scholarly journals Experimental—FEM Study on Effect of Tribological Load Conditions on Wear Resistance of Three-Component High-Strength Solid-Lubricant PI-Based Composites

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2837
Author(s):  
Sergey V. Panin ◽  
Jiangkun Luo ◽  
Dmitry G. Buslovich ◽  
Vladislav O. Alexenko ◽  
Lyudmila A. Kornienko ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Wear Rate ◽  
Solid Lubricant ◽  
Film Formation ◽  
High Strength ◽  
Solid Lubrication ◽  
High Wear Resistance ◽  
Large Area ◽  
Tribological Tests ◽  
Mechanical And Tribological Properties

The structure, mechanical and tribological properties of the polyimide-based composites reinforced with chopped carbon fibers (CCF) and loaded with solid-lubricant commercially available fillers of various natures were investigated. The metal- and ceramic counterparts were employed for tribological testing. Micron sized powders of PTFE, colloidal graphite and molybdenum disulfide were used for solid lubrication. It was shown that elastic modulus was enhanced by up to 2.5 times, while ultimate tensile strength was increased by up 1.5 times. The scheme and tribological loading conditions exerted the great effect on wear resistance of the composites. In the tribological tests by the ‘pin-on-disk’ scheme, wear rate decreased down to ~290 times for the metal-polymer tribological contact and to ~285 times for the ceramic-polymer one (compared to those for neat PI). In the tribological tests against the rougher counterpart (Ra~0.2 μm, the ‘block-on-ring’ scheme) three-component composites with both graphite and MoS2 exhibited high wear resistance. Under the “block-on-ring” scheme, the possibility of the transfer film formation was minimized, since the large-area counterpart slid against the ‘non-renewable’ surface of the polymer composite (at a ‘shortage’ of solid lubricant particles). On the other hand, graphite and MoS2 particles served as reinforcing inclusions. Finally, numerical simulation of the tribological test according to the ‘block-on-ring’ scheme was carried out. Within the framework of the implemented model, the counterpart roughness level exerted the significantly greater effect on wear rate in contrast to the porosity.

A review on recent advances on improving polyimide matrix nanocomposites for mechanical, thermal, and tribological applications: Challenges and recommendations for future improvement

2021 ◽  
pp. 089270572110079
Author(s):  
Victor E Ogbonna ◽  
Patricia I Popoola ◽  
Olawale M Popoola ◽  
Samson O Adeosun
Keyword(s):  
Wear Resistance ◽  
High Strength ◽  
Weight Percent ◽  
Wear Properties ◽  
Mechanical And Tribological Properties ◽  
Friction Component ◽  
Future Improvement ◽  
Component Material ◽  
Percent Concentration ◽  
Polyimide Matrix

In recent years, advancements on improving the mechanical and tribological properties of polyimide nanocomposites have remarkably increased, owing to the fact that polyimide nanocomposites exhibits lightweight, high strength, thermal stability as well as anti-wear and solvent resistance. The polyimide nanocomposites are described as material of polyimide matrix reinforced with certain volume or weight percent concentration of nanofillers. Researchers have demonstrated the importance of thermoplastic polyimide nanocomposites in mechanical, thermal, and tribological applications. However, the nanocomposites are reportedly facing interfacial adhesion issues and surface properties degradation, which have affected their mechanical, friction, and abrasive wear resistance for tribological applications. Although, much advancements on improving the mechanical, thermal, and wear resistance properties of polyimide nanocomposites has been reported. However, this review summarizes the effects of nanofillers, such as carbon nanotubes (CNTs), graphene (GN), graphene oxide (GO), boron nitride (BN), molybdenum disulfide (MoS2), silica (SiO2), titania (TiO2), alumina (Al2O3), carbon fibres (CF), aramid fibre (AF), glass fibre (GF), zinc dioxide (ZnO2), zirconium dioxide (ZrO2), silicon nitride (Si2N4), and carbon nitride (C3N4) on the mechanical, thermal, and wear properties of polyimide nanocomposites for tribological applications. The authors concluded the review study with advancement, challenges and suggestions for future improvement of polyimide nanocomposites as friction component material. Thus, the review offers an insight into the improvement and selection of polyimide nanocomposites material for mechanical, thermal, and tribological applications. More so, the review will also give away for further research.

