scholarly journals Tribological Properties of Copper-Based Composites with Lubricating Phase Particles

2014 ◽  
Vol 59 (2) ◽  
pp. 615-620 ◽  
Author(s):  
B. Juszczyk ◽  
J. Kulasa ◽  
S. Malara ◽  
M. Czepelak ◽  
W. Malec ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Tribological Properties ◽  
Copper Alloys ◽  
Metallic Matrix ◽  
Stir Casting ◽  
Sintering Process ◽  
Molybdenum Disulphide ◽  
Metal Bath ◽  
Tungsten Disulphide ◽  
Liquid Metal Bath

Abstract The results of research into influence of chemical composition on structure and tribological properties of copper-based composites intended for slide bearings are presented in this paper. The study was focused on copper alloys with lubricating phase particles in form of graphite, tungsten disulphide (WS2), molybdenum disulphide (MoS2) and glassy carbon. The metallic matrix of composite materials was composed of alloys from Cu-Sn-Zn system. The mass content of lubricating phase particles was from 5 to 20%. The process of production of subject materials included the processes conducted with full or partial contribution of liquid phase and it was conducted by two methods. Both the method of classic powder metallurgy and stir casting method were used for the production of composites. Lubricating phase particles heated to the temperature of 200°C were introduced to liquid metal bath and then the process of stirring and casting to moulds was performed. In case of production of composites by powder metallurgy, the process included mixing of bronze powders and lubricating phase particles, and then their consolidation. Sintering process was conducted in temperature between 750-800°C. The produced materials were tested in terms of microstructure and tribological properties with the CSM Instruments tribometer.

Microstructure and Tribological Properties of the Copper Matrix Composite Materials Containing Lubricating Phase Particles

2014 ◽  
Vol 59 (1) ◽  
pp. 365-369 ◽  
Author(s):  
B. Juszczyk ◽  
J. Kulasa ◽  
W. Malec ◽  
Sz. Malara ◽  
M. Czepelak ◽  
...  
Keyword(s):  
Composite Materials ◽  
Powder Metallurgy ◽  
Tribological Properties ◽  
Glassy Carbon ◽  
Copper Alloys ◽  
Metallic Matrix ◽  
Copper Matrix ◽  
Stir Casting ◽  
Mechanical Stirring ◽  
Carbon Particles

Abstract The paper presents results of the studies into influence of individual particles of lubricating phase on microstructure and tribological properties of copper based composite materials for slide bearings. The studied material was composed of copper alloys with lubricating phase particles, e.g. in a form of graphite and glassy carbon. The metallic matrix of composite materials consisted of Cu-Sn type alloys. Production of the examined materials included processes with complete or partial participation of liquid phase and was conducted in two ways. In production of composites both classical powder metallurgy technology was applied and a method of melting with simultaneous mechanical stirring in liquid state (stir casting). Particles of lubricating phases were heated up to the temperature of 200°C and introduced into a liquid metal and then stirring process at constant rate of 1500 rpm rotational speed was applied. To improve wettability of graphite and glassy carbon particles titanium was introduced into the metallic matrix. In production of the composites by powder metallurgy methods the process consisted of mixing of bronze powders and particles of non-metallic phases and then their consolidation. Both quantitative and qualitative structure analysis of the produced composites was performed. Also through evaluation of tribological properties (friction coefficient, wear) with CSM Instruments high temperature tribometer THT was conducted.

Effect of epoxidation and nanoparticle addition on the rheological and tribological properties of canola oil

2021 ◽  
pp. 135065012110161
Author(s):  
Gourav Gupta ◽  
Mir Irfan Ul Haq ◽  
Ankush Raina ◽  
Wani K Shafi
Keyword(s):  
Aluminium Alloy ◽  
Rheological Properties ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Canola Oil ◽  
Molybdenum Disulphide ◽  
Tungsten Disulphide ◽  
Pin On Disc ◽  
Lubricating Properties ◽  
And Tungsten

The paper investigates the lubricating properties of epoxidised canola oil. The epoxidation is carried out to decrease the unsaturated bonds present in canola oil. Further, metal dichalcogenide nanoparticles (molybdenum disulphide and tungsten disulphide) are mixed in modified canola oil and their effect on rheological and tribological properties is evaluated. The tribological investigation is carried out on a pin-on-disc tribometer with aluminium alloy and steel as tribopairs. The rheological properties of nanofluids have been studied. It is observed that the modification of the canola oil improves the tribological properties of virgin canola oil. The addition of nanoparticles into the modified canola increases the viscosity of the oil with a 1 wt% concentration of nanoparticles. Further, enhancement in the tribological properties is observed with the addition of nanoparticles. A maximum of 54.6% and 30% decrease in coefficient of friction is observed with the use of tungsten disulphide and molybdenum disulphide nanoparticles, respectively.

