Tribological Characteristics of Coated Vane Surfaces Under Mixed Environments of Various Oils and CO2 as a Refrigerant

2005 ◽  
Author(s):  
Se-Doo Oh ◽  
Kyung-Soo Kim ◽  
Sung-Oug Cho ◽  
Young-Ze Lee
Keyword(s):  
High Pressure ◽  
Friction And Wear ◽  
Hard Coatings ◽  
Tribological Characteristics ◽  
Rotary Compressor ◽  
Wear Volume ◽  
Test Results ◽  
Sliding Surfaces ◽  
Polyalkylene Glycol ◽  
Air Conditioning Systems

The CO2 is investigated as an alternative refrigerant to replace HFC refrigerant in air conditioning systems due to the environmental concerns. Because new compressors with CO2 are going to be operated under the high pressure, the tribology of sliding surfaces in the compressor becomes very important. To develop new compressor, especially rotary type, the friction and wear characteristics of sliding surfaces between a vane and a roller in the rotary compressor were evaluated in this paper. Several hard coatings, such as TiN, CrN, WC/C and two types of nitridings, were applied on vane surfaces in order to improve the tribological characteristics, and their performances were evaluated experimentally. Two types of lubricants were used, namely POE (polyol ester) oil and PAG (polyalkylene glycol) oil. The vane-on-disk type sliding tests were performed with an exclusive high pressure wear tester. From the tests, coefficient of friction and wear volume of vane surfaces applied various coatings were compared. Test results showed that WC/C coatings showed good tribological properties. TiN and CrN coated vanes showed good wear resistance properties but produced high friction. Also, the results of the sliding tests showed that using PAG oil has an advantage over POE oil in CO2 environment.

The Tribological Characteristics of the Surface Coatings on Rotary Compressor Vane in Carbon Dioxide Environment

Tribology ◽  
2005 ◽  
Author(s):  
Se-Doo Oh ◽  
Young-Ze Lee
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Hard Coatings ◽  
Tribological Characteristics ◽  
Rotary Compressor ◽  
Wear Volume ◽  
Test Results ◽  
Sliding Surfaces ◽  
Air Conditioning Systems ◽  
Rotary Type

The carbon dioxide is investigated as an alternative refrigerant to replace HFC refrigerants in refrigerators and air conditioning systems due to the environmental concerns. Because new compressors with the carbon dioxide are going to be operated under the high pressure, the tribology of sliding surfaces in the compressor becomes very important. To develop new compressors, especially rotary type, the friction and wear characteristics of sliding surfaces between a vane and a roller in the rotary compressor were evaluated in this paper. Several hard coatings, such as TiN, CrN, WC/C and two types of nitridings, were applied on vane surfaces in order to improve the tribological characteristics, and their performances were evaluated experimentally. The vane-on-disk type sliding tests were carried out under the various sliding speeds, normal loads, and carbon dioxide pressures with an exclusive high pressure wear tester. From the tests wear volume of vane surfaces applied various coatings were compared. During the tests coefficients of friction and surface temperatures were monitored. Test results showed that WC/C coatings showed good tribological properties. TiN and CrN coated vanes showed good wear resistance properties but produced high friction.

Experimental Investigation on Friction and Wear of Coated Vane under the Environments of Lubricants and CO2 as a Refrigerant

2006 ◽  
Vol 326-328 ◽  
pp. 1185-1188 ◽  
Author(s):  
Se Doo Oh ◽  
Kyu Sun Lee ◽  
Jin Sun Kim ◽  
Sung Oug Cho ◽  
Young Ze Lee
Keyword(s):  
High Pressure ◽  
Friction And Wear ◽  
Hard Coatings ◽  
Rotary Compressor ◽  
Test Results ◽  
Sliding Surfaces ◽  
Polyalkylene Glycol ◽  
Air Conditioning Systems ◽  
Crn Coatings ◽  
Rotary Type

