Friction and wear behavior of a PMMA-SiO2 coating on hardened steel

2014 ◽  
Vol 1613 ◽  
pp. 109-114
Author(s):  
Luis E. Torres-Parga ◽  
Carolina Hernández-Navarro ◽  
Karla J. Moreno-Bello ◽  
J.S. García-Miranda ◽  
Luis D. Aguilera-Camacho ◽  
...  
Keyword(s):  
Wear Behavior ◽  
Sol Gel ◽  
Dip Coating ◽  
Hardened Steel ◽  
Protective Film ◽  
Friction Behavior ◽  
A Value ◽  
Wear And Friction ◽  
Dry Conditions ◽  
Steel Substrates

ABSTRACTSol-gel coatings show an excellent chemical stability, oxidation control and enhanced corrosion resistance for metal substrates. An organic-inorganic hybrid consisting of poly (methyl methacrylate) (PMMA) and silica (SiO2) was successfully synthesized in the form of solution, by using 3-(trimethoxysilyl) propyl methacrylate (TMSPM) as a coupling agent and cohydrolyzed with tetraethyl orthosilicate (TEOS) to afford chemical bondings to the forming silica networks by a sol-gel method. The as-synthesized hybrid material was subsequently characterized by Fourier Transformation infrared (FTIR) spectroscopy. PMMA-SiO2 was applied as a protective film on hardness steel substrates by dip-coating. The thickness of the coating was 25 µm, while the roughness Ra = 0.6 µm. The wear and friction behavior of the coating on hardened steel (HS) was evaluated by a ball-on-disk test in dry conditions with a AISI steel ball as counterface applying 2, 4, 6, 8 and 10 N normal loads. Friction coefficient values (µk) were in the range of 0.76 to 0.99, whereas the lowest wear rate (k) was observed at 6N with a value of 1.30x10-4 (mm3(Nm)-1).

scholarly journals Sol–Gel Synthesis and Characterization of Coatings of Mg-Al Layered Double Hydroxides

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3738 ◽  
Author(s):  
A. Smalenskaite ◽  
M. M. Kaba ◽  
I. Grigoraviciute-Puroniene ◽  
L. Mikoliunaite ◽  
A. Zarkov ◽  
...  
Keyword(s):  
Thin Films ◽  
Layered Double Hydroxides ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Dip Coating ◽  
Dipping Process ◽  
Synthetic Approaches ◽  
Sol Gel Synthesis ◽  
Double Hydroxides ◽  
Steel Substrates

In this study, new synthetic approaches for the preparation of thin films of Mg-Al layered double hydroxides (LDHs) have been developed. The LDHs were fabricated by reconstruction of mixed-metal oxides (MMOs) in deionized water. The MMOs were obtained by calcination of the precursor gels. Thin films of sol–gel-derived Mg-Al LDHs were deposited on silicon and stainless-steel substrates using the dip-coating technique by a single dipping process, and the deposited film was dried before the new layer was added. Each layer in the preparation of the Mg-Al LDH multilayers was separately annealed at 70 °C or 300 °C in air. Fabricated Mg-Al LDH coatings were characterized by X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), and atomic force microscopy (AFM). It was discovered that the diffraction lines of Mg3Al LDH thin films are sharper and more intensive in the sample obtained on the silicon substrate, confirming a higher crystallinity of synthesized Mg3Al LDH. However, in both cases the single-phase crystalline Mg-Al LDHs have formed. To enhance the sol–gel processing, the viscosity of the precursor gel was increased by adding polyvinyl alcohol (PVA) solution. The LDH coatings could be used to protect different substrates from corrosion, as catalyst supports, and as drug-delivery systems in medicine.

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.

