A Fundamental Tribological Study of Ti/Al2O3 Contact in Sliding Wear

1989 ◽  
Vol 111 (3) ◽  
pp. 504-509 ◽  
Author(s):  
H. Hong ◽  
W. O. Winer
Keyword(s):  
Wear Rate ◽  
Single Crystal ◽  
Chemical Reaction ◽  
Tribological Properties ◽  
Wear Mechanism ◽  
Theoretical Approach ◽  
Sliding Wear ◽  
Sliding Contact ◽  
Tribological Study ◽  
Friction Heating

The tribological properties of titanium in sliding contact with single crystal Al2O3 were studied to investigate wear mechanism associated with tribo-chemical reaction due to friction heating. Oxidational wear was observed. A theoretical approach to predict the wear rate of titanium was also studied.

Wear Behavior of Laser-Hardened GCr15 Steel under Lubricated Sliding Conditions

2009 ◽  
Vol 628-629 ◽  
pp. 697-702 ◽  
Author(s):  
Sheng Lei ◽  
Quan Kun Liu ◽  
Yu Ping Liu ◽  
Heng Li
Keyword(s):  
Wear Resistance ◽  
Surface Modification ◽  
Wear Rate ◽  
Tribological Properties ◽  
Wear Mechanism ◽  
Sliding Wear ◽  
Laser Surface ◽  
Ferrous Alloys ◽  
Gcr15 Steel ◽  
Lubricated Sliding

Microstructure, microhardness and tribological properties of laser hardened GCr15 steel were investigated in this paper. The wear resistance under lubricated sliding conditions was compared between specimens treated with laser and those of conventionally hardened. The tribological properties of laser surface-quenched GCr15 steel specimens were slightly better due to the effects of the microstructure hardening, high hardness and toughness, with the wear rate (in the order of 10-6mg/Nm) lower than that of the conventionally treated specimens. At the steady state, the frictional coefficient of laser-treated samples had no obvious difference from that of the conventionally treated samples. The wear mechanism for both cases was similar, generally involved surface fatigue wear and slight abrasion wear. LeiQ.K. Liu S. Lei Introduction H. Li In recent years, among the various surface modification methods, laser-induced surface modification has gained much attention for achieving the desired properties for applications[1]. This method is mainly used for ferrous alloys which undergo martensitic transformation and thus form a very hard surface layer with negligible surface roughness and distortion[2]. Some ideas demonstrated that the wear rate at a particular contact pressure can be strongly influenced by the microstructure of the steel, but there is also contrary idea that under the conditions of mild wear, the microstructural constituents of steels have no significant influence on the wear rate, although they affect the rate of severe wear. Previous studies of the authors demonstrated that under the dry sliding wear conditions, laser surface-hardened specimens of ferrous alloys exhibited enhanced wear resistance than conventionally hardened specimens. The aim of the study is to investigate the lubricated sliding wear behaviors of laser surface hardened GCr15 steel specimens and to compare the effect of the different microstructure compositions for laser transformation hardening with those of conventionally hardened and quenched. Moreover, the wear properties of the GCr15 steel and its corresponding wear mechanism under the lubricated wear conditions will also be studied.

A Tribological Study of Mo/Al2O3 in Sliding Contact

1988 ◽  
Vol 140 ◽  
Author(s):  
Hyun-Soo Hong ◽  
Ward O. Winer
Keyword(s):  
Wear Rate ◽  
Molybdenum Oxide ◽  
Sliding Contact ◽  
Tribological Study ◽  
Real Area Of Contact ◽  
Low Wear ◽  
Real Area ◽  
Lubricating Properties

AbstractThis is Part II of a tribological study of metal/ceramic pair in a sliding contact. The tribological behavior of molybdenum against a single crystal A12O3 was investigated at bulk temperatures of 23ºC and 400ºC using a sliding speed of 4 m/s and loads from nine to twenty five Newtons. The role of oxidational wear was confirmed at both temperatures. The linear dependency of wear rate on load was identified at 23ºC tests. At 400ºC, there was a rapid increase of wear rate at a load of about 25 N possibly due to the volatilization of MoO3, which is the limitation of molybdenum oxide as a solid lubricant. However, this study showed that the out-of-contact oxide formation may have prevented the catastrophic oxidation during contact at the real area of contact. It also showed that in-situ formed molybdenum oxide has good lubricating properties (≃ 0.3) and a low wear rate (≃ 10-14 m3/m). Therefore, this molybdenum can be used for a large range of sliding speeds and loads.