The effects of adding carbon nanotubes to the mechanical and tribological properties of a carbon fibre reinforced polyether ether ketone composite

2009 ◽  
Vol 223 (11) ◽  
pp. 2501-2507 ◽  
Author(s):  
J Li ◽  
L Q Zhang
Keyword(s):  
Carbon Nanotubes ◽  
Wear Resistance ◽  
Carbon Fibre ◽  
Vinyl Ester ◽  
High Wear Resistance ◽  
Compression Moulding ◽  
Mechanical And Tribological Properties ◽  
Polyether Ether Ketone ◽  
Carbon Nano Tubes ◽  
Ether Ketone

The main objective of this article is to develop a high wear resistance carbon fibre (CF)-reinforced polyether ether ketone composite with the addition of multi-wall carbon nano-tubes (MWCNT). These compounds were well mixed in a Haake batch mixer and compounded polymers were fabricated into sheets of known thickness by compression moulding. Samples were tested for wear resistance with respect to different concentrations of fillers. Wear resistance of a composite with 20 wt% of CF increases when MWCNT was introduced. The worn surface features have been examined using a scanning electron microscope (SEM). Photomicrographs of the worn surfaces revealed higher wear resistance with the addition of carbon nanotubes. Also better interfacial adhesion between carbon and vinyl ester in a carbon-reinforced vinyl ester composite was observed.

scholarly journals An Overview on the Tribological Performance of Titanium Alloys with Surface Modifications for Biomedical Applications

Lubricants ◽  
2019 ◽  
Vol 7 (8) ◽  
pp. 65 ◽  
Author(s):  
Kaur ◽  
Ghadirinejad ◽  
Oskouei
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Titanium Alloys ◽  
Weight Ratio ◽  
High Strength ◽  
Surface Modifications ◽  
Tribological Performance ◽  
The Body ◽  
High Wear Resistance ◽  
Medical Implants

The need for metallic biomaterials will always remain high with their growing demand in joint replacement in the aging population. This creates need for the market and researchers to focus on the development and advancement of the biometals. Desirable characteristics such as excellent biocompatibility, high strength, comparable elastic modulus with bones, good corrosion resistance, and high wear resistance are the significant issues to address for medical implants, particularly load-bearing orthopedic implants. The widespread use of titanium alloys in biomedical implants create a big demand to identify and assess the behavior and performance of these alloys when used in the human body. Being the most commonly used metal alloy in the fabrication of medical implants, mainly because of its good biocompatibility and corrosion resistance together with its high strength to weight ratio, the tribological behavior of these alloys have always been an important subject for study. Titanium alloys with improved wear resistance will of course enhance the longevity of implants in the body. In this paper, tribological performance of titanium alloys (medical grades) is reviewed. Various methods of surface modifications employed for titanium alloys are also discussed in the context of wear behavior.

scholarly journals A Study on Strengthening Mechanical Properties of a Punch Mold for Cutting by Using an HWS Powder Material and a DED Semi-AM Method of Metal 3D Printing

2020 ◽  
Vol 4 (4) ◽  
pp. 98 ◽  
Author(s):  
Seong-Woong Choi ◽  
Yong-Seok Kim ◽  
Young-Jin Yum ◽  
Soon-Yong Yang
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Powder Material ◽  
Hot Stamping ◽  
Heterogeneous Materials ◽  
Heterogeneous Material ◽  
High Strength ◽  
High Wear Resistance ◽  
Metal 3D Printing ◽  
Directed Energy

The post-processing (punching or trimming) of high-strength parts reinforced by hot stamping requires punch molds with improved mechanical properties in hardness, resistance to wear, and toughness. In this study, a semi-additive manufacturing (semi-AM) method of heterogeneous materials was proposed to strengthen these properties using high wear resistance steel (HWS) powder and directed energy deposition (DED) technology. To verify these mechanical properties as a material for the punch mold for cutting, specimens were prepared and tested by a semi-AM method of heterogeneous material. The test results of the HWS additive material by the semi-AM method proposed in this study are as follows: the hardness was 60.59–62.0 HRc, which was like the Bulk D2 specimen. The wear resistance was about 4.2 times compared to that of the D2 specimen; the toughness was about 4.0 times that of the bulk D2 specimen; the compressive strength was about 1.45 times that of the bulk D2 specimen; the true density showed 100% with no porosity. Moreover, the absorption energy was 59.0 J in a multi-semi-AM specimen of heterogeneous materials having an intermediate buffer layer (P21 powder material). The semi-AM method of heterogeneous materials presented in this study could be applied as a method to strengthen the punch mold for cutting. In addition, the multi-semi-AM method of heterogeneous materials will be able to control the mechanical properties of the additive material.

