Micro/nanoscale structural, mechanical and tribological characterization of ZA-27/SiC nanocomposites

2019 ◽  
Vol 54 (16) ◽  
pp. 2113-2129
Author(s):  
Miroslav Babic ◽  
Blaza Stojanovic ◽  
Dragan Dzunic ◽  
Marko Pantic
Keyword(s):  
Matrix Material ◽  
Matrix Alloy ◽  
Density Level ◽  
Friction Behavior ◽  
Sic Nanoparticles ◽  
Mechanical And Tribological Properties ◽  
Wear And Friction ◽  
Nanoparticle Content ◽  
Tribological Characterization

The structural, mechanical and tribological properties of ZA-27/SiC nanocomposites were investigated at micro/nanoscale. The nanocomposites with different volume fractions of nano-sized SiC particles were produced using the compocasting technique. The microstructure of nanocomposites was characterized with formation of SiC nano agglomerates, which were relatively uniformly distributed. The increase in SiC content contributed to the uniformity of their distribution. Also, the phenomenon of particle segregation in the form of particle-rich clusters, as well as particle-porosity clusters, was identified. The density level of composites decreased with the increase of the SiC content. The porosity followed a reverse trend. The tendency for formation of local particle-porosity clusters was the highest in ZA-27/1% SiC nanocomposite, causing the highest level of porosity. Increasing percentage of SiC content was followed by the increase in micro/nanohardness of the composites. The results of micro/nanoscale tribotests revealed that the reinforcing with SiC nanoparticles significantly improved wear and friction behavior of ZA-27 matrix alloy. The rate of improvement increased with the increase of SiC nanoparticle content, load, and sliding speed. The highest degree of changes corresponded to the change of the SiC nanoparticle content from 0 to 1 wt%. The further decrease of wear with SiC content (from 1 to 5 wt%) was almost linear. The different tribological behavior of tested ZA-27 matrix and ZA-27/SiC nanocomposites was influenced by differences of intensity of adhesion resulted in transferred layers of matrix material onto worn surfaces of Al2O3 ball counterpart. The intensity of adhesion significantly decreased with the increase of SiC nanoparticle content.

scholarly journals Nano/micro-mechanical and tribological characterization of Ar, C, N, and Ne ion-implanted Si

2010 ◽  
Vol 25 (5) ◽  
pp. 880-889 ◽  
Author(s):  
Zhi-Hui Xu ◽  
Young-Bae Park ◽  
Xiaodong Li
Keyword(s):  
Mechanical Properties ◽  
Tribological Properties ◽  
Crystalline Silicon ◽  
Semiconductor Industry ◽  
Damage Mechanism ◽  
Mechanical And Tribological Properties ◽  
Tribological Characterization ◽  
The Relationship ◽  
Ion Implanted

Ion implantation has been widely used to improve the mechanical and tribological properties of single crystalline silicon, an essential material for the semiconductor industry. In this study, the effects of four different ion implantations, Ar, C, N, and Ne ions, on the mechanical and tribological properties of single crystal Si were investigated at both the nanoscale and the microscale. Nanoindentation and microindentation were used to measure the mechanical properties and fracture toughness of ion-implanted Si. Nano and micro scratch and wear tests were performed to study the tribological behaviors of different ion-implanted Si. The relationship between the mechanical properties and tribological behavior and the damage mechanism of scratch and wear were also discussed.

Titanium-Based Sintered Alloy with Improved Wear Resistance

2020 ◽  
Vol 896 ◽  
pp. 270-275
Author(s):  
Stefan Gheorghe ◽  
Cristina Ileana Pascu ◽  
Claudiu Nicolicescu
Keyword(s):  
Wear Resistance ◽  
Sintered Alloy ◽  
Wear Properties ◽  
Friction Behavior ◽  
Low Wear ◽  
Sintered Alloys ◽  
Tribological Characterization ◽  
Alumina Ball ◽  
Wear Tests

Titanium sintered alloys have a special use in the technique because they have multiple advantages. Titanium and its alloys are characterized by remarkable physic-chemical, mechanical and technological properties. However, there are several such properties that have a lower value, such as friction behavior. Titanium and its alloys are recognized as having low wear resistance. Titanium alloyed with certain elements, such as tin or graphite, can lead to alloys with improved wear properties, with the specification that graphite does not exceed 1%. The technology of manufacturing titanium-based alloys is specific to powder metallurgy, but it also has some originality by choosing special sintering cycles. The paper aims to present a tribological characterization of the sintered TiAl alloy; the method uses the disc of the alloy that has been researched in contact with an alumina ball. The paper presents a detailed analysis of the wear tests carried out for four types of specimens obtained by different methods.