A Sliding Wear Model for Partial-EHL Contacts

1991 ◽  
Vol 113 (1) ◽  
pp. 134-141 ◽  
Author(s):  
Shifeng Wu ◽  
H. S. Cheng
Keyword(s):  
Wear Rate ◽  
Wear Mechanism ◽  
Sliding Wear ◽  
Contact Region ◽  
Contact Temperature ◽  
Hertzian Contact ◽  
Asperity Contact ◽  
Wear Model ◽  
Actual Surface ◽  
Transitional Phenomenon

A sliding wear model has been developed for partial-EHL contacts, in which both the thermal desorption wear mechanism at low asperity contact temperature and the oxidative wear mechanism at elevated asperity contact temperature are considered. To include micro-EHL effects, digitized actual surface roughness profiles are used in simulating two contacting rough surfaces, and in obtaining the asperity contact area and asperity contact temperature distributions within a Hertzian contact region. Wear measurements in a two-disk machine configuration have been made over a comprehensive range of slide-to-roll ratios. The experimental results show a continuous decrease in wear rate with the increase in slide-to-roll ratio when the slide-to-roll ratio is relatively small, and a drastic rise in wear rate when slide-to-roll ratio is further increased. The experimental wear rate curve as a function of slide-to-roll ratio verifies the model prediction. The drastic rise in wear rate with the increase in slide-to-roll ratio in the range of slide-to-roll ratio beyond unity seems to suggest that a transitional phenomenon exists in the relation between wear rate and slide-to-roll ratio.

Sliding Wear and Metal Transfer Under Unlubricated Conditions

1959 ◽  
Vol 81 (1) ◽  
pp. 67-77 ◽  
Author(s):  
R. P. Steijn
Keyword(s):  
Wear Rate ◽  
Wear Mechanism ◽  
Surface Finish ◽  
Sliding Wear ◽  
Metal Transfer ◽  
Hardened Steel ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Finish Material ◽  
Back Transfer

To provide further information on dry sliding wear and the accompanying metal transfer, wear experiments of radioactive brass rings against hardened steel have been conducted in a ring tester. The effect on metal transfer of sliding speed, surface finish, material of the harder surface, and the presence of slots in the steel ring have been investigated. Tests have also been conducted in argon atmospheres to exclude oxidation. Wear of brass on brass has been investigated by using radioactive rings against inactive rings. Results indicate a complex wear mechanism in which transfer, back transfer, and removal of transferred material are intermediate steps, and in which the determining step in wear rate is governed by the geometry of the rings rather than the apparent area of contact.

THE IMPORTANCE OF PRIMARY CARBIDES FOR THE TRIBOLOGICAL PROPERTIES OF FERROUS ALLOYS

Tribologia ◽  
2016 ◽  
Vol 270 (6) ◽  
pp. 69-81 ◽  
Author(s):  
Janusz KRAWCZYK ◽  
Łukasz FROCISZ ◽  
Adam KOKOSZA ◽  
Edyta ROŻNIATA ◽  
Rafał DZIURKA ◽  
...  
Keyword(s):  
Tribological Properties ◽  
Wear Mechanism ◽  
Sliding Wear ◽  
Volume Fraction ◽  
Ferrous Alloys ◽  
Fatigue Wear ◽  
Tool Materials ◽  
Materials Used ◽  
Primary Carbides

Among the materials used for the mill rolls, one of the main groups are materials with eutectoid primary carbides in their microstructure. The volume fraction and morphology of these carbides influent in a significant way on the tribological properties of tool materials. In the paper, the role of the primary carbides morphology on the fatigue wear of mill rolls after exploitation was presented. The role of the primary carbides morphology in the sliding wear of tool materials was also investigated. The evaluation of the sliding wear mechanism and its degree was performed by the investigation of the mill rolls surface roughness after exploitation. Whereas, the role of ledeburite cementite morphology in wear mechanism changes ware investigated by the laboratory tests. Tests were performed with the use of different loads, time, and temperature during the trials. The microcutting of counter sample material by the primary carbides from the tested samples was observed.

