Self-Lubricating and Wear Resistant Epoxy Composites Incorporated With Microencapsulated Wax

2014 ◽  
Vol 81 (7) ◽  
Author(s):  
N. W. Khun ◽  
H. Zhang ◽  
C. Y. Yue ◽  
J. L. Yang
Keyword(s):  
Tribological Properties ◽  
Friction And Wear ◽  
Normal Load ◽  
Wear Test ◽  
Epoxy Composites ◽  
Wear Resistant ◽  
Working Parameters

Self-lubricating and wear resistant epoxy composites were developed via incorporation of wax-containing microcapsules. The effects of microcapsule size and content and working parameters on the tribological properties of epoxy composites were systematically investigated. The incorporation of microcapsules dramatically decreased the friction and wear of the composites from those of the epoxy. The increased microcapsule content or the incorporation of larger microcapsules decreased the friction and wear of the epoxy composites due to the larger amount of released wax lubricant via the rupture of microcapsules during the wear test. The friction of the composites decreased with increased normal load as a result of the promoted wear of the composites and the increased release of the wax lubricant.

scholarly journals Effect of Self-Generated Transfer Layer on the Tribological Properties of PTFE Composites Sliding against Steel

Coatings ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 399 ◽  
Author(s):  
Ting Xie ◽  
Shihao Feng ◽  
Yongheng Qi ◽  
Ailong Cui
Keyword(s):  
Friction Coefficient ◽  
Layer Thickness ◽  
Tribological Properties ◽  
Normal Load ◽  
Wear Test ◽  
Wear Volume ◽  
Functional Requirements ◽  
Transfer Layer ◽  
Sliding Speed ◽  
Ptfe Composites

Coatings are normally employed to meet some functional requirements. There is a kind of self-generated coating during use, such as the transfer layer during sliding, which may greatly affect the tribological behavior. Although the transfer layer has aroused much attention recently, the formation of the transfer layer closely depends on the service conditions, which need to be further studied. In this paper, the effects of sliding speed, normal load, and duration of wear test on the transfer layer thickness during friction of Ni/PTFE (Polytetrafluoroethylene) composites were experimentally investigated. The formation mechanism of transfer layer and the relationships between tribological properties and transfer layer thickness were analyzed in detail. It was found that the transfer layer thickness increased with increases of sliding speed and normal load; and after a period of wear test, the transfer layer thickness remained stable. The transfer layer thickness correlates linearly with the friction coefficient and wear volume of the PTFE composites. With the increase of the transfer layer thickness, the friction coefficient decreased, while the wear volume increased, which means that a uniform, thin, and stable transfer layer is beneficial for the reduction of friction and wear of the polymeric composites.

scholarly journals Evaluation of Friction and Wear Behavior of Date Palm Fruit Syrup as an Environmentally Friendly Lubricant

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1589 ◽  
Author(s):  
Mazin Tahir ◽  
Abdul Samad Mohammed ◽  
Umar Azam Muhammad
Keyword(s):  
Tribological Properties ◽  
Friction And Wear ◽  
Date Palm ◽  
Wear Behavior ◽  
Normal Load ◽  
Environmentally Friendly ◽  
Potential Candidate ◽  
Palm Fruit ◽  
Wear Rates ◽  
The Coefficient Of Friction

The effect of various operational factors, such as sliding speed, normal load and temperature on the tribological properties of Date palm fruit syrup (DPFS) as an environmentally friendly lubricant, is investigated. Ball-on-disc wear tests are conducted on mild steel samples in the presence of DPFS as a lubricant under different conditions and the coefficient of friction and wear rate are measured. Scanning electron microscopy, stylus profilometry, and Fourier transform infrared spectroscopy are used to evaluate the wear tracks to determine the underlying wear mechanisms. Results showed that DPFS has excellent tribological properties in terms of low friction and low wear rates making it a potential candidate to be used as a lubricant in tribological applications.

Effects of Concentration of Alkaline Treated SF on the Tribological Properties of POM Composites Filled with LDPE and Sisal Fibers

2011 ◽  
Vol 415-417 ◽  
pp. 94-99
Author(s):  
Ding Han Xiang ◽  
Wen Juan Li ◽  
Jiao Ling Ma
Keyword(s):  
Tribological Properties ◽  
Friction And Wear ◽  
Impact Test ◽  
Adhesive Wear ◽  
Wear Test ◽  
Alkaline Treatment ◽  
Mechanical And Tribological Properties ◽  
Naoh Solution ◽  
Sisal Fibers ◽  
Test Impact

Polyoxymethylene (POM) composites filled with low-density polyethylene (LDPE) and sisal fibers (SF) were prepared by extrusion and injection molding. Sisal fibers were treated by various concentrations of NaOH solution to improve the poor compatibility between SF and matrix. Fourier transform infrared spectroscopy (FTIR) analysis and scanning electron microscope (SEM) test were used to confirm the surface treatment. The effects of SF alkaline treatment on the mechanical and tribological properties of POM composites were determined by using tensile test, impact test and friction and wear test. The worn surfaces of composites were investigated by SEM. Results showed that the composite filled with 12.5% NaOH treated SF exhibited the optimal mechanical and tribological properties among the all composites. The major wear mechanism of the composites was adhesive wear and abrasive grain wear.