The CO2 was investigated as an alternative refrigerant to replace HFC (hydrofluorocarbons) refrigerant in air conditioning systems due to the environmental concerns. Because new compressors with CO2 are going to be operated under the high pressure, the tribology of sliding surfaces in the compressor becomes very important. To develop new compressor, especially rotary type, the friction and wear characteristics of sliding surfaces between a vane and a roller in the rotary compressor were evaluated in this paper. Several hard coatings, such as TiN, CrN and WC/C, were applied on vane surfaces in order to improve the tribological characteristics, and their performances were evaluated experimentally. Two types of lubricants were used, namely POE (polyol ester) oil and PAG (polyalkylene glycol) oil. The vane-on-disk type sliding tests were performed with an exclusive high pressure wear tester. From the tests, wear volumes of vane surfaces applied various coatings were compared. Test results showed that WC/C and CrN coatings showed good tribological properties. Also, the results of the sliding tests showed that using PAG oil has an advantage over POE oil in CO2 environment.

The Tribological Behaviors of the Surfaces Lubricated by Polyaklylene Glycol and Polyolester Oils in Carbon Dioxide Environment

2006 ◽  
Vol 321-323 ◽  
pp. 1548-1551
Author(s):  
Se Doo Oh ◽  
Tae Shik Ahn ◽  
Sung Oug Cho ◽  
Young Ze Lee
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Hard Coatings ◽  
Rotary Compressor ◽  
Wear Volume ◽  
Test Results ◽  
Sliding Surfaces ◽  
Carbon Dioxide Co2 ◽  
Air Conditioning Systems ◽  
Rotary Type

The carbon dioxide (CO2) is investigated as an alternative refrigerant to replace HFC (hydro fluorocarbon) refrigerants in refrigerators and air conditioning systems due to the environmental concerns. Because new compressors with the carbon dioxide are going to be operated under the high pressure, the tribology of sliding surfaces in the compressor becomes very important. To develop new compressors, especially rotary type, the friction and wear characteristics of sliding surfaces between a vane and a roller in the rotary compressor were evaluated in this paper. Several hard coatings, such as TiN, CrN, and WC/C, were applied on vane surfaces in order to improve the tribological characteristics, and their performances were evaluated experimentally. The vane-on-disk type sliding tests were carried out under the various sliding speeds, normal loads, and carbon dioxide pressures with an exclusive high pressure wear tester. From the tests wear volume of vane surfaces applied various coatings were compared. During the tests coefficients of friction and surface temperatures were monitored. Test results showed that WC/C coatings showed good tribological properties. TiN and CrN coated vanes showed good wear resistance properties but produced high friction.

The Effect of Various Surface Coatings on Tribological Characteristics of Rotary Compressor Vane in Carbon Dioxide Environment

2006 ◽  
Vol 110 ◽  
pp. 271-0 ◽  
Author(s):  
Se Doo Oh ◽  
Young Ze Lee
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Hard Coatings ◽  
Tribological Characteristics ◽  
Rotary Compressor ◽  
Wear Volume ◽  
Test Results ◽  
Sliding Surfaces ◽  
Natural Refrigerant ◽  
Rotary Type

The tribology of lubricated sliding vanes in the rotary compressor was investigated to replace the HFC refrigerants by the carbon dioxide. The carbon dioxide is a natural refrigerant and very favorable to environment. Because new compressors with the carbon dioxide are going to be operated under the high pressure, the tribology of sliding surfaces in the compressor becomes very important. To develop new compressors, especially rotary type, the friction and wear characteristics of sliding surfaces between a vane and a roller in the rotary compressor were evaluated in this paper. Several hard coatings, such as TiN, CrN, WC/C and two types of nitridings, were applied on vane surfaces in order to improve the tribological characteristics, and their performances were evaluated experimentally. The vane-on-disk type sliding tests were carried out under the various sliding speeds, normal loads, and carbon dioxide pressures with an exclusive high pressure wear tester. From the tests wear volume of vane surfaces applied various coatings were compared. During the tests coefficients of friction and surface temperatures were monitored. Test results showed that WC/C coatings showed good tribological properties. TiN and CrN coated vanes showed good wear resistance properties but produced high friction.