Dry Sliding Wear Behavior of A356-ZrO2 Metal Matrix Composite

2015 ◽  
Vol 1125 ◽  
pp. 116-120
Author(s):  
Hamidreza Ghandvar ◽  
Saeed Farahany ◽  
Mohd Hasbullah Idris ◽  
Mohammadreza Daroonparvar
Keyword(s):  
Metal Matrix ◽  
Sliding Wear ◽  
Adhesive Wear ◽  
Wear Behavior ◽  
A356 Alloy ◽  
Matrix Alloy ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Friction Behavior ◽  
Wear And Friction

Dry sliding wear and friction behavior of cast A356 Al-Si alloy and composite containing 5wt. % ZrO2 particles were studied by means of a pins-on-disk apparatus over loads of 5N, 20N and a sliding speed of 0.628m/s. The experimental results showed that the composites exhibited a higher wear resistance in comparison to that of the unreinforced A356 alloy. The friction coefficient of tested materials increased with increasing applied load from 5 to 20 N. FESEM investigations revealed that the wear mechanism of the A356 matrix alloy changed from sever abrasive, adhesive wear into mild abrasion and adhesive wear with addition of 5wt. % ZrO2 reinforcement particles.

Influence of ZrO2 nano particles on the behavior of mechanical and tribological properties of the AA7075 composite

2020 ◽  
pp. 239779142098152
Author(s):  
MS Prashanth Reddy ◽  
HP Raju ◽  
Nagaraj R Banapurmath ◽  
Vinod Kumar V Meti
Keyword(s):  
Matrix Material ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Matrix Alloy ◽  
Stir Casting ◽  
Nano Particles ◽  
Test Results ◽  
Casting Technique ◽  
Mechanical And Tribological Properties ◽  
Base Matrix

A well-known AA7075 alloy used for most of the structural, aerospace, and automobile applications due to its excellent properties such as high strength, corrosion-resistant, and low density. To encourage industrialists, the physical and mechanical properties of the composite has to improve by reinforcing hard ceramic particles. In this investigation varying wt.% of hard ZrO2 (zirconium dioxide) particles (0.75, 1, 1.25, 1.5, 1.75, and 2 wt.%) are reinforced in AA7075 matrix alloy to form a composite. Motorized stir casting technique induced to distribute reinforcement particles homogeneously. The SEM micrographs reveal that uniform distribution of ZrO2 particles can be achieved after inducing motorized stir casting technique into the molten composite. The experimental test results revealed that the addition of ZrO2 particles enhanced the hardness and tensile strength of the AA7075/ZrO2 composite as compared to base matrix material. Among all composites, AA7075/1.5ZrO2 show higher hardness and strength.

Tribological Characterization of Electroless Ni–B Coatings Formed on Commercial Purity Magnesium

2017 ◽  
Vol 139 (5) ◽  
Author(s):  
E. Correa ◽  
J. F. Mejía ◽  
J. G. Castaño ◽  
F. Echeverría ◽  
M. A. Gómez
Keyword(s):  
Sliding Wear ◽  
Parametric Optimization ◽  
Commercial Purity ◽  
Electroless Coating ◽  
Friction Testing ◽  
Wear And Friction ◽  
Electroless Coatings ◽  
Tribological Characterization ◽  
Electroless Ni

Ni–B coatings have been deposited directly on commercial purity magnesium and evaluated by means of sliding wear and friction testing. The nickel and boron are distributed throughout the whole thickness of the coating. Parametric optimization has been carried out using the design of experiment based on Taguchi analysis. The friction coefficients of the coatings vary between 0.01 and 0.3, depending on the evaluated conditions. The lowest wear rate of the coating was 0.19 × 10−5 mm3 N−1 m−1. Wear and friction coefficient maps of Ni–B electroless coatings formed on magnesium surfaces are reported. Nanoparticles present in the lubricating fluid act as a third wear body increasing the wear of the electroless coating

scholarly journals Mechanical and Tribological Characterization of a Dental Ceromer

2020 ◽  
Vol 11 (1) ◽  
pp. 11 ◽  
Author(s):  
Mariana Santos ◽  
Ana Sofia Coelho ◽  
Anabela Baptista Paula ◽  
Carlos Miguel Marto ◽  
Inês Amaro ◽  
...  
Keyword(s):  
Coefficient Of Friction ◽  
Test Group ◽  
Scratch Test ◽  
Composite Resins ◽  
Control Group ◽  
Posterior Teeth ◽  
Mechanical And Tribological Properties ◽  
The Coefficient Of Friction ◽  
Tribological Characterization