MICROSTRUCTURAL STUDY OF THE MULTIPHASE BAINITIC STEEL THROUGH HEAVY COMPRESSION

2012 ◽  
Vol 05 ◽  
pp. 350-358
Author(s):  
F. HAJI-AKBARI ◽  
M. NILI-AHMADABADI ◽  
H. PISHBIN ◽  
B. POORGANJI ◽  
T. FURUHARA
Keyword(s):  
Wear Resistance ◽  
Bainitic Ferrite ◽  
High Strength ◽  
High Wear Resistance ◽  
Dual Phase ◽  
Bainitic Steel ◽  
Compression Tests ◽  
High Angle ◽  
Microstructural Study ◽  
Nano Grains

High Si bainitic steel has received much interest because of combined ultra high strength, good ductility along with high wear resistance. In this study, the microstructural evolution of dual phase bainitic ferrite-austenite steel after heavy compression was investigated. Compression tests were conducted at temperature of 298K on the rectangular billets at the strain rate of 0.001s-1. The samples were deformed to 40% and 70% of their original thickness. The EBSD results show formation of nano grains with high angle grain boundaries through 70% compression, which confirms grain refinement. Additionally, 40% deformation resulted in enhancement of the dislocation density and formation of subgrains at ferrite unites. Also, it was found during 70% compression of the steel, the austenite transforms to the martensite, which is in agreement with thermodynamic calculations.

scholarly journals Microstructure and Properties of Cladding Layers Prepared by Argon-Shielded Arc Cladding of CuZn40-WC Powders on Pure Aluminum Substrate

Coatings ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 382
Author(s):  
Xinge Zhang ◽  
Qing Sang ◽  
Zhenan Ren ◽  
Guofa Li
Keyword(s):  
Wear Resistance ◽  
Pure Aluminum ◽  
Weight Ratio ◽  
High Strength ◽  
Aluminum Substrate ◽  
High Wear Resistance ◽  
Microstructure And Properties ◽  
Cladding Layer ◽  
Wear Damage ◽  
Cladding Layers

Aluminum and aluminum alloys have the advantage of a high strength-to-weight ratio, but their low hardness and poor wear resistance often cause wear damage. In the present study, the cladding layer was prepared using argon-shielded arc cladding of CuZn40-WC powders which were pre-coated on a pure aluminum substrate. The effects of WC proportion on the morphology, microstructure, and properties of cladding layers were investigated in detail. The results indicated that the optimal WC proportion in CuZn40-WC powders was 60 wt.%. With the increase of WC proportion, although the morphology of the cladding layer became slightly worse, the surface quality of the cladding layer was acceptable for industrial application until the WC proportion was 80 wt.%. Meanwhile, the top width and maximum depth of the cladding layer decreased. The maximum microhardness and optimal wear resistance of the cladding layer were 4.5 and 2.5 times that of the aluminum substrate, respectively. The increased microhardness and wear resistance were mainly attributed to the formation of Al4W in the cladding layer. The wear scar of the high wear resistance specimen was smoother and some bulk Al4W compounds were clearly observed on the wear surface.

scholarly journals Wear Performance of Value-Addition Epoxy/Breadfruit Seed Shell Ash Particles and Functionalized Momordica Angustisepala Fiber Hybrid Composites

2020 ◽  
Vol 30 (5-6) ◽  
pp. 195-202
Author(s):  
Vincent C. Ezechukwu ◽  
Chukwuemeka C. Nwobi-Okoye ◽  
Philip N. Atanmo ◽  
Victor S. Aigbodion
Keyword(s):  
Wear Resistance ◽  
Wear Rate ◽  
Wear Mechanism ◽  
Adhesive Wear ◽  
Hybrid Composites ◽  
Numerical Approach ◽  
High Wear Resistance ◽  
Wear Performance ◽  
Wear Damage ◽  
Hardness Values