Design and development of a new portable test setup to study friction and wear

2019 ◽  
Vol 234 (5) ◽  
pp. 730-742
Author(s):  
Anahita Emami ◽  
Seyedmeysam Khaleghian ◽  
Tyler Bezek ◽  
Saied Taheri
Keyword(s):  
Friction And Wear ◽  
Sliding Friction ◽  
Normal Load ◽  
Substrate Surface ◽  
Wear Test ◽  
Wear Testing ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Sample Holder ◽  
Test Setup

In this paper, a novel portable sliding friction and wear test rig is introduced. Unlike other laboratory-based test setups, this setup can be used for both indoor and outdoor experiments. There is also no limitation on the size and type of the substrate surface that can be used for the friction and wear test in contrast to typical test rigs, which have some limitations for the size and type of substrate surface. A small six-wheel ground robot is developed to drag the sample on an arbitrary surface for a desired distance and velocity. A ground robot is an unmanned ground vehicle, capable of driving on the ground without humans on board. The speed of this robot can be measured and controlled precisely. The nominal normal load is adjusted using dead weights placed on the sample holder and the friction force is measured using a load cell. An adjustable sample holder was also designed and built to hold different-size specimens. The results of styrene–butadiene rubber block sliding on an asphalt track are presented to validate the test setup and illustrate the potential of the system for friction and wear testing. In addition, the effect of sliding velocity on the friction and wear is studied, and the correlation between the wear rate and the friction coefficient is investigated. These experimental results can be used to estimate the friction and life span of a tire tread compound on the real asphalt road. Finally, the formation of abrasion pattern observed on the rubber surface sliding on an asphalt track is discussed, which provides an insight into the understanding of dominant wear mechanism of tire tread compound on typical asphalt surfaces.

Short Carbon Fiber-Reinforced Epoxy Tribomaterials Self-Lubricated by Wax Containing Microcapsules

2014 ◽  
Vol 81 (12) ◽  
Author(s):  
Nay Win Khun ◽  
He Zhang ◽  
Xiu-zhi Tang ◽  
Chee Yoon Yue ◽  
Jinglei Yang
Keyword(s):  
Carbon Fiber ◽  
Mechanical Strength ◽  
Carbon Fibers ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Tribological Performance ◽  
Epoxy Composites ◽  
Short Carbon Fiber ◽  
The Core ◽  
Short Carbon

The effects of wax lubricant filled microcapsule content on the tribological properties of epoxy composites without or with 8 wt.% short carbon fibers (SCFs) were systematically investigated. The core percentage of the microcapsules used in this study was about 70 wt.%. The tribological results clearly showed that the friction and wear of the epoxy composites without or with SCFs tested against a 6 mm steel ball significantly decreased with increased microcapsule content from 2.5 to 10 wt.% as a result of the increased amount of released wax lubricant to lubricate rubbing surfaces. The epoxy composites with 8 wt.% SCFs exhibited the lower friction and wear than the ones without SCFs due to the combined lubricating effects of SCFs and released wax lubricant and the improved mechanical strength of the composites. It can be concluded that the higher microcapsule content gives rise to the lower friction and wear of the epoxy composites as the epoxy composites with 8 wt.% SCFs have the better tribological performance than the ones without SCFs.

Reciprocating Friction and Wear Characteristics of Al Particulate Glass Epoxy Composites

2016 ◽  
Vol 4 (1) ◽  
pp. 25-44
Author(s):  
Pujan Sarkar ◽  
Nipu Modak ◽  
Prasanta Sahoo
Keyword(s):  
Friction And Wear ◽  
Epoxy Composite ◽  
Wear Behavior ◽  
Normal Load ◽  
Weight Fraction ◽  
Epoxy Composites ◽  
Wear Loss ◽  
Compression Moulding ◽  
Wear Characteristics ◽  
Friction And Wear Characteristics

An experimental study has been carried out to investigate the reciprocating friction and wear characteristics of woven glass epoxy composites filled with Al particulate using a reciprocating friction and wear tester. The fiber weight fraction has been kept constant at 60 wt% and Al wt% is varied as 0, 5, 10, and 15%. The composite is fabricated in hand lay-up technique followed by light compression moulding. Friction and wear behavior under dry reciprocating condition has been presented as function of reciprocating distance keeping reciprocating frequency and normal load constant at 30 Hz and 1.0 Kg respectively. Composites having 5 and 10 wt% Al powder exhibit less friction and wear loss as compared to unfilled glass epoxy composite whereas 15 wt% Al filled glass epoxy composite reports highest friction and wear loss. An attempt has been made to observe the distribution of fiber and Al particles in the composite, and to correlate the wear behavior using Scanning Electron Microscopy (SEM) observations.

