High-Temperature Wear Mechanism of Diamond at the Nanoscale: A Reactive Molecular Dynamics Study

2021 ◽  
Author(s):  
Qiang Lin ◽  
Sulin Chen ◽  
Zhe Ji ◽  
Zhewei Huang ◽  
Zhinan Zhang ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
High Temperature ◽  
Wear Mechanism ◽  
Reactive Molecular Dynamics ◽  
High Temperature Wear

scholarly journals Reactive molecular dynamics simulation of the high-temperature pyrolysis of 2,2′,2′′,4,4′,4′′,6,6′,6′′-nonanitro-1,1′:3′,1′′-terphenyl (NONA)

RSC Advances ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 5507-5515
Author(s):  
Liang Song ◽  
Feng-Qi Zhao ◽  
Si-Yu Xu ◽  
Xue-Hai Ju
Keyword(s):  
Molecular Dynamics ◽  
High Temperature ◽  
Molecular Dynamics Simulation ◽  
Molecular Dynamics Simulations ◽  
Dynamics Simulation ◽  
Reactive Molecular Dynamics ◽  
Ring Compounds ◽  
Fused Ring ◽  
Dynamics Simulations

The bimolecular and fused ring compounds are found in the high-temperature pyrolysis of NONA using ReaxFF molecular dynamics simulations.

scholarly journals Improvement of High Temperature Wear Behavior of In-Situ Cr3C2-20 wt. % Ni Cermet by Adding Mo

Crystals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 682
Author(s):  
Liang Sun ◽  
Wenyan Zhai ◽  
Hui Dong ◽  
Yiran Wang ◽  
Lin He
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Wear Mechanism ◽  
Room Temperature ◽  
Wear Behavior ◽  
Ceramic Particle ◽  
High Temperature Wear ◽  
The Coefficient Of Friction ◽  
Mo Content

Cr3C2-Ni cermet is a kind of promising material especially for wear applications due to its excellent wear resistance. However, researches were mainly concentrated on the experiment condition of room temperature, besides high-temperature wear mechanism of the cermet would be utilized much potential applications and also lack of consideration. In present paper, the influence of Mo content on the high-temperature wear behavior of in-situ Cr3C2-20 wt. % Ni cermet was investigated systematically. The friction-wear experiment was carried out range from room temperature to 800 °C, while Al2O3 ceramic was set as the counterpart. According to experimental results, it is indicated that the coefficient of friction (COF) of friction pairs risen at the beginning of friction stage and then declined to constant, while the wear rate of Cr3C2-20 wt. % Ni cermet risen continuously along with temperature increased, which attributes to the converted wear mechanism generally from typical abrasive wear to severe oxidation and adhesive wear. Generally, the result of wear resistance was enhanced for 13.4% (at 400 °C) and 31.5% (at 800 °C) by adding 1 wt. % Mo. The in-situ newly formed (Cr, Mo)7C3 ceramic particle and the lubrication phase of MoO3 can effectively improve the wear resistance of Cr3C2-20 wt. % Ni cermet.

A Reactive Molecular Dynamics Study ofn-Heptane Pyrolysis at High Temperature

2013 ◽  
Vol 117 (16) ◽  
pp. 3266-3278 ◽  
Author(s):  
Junxia Ding ◽  
Liang Zhang ◽  
Yan Zhang ◽  
Ke-Li Han
Keyword(s):  
Molecular Dynamics ◽  
High Temperature ◽  
Reactive Molecular Dynamics

SURFACE-INTERFACE MICROSTRUCTURES AND HIGH-TEMPERATURE WEAR PERFORMANCE OF HVOF-SPRAYED AND LASER-REMELTED NiCrBSi ALLOY COATINGS

2016 ◽  
Vol 24 (05) ◽  
pp. 1750057 ◽  
Author(s):  
DEJUN KONG ◽  
BENGUO ZHAO
Keyword(s):  
High Temperature ◽  
Wear Mechanism ◽  
Adhesive Wear ◽  
Chemical Elements ◽  
Early Stage ◽  
Fatigue Wear ◽  
Wear Performance ◽  
High Temperature Wear ◽  
The Coefficient Of Friction ◽  
Nicrbsi Coating

A high-velocity oxygen fuel (HVOF)-sprayed NiCrBSi coating on H13 hot work die steel was processed with laser remelting; and the surface-interface morphologies, concentrations of chemical elements, and phases of the coating were analyzed with scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD), respectively. The friction-wear behaviors of the coating at high temperatures were investigated by the means of ball/plane contact. The effects of high temperature on the coefficient of friction (COF) and wear performance are discussed. The results show that the coating is dense and tightly bonded to the substrate at the interface. The average COFs at 500[Formula: see text]C, 600[Formula: see text]C, and 700[Formula: see text]C are 0.3749, 0.3609, and 0.4556, respectively. The wear mechanism is slight adhesive wear at 500[Formula: see text]C, and primarily oxidative wear and fatigue wear at 600[Formula: see text]C. The wear mechanism at 700[Formula: see text]C is oxidized wear and fatigue wear in the early stage, and mainly adhesive wear in the later stage. During high-temperature wear, an oxide film is formed on the coating surface, decreasing the wear resistance of the coating, which is primarily dependent on the compounds of Ni, Cr, B, Si, and C and the oxides of Si.

Reactive molecular dynamics study of Mo-based alloys under high-pressure, high-temperature conditions

2012 ◽  
Vol 112 (1) ◽  
pp. 013511 ◽  
Author(s):  
Alex Vasenkov ◽  
David Newsome ◽  
Osvalds Verners ◽  
Michael F. Russo ◽  
Roussislava Zaharieva ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
High Pressure ◽  
High Temperature ◽  
Reactive Molecular Dynamics ◽  
Temperature Conditions ◽  
High Pressure High Temperature

scholarly journals Study on the High Temperature Friction and Wear Behaviors of Cu-Based Friction Pairs in Wet Clutches by Pin-on-Disc Tests

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Er-Hui Zhao ◽  
Biao Ma ◽  
He-Yan Li
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Wear Mechanism ◽  
Friction And Wear ◽  
Adhesive Wear ◽  
Wear Factor ◽  
High Temperature Wear ◽  
Delamination Wear ◽  
Different Temperatures ◽  
Pin On Disc

This work is devoted to the study of the high temperature friction and wear behaviors of Cu-based friction pairs in wet clutches under different temperatures, rotation speeds, and loads. Pin-on-disc tests are carried out on the UMT-3. The friction coefficient, wear factor, and high temperature wear mechanism are primarily analyzed. The results show that as the temperature rises from 120°C to 420°C, the friction coefficient increases from 0.28 to 0.35 at first and then decreases to 0.30, when the vibration of friction coefficient is significantly identified. Meanwhile, the wear factor grows gradually from K=7.9×10-8 g/Nm to K=41.8×10-8 g/Nm at first and then grows sharply to K=112.2×10-8 g/Nm. The main wear mechanisms are abrasive wear and ploughing wear when the temperature is below 345°C, and the wear seriously deteriorates when the temperature exceeds 345°C, when the wear mechanism changes to adhesive wear and delamination wear.

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