Microstructure and Friction Behavior of AISI 52100 and D2 Steels Subjected to Ultrasonic Nanocrystalline Surface Modification (UNSM) Technique at a High Temperature

2016 ◽  
Vol 879 ◽  
pp. 164-168
Author(s):  
Auezhan Amanov ◽  
Jun Hyong Kim ◽  
Young Sik Pyun
Keyword(s):  
Surface Modification ◽  
High Temperature ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Bearing Steel ◽  
Friction Behavior ◽  
Friction And Wear Behavior ◽  
Aisi 52100 ◽  
Before And After ◽  
Dry Conditions

In this study, two different AISI 52100 bearing and D2 tool steels were subjected to ultrasonic nanocrystalline surface modification (UNSM) technique at ambient and high temperature of 500 °C. The objective of this study is to characterize the microstructure and to investigate the effectiveness of UNSM technique on the friction and wear behavior of those steels. The friction and wear behavior of the specimens against AISI52100 bearing steel ball with a diameter of 10 mm was carried out using a micro-tribo tester under dry conditions. The hardness with respect to depth from the top surface was measured using a microhardness. The change in the microstructure of the specimens before and after UNSM treatment was characterized by scanning electron microscopy (SEM). The findings from this preliminary study are expected to be implemented to the bearings and tools to increase the efficiency and performance of the components.

Corrosion Behavior of Hybrid Organic-Inorganic Coated Steel in Simulated Concrete Pore Solution

2015 ◽  
Vol 227 ◽  
pp. 199-202
Author(s):  
María Criado ◽  
Isabele Sobrados ◽  
José Maria Bastidas ◽  
Jesús Sanz
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pore Solution ◽  
Sol Gel ◽  
Dip Coating ◽  
Coated Steel ◽  
Hybrid Films ◽  
Molar Ratios ◽  
Steel Substrates ◽  
Scanning Electron

This work compares the anticorrosion features of polysiloxane hybrid films deposited on carbon steel substrates by dip-coating. To assess the influence of the components, sol-gel coatings were prepared from condensation and polymerization of TEOS and MPTS, TEOS and MTES, TMOS and MPTS or TMOS and MTES in three molar ratios. The corrosion resistance of the coatings was evaluated by means of polarization curves and the coatings’ thicknesses and compositions were analyzed by a field emission-scanning electron microscopy.

scholarly journals A Comprehensive Study about the Role of Crosslink Density on the Tribological Behavior of DLC Coated Rubber

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5460
Author(s):  
Suleyman Bayrak ◽  
Dominik Paulkowski ◽  
Klaus Werner Stöckelhuber ◽  
Benjamin Staar ◽  
Bernd Mayer
Keyword(s):  
Crosslink Density ◽  
Wear Behavior ◽  
Substrate Material ◽  
Butadiene Rubber ◽  
Friction Behavior ◽  
Functional Layer ◽  
Wear And Friction ◽  
Substrate Properties ◽  
The Impact

The friction and wear behavior of coated rubber components is strongly dependent on the substrate properties. This work deals with the impact of the crosslink density, i.e., the hardness of the rubber substrate on the tribological performance of uncoated and coated rubber. The hardness of nitrile butadiene rubber (NBR) is varied altering the sulfur content. Both the uncoated and coated rubber samples are characterized in terms of surface and mechanical properties. Tribological tests comprise the examination of the macroscopic contact area and the temperature in the contact zone. It was found that the functional layer enhances the wear resistance significantly. Apparently, the wear and friction behavior of the coated rubber correlates with the hardness and the bulk properties of the substrate material.

scholarly journals Sol-gel derived coatings for the conservation of steel

2015 ◽  
Vol 9 (2) ◽  
pp. 81-89 ◽  
Author(s):  
Erika Kiele ◽  
Jurate Senvaitiene ◽  
Asta Grigucevicienė ◽  
Rimantas Ramanauskas ◽  
Rimantas Raudonis ◽  
...  
Keyword(s):  
Sol Gel ◽  
Dip Coating ◽  
Processing Route ◽  
Force Microscopy ◽  
Angle Measurements ◽  
Before And After ◽  
Silica Sols ◽  
Commercial Polymers ◽  
Dip Coating Technique ◽  
Steel Substrates

