 composites. It has been observed that a thin film on the contact surface plays a dominant role in reducing the wear and friction of the composite and in suppressing the transverse cracks. This study clearly indicates that both the characteristics of the different counterface metallic materials and the surface treatment greatly control the wear behaviour of polyamide 66 and its composite.
ABM Proceedings, 2014
Polymeric materials, such as polyurethanes and rubbers, are widely used in the mining industry because of their moderate cost and excellent mechanical properties. Such polymers have been used mainly in transportation (conveyor belt systems and pipes coatings) and screening, for their appreciable abrasion wear resistance. Studies revealed the complex influence of test parameters, such as grit size and applied normal load, on the abrasion wear process for polymers. In this study, the abrasive wear behavior of several polyurethanes and rubbers were investigated at room temperature according to a rotary drum abrasion method (DIN 53516). Wear tests were carried out at 26 cm/s test speed and load value of 5 N and 10 N. Corundum paper grit varying from 60 to 400 mesh were used as an abrasive surface. After each test the mass loss of the pin was recorded and the wear rates were calculated from wear volume. The wear surfaces were investigated by scanning electron microscopy.
Tribological Properties of PPS/PA46 Polymer Blends
Research on Engineering Structures and Materials, 2020
In this study, the tribological performance of originally 40 wt.% fiber glass reinforced polyphenylene sulfide (PPS-G), polyamide 46 (PA46) and their blends were studied at dry sliding conditions. The materials were mixed and extruded on the twin screw extruder. The blends were dried and tribological test specimens were manufactured by using the injection machine. Wear tests were performed with the configuration of a polymer pin on a rotating X40CrMoV5-1 steel disc. Test conditions were atmospheric conditions having 60, 90, 120 N loads and 0.5, 1.0, 1.5 m/s sliding speeds. The obtained results proved that the coefficient of friction for PPS-G, PA46 and their blends is decrease while the applied load and sliding speed values are increase. On the other hand, the specific wear rate is in increase while the applied load and sliding speed values are in increase.