Investigating the corrosion resistance of spark plasma sintered copper with ruthenium powder

2018 ◽  
Vol 65 (6) ◽  
pp. 594-604
Author(s):  
Winnie Zaba ◽  
Josias Willem Van der Merwe
Keyword(s):  
Corrosion Resistance ◽  
Powder Metallurgy ◽  
Copper Alloy ◽  
Design Methodology ◽  
Copper Alloys ◽  
Sintering Process ◽  
Content Type ◽  
Plasma Sintering ◽  
Sintered Copper ◽  
Spark Plasma

Purpose The corrosion resistance of copper and copper-ruthenium alloys produced by powder metallurgy (spark plasma sintering process) and exposed in 2M sulphuric acid at 45°C and 65°C was investigated using scanning electron microscopy and potentiodynamic polarisation technique. Design/methodology/approach The small additions of ruthenium (0.5, 1 and 2 Wt.%) to the copper resulted in improved corrosion resistance of the copper alloy by up to 90 per cent when compared to casted copper. Findings All the sintered copper and copper alloys proved to have increased the corrosion resistance in all the temperatures. Originality/value Powder metallurgy was used in achieving these improvements.

CERROBASE Alloy

Alloy Digest ◽  
1979 ◽  
Vol 28 (4) ◽  
Keyword(s):  
Liquid Metal ◽  
Eutectic Alloy ◽  
Slow Growth ◽  
Heat Treating ◽  
Metal Bath ◽  
Drop Hammer ◽  
Industrial Material ◽  
Liquid Metal Bath ◽  
Metal Products ◽  
Bismuth Lead

Abstract CERROBASE Alloy is a bismuth-lead eutectic alloy that melts at 255 F (124 C). It is characterized by initial shrinkage followed by slow growth. Its low melting temperature and/or growth-shrinkage characteristics make it a useful industrial material. Among many applications, it is used for (1) anchoring inserts in wood, metal or plastics, (2) drop-hammer dies, (3) duplicate patterns in pottery and foundry, and (4) liquid metal bath for heat treating. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on casting, forming, heat treating, and machining. Filing Code: Bi-11. Producer or source: Cerro Metal Products.

Mathematical Model of the Sintering Process of Iron-Copper Bearings

2007 ◽  
Vol 23 ◽  
pp. 119-122
Author(s):  
Cristina Teișanu ◽  
Stefan Gheorghe ◽  
Ion Ciupitu
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Mathematical Model ◽  
Regression Analysis ◽  
Function Optimization ◽  
Chemical Compositions ◽  
Sintering Process ◽  
Molybdenum Disulphide ◽  
Iron Copper ◽  
Antifriction Properties

The most important features of the self-lubricating bearings are the antifriction properties such as friction coefficient and wear resistence and some mechanical properties such as hardness, tensile strength and radial crushing strength. In order to improve these properties new antifriction materials based on iron-copper powders with several additional components (tin, lead and molybdenum disulphide) have been developed by PM techniques. To find the optimal relationship between chemical compositions, antifriction and mechanical properties, in this paper a mathematical model of the sintering process is developed, which highlighted the accordance of the model with data by regression analysis. For the statistical processing of the experimental data the VH5 hardness values of the studied materials were considered. The development of mathematical model includes the enunciation of the model, the establishment of the performance function (optimization) and the establishment of the model equations and verifying. The accordance of the model with experimental data has been highlighted by regression analysis

Performance Evaluation of Silicon-Transition Metal Dichalcogenides Heterostructure Based Steep Subthreshold Slope-Field Effect Transistor Using Non-Equilibrium Green’s Function

2020 ◽  
Vol 18 (6) ◽  
pp. 468-476
Author(s):  
Prateek Kumar ◽  
Maneesha Gupta ◽  
Naveen Kumar ◽  
Marlon D. Cruz ◽  
Hemant Singh ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Field Effect ◽  
Field Effect Transistor ◽  
Metal Oxide Semiconductor ◽  
Oxide Semiconductor ◽  
Molybdenum Disulphide ◽  
Short Channel ◽  
Tungsten Disulphide ◽  
Channel Effects ◽  
Effect Transistor

With technology invading nanometer regime performance of the Metal-Oxide-semiconductor Field Effect Transistor is largely hampered by short channel effects. Most of the simulation tools available do not include short channel effects and quantum effects in the analysis which raises doubt on their authenticity. Although researchers have tried to provide an alternative in the form of tunnel field-effect transistors, junction-less transistors, etc. but they all suffer from their own set of problems. Therefore, Metal-Oxide-Semiconductor Field-Effect Transistor remains the backbone of the VLSI industry. This work is dedicated to the design and study of the novel tub-type Metal-Oxide-Semiconductor Field-Effect Transistor. For simulation Non-Equilibrium Green’s Function is used as the primary model of simulation. The device is analyzed under different physical variations like work function, permittivity, and interface trap charge. This work uses Silicon-Molybdenum Disulphide heterojunction and Silicon-Tungsten Disulphide heterojunction as channel material. Results for both the heterojunctions are compared. It was analyzed that Silicon-Molybdenum Disulphide heterojunction provides better linearity and Silicon-Tungsten Disulphide heterojunction provides better switching speed than conventional Metal-Oxide-Semiconductor Field-Effect Transistor.

