Superior wear resistance and low friction in hybrid ultrathin silicon nitride/carbon films: synergy of the interfacial chemistry and carbon microstructure

Nanoscale ◽  
2017 ◽  
Vol 9 (39) ◽  
pp. 14937-14951 ◽  
Author(s):  
Reuben J. Yeo ◽  
Neeraj Dwivedi ◽  
Lu Zhang ◽  
Zheng Zhang ◽  
Christina Y. H. Lim ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Silicon Nitride ◽  
Carbon Films ◽  
Interfacial Chemistry ◽  
Low Friction

A sub-10 nm hybrid SiNx/C film demonstrated remarkable wear durability under aggressive wear due to an enhanced interfacial chemistry and carbon microstructure.

Processing Technique for Wear Resistance Parts Using Ultra Fine Particles Reinforced Si3N4

2004 ◽  
Vol 449-452 ◽  
pp. 229-232
Author(s):  
Kazuo Osumi ◽  
Hideki Kita ◽  
Tateoki Iizuka ◽  
Takene Hirai
Keyword(s):  
Wear Resistance ◽  
Silicon Nitride ◽  
Fine Particles ◽  
High Strength ◽  
Processing Technique ◽  
Low Friction ◽  
Durability Test ◽  
Synthetic Process ◽  
Low Wear ◽  
Ultra Fine Particles

In this study, we developed silicon nitride with low friction, low wear and high strength for wear resistance parts. And this work is to study the basic synthetic process for ultra fine particles reinforced silicon nitride composites and the fabrication processes of wear resistance parts. The following results were obtained: 1) The basic synthetic and fabrication process for wear parts were almost established, 2) In engine durability test, it has confirmed that the wear resistance could be improved by using developed silicon nitride.

scholarly journals Key Role of Transfer Layer in Load Dependence of Friction on Hydrogenated Diamond-Like Carbon Films in Humid Air and Vacuum

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1550 ◽  
Author(s):  
Yunhai Liu ◽  
Lei Chen ◽  
Bin Zhang ◽  
Zhongyue Cao ◽  
Pengfei Shi ◽  
...  
Keyword(s):  
Applied Load ◽  
Carbon Films ◽  
Diamond Like Carbon ◽  
Low Friction ◽  
Transfer Layer ◽  
Humid Air ◽  
Friction Mechanism ◽  
Sharp Drop ◽  
Practical Applications ◽  
Load Dependence

The friction of hydrogenated diamond-like carbon (H-DLC) films was evaluated under the controlled environments of humid air and vacuum by varying the applied load. In humid air, there is a threshold applied load below which no obvious friction drop occurs and above which the friction decreases to a relatively low level following the running-in process. By contrast, superlubricity can be realized at low applied loads but easily fails at high applied loads under vacuum conditions. Further analysis indicates that the graphitization of the sliding H-DLC surface has a negligible contribution to the sharp drop of friction during the running-in process under both humid air and vacuum conditions. The low friction in humid air and the superlow friction in vacuum are mainly attributed to the formation and stability of the transfer layer on the counterface, which depend on the load and surrounding environment. These results can help us understand the low-friction mechanism of H-DLC film and define optimized working conditions in practical applications, in which the transfer layer can be maintained for a long time under low applied load conditions in vacuum, whereas a high load can benefit the formation of the transfer layer in humid air.

Tribological Behavior of PTFE Nanocomposites Reinforced with PBA Grafted Alumina Nanoparticles

2012 ◽  
Vol 184-185 ◽  
pp. 1380-1383
Author(s):  
Yong Ping Niu ◽  
Xiang Yan Li ◽  
Jun Kai Zhang ◽  
Ming Han ◽  
Yong Zhen Zhang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Wear Resistance ◽  
Friction Coefficient ◽  
Tribological Behavior ◽  
Compression Molding ◽  
Alumina Nanoparticles ◽  
Low Friction ◽  
Grafted Nanoparticles ◽  
Scanning Electron

Polybutyl acrylate (PBA) grafted alumina nanoparticles were synthesized. Polytetrafluoroethylene (PTFE) nanocomposites reinforced with PBA grafted nanoparticles were prepared by compression molding. The effects of PBA grafted nanoparticles on the tribological behavior of the PTFE nanocomposites were investigated on a tribometer. The abrasion mechanisms of the PTFE nanocomposites were investigated by scanning electron microscopy (SEM) of the abraded surfaces. The results show that the addition of PBA grafted nanoparticles maintains low friction coefficient and improves the wear resistance of the PTFE nanocomposites.

