An Experimental Study of Friction and Wear Characteristics of Sunflower and Soybean Oil Methyl Ester Under the Steady-State Conditions by the Four-Ball Wear Testing Machine

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
Mahmoud Amiri Nazari Barsari ◽  
Alireza Shirneshan
Keyword(s):  
Steady State ◽  
Soybean Oil ◽  
Diesel Engines ◽  
Internal Combustion Engines ◽  
Friction And Wear ◽  
Testing Machine ◽  
Wear Testing ◽  
Steady State Condition ◽  
Wear Characteristics ◽  
Fuel Blends

According to that the fuel pump and injectors of the diesel engines are lubricated by the fuel itself, so the lubrication property of the fuels is an important issue in internal combustion engines. Biodiesel is one of the most famous biofuels that can be used in diesel engines. In this research, wear characteristics of biodiesel derived from sunflower and soybean oil blends were investigated. The five fuel blends were tested under steady-state conditions (with durations of 1500 and 3600 s) at four different rotational speeds of 600, 900, 1200, and 1500 rpm. An optical microscope was also applied to check out the worn surfaces of the balls. The results indicated that wear and friction as tribological properties were reduced with the increase in the rotating speed under the steady-state condition. It was found that with an increase in the biodiesel concentration, the friction coefficient was reduced at lower rotating speeds due to free fatty acids, monoglycerides, and diglycerides as the components of biodiesel which help improve the lubrication properties of biodiesel and reduce the friction more than that of other blends. However, in higher rotational speeds, friction and wear of fuel blends included biodiesel increased due to reduced viscosity as the causes of oxidation which helps in the exposure of biodiesel to air at higher temperature. So, B100 has better lubricity properties compared to other fuel blends at lower rotational speeds, and better performance belongs to B20 at higher rotational speeds.

Influence of Liquid Paraffins in Crude Oil on the Friction and Wear Behaviors of the Progressing Cavity Pump`s Stator Rubber

2013 ◽  
Vol 300-301 ◽  
pp. 833-836
Author(s):  
Shi Jie Wang ◽  
Hao Lin ◽  
Xiao Ren Lv
Keyword(s):  
Crude Oil ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Liquid Paraffin ◽  
Testing Machine ◽  
Wear Testing ◽  
Wear Loss ◽  
Oil Well ◽  
Butadiene Rubber ◽  
Better Than

The progressing cavity pump (PCP) always works in the waxy oil well. Therefore the research on the influence of various liquid paraffin contents in crude oil on the friction and wear behaviors of the progressing cavity pump`s stator is very important for choosing the best stator rubber and developing the service life of PCP. Wear behavior of nitrile butadiene rubber (NBR) and fluororubber (FKM) was investigated at room temperature using a reciprocating friction and wear testing machine under the various paraffin contents in crude oil (0%、10%、30%、50%、100%). The wear morphology of blend was analyzed through the stereomicroscope and the wear behavior of two blends was also discussed and compared. The results show that the wear resistance of FKM is better than that of NBR under the same paraffin content in crude oil; With the increase of the paraffin content, the wear and coefficient of friction also increase. When the paraffin content in crude oil is less than 30%, the wear loss of NBR and FKM are basically the same; When the paraffin content in crude oil is more than 30%, the wear loss of NBR is far more than that of FKM.

Tribological Characteristics of Diamond like Carbon Coating in the Presence of Environment Friendly Vegetable Based Oils

2015 ◽  
Vol 642 ◽  
pp. 174-178 ◽  
Author(s):  
K.A.H. Al Mahmud ◽  
M.A. Kalam ◽  
H.H. Masjuki ◽  
H.M. Mobarak
Keyword(s):  
Vegetable Oils ◽  
Carbon Coating ◽  
Friction And Wear ◽  
Testing Machine ◽  
Coconut Oil ◽  
Lubricating Oil ◽  
Diamond Like Carbon ◽  
Environment Friendly ◽  
Wear Characteristics ◽  
Friction And Wear Characteristics

Nowadays environmental awareness issue draws the attention of the scientists; lubricant industry also focuses on environment friendly lubricating oils. Therefore, vegetable oils draw the attention of scientists because of environmental friendly as well as good lubricating characteristics. However, good lubricating vegetable oils often shows inferior property because of low thermal stability, hence, to enhance the performance of vegetable oils self-lubricating diamond like carbon coating is considered, which helps in lowering the friction force which in turn lower friction induced heating, as a result stability of vegetable oils increases. In this current research, three vegetable based oils (sunflower, palm, coconut) are considered as lubricating oil. Tribological tests are conducted by ball on plate tribo-testing machine, tetrahedral type diamond like carbon coated plates and uncoated balls are used in the tribo-pair. Among the testing conditions sunflower oil shows good friction and wear characteristics and coconut oil shows inferior friction and wear characteristics.

