检索结果-南通市图书馆

维普期刊数据库

Mechanical and thermal properties of AA7075/TiO2/Fly ash hybrid composites obtained by hot forging

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2017年第4期27卷 474-481页

作者： K.V.Shivananda Murthy D.P.Girish r.keshavamurthy Temel Varol Praveennath G.Koppad Department of Mechanical Engineering Government Engineering Colleg 2. Department of Mechanical Engineering Dayananda Sagar College of Engineering 3. Department of Metallurgical and Materials Engineering Karadeniz Technical University 4. Department of Mechanical Engineering CMR Institute of Technology

In the present paper, multiple reinforcements TiO2 and fly ash were utilized for the fabrication of AA7075 matrix based hybrid composites using stir casting technique followed by hot forging. In hybrid composites, the fly ash content was fixed to 3 wt% while that of TiO2 was varied from 2.5 to 10 wt%. Scanning electron microscopy images revealed homogenous dispersion of both the reinforcements in AA7075 *** test was conducted to study the mechanical behaviour of hybrid composites. The hybrid composites showed increase in compressive strength with the incorporation of multiple reinforcements and further increased with the increase in the weight fractions of TiO2 particles. The coefficient of thermal expansion was measured between 50 and 250 ℃ with a high precision thermal mechanical analyser. The thermal coefficient of hybrid composites decreased with the addition of TiO2 and fly ash. However a slight decrease in thermal conductivity of hybrid composites was observed when compared to that of AA7075 alloy.

关键词： Hybrid composites Hot forging Mechanical properties Thermal properties

Microstructure and dry sliding wear behavior of Cu-Sn alloy reinforced with multiwalled carbon nanotubes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2016年第7期26卷 1755-1764页

作者： H.M.MALLIKArJUNA K.T.KASHYAP P.G.KOPPAD C.S.rAMESH r.keshavamurthy Advanced Composites research Centre (ACrC) P E S Institute of Technology Department of Mechanical Engineering GEC Department of Mechanical Engineering Atria Institute of Technology research and Development Rapsri Engineering Products Company Ltd. Department of Mechanical Engineering Alliance College of Engineering and Design Alliance University Department of Mechanical Engineering Dayananda Sagar College of Engineering

Multiwalled carbon nanotubes （MWCNTs） reinforced Cu-Sn alloy based nanocomposite was developed by powder metallurgy route. The mass fraction of CNTs was varied from 0 to 2% in a step of 0.5%. The developed nanocomposites were subjected to density, hardness, electrical conductivity, and friction and wear tests. The results reveal that the density of nanocomposite decreases with the increase of the mass fraction of CNTs. A significant improvement in the hardness is noticed in the nanocomposite with the addition of CNTs. The developed nanocomposites show low coefficient of friction and improved wear resistance when compared with unreinforced alloy. At an applied load of 5 N, the coefficient of friction and wear loss of 2%CNTs reinforced Cu-Sn alloy nanocomposite decrease by 72% and 68%, respectively, compared with those of Cu-Sn alloy. The wear mechanisms of worn surfaces of the composites are reported. In addition, the electrical conductivity reduces with the increase of the content of CNTs.

关键词： Cu-Sn alloy carbon nanotube nanocomposites powder metallurgy microstructure sliding wear

维普期刊数据库

Effect of carbon nanotube and silicon carbide on microstructure and dry sliding wear behavior of copper hybrid nanocomposites

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2016年第12期26卷 3170-3182页

作者： H.M.MALLIKArJUNA C.S.rAMESH P.G.KOPPAD r.keshavamurthy K.T.KASHYAP Advanced Composites research Centre P E S Institute of Technology Department of Mechanical Engineering Government Engineering College Department of Mechanical Engineering Alliance College of Engineering & DesignAlliance University Department of Mechanical Engineering CMR Institute of Technology Department of Mechanical Engineering Dayananda Sagar College of Engineering Department of Mechanical Engineering School of Engineering and TechnologyJain University

Microstructure and tribological properties of copper-based hybrid nanocomposites reinforced with copper coatedmultiwalled carbon nanotubes (MWCNTs) and silicon carbide (SiC) were studied. Carbon nanotube was varied from 1% to 4% withsilicon carbide content being fixed at 4%. The synthesis of copper hybrid nanocomposites involves ball milling, cold pressing andsintering followed by hot pressing. The developed hybrid nanocomposites were subjected to density, grain size, and hardness *** tribological performances of the nanocomposites were assessed by carrying out dry sliding wear tests using pin-on-steel disctribometer at different loads. A significant decrease in grain size was observed for the developed hybrid composites when comparedwith pure copper. An improvement of 80% in the micro-hardness of the hybrid nanocomposite has been recorded for 4% carbonnanotubes reinforced hybrid composites when compared with pure copper. An increase in content of CNTs in the hybridnanocomposites results in lowering of the friction coefficient and wear rates of hybrid nanocomposites.