Friction behaviour and wear resistance of diamond-like carbon films under cryogenic temperatures

1994 ◽  
Vol 3 (11-12) ◽  
pp. 1381-1384 ◽  
Author(s):  
G.D. Gamulya ◽  
Ye.L. Ostrovskaya ◽  
I.L. Ostapenko ◽  
G.N. Presnyakova ◽  
V.E. Strel'nitskij
Keyword(s):  
Wear Resistance ◽  
Carbon Films ◽  
Diamond Like Carbon ◽  
Cryogenic Temperatures ◽  
Friction Behaviour

scholarly journals Robust low friction performance of graphene sheets embedded carbon films coated orthodontic stainless steel archwires

Friction ◽  
2021 ◽  
Author(s):  
Zonglin Pan ◽  
Qinzhao Zhou ◽  
Pengfei Wang ◽  
Dongfeng Diao
Keyword(s):  
Stainless Steel ◽  
Friction Coefficient ◽  
Orthodontic Treatment ◽  
Artificial Saliva ◽  
Carbon Film ◽  
Carbon Films ◽  
Graphene Sheets ◽  
Substrate Bias ◽  
Low Friction ◽  
Substrate Bias Voltage

AbstractReducing the friction force between the commercial archwire and bracket during the orthodontic treatment in general dental practice has attracted worldwide interest. An investigation on the friction and wear behaviors of the uncoated and carbon film coated stainless steel archwires running against stainless steel brackets was systematically conducted. The carbon films were prepared at substrate bias voltages from +5 to +50 V using an electron cyclotron resonance plasma sputtering system. With increasing substrate bias voltage, local microstructures of the carbon films evolved from amorphous carbon to graphene nanocrystallites. Both static and stable friction coefficients of the archwire-bracket contacts sliding in dry and wet (artificial saliva) conditions decreased with the deposition of carbon films on the archwires. Low friction coefficient of 0.12 was achieved in artificial saliva environment for the graphene sheets embedded carbon (GSEC) film coated archwire. Deterioration of the friction behavior of the GSEC film coated archwire occurred after immersion of the archwire in artificial saliva solution for different periods before friction test. However, moderate friction coefficient of less than 0.30 sustained after 30 days immersion periods. The low friction mechanism is clarified to be the formation of salivary adsorbed layer and graphene sheets containing tribofilm on the contact interfaces. The robust low friction and low wear performances of the GSEC film coated archwires make them good candidates for clinical orthodontic treatment applications.

Reduction in Wear Rate of α-Alumina and Silicon Nitride by Diffusional Surface Modification

1988 ◽  
Vol 140 ◽  
Author(s):  
A.K. Gangopadhyay ◽  
M.E. Fine ◽  
H.S. Cheng
Keyword(s):  
Wear Resistance ◽  
Thermal Expansion ◽  
Surface Modification ◽  
Silicon Nitride ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Surface Region ◽  
Lattice Parameter ◽  
Lower Thermal Expansion ◽  
Wear Modes

AbstractThe surface regions of α-alumina and hot pressed silicon nitride were modified by suitable alloying in order to improve their wear resistance. The surface modification in polycrystalline α-alumina was done by diffusing chromia into the surface region which resulted in the formation of a thin layer of A12O3 - Cr9O3 solid solution which has a lower thermal expansion coefficient than pure α-alumina. Also Cr2O3 has a larger lattice parameter than α-alumina thus during cooling the surface was put into compression. The surface region of hot pressed silicon nitride was modified by diffusing α-alumina into the surface which resulted in the formation of a thin sialon layer. A surface compressive stress was again introduced due to the lower thermal expansion coefficient and larger latticeparameter of sialon compared to silicon nitride.Wear tests were conducted against 52100 steel under both lubricated and unlubricated sliding contact using a block on ring apparatus. The wear resistance of chromia surface alloyed α-alumina was improved considerably over unalloyed α-alumina under both lubricated and unlubricated conditions. The wear resistance of alumina surface alloyed silicon nitride was also improved over unalloyed silicon nitride under both lubricated and unlubricated conditions.Different wear modes were identified by examining the worn surfaces under the scanning electron microscope.

Structure effects of sp2-rich carbon films under super-low friction contact

Carbon ◽  
2018 ◽  
Vol 137 ◽  
pp. 49-56 ◽  
Author(s):  
Yongfu Wang ◽  
Kaixiong Gao ◽  
Bin Zhang ◽  
Qi Wang ◽  
Junyan Zhang
Keyword(s):  
Carbon Films ◽  
Friction Contact ◽  
Low Friction
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