scholarly journals Electrodeposition of a Ni–P–TiO2/Ti3C2Tx Coating with in situ Grown Nanoparticles TiO2 on Ti3C2Tx Sheets

Coatings ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 750 ◽  
Author(s):  
Du ◽  
Zhang ◽  
Wei ◽  
Yu ◽  
Ma ◽  
...  
Keyword(s):  
Corrosion Rate ◽  
Coefficient Of Friction ◽  
Protective Coatings ◽  
Layer Structure ◽  
Corrosion Prevention ◽  
Oxidation Method ◽  
The Coefficient Of Friction ◽  
Coarse Surface ◽  
Wear Tests

Protective coatings have received considerable attention for the surface treatment of devices. Herein, in situ grown nanoparticles, TiO2 on Ti3C2Tx sheets (TiO2/Ti3C2Tx), are prepared by a simple hydrothermal oxidation method possessing the layer structure, which is applied to prepare protective coatings. The Ni–P–TiO2/Ti3C2Tx coating is prepared by electroplating technology, revealing more excellent properties than those of the Ni–P coating. Compared with the Ni–P coating, even though the Ni–P–TiO2/Ti3C2Tx coating holds the rough surface, the wettability is changed from hydrophilic to hydrophobic, owing to the gathering existence of TiO2/Ti3C2Tx on the surface and coarse surface texture. In addition, the participation of TiO2/Ti3C2Tx in the Ni–P coating can improve the capacity of corrosion prevention and decrease the corrosion rate. According to the results of hardness and wear tests, microhardness of the Ni–P–TiO2/Ti3C2Tx coating is approximately 1350 kg mm–2 and the coefficient of friction (COF) of Ni–P–TiO2/Ti3C2Tx coatings is about 0.40, which is much lower than that of Ni–P coatings. Thus, the Ni–P–TiO2/Ti3C2Tx coating can be a promising material to protect the surface of equipment.

Manufacture and Tribological Properties of C/C-SiC Brake Composites Fabricated by Warm Compacted In Situ Reaction

2010 ◽  
Vol 97-101 ◽  
pp. 1665-1668 ◽  
Author(s):  
Xiao Peng ◽  
Li Zhuan ◽  
Xiong Xiang
Keyword(s):  
Silicon Carbide ◽  
Wear Rate ◽  
Carbon Fibre ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Tribological Performance ◽  
Matrix Composites ◽  
The Coefficient Of Friction ◽  
Sic Composites

Carbon fibre reinforced carbon and silicon carbide dual matrix composites (C/C-SiC) were fabricated by warm compacted in-situ reaction. The C/C-SiC composites microstructure and tribological properties at different brake speeds were investigated. The results indicated that the composites were composed of 58 wt% C, 37 wt% SiC and 5 wt% Si. The density and open porosity were 2.0 g•cm-3 and 10%, respectively. The C/C-SiC brake composites show excellent tribological performance, including a good stability of brake, the coefficient of friction between 0.57 and 0.67, and the wear rate less than 2.02 cm3•MJ-1. These results show that the C/C-SiC brake composites are the promising candidates for advanced brake and clutch systems.

Cast In-Situ Al (Mg,Mo)-Al2O3 (MoO3) Composite: Characterization and Tribological Behavior

Tribology ◽  
2005 ◽  
Author(s):  
Abdulhaqq Q. Hamid ◽  
Sataish C. Jain ◽  
Prakriti K. Ghosh ◽  
Subrata Ray
Keyword(s):  
Wear Rate ◽  
Coefficient Of Friction ◽  
Molten Aluminum ◽  
Normal Load ◽  
Processing Temperature ◽  
In Situ Composite ◽  
Rate Of Increase ◽  
Alumina Particles ◽  
The Coefficient Of Friction