Study on the friction characteristics of 304 steel with composite surface modification

2017 ◽  
Vol 69 (2) ◽  
pp. 248-258 ◽  
Author(s):  
Wengang Chen ◽  
Xueyuan Liu ◽  
Lili Zheng
Keyword(s):  
Surface Modification ◽  
Friction And Wear ◽  
Steel Surface ◽  
Testing Machine ◽  
Wear Testing ◽  
Tribological Characteristics ◽  
Textured Surface ◽  
Content Type ◽  
Good Basis ◽  
Modified Surface

Purpose This paper aims to clarify the friction properties of 304 steel surface modification. The surface modification includes laser texturing processing and nitriding treatment on 304 steel surface, and then the friction properties’ test was conducted on different friction directions and different upper test samples by using microfriction and wear testing machine. Design/methodology/approach The diameter and spacing of 100-, 150-, 200-, 300-μm pit array on the surface of 304 steel were calculated using a M-DPSS-50 semiconductor laser device. Then, the textured surface was nitriding-treated using a nitriding salt bath device. The chemical composition, surface morphology and surface microhardness of the composite-modified surface were measured by X-ray diffraction and by using an optical microscope and a microhardness tester. The tribological characteristics of the composite-modified surface were tested by MRTR microcomputer-controlled multifunctional friction and wear testing machine. Findings The result showed that a rule pit texture surface was obtained by the texture processing. The microhardness of nitriding treatment surface reached 574.27HV0.1, which significantly higher than 222.58HV0.1 of 304 steel. The composite-modified surface has excellent anti-friction and wear resistance properties when the upper specimen was GCr15 steel and ZrO2, respectively. The composite-modified surface has excellent anti-friction and anti-wear properties after long time friction under different angles. However, the friction coefficient and wear morphology of the friction pairs are not affected by the friction angle. Research limitations/implications Because of the chosen research approach, the research results may lack generalizability. Therefore, researchers are encouraged to test the proposed propositions further. Practical implications The paper conducted a systematic study of the tribological characteristics of 304 steel composite modification surface and provided a good basis for the extensive application of 304 steel. Social implications The study provides a good basis for the extensive application of 304 steel. Originality/value This paper fulfils an identified need to study the extensive application of 304 steel.

Research on the Friction and Wear Properties of the Copper Matrix Composites Reinforced with Copperized Carbon Fibers

2014 ◽  
Vol 556-562 ◽  
pp. 624-627 ◽  
Author(s):  
Ran Xu ◽  
Yong Wang ◽  
Run Hong Liu ◽  
Hao Zou
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Friction And Wear ◽  
Testing Machine ◽  
Copper Matrix ◽  
Wear Testing ◽  
Wear Property ◽  
Vacuum Sintering ◽  
Graphite Composites ◽  
Coated Carbon

The aim of this paper is to develop a kind of copper matrix self-lubricious material with excellent friction and wear characteristics. The copper-graphite composites reinforced with short copper-coated carbon fibers (CF-C/Cu) were successfully developed using techniques of mechanical alloying, composite plating and hot press vacuum sintering. For comparison, copper-graphite composites without short copper-coated carbon fibers (C/Cu) were made under the same process. The wear testing was carried out using a rapid wear testing machine (M-200).Friction coefficient was measured by a micro-wear tester (UMT).The microstructure, abrasive dust and worn surface of the wear pins on the different condition such as load and wear time were examined by SEM. It was noted that the addition of copper-coated carbon fiber in the Cu-based composites can retard the transformation process which transforms from micro-cutting wear to adhesive wear and delamination. The abrasion loss of the composites with short copper-coated carbon fibers appeared a valley when the load increased from 10N to 30N. It showed that the addition of copper-coated carbon fiber enhanced the anti-friction and anti-wear property of copper matrix composite and better than the sample without carbon fibers.

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.

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