Friction and Wear of Lubricated Sliding Surfaces of Coated Vane and Flange in Rotary Compressor with Carbon Dioxide as a Refrigerant

2007 ◽  
Vol 353-358 ◽  
pp. 1785-1788
Author(s):  
Hong Gyu Jeon ◽  
Kyu Sun Lee ◽  
Sung Oug Cho ◽  
Young Ze Lee
Keyword(s):  
Carbon Dioxide ◽  
Friction And Wear ◽  
Hard Coatings ◽  
Rotary Compressor ◽  
Sliding Surfaces ◽  
Natural Refrigerant ◽  
Air Conditioning Systems ◽  
Friction And Wear Characteristics ◽  
Rotary Type ◽  
Lubricated Sliding

Due to the environmental concerns, especially the greenhouse effect and GWP (Global Warming Potential), the carbon dioxide was investigated as an alternative natural refrigerant to replace HFCs (HydroFluoroCarbons) in refrigerator or air conditioning systems. To develop new compressor, especially rotary type, the friction and wear characteristics of sliding surfaces between vane and flange in the rotary compressor were evaluated in this paper. Several hard coatings, such as TiN, CrN and WC/C, were applied on vane surfaces in order to improve the tribological characteristics, and their performances were evaluated experimentally. The vane-on-flange type lubricated sliding tests were performed with a high pressure wear tester using HFC (R410A) and carbon dioxide. From the tests, wear volumes of vane surfaces applied with various coatings were compared each other.

Calculation of Stresses and Slip in Structural Layers of Unbonded Flexible Pipes

1987 ◽  
Vol 109 (3) ◽  
pp. 263-269 ◽  
Author(s):  
J. J. Fe´ret ◽  
C. L. Bournazel
Keyword(s):  
High Pressure ◽  
Life Expectancy ◽  
Friction And Wear ◽  
Test Results ◽  
Relative Slip ◽  
Steel Pipes ◽  
Flexible Pipes ◽  
Unbonded Flexible Pipes ◽  
Contact Pressures

This paper deals with the behavior of high-pressure unbonded flexible steel pipes which can be used as risers in offshore applications. It concerns primarily the behavior of the internal structure of the pipe. A theoretical approach allows to establish simple formulas for evaluating: the stresses, and the contact pressures between layers due to axisymmetrical loads; the stresses due to bending; the relative slip between layers due to bending. This is a first step towards the evaluation of the life expectancy of flexible pipes. It must be completed by the determination of friction and wear factors through test results.

FRICTION PROCESSES OF SELECTED POLYMERS SLIDING ON STEEL AND DURALUMIN IN A LUBRICANT ENVIRONMENT

Tribologia ◽  
2016 ◽  
Vol 268 (4) ◽  
pp. 201-210 ◽  
Author(s):  
Wojciech WIELEBA ◽  
Tadeusz LEŚNIEWSKI ◽  
Darhan ELEMES ◽  
Ainur ELEMES
Keyword(s):  
Friction And Wear ◽  
Friction Pair ◽  
Polymeric Materials ◽  
Test Results ◽  
Hydraulic Systems ◽  
Sliding Surfaces ◽  
Sliding Motion ◽  
316L Steel ◽  
Gear Pumps ◽  
Engineering Polymers

The article presents the results of tribological research into engineering polymers (POM, PEEK, PPS) cooperating in sliding motion with 316L steel and EN AW-2017A aluminium alloy in the presence of a liquid (water, hydraulic oil HLP68). This type of friction pair may occur in hydraulic systems (gear pumps, valves, etc.). For comparison, additionally, the results of tribological research carried out in dry friction conditions have been shown. In addition, the results of microscopic study of the sliding surfaces of polymeric materials have been presented. Analysis of the test results allows one to describe the processes of friction and wear of the studied sliding pairs.

