Investigation on Friction, Anti-wear, and Extreme Pressure Properties of Different Grades of Polyalphaolefins With Functionalized Multi-walled Carbon Nanotubes as an Additive

2020 ◽  
Vol 142 (8) ◽  
Author(s):  
Homender Kumar ◽  
A. P. Harsha
Keyword(s):  
Carbon Nanotubes ◽  
Friction And Wear ◽  
Outer Diameter ◽  
Test Results ◽  
Extreme Pressure ◽  
Wear Properties ◽  
Multi Walled Carbon Nanotubes ◽  
Friction And Wear Properties ◽  
Analytical Tools ◽  
Walled Carbon Nanotubes

Abstract In the present investigation, the COOH-functionalized multi-walled carbon nanotubes (MWCNTs) having an outer diameter of 20–30 nm and length 1−2 μm were dispersed in four different grades of polyalphaolefins (PAOs; i.e., PAO 4, PAO 6, PAO 40, and PAO 100) at various concentrations (0.025, 0.05, 0.075, 0.10, and 0.15 wt%) to evaluate friction, anti-wear, and extreme pressure properties. The tribological test was conducted as per ASTM standard using four-ball tester. The test results showed that with the addition of MWCNTs, the friction and wear properties of PAOs had been improved significantly as compared to the base oils. It was also observed that MWCNTs exhibited excellent anti-wear properties than friction properties. The possible reasons for the improvement in friction and wear properties are discussed with the aid of various analytical tools.

scholarly journals Multiwalled carbon nanotubes enhanced the friction layer evolution and self-lubricating property of TiAl-10 wt% Ag-1 wt% MWCNTs sample

RSC Advances ◽  
2017 ◽  
Vol 7 (64) ◽  
pp. 40592-40599 ◽  
Author(s):  
Kang Yang ◽  
Hongru Ma ◽  
Xiyao Liu ◽  
Yangming Zhang ◽  
Qiang He
Keyword(s):  
Carbon Nanotubes ◽  
Energy Consumption ◽  
Multiwalled Carbon Nanotubes ◽  
Friction And Wear ◽  
Wear Properties ◽  
Multiwalled Carbon ◽  
Tial Alloys ◽  
Lubricating Property ◽  
Friction And Wear Properties ◽  
Reducing Energy

The necessity of reducing energy consumption and usage of material in aerospace and aviation industries drives the further optimization of friction and wear properties of TiAl alloys.

scholarly journals STUDY OF MUTAGENIC ACTIVITY NANO- AND MICROPARTICLES IN THE AMES TEST (SALMONELLA / MICROSOME)

2019 ◽  
Vol 98 (4) ◽  
pp. 455-460
Author(s):  
Lyudmila V. Akhaltseva ◽  
V. S. Zhurkov ◽  
L. P. Sycheva ◽  
O. N. Savostikova ◽  
A. V. Alekseeva
Keyword(s):  
Carbon Nanotubes ◽  
Ames Test ◽  
Mutagenic Activity ◽  
Dose Range ◽  
Gene Mutations ◽  
Outer Diameter ◽  
Multi Walled Carbon Nanotubes ◽  
Inner Diameter ◽  
Substitution Mutations ◽  
Walled Carbon Nanotubes

Introduction. One of the important steps in assessing the nanoparticles (NP) safety is the analysis of mutagenic activity, including the evaluation of gene, chromosomal, and genomic mutations. Material and methods. The purpose of this investigation is to study the ability of different NP aqueus suspensions and the same compounds in microforms to unduce gene mutations in Salmonella/microsome test (Ames test). Anatase titanium dioxide NP coated with simethicone (33.16 ± 16.7 nm, 5-50000 μg/ml), magnetite NP coated with silicate (10 nm, 0.92-575 μg/ml), silver NP coated with аrabian gum (14 ± 0.2 nm, 5-50000 μg/ml), aluminum hydroxide nanofibres (50-70 nm, 24-3000 μg/ml) and multi-walled carbon nanotubes (Taunit MWСNTs, outer diameter 15-40 nm, inner diameter 3-8 nm, length 2 and more microns, 5-50000 μg/ml). In parallel, the mutagenic activity of equivalent microparticles was evaluated in experiments. Ames test (Salmonella/microsomes) registers gene mutations induced by a different mechanism of action, in the variant with preincubation. A set of Salmonella typhimurium indicator strains: TA 100 (base pair substitution mutations), TA 98 and TA 97 (mutations of the frameshift type of the genetic code) were used. Using addition the S9 microsomal activating mixture during the experiment makes it is possible to determine the effect not only of the substances themselves, but also of their metabolites. Conclusion. The investigated nanomaterials as well as their micro analogs in the studied dose range did not induce gene mutations in the Ames test both in presence and absence microsomal activating mixture.

