scholarly journals Microstructure and Tribological Performance of Mesocarbon Microbead–Silicon Carbide Composites

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3127 ◽  
Author(s):  
Xiaojie Wang ◽  
Xiumin Yao ◽  
Hui Zhang ◽  
Xuejian Liu ◽  
Zhengren Huang
Keyword(s):  
Silicon Carbide ◽  
Tribological Properties ◽  
Dry Friction ◽  
Tribological Performance ◽  
Wear Process ◽  
Lubricating Film ◽  
Sic Composites ◽  
Pin On Disk ◽  
Disk Method ◽  
Pls Method

Mesocarbon microbead–silicon carbide (MCMB–SiC) composites with 0–30 wt % MCMBs were prepared by pressureless sintering (PLS) method at 2200 °C in Ar. The microstructure and tribological properties of the prepared composites were investigated. The results show that there was a finer grain size of SiC with the increase in MCMB content because MCMBs hinder the growth of SiC grains. The hardness of the composites decreased with increasing MCMB content, whereas the fracture toughness fluctuated showing a complex trend. The tribological properties of the composites under dry friction conditions were evaluated using the pin-on-disk method against a SiC counterpart. We found that the tribological properties of the samples were influenced by the oxide film or lubricating film that formed during the wear process on wear surfaces. Different wear mechanisms were found to be associated with differing MCMB contents.

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.

Influences of Gases on the Tribological Properties of Pure Iron

2011 ◽  
Author(s):  
Kanao Fukuda ◽  
Joichi Sugimura
Keyword(s):  
Tribological Properties ◽  
Dry Friction ◽  
Pure Iron ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
The Other ◽  
Vacuum Vessel ◽  
Friction Coefficients ◽  
Wear Rates ◽  
Pin On Disk

In this study, trace oxygen and water as impurities in experimental gas environments were reduced to less than 10 ppb to eliminate their influences on the tribological properties. A pin-on-disk apparatus in an ultra-high vacuum vessel equipped with a gas filtering system enabled pure experimental gas environments. Dry friction tests clarified that the tribological properties of pure iron in ultra-high vacuum and argon were similar to each other. On the other hand, friction coefficients obtained in hydrogen and nitrogen were considerably lower than those obtained in ultra-high vacuum and argon. Specific wear rates of pin and disk were close to each other in ultra-high vacuum, argon and hydrogen while those took very different values in nitrogen. Hydrogen influenced the tribological properties of pure iron to some extent but the influences were not as much as that of nitrogen.

Tribological Performance of Cell-Treated Nickel Matrix

2005 ◽  
Author(s):  
Bing Shi ◽  
Thomas Kuhn ◽  
Lawrence Duffy ◽  
Hong Liang
Keyword(s):  
Cell Culture ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Bovine Serum ◽  
Dry Friction ◽  
Culture Media ◽  
Tribological Performance ◽  
Nickel Matrix ◽  
Cell Culture Media ◽  
Pin On Disk

In this study, effects of cell culture on surface properties, and tribological performance were investigated. The wettability of Ni under dry and lubricated conditions, as well as cell-cultured specimens was evaluated. The tribological performance of these samples was compared using a pin-on-disk tribometer. Dry friction tests were conducted and compared with the bovine serum albumin (BSA) solution lubricated Ni and the cell culture media lubricated Ni. The lubrication behavior was discussed and new biofluid mechanisms were proposed.

Improvement of the Dry Friction and Wear Properties of the Si/SiC by Doping with Ni and PbO

2010 ◽  
Vol 658 ◽  
pp. 456-459
Author(s):  
Ke Zheng Sang ◽  
Wen Chao Wang ◽  
Gang Qiang Geng
Keyword(s):  
Silicon Carbide ◽  
Wear Resistance ◽  
Dry Friction ◽  
Lead Oxide ◽  
Friction And Wear ◽  
Sintering Process ◽  
Wear Properties ◽  
Dry Conditions ◽  
Friction And Wear Properties ◽  
Pin On Disk

The composite of silicon carbide with nickel and lead oxide was prepared by reaction sintered method. The phase compositions of the composites were studied by XRD, SEM and EDX. Friction and wear properties of the composites in dry conditions at the temperatures 15°C, 300°C and 600°C were tested using a pin-on-disk tribometer. The results showed that NiSi2 was formed and located between the SiC particles during sintering process. However the PbO was remained and distributed uniformly in the composites besides a little of Pb4SiO6 were formed. Friction coefficient of the composites decreased with the increase of the temperature and was about 0.2 at 600°C. And wear resistance of the composites was improved at all test temperatures comparing with that of the Si/SiC.

