A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
N, Jegadeeswaran
- Characterization of Stellite-6 high velocity oxy-fuel coating on titanium alloy
Authors
1 School of Mechanical Engineering, REVA University, Bangalore 560064, Karnataka, IN
2 School of Applied Science, REVA University, Bangalore 560064, Karnataka, IN
Source
Journal of Mines, Metals and Fuels, Vol 69, No 12A (2021), Pagination: 20-23Abstract
In the present investigation, cobalt based coating powder namely Stellite-6 was sprayed on titanium alloy (Ti-31) when used in gas turbines by high velocity oxy-fuel method. The microstructure and mechanical properties of the coatings were characterized like coating thickness, density, porosity, surface roughness and micro hardness. The advanced characterization of using advanced microscopy of X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM/ EDX). Followed by fracture toughness of the coating was measured by Palmqvist method. The very good bonding strength between coating and substrate material were identified.Keywords
Fracture toughness, Stellite-6, Ti-31, HVOF, characterization etc.References
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- Oskarsson, H. (2007): “Material challenges in industrial gas turbines.” Proc., of Sino-Swedish Structural Materials Symposium, 11-14.
- Wright, I.G. and Gibbons, T.B. (2007): “Recent developments in gas turbine materials and technology and their implications for syngas firing.” Int. Journal of Hydrogen Energy, 32, 3610-3621.
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- Sidhu, T. S., Prakash. and Agrawal. (2006): “Hot corrosion resistance of high velocity Oxy-fuel sprayed coatings on a nickel-based superalloy in molten salt environment.” J. Thermal Spray Technol., 15(3), 387-399.
- Niihara, K. (1983): “A fracture-mechanics analysis of indentation-induced palmqvist crack in ceramics.” Mater. Letters, 2, 221-223.
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- Oxidation performance of CNT-reinforced Cr3 C2 -NiCr coatings sprayed by HVOF method
Authors
1 Dept.of Mechanical Engineering, B.M.S. College of Engg., Bengaluru, IN
2 Dept. of Mechanical Engineering, B.M.S. College of Engg., Bengaluru, IN
3 School of Mechanical Engg., REVA University, Bengaluru, Karnataka, IN
Source
Journal of Mines, Metals and Fuels, Vol 69, No 12A (2021), Pagination: 214-223Abstract
The high-temperature oxidation performance of thermal sprayed nanocomposite coatings is discussed in the present study. The three combinations 3, 5, and 7% wt. of CNT reinforced Cr3C2-25% NiC coatings sprayed by HVOF on SAE-213 T12 boiler tube alloy steel working at 6000C in silicon tubular furnace following 1hour heating and 20 minutes cooling in atmospheric temperature for 50 cycles. Thermally developed oxidized layer formation influences in structural variations on surface morphology, phases of elements of uncoated and CNT coated sample were analysed using SEM/EDS and XRD techniques. The thermogravimetric approach was used to estimate the kinetics of oxidation on all samples the weight gain measurement has been studied. The weight accumulation of bare substrate has a higher rate of oxidation than the CNT coated samples. The weight gain of the samples oxidation mechanism generally represents parabolic in nature. The oxidation growth rate minimizes when CNT reinforced in coatings and oxidizing scale deposited on CNT coated surface significantly lower than uncoated samples. The developed Cr2O3, NiO, and Fe2O3 oxidized layers were provided intensifying oxidation resistance.Keywords
High velocity oxy-fuel (HVOF), carbon nanotube (CNT), oxidation, boiler tube alloy steel, thermogravimetric analysis, elevated temperature.References
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- Oxidation resistance by HVOF coating of MDN-121 on turbine material
Authors
1 School of Mechanical Engineering, REVA University, Bangalore 560064, Karnataka, IN
Source
Journal of Mines, Metals and Fuels, Vol 69, No 12A (2021), Pagination: 265-268Abstract
Surface corrosion, such as oxidation, occurs in gas turbines at high-temperature locations such as turbine edges. Because of the absconds, the turbines became less compelling and loud. The focus of the exhibit is on a high speed oxy-fuel coating of MDN-121 unusual steel using a blended mix of cermets powder consisting of 25% Cr3C2- NiCr+75% NiCrAlY. In a hot environment at 750oC, oxidation tests were performed on coated and uncoated MDN-121. Cycles of 1 hour warming and 20 minutes cooling were used in thermogravimetric testing. Weight estimation was done after each cycle. The tests were characterized using XRD and SEM/EDS after 50 cycles were completed. It was observed that the coated test is more oxidation safer than the uncoated test. Surface morphology from SEM/EDS shows that the surface is wealthy in oxides. Gravimetric examination demonstrated that the weight picks up of the test takes after a illustrative relationship with time. The rate steady for the coated test was much for the coated sample was much lesser compared to the uncoated sampleKeywords
Fracture toughness, stellite-6, Ti-31, high velocity oxyfud (HVOF), characterization etc.References
- Ivan Anzel, (2005): “High Temperature Oxidation of Metals and Alloys”, Metalurgija–journal of Metallurgy, p.p 326-336
- Sidhu, B.S., Puri, D. and Prakash, S. (2005): “Mechanical and metallurgical properties of plasma sprayed and laser remelted Ni-20Cr and satellite-6 coatings.” Journal of Materials Processing Technology, 159 (3), 347-355.