Tribological properties of Fe-Cr-B alloy for sliding boot in coal mining machine under dry sliding condition

2017 ◽  
Vol 69 (2) ◽  
pp. 142-148 ◽  
Author(s):  
Hongbin Xuan ◽  
Gongjun Cui
Keyword(s):  
Coal Mining ◽  
Tribological Properties ◽  
Wear Mechanism ◽  
Normal Load ◽  
Mining Machine ◽  
Dry Sliding ◽  
Wear Resistant ◽  
Content Type ◽  
Wear Rates ◽  
1045 Steel

Purpose To improve the wear resistance of the sliding boot, the wear-resistant Fe-21 Wt.% Cr-5 Wt.% B alloy is prepared, and the wear mechanism is studied under dry sliding condition. Design/methodology/approach The anti-wear Fe-21 Wt.% Cr-5 Wt.% B alloy is prepared by powder metallurgy technique. The tribological behavior of Fe-Cr-B alloy sliding against ASTM 1045 steel pin is studied at 30-60 N and 0.03-0.12 m/s using a reciprocating pin-on-disk tribometer under dry sliding condition. Meanwhile, the ASTM 5140 and 3316 steel are studied as compared samples. Findings The friction coefficients of tested specimens increase with the increasing normal load. However, this effect is the opposite in case of different sliding speeds. The specific wear rates increase as the sliding speed and normal load increase. The Fe-Cr-B alloy shows the best tribological properties under the dry sliding condition and the wear mechanism is mainly ploughing. Originality/value This wear-resistant Fe-21 Wt.% Cr-5 Wt.% B alloy can replace the traditional materials to process the sliding shoes and improve the service life of coal mining machine.

Friction and Wear Behavior of Fe–Cr–B Alloys in Liquid Paraffin Oil

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
Jin Wei ◽  
Gongjun Cui
Keyword(s):  
Plastic Deformation ◽  
Wear Resistance ◽  
Tribological Properties ◽  
Wear Mechanism ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Normal Load ◽  
Liquid Paraffin ◽  
Friction And Wear Behavior ◽  
Paraffin Oil

The tribological properties of Fe–Cr–B alloys were studied sliding against SiC ball in liquid paraffin oil. The boron played an important role in improving tribological properties of alloys. The friction coefficients of alloys decreased with the increase of normal load and sliding speed. The Fe–Cr–B alloys showed better wear resistance than that of Fe–Cr alloy. Fe-21 wt.% Cr-7 wt.% B alloy had the best tribological properties. The wear mechanism of Fe–Cr alloy was abrasive wear and plastic deformation. The wear mechanism of Fe–Cr–B alloys was microploughing and fatigue flaking pits.

Study on antifriction mechanism of lubricating wear-resistant coating with parallel texture

2015 ◽  
Vol 67 (5) ◽  
pp. 418-424 ◽  
Author(s):  
Yuncai Zhao ◽  
Fei Yang ◽  
Yongming Guo
Keyword(s):  
Friction Coefficient ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Matrix Material ◽  
Stable State ◽  
Wear Resistant Coating ◽  
Wear Resistant ◽  
Content Type ◽  
Resistant Coating ◽  
Conventional Coating

Purpose – The purpose of this paper is to investigate the effects of parallel texturing coating on antifriction mechanism of lubricating wear-resistant coating. Design/methodology/approach – A KF301/WS2 lubricating wear-resisting coating was prepared on matrix material GCr15 by applying supersonic plasma spraying technology. On the basis of this sample, the KF301/WS2 modified coating with parallel pit-type texture was prepared by laser re-melting technology and a surface texturing technique. Their friction and wear behaviors were evaluated under ambient temperature, and the antifriction mechanism of two kinds of coatings were discussed. Findings – Results showed that parallel texture has a certain impact on the tribological properties of the coating. When friction and wear reach stable state, the value of the friction coefficient of conventional coating was 0.115, while that of parallel texturing coating was 0.09, the latter decreased by 21 per cent. When the friction and wear time was up to 4 hours, the wear loss of the conventional coating was 0.29 mg, while that of the parallel texturing coating was 0.13 mg, the latter decreased by 55 per cent. Originality/value – The tribological properties of parallel texturing coating were higher than conventional coating. That is because the change of three-body layer reduces the friction coefficient and the abrasive particles were collected by parallel texture, reducing the effects of debris.

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