Friction and Wear Results From Sputter-Deposited Chrome Oxide With and Without Nichrome Metallic Binders and Interlayers

1981 ◽  
Vol 103 (2) ◽  
pp. 218-227 ◽  
Author(s):  
Bharat Bhushan
Keyword(s):  
High Temperature ◽  
High Speed ◽  
Friction And Wear ◽  
Room Temperature ◽  
Test Sequence ◽  
Interface Temperature ◽  
Maximum Acceleration ◽  
The Coefficient Of Friction ◽  
Sputter Deposited ◽  
Friction And Wear Tests

Friction and wear tests were conducted on optimized sputtered Cr2O3 and Cr2O3 with metallic binder coatings. The coatings were applied on the bearing surface of journal foil air bearings and were tested against chrome-carbide-coated journal surfaces. The objective of the study was to develop a coating system which would withstand 9000 start-stops and high-speed rubs (maximum acceleration, 100 gs) in temperatures ranging from room temperature to 650° C. The Cr2O3 coating completed the test sequence and the coating consisting of Cr2O3 with metallic binders completed 3000 start-stops. The coefficient of friction of the coatings at 650° C was found to be about half that at room temperature. It was concluded, therefore, that the coatings should perform much better in a high temperature environment alone. The decrease in friction at high temperature is attributed to oxidation and interactions of the coatings and substrates at the interface temperature.

Wear Rate of Nanocrystalline Diamond Coating under High Temperature Sliding Conditions

2017 ◽  
Vol 267 ◽  
pp. 219-223 ◽  
Author(s):  
Maxim Yashin ◽  
Janis Baroninš ◽  
Pradeep L. Menezes ◽  
Mart Viljus ◽  
Taavi Raadik ◽  
...  
Keyword(s):  
High Temperature ◽  
Wear Rate ◽  
Room Temperature ◽  
Chemical Vapor ◽  
Hard Metal ◽  
Nanocrystalline Diamond ◽  
Raman Spectrometry ◽  
The Coefficient Of Friction ◽  
Increasing Temperature ◽  
Friction And Wear Tests

The present study deals with the tribological behavior of nanocrystalline diamond (NCD) coatings at high temperature sliding conditions. The NCD coatings were grown by plasma enhanced chemical vapor deposition (PECVD) method on the hard metal (WC-Co) substrates. The friction and wear tests were performed on ball-on-disc tribometer using a high-temperature chamber with rotary drive. The tests were carried out at room temperature, 300, 450 and 600 °C. The scanning electron microscopy (SEM), optical microscopy, mechanical profilometry and Raman spectrometry were used for investigation of the morphology and chemical composition of the wear scars and pristine surface. The depth and width of the wear scars measured after the high temperature sliding tests are larger in comparison with room temperature tests. It was observed that the coefficient of friction (COF) increased with increasing temperature. The wear rate of NCD coatings tested at 300-450° C was about 10 times higher than that at room temperature. The mechanisms involved for these variations are discussed.

scholarly journals Friction and Wear Study of Fe-Cu-C-CaF2 Self-lubricating Composite at High Speed and High Temperature

2020 ◽  
Vol 834 ◽  
pp. 012010
Author(s):  
Sanjay Mohan ◽  
Ankush Anand ◽  
R. Arvind Singh ◽  
S. Jayalakshmi ◽  
Xizhang Chen ◽  
...  
Keyword(s):  
High Temperature ◽  
High Speed ◽  
Friction And Wear

scholarly journals Study on Wear and Fatigue Performance of Two Types of High-Speed Railway Wheel Materials at Different Ambient Temperatures

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1152
Author(s):  
Lei MA ◽  
Wenjian WANG ◽  
Jun GUO ◽  
Qiyue LIU
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
High Speed ◽  
Room Temperature ◽  
Lamellar Spacing ◽  
Wear Loss ◽  
High Speed Railway ◽  
Railway Wheel ◽  
Ambient Temperatures ◽  
Railway Wheels

The wear and fatigue behaviors of two newly developed types of high-speed railway wheel materials (named D1 and D2) were studied using the WR-1 wheel/rail rolling–sliding wear simulation device at high temperature (50 °C), room temperature (20 °C), and low temperature (−30 °C). The results showed that wear loss, surface hardening, and fatigue damage of the wheel and rail materials at high temperature (50 °C) and low temperature (−30 °C) were greater than at room temperature, showing the highest values at low temperature. With high Si and V content refining the pearlite lamellar spacing, D2 presented better resistance to wear and fatigue than D1. Generally, D2 wheel material appears more suitable for high-speed railway wheels.

Hydrogen-Induced Wear of Ti–6Al–4V Alloy

2012 ◽  
Vol 476-478 ◽  
pp. 566-569
Author(s):  
Bao Guo Yuan ◽  
Hai Ping Yu ◽  
Ping Li ◽  
Gui Hua Xu ◽  
Chun Feng Li ◽  
...  
Keyword(s):  
Wear Mechanism ◽  
Chemical Element ◽  
Friction And Wear ◽  
Room Temperature ◽  
Sliding Friction ◽  
Wear Properties ◽  
Friction And Wear Properties ◽  
Worn Surface ◽  
Wear Tests ◽  
Friction And Wear Tests

The effects of hydrogen on friction and wear properties of Ti–6Al–4V alloy sliding against GCr15 steel were investigated through dry sliding friction and wear tests in atmosphere at room temperature. Wear mechanism was determined by studying the morphology and chemical element of worn surface using SEM and EDS. Results show that friction coefficient decreases slightly and wear rate increases after hydrogenation. Wear mechanism is discussed.

