Study on Tribology Characteristic of the Cast Iron Friction Pair in the Self-Repairing Additive and Mechanism Analyzing

2011 ◽  
Vol 239-242 ◽  
pp. 1896-1900
Author(s):  
Yan Hong Yan ◽  
Yu Lin Yang ◽  
Nan Wang
Keyword(s):  
Cast Iron ◽  
Friction Pair ◽  
Testing Machine ◽  
Great Influence ◽  
The Self ◽  
Wear Testing ◽  
Wear Characteristics ◽  
Remarkable Effect ◽  
Frictional Wear ◽  
Self Repair

Influence of frictional wear characteristics of the cast iron-cast iron friction pair were investigated in the Self-repairing Additive with different concentration by using MMU-5G end-face friction and wear testing machine. The capability of generating self-repair coatings on the cast iron tribo-surface was verified in the Self-repairing Additive. The surface images of friction pair and their chemical composition were detected by using SEM and EDS. The result indicates different concentration has a great influence on frictional wear characteristics of friction pair in the Self-repairing Additive. In the self-repairing Additive, the Self-repair coatings are not formed on the cast-iron worn surface; self-repairing Additive has remarkable effect on antifriction and wearing of cast iron.

Influence on Tribology Characteristic of the Steel-Cast Iron Friction Pair under Different Concentration of the Self-Repairing Additive and Mechanism Analyzing

2011 ◽  
Vol 189-193 ◽  
pp. 1085-1090
Author(s):  
Yan Hong Yan ◽  
Yu Lin Yang ◽  
Dan Zhang
Keyword(s):  
Cast Iron ◽  
Friction Pair ◽  
Testing Machine ◽  
Great Influence ◽  
The Self ◽  
Wear Testing ◽  
Wear Characteristics ◽  
Frictional Wear ◽  
Self Repair ◽  
Worn Surface

The influence of frictional wear characteristics were investigated under the Self-repairing Additive condition with different concentration by using MMU-5G end-face friction and wear testing machine. The surface images of friction pair and their chemical composition were detected by using SEM and EDS. The result indicates different concentration has a great influence on frictional wear characteristics of friction pair. The Self-repair coatings are formed on the 45#steel worn surface while nothing on the cast-iron worn surface, study considers that metallographic structure and mechanical performance of cast iron are the prime causation resulting in no Self-repair coatings. Self-repairing Additive of the right concentration has remarkable effect on antifriction and wearing of cast iron.

Research on Lubrication and Wear-Resistant Mechanism of Ni60A/MoS2 Composite Coating

2011 ◽  
Vol 189-193 ◽  
pp. 231-235
Author(s):  
Yun Cai Zhao ◽  
Li Wang
Keyword(s):  
Friction Coefficient ◽  
Composite Coating ◽  
Friction Surface ◽  
Testing Machine ◽  
The Self ◽  
Wear Testing ◽  
Friction Property ◽  
Low Friction ◽  
Coverage Area ◽  
Lubricating Film

The influence of MoS2 lubrication phase on the tribological properties of the Ni60A/MoS2 composite coating was conducted on UMT-2 micro-wear testing machine (USA), discussing the self-lubricating effect and mechanism. The result shows that with the increasing content of MoS2, the friction coefficient of the coating which changed with the increasing content of the MoS2 presents firstly decreases then increases, and the value reach the minimum when the quality percent of MoS2 wrapped with Nickel is 35%. Low-friction property of the Ni60A/MoS2 composite coating is due to the forming of MoS2 lubricating film in friction surface. The decreasing of the friction coefficient of the coating is in proportion to the coverage area of MoS2 lubricating film.

Simulation of Cylinder Bore Surface Finish Parameters to Improve Laboratory-Scale Friction Tests in New and Used Diesel Oil

2001 ◽  
Author(s):  
Peter J. Blau
Keyword(s):  
Cast Iron ◽  
Surface Finish ◽  
Testing Machine ◽  
Cylinder Liner ◽  
Laboratory Scale ◽  
Engine Oil ◽  
Wear Testing ◽  
Average Roughness ◽  
Arithmetic Average ◽  
Cylinder Bore

Abstract The development of alloys, coatings, surface treatments, and lubricants for improved cylinder liners and rings has historically included friction and wear testing. The correlation of results from motored engines or laboratory-scale tribotests with those from full-scale, fired engines remains a subject of contention. Attempts to develop valid engine wear simulators have met with varying degrees of success. Complexities in understanding and duplicating the relevant contact conditions in fired engines have challenged the designers of sub-scale, simulative laboratory tests. The current paper describes one aspect of this problem; namely, simulating the cylinder bore surface finish for use in bench tests. A rapid method to prepare cast iron test specimens that have similar surface roughness parameters to a production cast iron cylinder liner has been developed. To compare the sliding response of simulated liners with actual liners, cast iron specimens were friction-tested in both new and used 15W40 commercial diesel engine oil, in mineral oil, and without liquid lubrication. A reciprocating, ball-on-flat testing machine was used with test lengths that ranged from 100 to 20,000 cycles. Kinetic friction coefficient data compared favorably between the simulated cylinder liner specimens and actual cylinder liner segments. The friction coefficients obtained in tests with different lubricants on the simulated surfaces were related through a second-degree polynomial to the change in arithmetic average roughness that occurred during running-in. Additional elements of the fired engine environment will be added in the next stages of this research to determine the degree of complexity that is needed to obtain increasingly better simulations.