Tribological Properties of the Surface Bonded Self-Lubricating Coating

2010 ◽  
Vol 154-155 ◽  
pp. 583-587 ◽  
Author(s):  
Yan Guo Yin ◽  
Fu Dong Lin ◽  
Wei Yao ◽  
Ting Xie ◽  
Jian Wei Yu
Keyword(s):  
Carrying Capacity ◽  
Dry Friction ◽  
Tribological Performance ◽  
Transfer Film ◽  
Metallic Surface ◽  
Load Carrying Capacity ◽  
Sliding Speed ◽  
Lubricating Film ◽  
Load Carrying ◽  
Wear Tests

In order to investigate the effect of load and sliding speed on the tribological performance of epoxy bonded self-lubricating coatings on the metallic surface, a series of wear tests of the coatings containing MoS2 and graphite under dry friction conditions were carried out with different loads and speeds. The results showed that the appropriate load and speed are favorable to the formation of the solid lubricating film on the coating surface and the transfer film on the counterface, which make the coatings have better self-lubricating performance and the friction counterparts run steadily. The load carrying capacity of the surface adhesive self-lubricating coatings decreases as the sliding speed increases.

scholarly journals Tribological Performance of MoS2–WS2 Composite Film under the Atomic Oxygen Irradiation Conditions

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1407 ◽  
Author(s):  
Yanlong Fu ◽  
Dong Jiang ◽  
Desheng Wang ◽  
Xiaoming Gao ◽  
Ming Hu ◽  
...  
Keyword(s):  
Composite Film ◽  
Tribological Properties ◽  
Atomic Oxygen ◽  
Film Structure ◽  
Tribological Performance ◽  
Friction Process ◽  
Friction Noise ◽  
Lubricating Film ◽  
Friction Tester ◽  
Film Making

The oxidation and erosion of atomic oxygen are considered to be the most dangerous environmental factors for materials exposed to the aerospace environment. In order to investigate the effect of atomic oxygen on the lubricating film and improve the tribological properties, MoS2–WS2 composite film was prepared by the sputtering technique. The film structure and mechanical behavior were characterized and their vacuum tribological properties were evaluated by a friction tester. The composite film possessed better atomic oxygen (AO) resistance than pure film because of the dense structure. The tribological performance of composite film was different under the conditions after AO-irradiation and sliding and during AO-irradiation. After AO-irradiation, the tribological properties of composite film were similar to those before AO-irradiation. However, high friction noise, wear rate, and reduced wear duration were observed for the composite film under the AO-irradiation/friction process because of the continuous damage of the lubricating film due to the AO-irradiation. The addition of 16 at.% WS2 to the MoS2-based film changed the composite film structure and improved the oxidation resistance of the film, making the composite film exhibit better tribological performance than pure MoS2.

scholarly journals Increased durability of selected tools used in the rubber industry by hybrid treatment

Mechanik ◽  
2019 ◽  
Vol 92 (4) ◽  
pp. 257-262
Author(s):  
Ewa Kasprzycka ◽  
Arkadiusz Więczkowski ◽  
Bogdan Bogdański
Keyword(s):  
Tribological Properties ◽  
Vapour Deposition ◽  
Good Resistance ◽  
Nitride Coatings ◽  
Chlorine Ions ◽  
Pin On Disk ◽  
Hybrid Layers ◽  
Arc Evaporation ◽  
Disk Method ◽  
Concentration Depth Profiles

This research concerns hybrid layers of the CrC+CrN type, produced on the tool steel surface in subsequent processes, diffusion chromizing, carried out by inexpensive and technologically simple powder method, combined with the next arc evaporation treatment Arc PVD (arc evaporation physical vapour deposition), made for the deposition of chromium nitride coatings. Investigations of the microstructure of hybrid layers, as well as of their phase composition and concentration depth profiles of elements in diffusion zone of these layers, were carried out. In addition, the layers hardness, their tribological properties (pin-on-disk method) and corrosion resistance have been determined. It has been shown that hybrid layers of the CrC+CrN type are characterized by very good tribological properties at ambient temperature 25°C and at temperature 100°C as well as by very good resistance to corrosion in a solution containing chlorine ions.