The numerical approach for the study of wear performance of breadfruit seed shell ash particles (BFSAp) and Sodium hydroxide (OH)/silane (APS)functionalized Momordica angustisepala fiber (MAf)/epoxy hybrid composites were investigated. The MAf fibers were treated with an OH-APS solution. Hardness values, wear rate and wear mechanism of the samples were determined. A 65.82% improvement in wear resistance was obtained at the load of 30N of 30wt%MAf-20wt%BFSAp composite. The wear rate and wear damage followed in this order: epoxy(matrix)˂epoxy/30wt%MAf-20wt%BFSAp˂epoxy/OH-APS treated 30wt%MAf-20wt%BFSAp composites. The wear mechanism observed in this work is a combination of abrasive and adhesive wear. High wear resistance was obtained in epoxy/OH-APS treated 30wt%MAf-20wt%BFSAp composites.

scholarly journals Substrate Temperature Effect on the Microstructure and Properties of (Si, Al)/a-C:H Films Prepared through Magnetron Sputtering Deposition

2015 ◽  
Vol 2015 ◽  
pp. 1-9
Author(s):  
Xiaoqiang Liu ◽  
Junying Hao ◽  
Hu Yang ◽  
Xiuzhou Lin ◽  
Xianguang Zeng
Keyword(s):  
Wear Resistance ◽  
Magnetron Sputtering ◽  
Substrate Temperature ◽  
Temperature Effect ◽  
Photoelectron Spectroscopy ◽  
Ambient Air ◽  
Carbon Films ◽  
High Wear Resistance ◽  
Sputtering Deposition ◽  
Mechanical And Tribological Properties

Hydrogenated amorphous carbon films codoped with Si and Al ((Si, Al)/a-C:H) were deposited through radio frequency (RF, 13.56 MHz) magnetron sputtering on Si (100) substrate at different temperatures. The composition and structure of the films were investigated by means of X-ray photoelectron spectroscopy (XPS), TEM, and Raman spectra, respectively. The substrate temperature effect on microstructure and mechanical and tribological properties of the films was studied. A structural transition of the films from nanoparticle containing to fullerene-like was observed. Correspondingly, the mechanical properties of the films also had obvious transition. The tribological results in ambient air showed that high substrate temperature (>573 K) was disadvantage of wear resistance of the films albeit in favor of formation of ordering carbon clusters. Particularly, the film deposited at temperature of 423 K had an ultralow friction coefficient of about 0.01 and high wear resistance.

DURA-BAR 100-70-03

Alloy Digest ◽  
2020 ◽  
Vol 69 (10) ◽  
Keyword(s):  
Wear Resistance ◽  
Compressive Strength ◽  
Physical Properties ◽  
Ductile Iron ◽  
High Strength ◽  
Heat Treating ◽  
High Wear Resistance ◽  
Continuous Cast ◽  
Hardness Values ◽  
Cast Products

Abstract Dura-Bar 100-70-03 is a pearlitic ductile iron that is used for continuous cast products. It has the best wear resistance of the ascast ductile irons and is used in applications requiring high strength and high wear resistance. This grade is normally used as an alternative to quenched and tempered steels that have hardness values less than 302 HBW. This datasheet provides information on composition, physical properties, microstructure, hardness, elasticity, tensile properties, and compressive strength. It also includes information on heat treating and machining. Filing Code: CI-74. Producer or source: Charter Dura-Bar, Inc.

VENANGO SPECIAL

Alloy Digest ◽  
1957 ◽  
Vol 6 (12) ◽  
Keyword(s):  
Wear Resistance ◽  
Compressive Strength ◽  
Carbon Content ◽  
Tensile Properties ◽  
Compression Strength ◽  
High Strength ◽  
Heat Treating ◽  
High Impact ◽  
High Wear Resistance ◽  
Aisi Type

Abstract VENANGO SPECIAL is a low-alloy high-strength tool steel of the silico-manganese type having high impact and high compression strength plus high wear resistance. It is similar to AISI Type S2 but with higher carbon content. This datasheet provides information on composition, hardness, tensile properties, and compressive strength. It also includes information on forming, heat treating, and machining. Filing Code: TS-65. Producer or source: Cyclops Corporation.

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