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.

Real Area of Contact in a Soft Transparent Interface by Particle Exclusion Microscopy

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
Kyle D. Schulze ◽  
Alex I. Bennett ◽  
Samantha Marshall ◽  
Kyle G. Rowe ◽  
Alison C. Dunn
Keyword(s):  
Flexible Electronics ◽  
Soft Matter ◽  
Colloidal Particles ◽  
Contact Region ◽  
Real Contact Area ◽  
The Real ◽  
Real Area Of Contact ◽  
Static Indentation ◽  
Real Area

Soft matter mechanics are characterized by high strains and time-dependent elastic properties, which complicate contact mechanics for emerging applications in biomedical surfaces and flexible electronics. In addition, hydrated soft matter precludes using interferometry to observe real areas of contact. In this work, we present a method for measuring the real area of contact in a soft, hydrated, and transparent interface by excluding colloidal particles from the contact region. We confirm the technique by presenting a Hertz-like quasi-static indentation (loading time > 1.4 hrs) by a polyacrylamide probe into a stiff flat surface in a submerged environment. The real contact area and width were calculated from in situ images of the interface processed to reduce image noise and thresholded to define the perimeter of contact. This simple technique of in situ particle exclusion microscopy (PEM) may be widely applicable for determining real areas of contact of soft, transparent interfaces.

Real area of contact and friction stress — The role of trapped lubricant

Wear ◽  
1977 ◽  
Vol 43 (1) ◽  
pp. 45-53 ◽  
Author(s):  
T. Nellemann ◽  
N. Bay ◽  
T. Wanheim
Keyword(s):  
Friction Stress ◽  
Real Area Of Contact ◽  
Real Area

Tribological Characteristics of Different Components on C/C-SiC Composites Fabricated by Warm Compacted In Situ Reaction

2012 ◽  
Vol 268-270 ◽  
pp. 59-62
Author(s):  
Zhuan Li ◽  
Peng Xiao ◽  
Xiang Xiong
Keyword(s):  
Wear Rate ◽  
Friction And Wear ◽  
Volume Fraction ◽  
Tribological Performance ◽  
Hard Particle ◽  
The Coefficient Of Friction ◽  
Sic Composites ◽  
Friction And Wear Characteristics

C/C-SiC brake composites, based on reinforcement of carbon fiber and dual matrix of carbon and silicon carbide, were fabricated by warm compacted-in situ reacted process. Rules about the influence of different components on the friction and wear characteristics of the C/C-SiC composites are ascertained. As hard particle, the SiC has the function to the formation of friction film, which is in favor of increasing the coefficient of friction (COF) and decreasing the wear rate. The resin carbon plays the role of enhancing the COF, but they are easy to be cut and increase the wear rate. The graphite plays the lubrication function, and right volume content of graphite is helpful to forming friction film to reduce the wear rate. The C/C-SiC composite fabricated by the warm compacted-in situ reaction can with best tribological performance when the components volume fraction of carbon fibre, SiC, graphite and resin carbon are 15.5%, 37.0%, 22.1% and 20.8%, respectively, which the COF and the wear rate can reach the maximum and the minimun value of 0.44 and 1.1μm/cycle respectively.

A Study of the Relative Surface Conformity Between Two Surfaces in Sliding Contact

1991 ◽  
Vol 113 (4) ◽  
pp. 755-761 ◽  
Author(s):  
Fu-Xing Wang ◽  
P. Lacey ◽  
R. S. Gates ◽  
S. M. Hsu
Keyword(s):  
Surface Roughness ◽  
Computer Program ◽  
Contact Area ◽  
Sliding Contact ◽  
Test Duration ◽  
Lubrication Mechanism ◽  
The Real ◽  
Wear Process ◽  
Real Area Of Contact ◽  
Real Area

The surface roughnesses of two surfaces in a wear contact can change throughout the course of the wear process. This may or may not change the lubrication mechanism of the system depending on the real area of contact as influenced by the changes in the surface roughness. The present work examines the changes in surface roughness within the contact area, as well as the relative mating of the two surfaces. To quantify the similarity between the two wear surfaces, a new concept, the relative surface conformity, has been defined and developed. To effectively measure this parameter, a computer program was written to input the wear scar profilometry traces and to calculate the relative surface conformity of the two. Finally, the relative surface conformity was shown to rise with increasing test duration, during running in.

scholarly journals Tribology of High-performance PEEK-, PI-, and ATSP-based Self-lubricating Polymers Up to 300 oC

2021 ◽  
Author(s):  
Kian Bashandeh ◽  
Pixiang Lan ◽  
Andreas A. Polycarpou
Keyword(s):  
High Performance ◽  
Tribological Performance ◽  
Low Friction ◽  
Transfer Films ◽  
Overall Performance ◽  
Low Wear ◽  
Pin On Disk ◽  
Environmental Temperatures ◽  
Lubricating Properties

Abstract High-performance polymers (HPPs) with self-lubricating properties are promising materials for bearing and tribological components that demand low friction and low wear in the absence of liquid lubrication. This study reports on the tribological performance of three advanced HPPs, namely ATSP-, PEEK-, and PI-based polymer composites. The experiments were performed using pin-on-disk configuration under dry sliding conditions and different environmental temperatures from 25 (room temperature) to 300 °C. The role of temperature on the formation of polymer transfer films on the steel counterpart was investigated using microscopy and profilometric measurements, and correlations were made to their tribological performance. From the three tested composites, ATSP-based composite exhibited the best overall performance with low friction and low wear.

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.

Role of contact frequency on the wear rate of steel in discontinuous sliding contact conditions

Wear ◽  
2006 ◽  
Vol 260 (9-10) ◽  
pp. 1096-1103 ◽  
Author(s):  
C. Navas ◽  
I. García ◽  
Xingpu Ye ◽  
J. de Damborenea ◽  
J.P. Celis
Keyword(s):  
Wear Rate ◽  
Sliding Contact ◽  
Contact Conditions ◽  
Contact Frequency
Sign in / Sign up

Export Citation Format

Share Document