Frictional Performance of an Ionic Liquid/Graphene Composite Additive in Lubricating Oil

NANO ◽  
2021 ◽  
pp. 2150111
Author(s):  
Shengli You ◽  
Ming Zhou ◽  
Mingyue Wang ◽  
Xin Chen ◽  
Long Jin ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Friction Pair ◽  
Testing Machine ◽  
Steel Ball ◽  
Wear Scar ◽  
Wear Testing ◽  
Lubricating Oil ◽  
Wear Scar Diameter ◽  
Base Oil ◽  
Frictional Performance

In this study, we used a four-ball friction and wear testing machine to test the tribological properties of [HPy]BF4 ionic liquids (ILs), low-layer graphene (G), and IL and G compounds (IL/G) as lubricant additives at variousconcentrations, loads, and speeds. The morphology of the wear scar was characterized by a white-light interferometer and a scanning electron microscope (SEM). The results showed that the optimal concentrations of IL and G were 0.10[Formula: see text]wt.% and 0.05[Formula: see text]wt.%, respectively. When the IL concentration was 0.10[Formula: see text]wt.%, the friction coefficient and the wear scar diameter (WSD) reduced by approximately 18% and 8%, respectively, compared to the base oil. When the concentration of G was 0.05[Formula: see text]wt.%, the friction coefficient and WSD reduced by approximately 23% and 12%, respectively, compared to the base oil. After adding the optimal concentration of the IL/G composite additive under the same test conditions, the average friction coefficient of the steel ball reduced by approximately 30%, and the average WSD reduced by approximately 18%. IL/G nanoadditives could be easily attached to the pit area on the friction surface of the steel ball, which made the contact surface of the friction pair smoother and the area of the oil film bearing the load larger, compared to those using the base oil. These two combined phenomena promoted synergistic antifriction and antiwear effects, which significantly improved the frictional performance of the base oil.

Effect of Subsurface Deformation on Sliding Wear Behavior of Ti-29Nb-13Ta-4.6Zr Alloys for Biomedical Applications

2014 ◽  
Vol 616 ◽  
pp. 270-274
Author(s):  
Yoon Seok Lee ◽  
Mitsuo Niinomi ◽  
Masaaki Nakai ◽  
Kengo Narita ◽  
Junko Hieda ◽  
...  
Keyword(s):  
Wear Mechanisms ◽  
Wear Behavior ◽  
Testing Machine ◽  
Wear Test ◽  
Wear Testing ◽  
Wear Properties ◽  
Delamination Wear ◽  
Frictional Wear ◽  
Fixation Devices ◽  
Spinal Fixation Devices

The wear mechanisms of conventional Ti–6Al–4V extra-low interstitial (Ti64) and the new Ti–29Nb–13Ta–4.6Zr (TNTZ) were studied to investigate the wear properties of Ti64/TNTZ for application in spinal fixation devices. Ti64 and TNTZ balls and discs were first prepared as wear-test specimens. A ball-on-disc frictional wear-testing machine was used in air to perform the frictional wear tests of the Ti64 and TNTZ discs mated against Ti64 and TNTZ balls. The wear mechanisms were investigated using a scanning electron microscopy to analyze the worn surfaces and wear debris. The volume losses for the TNTZ discs were larger than those for the Ti64 ones, regardless of the mating ball material. Furthermore, the morphologies of the wear tracks and the debris of the Ti64 and TNTZ discs were different, suggesting that the wear mechanisms for the Ti64 and TNTZ discs were abrasive and delamination wear caused by mild and severe subsurface deformations of the Ti64 and TNTZ, respectively, regardless of the mating ball material.

Design of Data Acquisition System in Friction Wear Testing Machine Based on Virtual Instrument LabVIEW

2014 ◽  
Vol 556-562 ◽  
pp. 1332-1337
Author(s):  
Li Xin Wang ◽  
Li Gang Zhai ◽  
Ya Yan Gao
Keyword(s):  
Data Acquisition ◽  
Virtual Instrument ◽  
Friction Pair ◽  
Testing Machine ◽  
Data Acquisition System ◽  
Normal Pressure ◽  
Acquisition System ◽  
Wear Testing ◽  
Data Acquisition Card ◽  
Demand Information

Friction wear testing machine is generally used in researches of various friction wear mechanisms, explorations of influences factors, and property evaluations of friction pair materials. Measurement accuracy and automation level of the friction wear testing machine directly influence the precision of data acquisition and analysis processing, as well as the intuition of data displaying. Based on virtual instrument LabVIEW, a data acquisition system of friction wear testing machine was developed. Hardware of this data acquisition system mainly consists of sensors utilized as acquiring information on rotate speed, normal pressure, friction force and temperature, as well as signal conditioning module and data acquisition card. Utilizing the LabVIEW, data processing and interface displaying software was programmed. Debugging results confirmed that the developed system can accurately acquire the demand information when operating the friction wear testing machine, also intuitively display these obtained information in real-time. Therefore, the developed data acquisition system satisfies the demand of precisely acquiring information related to friction wear testing of experimental materials.

scholarly journals Rolling Mild Wear of Gray Cast Iron-Study by Amsler Wear Testing Machine

1972 ◽  
Vol 36 (6) ◽  
pp. 571-576 ◽  
Author(s):  
Hiroya Kaieda ◽  
Takeshi Sano ◽  
Akitoshi Yoshimochi
Keyword(s):  
Cast Iron ◽  
Gray Cast Iron ◽  
Testing Machine ◽  
Wear Testing ◽  
Gray Cast ◽  
Mild Wear
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