Aluminum alloy-based cast in-situ composite has been synthesized by dispersion of externally added molybdenum trioxide particles (MoO3) in molten aluminum at the processing temperature of 850 °C. During processing, displacement reaction between molten aluminum and MoO3 particles, results in formation of alumina particles in-situ also releases molybdenum into molten aluminum. A part of this molybdenum forms solid -solution with aluminum and the remaining part reacts with aluminum to form intermetallic phase Mo(Al1−xFex)12 of different morphologies. Magnesium (Mg) is added to the melt in order to help wetting of alumina particles generated in-situ, by molten aluminum and help to retain these particles inside the melt. The mechanical properties (ultimate tensile stress, yield stress, percentage elongation and hardness) of the cast in-situ composite are relatively higher than those observed either in cast commercial aluminum or in cast Al-Mo alloys. The wear and friction of the resulting cast in-situ Al(Mg, Mo)Al2O3(MoO3) composites have been investigated using a pin-on-disc wear testing machine, at different normal loads of 9.8, 14.7, 19.6, 24.5, 29.4, 34.3 and 39.2 N and a constant sliding speed of 1.05 m/s, under dry sliding conditions. The results indicate that the cumulative volume loss and wear rate of cast in-situ composites are significantly lower than those observed either in cast commercial aluminum or in cast Al-Mo alloy, under similar load and sliding conditions. Beyond about 30-35 N loads, there appears to be a higher rate of increase in the wear rate in the cast in-situ composite as well as in cast commercial aluminum and cast Al-Mo alloy. For a given normal load, the coefficient of friction of cast in-situ composite is significantly lower than those observed either in cast commercial aluminum or cast Al-Mo alloy. The coefficient of friction of cast in-situ composite increases gradually with increasing normal load while those observed in cast commercial aluminum or cast Al-Mo alloy remain more or less the same. Beyond a critical normal load of about 30-35 N, the coefficient of friction decreases with increasing normal load in all the three materials.

scholarly journals Antifriction and Antiwear Effect of Lamellar ZrS2 Nanobelts as Lubricant Additives

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 329 ◽  
Author(s):  
Wei Tang ◽  
Chuang Yu ◽  
Shaogang Zhang ◽  
Songyong Liu ◽  
Xingcai Wu ◽  
...  
Keyword(s):  
Coefficient Of Friction ◽  
Carrying Capacity ◽  
Friction And Wear ◽  
Normal Load ◽  
Lubricant Additives ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
The Coefficient Of Friction ◽  
Wear Tests ◽  
Friction And Wear Tests

In this study, the tribological behavior of lamellar ZrS2 nanobelts as lubricant additives was investigated under different concentrations, normal load, velocity, and temperature. The friction and wear tests were performed using a tribometer and with a reciprocating motion. The results indicate that the lamellar ZrS2 nanobelt additives can effectively reduce the coefficient of friction and running-in time during the running-in period. With the addition of ZrS2, the wear volumes decrease significantly. The wear is mostly influenced by the tribological performance throughout the running-in period. The lower the running-in time and coefficient of friction are during the running-in period, the less amount of wear is shown. ZrS2 can significantly increase the load-carrying capacity of oil. The 1.0 wt% concentration of ZrS2 yields the best antifriction effect, antiwear performance, and load-carrying capacity. The ZrS2 additives can increase the working temperature of the oil. The friction-reducing and antiwear mechanisms of lamellar ZrS2 were discussed.

Performance of WC-Based, HVOF-Processed Coatings in Sliding Wear

1997 ◽  
Author(s):  
B.R. Marple ◽  
B. Arsenault ◽  
J. Voyer
Keyword(s):  
Coefficient Of Friction ◽  
Sliding Wear ◽  
Vickers Microhardness ◽  
Data Acquisition System ◽  
Comparative Performance ◽  
Moving Contact ◽  
Type Design ◽  
Hvof Process ◽  
The Coefficient Of Friction ◽  
Wear Tests

Abstract For applications in which two contacting surfaces are in constant motion relative to each other, materials that are both wear resistant and non-abrasive are often required. Such attributes become even more important when the moving contact occurs with no liquid lubricants present to facilitate sliding. In the present study several WC-based coatings deposited using the HVOF process and containing one or more metal constituents as the binder (or matrix) phase were evaluated to determine their performance under conditions cf sliding wear. Image analysis of the coatings indicated a level of porosity of less than 1%. Hardness measurements found that values for the Vickers microhardness number were in the range of 1100-1500. For the wear tests, the test couple consisted of a coated ring (thrust washer type design) rotating against a stationary carbon disk. For each test, the contact load, speed of rotation and duration were controlled. During the test, the temperature of the carbon disk and the torque were recorded using a data acquisition system. This data was used to determine the coefficient of friction for each couple which, together with the results of measurements of weight change, provided a measure of the comparative performance of the various coatings. The preliminary results indicated that the values for the coefficient of friction for the various couples ranged from 0.15 to 0.29. The three coating compositions consisting of lONi-WC, 12Co-WC and 17Co-WC were found to out-perform other WC-based materials in these sliding wear tests.