Wear Behaviour of Al-1050 Alloy Processed by Severe Plastic Deformation

2010 ◽  
Vol 667-669 ◽  
pp. 1101-1106 ◽  
Author(s):  
Chuan Ting Wang ◽  
Nong Gao ◽  
Robert J.K. Wood ◽  
Terence G. Langdon
Keyword(s):  
Plastic Deformation ◽  
Wear Resistance ◽  
Wear Rate ◽  
Wear Mechanism ◽  
Sliding Wear ◽  
Wear Behaviour ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Oxidation Wear ◽  
Wear Tests

An Al-1050 alloy was processed by ECAP and HPT, respectively. Dry sliding wear tests were conducted on the as-received and SPD-processed samples under various sliding conditions. A comparison of wear rate indicated that SPD processing decreased the wear resistance. Two main wear mechanisms were observed. The initial wear stage was dominated by severe platelet wear mechanism and later wear was dominated by an oxidation wear mechanism. The results show the severe wear stage of SPD-processed Al-1050 is much longer than that of the as-received Al-1050, which is attributed to the loss of work hardening capacity after SPD processing.

Microstructure and Tribological Properties of a Ni-Base Laser Cladding on Aluminum Bronze

2010 ◽  
Vol 160-162 ◽  
pp. 100-105
Author(s):  
Jian Lin Xu ◽  
Bo Yang ◽  
Chun Yan Ju ◽  
Li Hui Zhang
Keyword(s):  
Wear Rate ◽  
Abrasive Wear ◽  
Laser Cladding ◽  
Tribological Properties ◽  
Wear Mechanism ◽  
Dry Friction ◽  
Wear Behavior ◽  
Solidification Rate ◽  
Aluminum Bronze ◽  
Lubricate Condition

In the paper, a Ni-base composite cladding was cladded on the surface of QAl9-4 aluminum bronze by laser cladding technology, as well as its microstructure and tribological properties are studied. The results show that the microstructure of laser cladding is affected by solidification rate, and its wear behavior mainly lies on microstructure and lubrication condition. The microstructure of laser cladding is made up of cellular crystal and dendrite crystal. The microstructure of the surface cladding is cellular crystal, the middle section is crassitude dendrite crystal, and the bottom is coarse dendrite crystal and cellular crystal. Under dry friction condition, wear mechanism is abrasive wear and shedding strengthen phase, which has higher volume’s wear rate. Under lubricate condition, wear mechanism is abrasive wear and adhere wear, which has lower volume’s wear rate than that of dry friction. The average friction coefficient of the cladding under dry and lubricate condition are 0.39 and 0.15, the volume’s wear rate are 7.88×10-8mm3/N.mm and 1.56×10-9mm3/ N.mm, respectively. Therefore, the cladding has favorable wear resistance property under lubricate condition，and can be used as an excellent wearable material.

Conjoint Action of CO2 Corrosion and Reciprocating Sliding Wear on Plain Carbon Steel Part II — Electrochemical Studies

CORROSION ◽  
1992 ◽  
Vol 48 (12) ◽  
pp. 1027-1031 ◽  
Author(s):  
A. Hedayat ◽  
J. Postlethwaite ◽  
S. Yannacopoulos
Keyword(s):  
Carbon Steel ◽  
Wear Rate ◽  
Corrosion Inhibitor ◽  
Contact Pressure ◽  
Sliding Wear ◽  
Plain Carbon Steel ◽  
Sliding Contact ◽  
Metal Loss ◽  
Co2 Corrosion ◽  
Corrosion Rates

Abstract The presence of sliding contact between metals in a corrosive medium significantly affects the metal loss rate of the surfaces in contact. In this study, corrosion tests were carried out on plain carbon steel undergoing sliding wear in CO2 saturated 3%NaCl solution with and without an amine corrosion inhibitor. Corrosion rates of the sliding surfaces were estimated using the polarization resistance technique. Sliding wear tests were carried out using steel specimens sliding against each other and steel specimens sliding against corundum specimens both continuously and intermittently. The corrosion rates of the specimens increased with the increase in contact pressure in the presence and absence of the corrosion inhibitor. The inhibitor decreased the corrosion rates for all of the specimens throughout the range of applied contact pressure. The corrosion rates of the specimens subjected to continuous sliding contact were higher than those undergoing intermittent sliding contact. The wear rate of a continuously sliding specimen in the absence of corrosion was determined by the application of cathodic protection and compared to the corrosion rate and the corrosion wear rate under the same loading conditions. The relative contributions of corrosion and wear to the overall metal loss are discussed.