关键词： copper carbon nanotubes (CNTs) SiC microhardness wear mechanisms nanocomposite

维普期刊数据库

Helianthus-annuus assisted synthesis of ZrO_(2) nanoparticles:Enhanced electrochemical,photoluminescent,and optical properties

在线全文

学校读者我要写书评

暂无评论

ChemPhysMater 2023年第2期2卷 148-154页

作者： Gurushantha Kariyanna Surendra Boppanahalli Siddegowda Anantharaju Kurupalya Shivram keshavamurthy Kempaiah Department of Chemistry M S Ramaiah Institute of TechnologyBengaluru 560054India Department of Chemistry Dayananda Sagar College of EngineeringShavige Malleshwara HillsKumaraswamy LayoutBengaluru 560111India Department of Physics Vivekananda Institute of TechnologyBengaluru 560074India

Cubic-phase ZrO_(2) nanoparticle(NPs)were synthesized using a cost-effective single-pot green combustion method and Helianthus annuus extract,and their properties were *** X-ray diffraction was used to inves-tigate the purity,crystal structure,and size of the NPs,and the average size of the NPs was determined to be∼25 *** internal surface morphology of the NPs with distinct voids and pores were observed using scanning electron microscopy(SEM)Ultraviolet-visible(UV-vis)absorption spectroscopy was used to analyze the optical properties of the as-synthesized ZrO_(2) NPs,and their energy bandgap was determined to be 4.5 *** photo-luminescence(PL)spectrum of the cubic-phase ZrO_(2) NPs presented a broad band in the UV-vis *** PL emission properties of the ZrO_(2) NPs were studied by analyzing their emission wavelength at∼490 nm,and the results revealed that the NPs can be efficiently used for display *** electrochemical properties of a graphite-ZrO_(2) NP electrode was qualitatively analyzed by performing cyclic voltammetry(CV)and electrochem-ical impedance spectroscopy experiments in a three-electrode system with a 0.1 M KCl solution as the *** results suggested that the NPs can be used to evaluate the thermodynamics of the redox reaction,and their capacitance was determined using the CV curves of a graphite-ZrO_(2) working electrode at different scan rates in the range of 0.01∼0.05 V/s at room ***,the photodegradation rate of reactive Blue 4 textile dye over the as-prepared ZrO_(2) NPs reached 97%under UV-vis light irradiation.

关键词： ZrO_(2)NPs Helianthus annuus extract Photoluminescence Photocatalytic activity

Sand Slurry Erosive Wear Behavior of Hot Extruded Al6061-SiC Composites

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Minerals and Materials Characterization and Engineering 2011年第6期10卷 493-505页

作者： C.S. ramesh r. keshavamurthy Department of Mechanical Engineering PES Institute of Technology 100ft Ring Road BSK III Stage Bangalore-560 085.

Aluminum based composites are very popular in automotive and aerospace segments. In particular aluminum alloy-SiC composite systems are widely studied and seriously explored for various other applications in defense and space. However they have not been looked at as potential materials in naval and chemical applications where synergistic effects of both wear and corrosion need to be addressed to. This needs the assessment of wear behavior of composites. From the survey, it is evident that major focus is on mechanical and corrosion properties of cast composites. However, meager information is available as regards the slurry erosive wear behavior of cast and extruded metal matrix composites. In the light of the above, the present investigation is aimed at studying in detail the slurry erosive wear behavior of cast and hot extruded Al6061 and Al6061-SiC composites in sand slurry. Al6061-SiC composites have been prepared primarily by vortex method. Hot extrusion of these composites and the matrix alloy has been carried out at 550℃ using a 500T hydraulic press. Both as cast and hot extruded composites have been subjected to microstructure studies, microhardness, and slurry erosive wear tests. The hot extruded composites exhibit higher hardness, and slurry erosive wear resistance when compared with as cast alloy and its composites.

关键词： Slurry erosive wear Hot extrusion Composites Silicon carbide.

Slurry Erosive Wear Behavior of Plasma Sprayed Inconel-718 Coatings on Al6061 Alloy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Minerals and Materials Characterization and Engineering 2011年第5期10卷 445-453页

作者： C.S. ramesh Suresh Kumar D.S. Devaraj r. keshavamurthy Department of Mechanical Engineering PES Institute of Technology Bangalore KarnatakaIndia Department of Mechanical Engineering SBMJCE Ramanagaram District. Karnataka India

Plasma Sprayed coatings provide protection against corrosion, erosion and wear. Inconel- 718 is a metallic coating which has good wear and erosion resistance. This is plasma sprayed on to Al6061 substrate and then subjected to slurry erosive wear tests. It is observed that the slurry wear rates of Al6061 decreased on coating the substrate material with Inconel- 718.

关键词： Plasma spray Inconel- 718 Al6061 Erosion.