Friction and Wear of Hot Pressed Silicon Nitride and Other Ceramics

1986 ◽  
Vol 108 (4) ◽  
pp. 514-521 ◽  
Author(s):  
H. Ishigaki ◽  
I. Kawaguchi ◽  
M. Iwasa ◽  
Y. Toibana
Keyword(s):  
Fracture Toughness ◽  
Silicon Nitride ◽  
Coefficient Of Friction ◽  
Zirconium Oxide ◽  
Friction And Wear ◽  
Adsorbed Water ◽  
The Coefficient Of Friction ◽  
Pin On Disk ◽  
Wear Tests ◽  
Friction And Wear Characteristics

An investigation was conducted to determine the friction and wear characteristics of hot-pressed silicon nitride. Sliding produced wear debris and a damaged surface. The physical and crystallographic morphology of surfaces was compared with that of diamond ground surfaces. Wear tests were done with pin-on-disk apparatus at a load of 10N with various sliding speeds to 780 mm/s, and in four different environments which included in dry nitrogen, in air at humidities of 50 percent RH and 90 percent RH, and in distilled water. The results of the wear experiments indicated that residual α-silicon nitride was transformed into β-silicon nitride. Adsorbed water appeared to enhance plastic flow of the surface and reduced both the wear rate and friction. A second investigation was conducted to correlate the coefficient of friction with the fracture toughness of silicon nitride, silicon carbide, aluminum oxide and zirconium oxide. The friction experiments were done in reciprocating sliding, using spherical diamonds. Two tip radii, 0.005 mm and 0.1 mm were used over a range of load of 0.1 to 3N and a speed of 0.17 mm/s. The coefficient of friction was found to be inversely correlated with fracture toughness of all four ceramics in several conditions. Frictional anisotropy was also observed in the hot-pressed silicon nitride.

scholarly journals Friction and Wear Behavior of Alumina Composites with In-Situ Formation of Aluminum Borate and Boron Nitride

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4502
Author(s):  
Ashish K. Kasar ◽  
Pradeep L. Menezes
Keyword(s):  
Boron Nitride ◽  
Coefficient Of Friction ◽  
Wear Behavior ◽  
Hardness Measurement ◽  
Aluminum Borate ◽  
X Ray Diffraction ◽  
X Ray ◽  
The Coefficient Of Friction ◽  
Steel Balls

Wear and friction properties of Al2O3 composite reinforced with in-situ formed aluminum borate (9Al2O3·2B2O3) and hexa-boron nitride (h-BN) have been investigated. The initial constituents for the composites were Al2O3, AlN, and H3BO3. The H3BO3 was used as a source of B2O3, where B2O3 reacted with AlN and Al2O3 to form in-situ h-BN and 9Al2O3·2B2O3. Based on the thermodynamic calculation and phase transformation, four different compositions were selected. First, the powders were mixed by ball milling followed by compaction at 10 MPa. The compacted pellets were sintered at 1400 °C in vacuum. The composites were characterized using X-ray diffraction followed by hardness measurement and reciprocating sliding test against alumina and steel balls. The X-ray diffraction results revealed the formation of in situ phases of 9Al2O3·2B2O3 and h-BN that improved the tribological properties. By comparing the tribological performance of different composites, it was found that the hard 9Al2O3·2B2O3 phase maintains the wear resistance of composites, whereas the coefficient of friction is highly dependent on the counter ball. Against alumina ball, the lowest coefficient of friction was observed for the composites with maximum h-BN concentration and minimum aluminum borate concentration, whereas the opposite trend was observed against the steel ball.