Characterization of Carbon Nanotube Growth via CVD Synthesis from a Liquid Precursor

2014 ◽  
Vol 23 (01n02) ◽  
pp. 1420001 ◽  
Author(s):  
Carol Jenkins ◽  
Melissa Cruz ◽  
Jen Depalma ◽  
Michael Conroy ◽  
Barbara Benardo ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Conditions ◽  
Outer Diameter ◽  
Carrier Gas ◽  
Phase Precursor ◽  
Multi Walled Carbon Nanotubes ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth ◽  
Walled Carbon Nanotubes

As novel theories and uses of carbon nanotubes (CNT) advance, it becomes increasingly important to characterize the methods of production. One such method of CNT production uses a liquid phase precursor (hydrocarbon with nanoparticle catalyst mix) that is injected into a tube furnace with a flowing carrier gas. The CNTs are grown in high purity and are collected on the surface of the quartz tube. The system allows for a number of variables to be tested such as growth temperatures, flow rate of the carrier gas, precursor injection rates and variations of precursor mix however, here only thermal effects are considered. Under thermal conditions ranging from 500 to 850°C, multi-walled carbon nanotubes (MWCNTs) are synthesized and characterized to determine inner and outer diameter as well as tube thickness.

Friction and Wear Properties of Laser Cladding Coatings under Boundary Lubrication Conditions

2011 ◽  
Vol 314-316 ◽  
pp. 143-146
Author(s):  
Xin Feng ◽  
Yan Qiu Xia
Keyword(s):  
Phase Composition ◽  
Laser Cladding ◽  
Friction And Wear ◽  
Liquid Paraffin ◽  
Extreme Pressure ◽  
Wear Properties ◽  
Aisi 52100 ◽  
Aisi 1045 ◽  
Aisi 52100 Steel ◽  
Friction And Wear Properties

AISI 1045 steels were laser-clad with Ni-based powder by CO2 HJ-4 coherent laser. The phase composition of the laser-cladding coating was investigated by means of X-ray diffraction (XRD). The cross-section of the cladding coating was observed using a scanning electron microscopy (SEM). The friction and wear properties of the laser cladding coatings sliding against AISI 52100 steel under the lubrication of liquid paraffin containing various anti-wear and extreme pressure additives were investigated using an Optimol SRV reciprocating motion friction and wear tester. Results showed that the laser-cladding coating considerably decreased coefficient of friction and increased wear resistance in sliding against AISI 52100 steel and attributed to the change in the hardness, phase composition of the laser-cladding coating and tribochemical reactions between the laser-cladding coating and the extreme pressure and anti-wear additives.

Friction and wear properties of aligned carbon nanotubes reinforced epoxy composites under water lubricated condition

Wear ◽  
2013 ◽  
Vol 308 (1-2) ◽  
pp. 105-112 ◽  
Author(s):  
Lei Yan ◽  
Huaiyuan Wang ◽  
Chao Wang ◽  
Liyuan Sun ◽  
Dujuan Liu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Friction And Wear ◽  
Epoxy Composites ◽  
Wear Properties ◽  
Aligned Carbon Nanotubes ◽  
Friction And Wear Properties

Friction and Wear Characteristics of Magneto-Rheological Elastomers Based on Silicone/Polyurethane Hybrid

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
Chenglong Lian ◽  
Kwang-Hee Lee ◽  
Chul-Hee Lee
Keyword(s):  
Friction And Wear ◽  
Matrix Material ◽  
Operating Conditions ◽  
Wear Depth ◽  
Test Results ◽  
Wear Properties ◽  
Wear Performance ◽  
Friction And Wear Properties ◽  
Magneto Rheological ◽  
Mr Effect

The friction and wear properties of four different types of magneto-rheological (MR) elastomer were investigated. The MR elastomers have different matrix materials and structures. Most MR elastomers have a silicone matrix, since it has a more significant MR effect under a magnetic field compared to other materials. The mechanical properties of silicone, however, are poor compared to other materials, so it is difficult to use them in engineering applications. Therefore, a new polyurethane matrix material was used to enhance the friction and wear properties of MR elastomer. Additionally, two different matrix materials (silicone and polyurethane) were synthesized, and MR elastomers were structurally combined to improve the friction and wear performance. The friction characteristics of each MR elastomer were evaluated under reciprocating operating conditions. Wear depth was also measured to estimate the wear resistance. The test results show that the friction and wear performance of the modified MR elastomers are enhanced compared with the silicone-based MR elastomer.

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