In this paper, sol-gel processing route has been applied and investigated for the conservation of steel. Nanosilica coatings on steel surface have been prepared using tetraethylorthosilicate (TEOS) as a starting material. The methyl-modified silica sols were obtained by mixing of 3mas.% SiO2 sol solution with hexamethyldisilozane (HMDS). The surface of steel was coated by dip-coating technique. In order to compare the characteristics of coatings, the steel substrates were also coated with commercial polymers Paraloid B67, Cosmolloid H80 and Antik Patina. The surface morphology changes of the uncoated and coated specimens before and after photochemical ageing were investigated by scanning electron microscopy and atomic force microscopy. The structure of the prepared coatings was also investigated by FTIR spectroscopy. The hydrophobicity of surfaces was evaluated by contact angle measurements. Potentiodynamic measurements were obtained in order to compare corrosion parameters of the coatings.

Effect of crystal size on the tribological behavior of manganese phosphate coatings under lubricated sliding

2017 ◽  
Vol 232 (10) ◽  
pp. 1285-1292
Author(s):  
Nicolás S Fochesatto ◽  
Camila Müller ◽  
Nicolás A Zabala ◽  
Pablo A Castro ◽  
Walter R Tuckart
Keyword(s):  
Crystal Size ◽  
Wear Behavior ◽  
Activator Concentration ◽  
Friction Behavior ◽  
Manganese Phosphate ◽  
Phosphate Coatings ◽  
Wear And Friction ◽  
Optical Profilometer ◽  
Sliding Distance ◽  
Wear Tests

In this study, the wear and friction behavior of manganese phosphate coatings with different crystal sizes were investigated. Crystal size was controlled modifying the chemical composition of the phosphating bath, particularly the concentration of the activator which modifies the number of nuclei for crystal growth. Activator concentration range used for this work varied from 0 to 0.7 g/L, and crystal size was measured using image analysis software on scanning electron microscopy photographs. Available volume for lubricant retention was determined measuring the phosphated surface with a 3D optical profilometer. At the same time, lubricated wear tests were carried out using a ring-on-block configuration at low speeds (23 mm/s) and high loads (14,500 N). Wear behavior was determined as the sliding distance to failure, which was noticed through signs of removal of the phosphate along with the increase of coefficient of friction. It was found that there is a competition between the availability of volume to hold the lubricant, which increases with the crystal size, and the surface coverage, which diminishes as the crystal size grows. Optimal results were obtained for an activator concentration of 0.3 g/L, which meant an average crystal size of 16 µm.

Abrasive wear behavior of Al-TiB2 and Al-TiB2-nano-graphite metal matrix composites

2021 ◽  
pp. 146442072199158
Author(s):  
Suswagata Poria ◽  
Goutam Sutradhar ◽  
Prasanta Sahoo
Keyword(s):  
Abrasive Wear ◽  
Fixed Effects ◽  
Wear Behavior ◽  
Base Alloy ◽  
Operating Conditions ◽  
Grit Size ◽  
Friction Behavior ◽  
Uniform Dispersion ◽  
Wear And Friction ◽  
Abrasive Wear Behavior

This paper deals with abrasive wear behavior of two different composite materials namely Al-TiB2 and Al-TiB2-nano-graphite. At the time of fabrication, ultrasonic vibration is used along with mechanical stirrer to obtain uniform dispersion of micro (TiB2) and nano (graphite) reinforcement phase. Uniform dispersion is confirmed through SEM images of cast composites. Micro-hardness values are obtained for composites and base alloy. Wear tests under two-body abrasion are performed by a tribological test apparatus where composite pins are being rubbed against a disc holding different grades of SiC abrasives: 240 grit, 320 grit and 400 grit. Operating load is varied between 10N and 30N while sliding speed and duration of sliding are kept fixed. Effects of load, reinforcing phase content and abrasive grit size on abrasive wear and friction behavior have been evaluated. Al-TiB2 composites demonstrate higher wear resistance and better friction behavior in comparison with base alloy under all operating conditions. Addition of nano-graphite phase contributes in achieving better abrasive wear and friction performance of Al-TiB2 composites. With increase in grit size, wear reduces for composites and base alloy while wear increases with load. Worn surfaces of samples and emery papers are studied using SEM micrographs and EDX maps. Wear debris at different operating conditions are studied also using SEM and EDX. Operative wear mechanisms are identified from the experimental results.