Liquid-Metal-Bath Stress-Strain Apparatus

1965 ◽  
Vol 38 (4) ◽  
pp. 782-790
Author(s):  
G. L. Hall ◽  
J. D. Rigby ◽  
J. W. Liska
Keyword(s):  
Heat Transfer ◽  
Atmospheric Oxygen ◽  
Uniform Temperature ◽  
Metal Bath ◽  
Stress Strain ◽  
Temperature Resistance ◽  
Rubber Compounds ◽  
Liquid Metal Bath ◽  
Base Polymer ◽  
Heating Medium

Abstract A simple, reliable apparatus for measuring stress-strain properties of vulcanizates at temperatures up to at least 800° F has been developed. The heating medium is a molten metal bath which provides uniform temperature distribution and rapid heat transfer while excluding atmospheric oxygen. Ultimate tensile strengths are in excellent agreement with those obtained in conventional air-oven tests. Stress relaxation tests show the effects of excluding atmospheric oxygen from the specimens. Somewhat higher ultimate elongations are obtained in the liquid-bath than in air-oven apparatus, for which possible reasons are suggested. Results on vulcanizates of heat-resistant polymers demonstrate that retention of physical properties at 500° F or 600° F cannot be safely predicted from data obtained at 400° F. The curing system, as well as the base polymer, is very important to high temperature resistance. In both Diene and butyl rubber compounds, for example, resin cures were superior in this respect to more conventional curing systems.

scholarly journals Preparation and Microstructure Characteristics of Aluminium 6061 Alloy Based Metal Matrix Composite

2019 ◽  
Vol 9 (2S4) ◽  
pp. 465-468
Keyword(s):  
Metallic Matrix ◽  
Weight Fraction ◽  
Stir Casting ◽  
Scientific Discipline ◽  
Carbide Powder ◽  
Matrix Composites ◽  
Metallic Matrix Composites ◽  
Casting Technique ◽  
Special Weight

The role of engineering substances within the improvement of cutting-edge era like metallic Matrix Composites (MMCs) have evoked a eager hobby nowadays for capacity programs in aerospace and car industries as a result of their advanced power. Aluminium (6061) and Boron Carbide (Powder) is chosen for reinforcement material and matrix respectively. Al–B4C composites containing special weight probabilities 3.5 %, 7.0% and 10.5% of B4C have been fabricated by way of stir casting Technique. Experiments are conducted with the aid of various weight fraction of B4C (3.5%, 7.0% and 10.5%), at the same time as maintaining all other parameters regular. The compositions of their small structural options are determined through scientific discipline magnifier..

scholarly journals Investigation of graphite effect on the mechanical and tribological properties of Al 7075-SiC-graphite hybrid metal matrix composites

2020 ◽  
Vol 37 (1−2) ◽  
Author(s):  
SRIDHAR ATLA ◽  
Prasanna Lakshmi Kaujala
Keyword(s):  
Silicon Carbide ◽  
Powder Metallurgy ◽  
Tribological Properties ◽  
Metal Matrix ◽  
Ceramic Composites ◽  
Wear Behaviour ◽  
Wear Loss ◽  
Mechanical And Tribological Properties ◽  
Al 7075 ◽  
Pin On Disc

The aluminium metal matrix composite reinforced with ceramic material of Silicon carbide (SiC) has good mechanical properties. However, aluminium based ceramic composites require improvements in their lubrication and tribological properties. In this study an attempt is made in the development of a new material through powder metallurgy technique by the addition of Graphite, which acts as a solid lubricant. This work investigated the influence of graphite on the wear behaviour of Al 7075/SiC /X wt.% graphite(X=0, 5 and 10) hybrid composite. The investigation reveals the effectiveness of incorporation of graphite in the composite for gaining wear reduction. The Al 7075 (aluminium alloy 7075) reinforced with SiC –graphite were investigated. The composites were fabricated using powder metallurgy route. The microstructures, material combination, wear and friction properties were analysed by scanning electron microscopy, XRD, and pin-on-disc wear tester. The newly developed aluminium composite has significant improvements in tribological properties with a combination of 5% Silicon carbide (SiC) and 5% Graphite. The test reveals that sliding distance of 1000 m and sliding speed of 1.5 m/s with applied load of 5 N result in minimum wear loss of 0.01062g and coefficient of friction as 0.1278.

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