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.

Investigation on Wear Behavior at High Temperature of Smooth and Bionic Non-Smooth Samples

2012 ◽  
Vol 157-158 ◽  
pp. 1628-1631
Author(s):  
Xiao Dong Yang ◽  
Zhuo Juan Yang ◽  
You Quan Chen
Keyword(s):  
High Temperature ◽  
Wear Mechanism ◽  
High Speed ◽  
Room Temperature ◽  
Wear Behavior ◽  
High Speed Steel ◽  
Wear Test ◽  
Test Method ◽  
Wear Characteristics ◽  
Pin On Disk

By using pin-on-disk wear test method, the wear behavior of W9Gr4V high speed steel with smooth and non-smooth concave samples which treated by laser texturing technology was investigated between room temperature and 500 . It was found that the anti-wear ability of the non-smooth concave samples was increased more than that of the smooth ones and the anti-wear ability of the non-smooth samples was evident than the smooth ones at temperature increasing. In this paper, the anti-wear mechanism of non-smooth concave samples and wear characteristics with smooth and non-smooth samples in high-temperature were analyzed.

HIGH-TEMPERATURE TRIBOLOGICAL BEHAVIORS OF TiNi/Ti2Ni ALLOYED LAYER ON SURFACE OF Ti6Al4V ALLOY

2017 ◽  
Vol 24 (03) ◽  
pp. 1750028 ◽  
Author(s):  
ZHENXIA WANG ◽  
HAIRUI WU ◽  
NAIMING LIN ◽  
XIAOHONG YAO ◽  
ZHIYONG HE ◽  
...  
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Friction And Wear ◽  
Room Temperature ◽  
Alloyed Layer ◽  
Surface Alloying ◽  
Wear Performance ◽  
Ti6al4v Substrate ◽  
Oxidation Wear ◽  
Plasma Surface Alloying

Plasma surface alloying (PSA) technique was employed with nickel as incident ions to prepare the TiNi/Ti2Ni alloyed layer on surface of Ti6Al4V. High-temperature friction and wear performance of TiNi/Ti2Ni alloyed layer and the Ti6Al4V substrate were evaluated at 500[Formula: see text]C. The results indicated that the TiNi/Ti2Ni alloyed layer exhibited superior high-temperature wear performance. The variations of friction coefficient were the same rule but wear rate was lower compared to Ti6Al4V substrate. The wear mechanism of TiNi/Ti2Ni alloyed layer was mainly slight abrasion and the Ti6Al4V substrate showed abrasion and oxidation wear. The friction coefficient of the TiNi/Ti2Ni alloyed layer decreased from 0.90 to 0.50 with the increase of temperature from room temperature to 500[Formula: see text]C.

scholarly journals Study on Friction and Wear Properties of Pantograph Strip/Copper Contact Wire for High-Speed Train

2014 ◽  
Vol 8 (1) ◽  
pp. 125-128 ◽  
Author(s):  
Tao Ding ◽  
Wenjing Xuan ◽  
Qiudong He ◽  
Hao Wu ◽  
Wei Xiong
Keyword(s):  
Wear Rate ◽  
Electric Current ◽  
High Speed ◽  
Friction And Wear ◽  
Optical Microscope ◽  
Wear Properties ◽  
Contact Wire ◽  
Arc Erosion ◽  
The Coefficient Of Friction ◽  
Friction And Wear Properties

A series of experiments on friction and wear properties of carbon strip rubbing against copper contact wire is performed on high-speed friction and wear tester with electric current. The results show that the friction coefficient is generally maintained between 0.24 and 0.37. In the absence of electric current, the coefficient of friction is higher than that in the presence of electric current. The wear rate of carbon strip materials is generally not more than 0.014g/km. In particular, the wear rate under the electric current of 240 A is 14 times more than that in the absence of electric current. By observing the scar of worn surface with optical microscope, it can be found that there are obvious slip scars and arc erosive pits. The dominated wear mechanisms are abrasive wear and arc erosion in electrical sliding frictional process.

DETERM INATION OF THE FRICTION COEFFICIENT IN THE FOIL-ROLLER COM BINATION

Tribologia ◽  
2018 ◽  
Vol 282 (6) ◽  
pp. 89-95
Author(s):  
Wiesław KOMAR ◽  
Waldemar DUDDA
Keyword(s):  
Friction Coefficient ◽  
Friction Factor ◽  
High Speed ◽  
Laboratory Tests ◽  
Friction And Wear ◽  
Liquid Environment ◽  
Foil Bearings ◽  
Wear Tests ◽  
Friction And Wear Tests

In order to verify and select the appropriate materials for cooperation in high-speed foil bearings in the particular tribological pair, a series of friction and wear tests of selected material pairs were carried out. This paper presents a method for determination of the friction coefficient, a basic quantity characterizing two materials cooperating frictionally in an atypical tribological combination of the foil-roller type. Laboratory tests, necessary to determine the friction factor value in the mentioned friction junction and in a low-boiling liquid environment, were carried out on a specially prepared test stand using the T-27 apparatus.

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