Background: Indirect restorations using composites with ceramic fillings can be an alternative to ceramic veneering and direct composite restorations for the treatment of posterior teeth. The aim of this study was the evaluation of the mechanical and tribological properties of a ceromer. Materials and Methods: Sixty specimens were produced and divided into two groups: one control group not submitted to thermocycling (n = 20) and one test group submitted to 5000 cycles of thermocycling (n = 40). The studied parameters were microhardness, surface roughness and the coefficient of friction (scratch test). Results: The ceromer exhibits a reduction of polymerization shrinkage, higher wear, and fracture resistance than the composite resins. The studied ceromer presented good mechanical properties, even after being submitted to thermocycling. Roughness was the property most affected, increasing 25.8%, microhardness decreased by 10.5% and the coefficient of friction increased by 4.2%. Conclusions: In certain situations, ceromers can be an alternative to composite resins and ceramics, providing an aesthetic, conservative and longevity option.

Tribological Characterization of Electroless Nickel-Boron Coatings

2011 ◽  
Vol 409 ◽  
pp. 808-813 ◽  
Author(s):  
Véronique Vitry ◽  
Abdoul Fatah Kanta ◽  
Adeline Sens ◽  
Fabienne Delaunois
Keyword(s):  
Heat Treatment ◽  
Industrial Process ◽  
Electroless Nickel ◽  
Reduced Pressure ◽  
Environment Friendly ◽  
Mechanical And Tribological Properties ◽  
Tribological Characterization ◽  
Scratch Tests ◽  
Steel Substrates

Nanocrystalline electroless nickel-boron deposits (on steel substrates) were submitted to heat treatment under non-reactive atmosphere or to nitriding to enhance their properties. Two different nitriding processes were used on the samples: one classical industrial process under an ammonia-based atmosphere and a novel, environment friendly treatment under a reduced pressure, nitrogen-based, atmosphere. The mechanical and tribological properties of the as-deposited and treated samples were investigated by various methods including nanoindentation and scratch tests. Their structural properties were also studied. The hardness of the deposits increased from 900 to 1250 hv100due to optimal crystallization after the heat treatment and was further enhanced up to 1600 hv100after nitriding. The scratch tests resistance of the coatings was good in both as-deposited conditions as well as after post treatment.

Tribological characterization of Fe-Cu-Sn alloy with graphite as solid lubricant

2018 ◽  
Vol 70 (2) ◽  
pp. 393-400 ◽  
Author(s):  
Shuhaib Mushtaq ◽  
Mohd Farooq Wani
Keyword(s):  
Abrasive Wear ◽  
Tribological Properties ◽  
Solid Lubricant ◽  
Matrix Material ◽  
Content Type ◽  
Dry Conditions ◽  
Tribological Characterization ◽  
Sliding Distance ◽  
Ball On Disc

Purpose This paper aims to investigate the effect of varying Wt.% (0-3 per cent) of graphite as a solid lubricant on the tribological properties of Fe-Cu-Sn alloy. Design/methodology/approach Powder metallurgy technique is used for the fabrication of Fe-Cu-Sn alloy with varying Wt.% of graphite. The tribological tests were conducted on a ball-on-disc universal tribometer under different testing conditions. Findings The friction coefficient decreases with sliding distance and load, but the wear rate increases with the increase in load. The G3 composition showed the best tribological properties under dry conditions. The wear mechanism of G0 composition shows adhesive wear and abrasive wear, while G1, G2 and G3 compositions show mildly abrasive wear. Originality/value This paper reported a new, cheap and wear-resistant self-lubricating Fe matrix material for gears and bearings.

Comprehensive Mechanical and Tribological Characterization of Ultra-Thin-Films

2007 ◽  
Vol 1049 ◽  
Author(s):  
Norm Gitis ◽  
Michael Vinogradov ◽  
Ilja Hermann ◽  
Suresh Kuiry
Keyword(s):  
Thin Films ◽  
Young’S Modulus ◽  
Adhesion Strength ◽  
Tribological Properties ◽  
Comprehensive Evaluation ◽  
Young's Modulus ◽  
Mechanical And Tribological Properties ◽  
Comparative Results ◽  
Tribological Characterization

AbstractBased on recent studies, mechanical and tribological properties such as hardness, Young's modulus, friction, and scratch adhesion strength on various coatings and ultra-thin films are reported. These results were obtained using a Universal Nano+Micro Tester UNMT-1, suitably designed for comprehensive evaluation of mechanical and tribological properties of bulk materials, coatings and thin films. Results indicate that a substrate effect for ultra-thin films is substantial when using conventional static nanoindentation technique, while negligible with an advanced dynamic nano-indentation. Comparative results of hardness and Young's modulus obtained from various techniques are presented. Also, a means to evaluate friction and adhesion strength of thin films is highlighted, using DLC specimens as an example.

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