Tribological Properties and Gear Performance of Polyoxymethylene Composites

2000 ◽  
Vol 122 (4) ◽  
pp. 809-814 ◽  
Author(s):  
Masaya Kurokawa ◽  
Yoshitaka Uchiyama ◽  
Susumu Nagai
Keyword(s):  
Mechanical Properties ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Calcium Salt ◽  
Bending Stress ◽  
The Coefficient Of Friction ◽  
Izod Impact ◽  
Sic Composites ◽  
Pin On Disk ◽  
Nucleating Effect

Tribological properties of polyoxymethylene (POM) composites containing a trace amount of silicon carbide (SiC) and/or calcium salt of octacosanoic acid (Ca-OCA) as well as containing polytetrafluoroethylene (PTFE) were investigated by means of a pin-on-disk type wear apparatus. The spherulite size of POM composites was measured using a polarizing microscope. Mechanical properties and gear performance of the composites were also evaluated. It was found that the coefficient of friction was drastically lowered due to the lubricant effect of Ca-OCA added to POM/SiC composites. Further, the wear rate was also decreased by the nucleating effect of SiC and Ca-OCA. Especially, POM/SiC(0.1)/Ca-OCA(1) composite containing SiC 0.1 wt.% and Ca-OCA 1 wt.% showed the coefficient of friction as low as that of POM/PTFE(24) composite containing PTFE 24 wt.%, keeping higher wear resistance. Also, its mechanical properties were found to be the same level as those of unfilled POM, except that its izod impact strength became higher than that of unfilled POM. Furthermore, its gear performance was confirmed to be satisfactory without generating noise under the dry running condition, when the same gears were combined below 13 MPa of bending stress. [S0742-4787(00)00304-0]

An experimental and theoretical study of the abrasion performance of digital light processing parts

2020 ◽  
pp. 095440542098133
Author(s):  
Mehdi Kazemi ◽  
Abdolreza Rahimi
Keyword(s):  
Layer Thickness ◽  
Normal Load ◽  
Digital Light Processing ◽  
One Step ◽  
Pin On Disk ◽  
The Relationship ◽  
Influential Parameters ◽  
Disk Method ◽  
Normal Angle

Generally, interactions at surface asperities are the cause of wear. Two-Thirds of wear in industry occurs because of the abrasive or adhesive mechanisms. This research presents an analytical model for abrasion of additive manufactured Digital Light Processing products using pin-on-disk method. Particularly, the relationship between abrasion volume, normal load, and surface asperities’ angle is investigated. To verify the proposed mathematical model, the results of this model are verified with the practical experiments. Results show that the most influential parameters on abrasion rate are normal load and surface’s normal angle. Abrasion value increases linearly with increasing normal load. The maximum abrasion value occurs when the surface’s normal angle during fabrication is 45°. After the asperities are worn the abrasion volume is the same for all specimens with different surface’s normal angle. Though layer thickness does not directly affect the wear rate, but surface roughness tests show that layer thickness has a great impact on the quality of the abraded surface. When the thickness of the layers is high, the abraded surface has deeper valleys, and thus has a more negative skewness. This paper presents an original approach in abrasion behavior improvement of DLP parts which no research has been done on it so far; thus, bringing the AM one step closer to maturity.

Parametric optimization of tribological properties on magnesium - tin – SiC composites

2021 ◽  
Author(s):  
E. Soundrapandian ◽  
V. Janarthanan ◽  
P. Vivekkumar ◽  
R. Sanjay ◽  
N. Gowtham ◽  
...  
Keyword(s):  
Tribological Properties ◽  
Parametric Optimization ◽  
Sic Composites
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