- Sidhu, T.S., Malik, A., Prakash, S. and Agarwal, R.D. (2007): “Oxidation and hot corrosion resistance of HVOF WC-NiCrFeSiB coating on Ni- and Fe- based superalloys at 800 ºC.” J. Thermal Spray Technol., 16(5-6), 844-849.
- Mevrel, R. (1989): State of the art on high-temperature corrosion-resistant coatings. Materials Science and Engineering.
- Oskarsson, H. (2007): “Material challenges in industrial gas turbines.” Proc., of Sino-Swedish Structural Materials Symposium, C
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- Heath, G.R., Heimgartner, P., Irons, G. and Miller. (1997): “An assessment of thermal spray coating technologies for high temperature corrosion protection.” Material Science Forum, 251-54, 809-816.
- Sidhu, T. S., Prakash. and Agrawal. (2006): “Hot corrosion resistance of high velocity Oxy-fuel sprayed coatings on a nickel-based superalloy in molten salt environment.” J. Thermal Spray Technol., 15 (3), 387-399.
- Dynamic Mechanical Analysis on Jute Fiber Reinforced Polymer Composites for Patella Implant
Authors
1 School of Mechanical Engineering, Faculty of Engineering, Reva University, Bangalore. India., IN
2 Department of Aerospace Engineering VTU, CPGS, Muddenahalli, Chikkaballapura. India., IN
3 Department of Mechanical Engineering, Faculty of Engineering, Ramaiah Institute of Technology, Bangalore. India., IN
4 Department of Mechanical Engineering, Sapthagiri College of Engineering, Bangalore. India., IN
Source
Journal of Mines, Metals and Fuels, Vol 70, No 10A (2022), Pagination: 52-58Abstract
Natural fibres possess convincing properties when reinforced in polymers. In this study, JFRPs viscoelastic behaviour at low and elevated temperatures were explored. The present work focuses on the fabrication of jute reinforced polyester based polymer composites with different fiber compositions. Untreated long Jute fibres and mat structured Jute fibres were used for preparing the specimens. The Dynamic Mechanical Analysis (DMA) test was carried out on selected developed Polymer Matrix Composites (PMC). Density of selected PMCs are nearly equal to the bone density. So, PMC specimens were considered to carry out thermal analysis using DMA. In particular, by dynamic mechanical analysis experiments, properties such as storage modulus, loss modulus, tanδ and glass transition temperature were determined. It was found that the storage modulus (E’) recorded above the glass transition temperature (Tg) varies with increase in temperature. Along with the previous research of material properties for possible bioimplantation, this Tg value is identified for possible implementation as patella bone implant. The loss modulus (E”) and damping peaks (Tan δ) values were found to be reduced with increasing matrix loading and temperature.
Keywords
Polymer Composites, Dynamic Mechanical Analysis, Storage Modulus, Loss Modulus, Tan Delta and Glass Transition Temperature.References
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