Selection of Pantograph Strip/Contact Wire Couples in Catenary/Pantograph System

2011 ◽  
Vol 347-353 ◽  
pp. 647-650
Author(s):  
Tao Ding ◽  
Guang Xiong Chen ◽  
Shu Fen Xiao ◽  
Li Xie
Keyword(s):  
Stainless Steel ◽  
Friction And Wear ◽  
Pure Copper ◽  
Wear Volume ◽  
Test Results ◽  
Contact Wire ◽  
Pure Carbon ◽  
Pin On Disc ◽  
Properties Of Materials ◽  
Selection Of

A serials of experiments were carried on the pin-on-disc friction and wear tester. The friction and wear behaviors of on four materials couple with electric current were studied on in different conditions. The result indicates that properties of materials couple have a significant influence on the test results. The friction coefficient is the highest in process of the copper-impregnated metallized carbon rubbing against pure copper couple, and its wear volume of carbon strip material is also the largest. However, the friction and wear volume of copper-impregnated metallized carbon/stainless steel and pure carbon/pure copper couples are lower. Therefore, both friction couples are appropriate for pantograph strip/contact wire couple.

High Temperature Tribological Performance of Steel/Copper Friction Pairs Lubricated With a Modified C-WS2-(Fe3O4+TiN) Nanoadditives in Non-Copper Coated Solid Wires

2021 ◽  
Author(s):  
Hong Li ◽  
Jing Zhu ◽  
Yu Zhang ◽  
Zhuoxin Li ◽  
Bo Meng
Keyword(s):  
High Temperature ◽  
Friction And Wear ◽  
Ball Bearing ◽  
Tribological Performance ◽  
Wear Volume ◽  
Test Results ◽  
Nanoparticle Concentration ◽  
Tribological Test ◽  
Average Coefficient ◽  
Worn Surface

Abstract In this study, four kinds of nanoparticles: graphite, WS2, Fe3O4 and TiN were used as lubricating additives for steel/copper friction pairs to solve the problem of welding contact tube wear with non-copper-coated solid wire at high temperature. The single and composite nanoparticles have excellent dispersion stability in absolute ethanol under the action of the compound surfactant NaSTA+OA+PVP. The tribological test results showed that the maximum decrement with reference to the average coefficient of friction and wear volumes were measured with nanoparticle concentration in 1:1:1 ratio at 300℃. Compared with dry friction, the average friction coefficient and wear volume are reduced by 74.3% and 84.8%, respectively, which may be attributed to the formation of a stable tribo-film mainly composed of C-O, Fe2O3, WO3, TiO2, TiNxOy composite on the worn surface. Therefore, it is considered that the combined lubrication effects of the ball-bearing effect, repairing of worn surfaces and the tribo-film resulted in the lowest friction and wear.

Influence of Test Conditions on Tribological Behavior

2005 ◽  
Author(s):  
M. Woydt ◽  
J. Ebrecht
Keyword(s):  
Friction And Wear ◽  
Tribological Behavior ◽  
Wear Volume ◽  
Test Results ◽  
Load Step ◽  
Wear Scar Diameter ◽  
Machine Model ◽  
Test Conditions ◽  
Step Interval ◽  
Cleaning Solvents

A series of cooperative interlaboratory tests (RR, round robins) was conducted annuallly from 1997 to 2005 by the DIN 51834 Working Group on Tribological Tests using a Translatory Oscillation Apparatus (SRV™®) in cooperation with ASTM D02. The statistical analysis of these test results shows the influence of cleaning solvent and seizure criteria on the tribological properties regarding O.K.-load of the lubricants tested. Coefficients of friction and wear results are ranked according to the effects of ten different cleaning solvents, where isopropanol gave the lowest values and isoparaffin solvents the highest. The wear volume is more descriptive than the wear scar diameter. The effect of machine model on coefficients of friction varied from about 0.2% to 0.9% of mean. Wear results were not affected. The load step interval of 1, 3 or 6 minutes influences the pass load of solid bonded films.

Sign in / Sign up

Export Citation Format

Share Document