The Experts below are selected from a list of 18 Experts worldwide ranked by ideXlab platform
R K Pandey - One of the best experts on this subject based on the ideXlab platform.
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role of micro and nano particles of hbn as a secondary solid lubricant for improving tribo potential of paek composite
Tribology International, 2019Co-Authors: Jitendra Narayan Panda, Jayashree Bijwe, R K PandeyAbstract:Abstract Hexagonal boron nitride (hBN), also called as white graphite is known to exhibit excellent combination of thermal, thermo-physical, mechanical and tribological properties as a filler (solid lubricant). Not much reported on its potential as nano-particles. In this study, micro and nanocomposites of hBN were prepared with the combination of Polyaryl Ether Ketone (PAEK) as a matrix (50%), short glass fibers (GF) (30%) as a reinforcement and natural graphite (10%) as a primary solid lubricant (SL) apart from hBN particles (10%) as a secondary SL. The micro-composite (MC) and nano-composite (NC) contained hBN particles in micron size and combination of micron and nano size (7 and 3%) respectively. The NC exhibited enhanced mechanical and tribological performance compared to the MC. Tribological tests were performed on a pin-on-disc tribometer under dry sliding regime to evaluate PVlimit (pressure x velocity) values. Influence of load and sliding speed on the friction coefficient (μ) and specific wear rate (K0) on the composites was investigated. The composites showed PVlimit of 100 MPa m/s along with μ in the range of 0.04–0.08 and K0 in the range of 2.5–7 × 10− 16 m 3/Nm. It was also found that the superior performance of NC was due to more efficient, thin and coherent film transferred on the disc. Moreover, structural and morphological changes were studied with Raman spectroscopy and scanning electron microscopy (SEM). Wear mechanism of the worn surfaces were discussed using XPS (X-ray photoelectron spectroscopy).
Jitendra Narayan Panda - One of the best experts on this subject based on the ideXlab platform.
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role of micro and nano particles of hbn as a secondary solid lubricant for improving tribo potential of paek composite
Tribology International, 2019Co-Authors: Jitendra Narayan Panda, Jayashree Bijwe, R K PandeyAbstract:Abstract Hexagonal boron nitride (hBN), also called as white graphite is known to exhibit excellent combination of thermal, thermo-physical, mechanical and tribological properties as a filler (solid lubricant). Not much reported on its potential as nano-particles. In this study, micro and nanocomposites of hBN were prepared with the combination of Polyaryl Ether Ketone (PAEK) as a matrix (50%), short glass fibers (GF) (30%) as a reinforcement and natural graphite (10%) as a primary solid lubricant (SL) apart from hBN particles (10%) as a secondary SL. The micro-composite (MC) and nano-composite (NC) contained hBN particles in micron size and combination of micron and nano size (7 and 3%) respectively. The NC exhibited enhanced mechanical and tribological performance compared to the MC. Tribological tests were performed on a pin-on-disc tribometer under dry sliding regime to evaluate PVlimit (pressure x velocity) values. Influence of load and sliding speed on the friction coefficient (μ) and specific wear rate (K0) on the composites was investigated. The composites showed PVlimit of 100 MPa m/s along with μ in the range of 0.04–0.08 and K0 in the range of 2.5–7 × 10− 16 m 3/Nm. It was also found that the superior performance of NC was due to more efficient, thin and coherent film transferred on the disc. Moreover, structural and morphological changes were studied with Raman spectroscopy and scanning electron microscopy (SEM). Wear mechanism of the worn surfaces were discussed using XPS (X-ray photoelectron spectroscopy).
De Bruin A.j.d. - One of the best experts on this subject based on the ideXlab platform.
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Investigating the Degree of Crystallinity in Ultrasonically Welded Thermoplastic Composite Joints
2020Co-Authors: De Bruin A.j.d.Abstract:Ultrasonic Welding is a fusion bonding method that can create high-strength thermoplastic composite joints at very fast speeds. This makes it a very promising method for use in the aerospace industry, though further research is required to mature it. One topic of interest is how the crystallinity of the polymer matrix in the joint is affected by the ultrasonic welding process. This thesis specifically investigated the degree of crystallinity of carbon fibre reinforced lower melting Polyaryl Ether Ketone (LM PAEK) composite. An experimental methodology was developed to measure the temperature at different locations through the thickness of the joint, and extract samples for Differential Scanning Calorimetry analysis. The calculated degree of crystallinity was related to the temperature evolution for different locations in the joint and variation in the welding force and amplitude.Aerospace Engineerin
K Jayanarayanan - One of the best experts on this subject based on the ideXlab platform.
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Polyaryl Ether Ketone based composites for space applications influence of electron beam radiation on mechanical and thermal properties
Materials Today: Proceedings, 2020Co-Authors: Priwiya Peter, Manu Remanan, Shantanu Bhowmik, K JayanarayananAbstract:Abstract In this work, the thermo- mechanical properties of Polyaryl Ether Ketone (PAEK) reinforced with functionalized carbon micro fibres (F- CF) was studied before and after electron beam irradiation. The F- CF in PAEK was melt compounded in a twin screw extruder and then injection moulded. Scanning electron microscopy (SEM) was carried out to ensure the distribution of F- CF in PAEK. Various characterization techniques like tensile properties analysis, differential scanning calorimetry, thermogravimetric analysis was carried out on these polymer composites. A considerable increase was observed in the mechanical properties upto 0.6 wt. % of F- CF in PAEK before exposure to radiation. The percentage elongation decreased for the samples which were exposed to irradiation. The thermal properties analysis indicated the improvement in melting and degradation temperature of the composites after exposure. The enhancement in the various properties could be due to the action of cross linking mechanism in the PAEK structure during electron beam irradiation.
Jayashree Bijwe - One of the best experts on this subject based on the ideXlab platform.
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role of micro and nano particles of hbn as a secondary solid lubricant for improving tribo potential of paek composite
Tribology International, 2019Co-Authors: Jitendra Narayan Panda, Jayashree Bijwe, R K PandeyAbstract:Abstract Hexagonal boron nitride (hBN), also called as white graphite is known to exhibit excellent combination of thermal, thermo-physical, mechanical and tribological properties as a filler (solid lubricant). Not much reported on its potential as nano-particles. In this study, micro and nanocomposites of hBN were prepared with the combination of Polyaryl Ether Ketone (PAEK) as a matrix (50%), short glass fibers (GF) (30%) as a reinforcement and natural graphite (10%) as a primary solid lubricant (SL) apart from hBN particles (10%) as a secondary SL. The micro-composite (MC) and nano-composite (NC) contained hBN particles in micron size and combination of micron and nano size (7 and 3%) respectively. The NC exhibited enhanced mechanical and tribological performance compared to the MC. Tribological tests were performed on a pin-on-disc tribometer under dry sliding regime to evaluate PVlimit (pressure x velocity) values. Influence of load and sliding speed on the friction coefficient (μ) and specific wear rate (K0) on the composites was investigated. The composites showed PVlimit of 100 MPa m/s along with μ in the range of 0.04–0.08 and K0 in the range of 2.5–7 × 10− 16 m 3/Nm. It was also found that the superior performance of NC was due to more efficient, thin and coherent film transferred on the disc. Moreover, structural and morphological changes were studied with Raman spectroscopy and scanning electron microscopy (SEM). Wear mechanism of the worn surfaces were discussed using XPS (X-ray photoelectron spectroscopy).