Experimental study on the effect of surface texture on tribological properties of nanodiamond films under water lubrication

2021 ◽  
pp. 135065012110334
Author(s):  
Ying Yan ◽  
Xuelin Lei ◽  
Yun He
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Tribological Properties ◽  
Surface Texture ◽  
Diamond Film ◽  
Diamond Films ◽  
Nanocrystalline Diamond ◽  
Water Contact ◽  
Texture Density ◽  
Short Run

The effect of nanoscale surface texture on the frictional and wear performances of nanocrystalline diamond films under water-lubricating conditions were comparatively investigated using a reciprocating ball-on-flat tribometer. Although the untreated nanocrystalline diamond film shows a stable frictional state with an average friction coefficient of 0.26, the subsequent textured films show a beneficial effect on rapidly reducing the friction coefficient, which decreased to a stable value of 0.1. Furthermore, compared with the nanocrystalline diamond coating, the textured films showed a large decreasing rate of the corresponding ball wear rate from 4.16 × 10−3 to 1.15 × 10−3 mm3/N/m. This is due to the fact that the hydrodynamic fluid film composed of water and debris can provide a good lubrication environment, so the entire friction process has reached the state of fluid lubrication. Meanwhile, the surface texture can greatly improve the hydrophilicity of the diamond films, and as the texture density increases, the water contact angle decreases from 94.75° of the nanocrystalline diamond film to 78.5° of the textured films. The proper textured diamond film (NCD90) exhibits superior tribological properties among all tested diamond films, such as short run-in period, low coefficient of friction, and wear rate.

scholarly journals Sliding Wear of Conventional and Suspension Sprayed Nanocomposite WC-Co Coatings: An Invited Review

2021 ◽  
Author(s):  
R. Ahmed ◽  
O. Ali ◽  
C. C. Berndt ◽  
A. Fardan
Keyword(s):  
Wear Rate ◽  
Thermal Spray ◽  
Sliding Wear ◽  
Failure Modes ◽  
Thermal Spray Coatings ◽  
Annual Growth Rate ◽  
Total Energy Consumption ◽  
Wear Performance ◽  
Wear Rates ◽  
Spray Coatings

AbstractThe global thermal spray coatings market was valued at USD 10.1 billion in 2019 and is expected to grow at a compound annual growth rate of 3.9% from 2020 to 2027. Carbide coatings form an essential segment of this market and provide cost-effective and environmental friendly tribological solutions for applications in aerospace, industrial gas turbine, automotive, printing, oil and gas, steel, and pulp and paper industries. Almost 23% of the world’s total energy consumption originates from tribological contacts. Thermal spray WC-Co coatings provide excellent wear resistance for industrial applications in sliding and rolling contacts. Some of these applications in abrasive, sliding and erosive conditions include sink rolls in zinc pots, conveyor screws, pump housings, impeller shafts, aircraft flap tracks, cam followers and expansion joints. These coatings are considered as a replacement of the hazardous chrome plating for tribological applications. The microstructure of thermal spray coatings is however complex, and the wear mechanisms and wear rates vary significantly when compared to cemented WC-Co carbides or vapour deposition WC coatings. This paper provides an expert review of the tribological considerations that dictate the sliding wear performance of thermal spray WC-Co coatings. Structure–property relationships and failure modes are discussed to grasp the design aspects of WC-Co coatings for tribological applications. Recent developments of suspension sprayed nanocomposite coatings are compared with conventional coatings in terms of performance and failure mechanisms. The dependency of coating microstructure, binder material, carbide size, fracture toughness, post-treatment and hardness on sliding wear performance and test methodology is discussed. Semiempirical mathematical models of wear rate related to the influence of tribological test conditions and coating characteristics are analysed for sliding contacts. Finally, advances for numerical modelling of sliding wear rate are discussed.

Sign in / Sign up

Export Citation Format

Share Document