The Unlubricated Sliding Wear Behavior of a Wrought Cobalt-Chromium Alloy Against Monolithic Ceramic Counterfaces

1989 ◽  
Vol 111 (4) ◽  
pp. 668-674 ◽  
Author(s):  
C. V. Cooper ◽  
C. L. Rollend ◽  
D. H. Krouse
Keyword(s):  
Sliding Wear ◽  
Wear Behavior ◽  
Degradation Mechanism ◽  
Chromium Alloy ◽  
Cobalt Chromium ◽  
Material Degradation ◽  
Friction Behavior ◽  
Solution Treated ◽  
Wear And Friction ◽  
Cobalt Chromium Alloy

The unlubricated sliding wear and friction behavior of a wrought cobalt-chromium alloy against sintered Al2O3, ZrO2-toughened Al2O3, MgO-partially-stabilized ZrO2, and hot-pressed Si3N4 ceramic counterfaces has been investigated. Both untreated (baseline) and surface-borided conditions of alloy 6B disks were investigated. The dominant wear and/or material degradation mechanism for surface-borided alloy 6B was a combination of abrasion and plastic deformation; in addition, adhesive transfer of the cobalt alloy to monolithic Al2O3 counterfaces was a significant wear mechanism for the as-solution-treated alloy 6B disk. For the partially stabilized ZrO2 counterface, the degradation mechanism involved thermal and/or mechanical fatigue processes, resulting in the formation of microcracks in the 6B disks transverse to the sliding direction. This microcracking has been ascribed to the low thermal conductivity of the partially stabilized ZrO2 and the activation of a martensitic, fcc-to-hcp transition with each passing of the ZrO2 ball. For borided alloy 6B against hot-pressed Si3N4, a transition from negligible to severe wear was noted with increasing sliding speeds.

Investigation of Structural and Mechanical Properties of UV and Microwave-Irradiated Al2O3 / ZrO2 Multilayers by Sol-Gel Coating

2003 ◽  
Vol 795 ◽  
Author(s):  
A. R. Phani ◽  
H. Haefke
Keyword(s):  
Elastic Modulus ◽  
Solid Phase ◽  
Sol Gel ◽  
Dip Coating ◽  
X Ray ◽  
Strength Failure ◽  
Different Temperatures ◽  
Indentation Tests ◽  
Lower Temperature ◽  
Steel Substrates

ABSTRACTThin film multilayers of Al2O3 / ZrO2 have been deposited on quartz and AISI 440C steel substrates at room temperature by sol-gel dip coating technique followed by annealing at different temperatures ranging from 200°C to 800°C for 5h. Prior to annealing the deposited films have been exposed 10 min to ultraviolet radiation (248 nm wavelength) and microwave (2.45 MHz at 800 W power) respectively. Unlike conventional annealing methods, microwave heating is generally quite faster, simpler, and very energy efficient. The lower temperature and shorter time with microwave irradiation might be ascribed to the activating and facilitating effect of microwave on solid phase diffusion. X-ray diffraction (XRD) and scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analyser techniques have been employed to characterize structural, morphological and elemental composition of the thin films. Adhesion strength failure measurements on films have shown critical loads up to 35 N. Nanohardness indentation tests of the films exposed to microwave have shown hardness of 10 GPa with elastic modulus of 85 GPa compared to the annealed films hardness of 4.5 GPa with elastic modulus 57 GPa.

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