Experimental Investigation of aluminum doping crumb rubber/epoxy composite in reciprocating motion

2015 ◽  
Vol 3 ◽  
pp. 1
Author(s):  
Goutam Chandra Karar ◽  
Nipu Modak
Keyword(s):  
Experimental Investigation ◽  
Coefficient Of Friction ◽  
Epoxy Composite ◽  
Normal Load ◽  
Crumb Rubber ◽  
The Other ◽  
Reciprocating Motion ◽  
Molding Process ◽  
Friction Tester ◽  
The Coefficient Of Friction

The experimental investigation of reciprocating motion between the aluminum doped crumb rubber /epoxy composite and the steel ball has been carried out under Reciprocating Friction Tester, TR-282 to study the wear and coefficient of frictions using different normal loads (0.4Kg, 0.7Kgand1Kg), differentfrequencies (10Hz, 25Hz and 40Hz).The wear is a function of normal load, reciprocating frequency, reciprocating duration and the composition of the material. The percentage of aluminum presents in the composite changesbut the other components remain the same.The four types of composites are fabricated by compression molding process having 0%, 10%, 20% and 30% Al. The effect of different parameters such as normal load, reciprocating frequency and percentage of aluminum has been studied. It is observed that the wear and coefficient of friction is influenced by the parameters. The tendency of wear goes on decreasing with the increase of normal load and it is minimum for a composite having 10%aluminum at a normal load of 0.7Kg and then goes on increasing at higher loads for all types of composite due to the adhesive nature of the composite. The coefficient of friction goes on decreasing with increasing normal loads due to the formation of thin film as an effect of heat generation with normal load.

scholarly journals Tribological Aspects, Optimization and Analysis of Cu-B-CrC Composites Fabricated by Powder Metallurgy

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4217
Author(s):  
Üsame Ali Usca ◽  
Mahir Uzun ◽  
Mustafa Kuntoğlu ◽  
Serhat Şap ◽  
Khaled Giasin ◽  
...  
Keyword(s):  
Weight Loss ◽  
Wear Rate ◽  
Coefficient Of Friction ◽  
Applied Load ◽  
Practical Significance ◽  
Tribological Characteristics ◽  
M 10 ◽  
Wide Range ◽  
The Coefficient Of Friction ◽  
Four Levels

Tribological properties of engineering components are a key issue due to their effect on the operational performance factors such as wear, surface characteristics, service life and in situ behavior. Thus, for better component quality, process parameters have major importance, especially for metal matrix composites (MMCs), which are a special class of materials used in a wide range of engineering applications including but not limited to structural, automotive and aeronautics. This paper deals with the tribological behavior of Cu-B-CrC composites (Cu-main matrix, B-CrC-reinforcement by 0, 2.5, 5 and 7.5 wt.%). The tribological characteristics investigated in this study are the coefficient of friction, wear rate and weight loss. For this purpose, four levels of sliding distance (1000, 1500, 2000 and 2500 m) and four levels of applied load (10, 15, 20 and 25 N) were used. In addition, two levels of sliding velocity (1 and 1.5 m/s), two levels of sintering time (1 and 2 h) and two sintering temperatures (1000 and 1050 °C) were used. Taguchi’s L16 orthogonal array was used to statistically analyze the aforementioned input parameters and to determine their best levels which give the desired values for the analyzed tribological characteristics. The results were analyzed by statistical analysis, optimization and 3D surface plots. Accordingly, it was determined that the most effective factor for wear rate, weight loss and friction coefficients is the contribution rate. According to signal-to-noise ratios, optimum solutions can be sorted as: the highest levels of parameters except for applied load and reinforcement ratio (2500 m, 10 N, 1.5 m/s, 2 h, 1050 °C and 0 wt.%) for wear rate, certain levels of all parameters (1000 m, 10 N, 1.5 m/s, 2 h, 1050 °C and 2.5 wt.%) for weight loss and 1000 m, 15 N, 1 m/s, 1 h, 1000 °C and 0 wt.% for the coefficient of friction. The comprehensive analysis of findings has practical significance and provides valuable information for a composite material from the production phase to the actual working conditions.

Sign in / Sign up

Export Citation Format

Share Document