Effects of Load and Rotate Speed on the Friction of NBR by 45# Steel in Crude Oil Medium

2011 ◽  
Vol 230-232 ◽  
pp. 1079-1083
Author(s):  
Yi Zhang ◽  
Shi Jie Wang ◽  
Zhong Feng Guo ◽  
Zhong Wei Ren
Keyword(s):  
Friction Coefficient ◽  
Crude Oil ◽  
Constant Temperature ◽  
Testing Machine ◽  
Butadiene Rubber ◽  
Nitrile Butadiene Rubber ◽  
Friction Testing ◽  
Low Load ◽  
Test Result

Select two types of nitrile-butadiene rubber (NBR) which they are different in ingredients, under two types of crude oil medium respectively, the test is carried out on the friction testing machine. The test result shows that under the constant intermediate-low rotate speed and constant temperature, the friction coefficient decreases as the load increases; under the constant intermediate-low load and constant temperature, the friction coefficient increases as the rotate speed increases.

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.

scholarly journals Tribological Properties of Molybdenum Disulfide and Helical Carbon Nanotube Modified Epoxy Resin

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 903 ◽  
Author(s):  
Zhiying Ren ◽  
Yu Yang ◽  
Youxi Lin ◽  
Zhiguang Guo
Keyword(s):  
Elastic Modulus ◽  
Friction Coefficient ◽  
Epoxy Resin ◽  
Molybdenum Disulfide ◽  
Tribological Properties ◽  
Testing Machine ◽  
Three Dimensional ◽  
Friction Testing ◽  
Helical Carbon Nanotubes ◽  
Modified Epoxy

In this study, epoxy resin (EP) composites were prepared by using molybdenum disulfide (MoS2) and helical carbon nanotubes (H-CNTs) as the antifriction and reinforcing phases, respectively. The effects of MoS2 and H-CNTs on the friction coefficient, wear amount, hardness, and elastic modulus of the composites were investigated. The tribological properties of the composites were tested using the UMT-3MT friction testing machine, non-contact three-dimensional surface profilometers, and nanoindenters. The analytical results showed that the friction coefficient of the composites initially decreased and then increased with the increase in the MoS2 content. The friction coefficient was the smallest when the MoS2 content in the EP was 6%, and the wear amount increased gradually. With the increasing content of H-CNTs, the friction coefficient of the composite material did not change significantly, although the wear amount decreased gradually. When the MoS2 and H-CNTs contents were 6% and 4%, respectively, the composite exhibited the minimum friction coefficient and a small amount of wear. Moreover, the addition of H-CNTs significantly enhanced the hardness and elastic modulus of the composites, which could be applied as materials in high-temperature and high-pressure environments where lubricants and greases do not work.

Comparative Study on the Wear Behavior of FPM and NBR in the Natural Crude Oil Medium

2013 ◽  
Vol 456 ◽  
pp. 349-353
Author(s):  
Zhe Wang ◽  
Shi Jie Wang
Keyword(s):  
Friction Coefficient ◽  
Crude Oil ◽  
Wear Behavior ◽  
Testing Machine ◽  
Wear Test ◽  
Premature Failure ◽  
Oil Drilling ◽  
Rotating Speed ◽  
Before And After ◽  
Abrasion Testing

The wear behavior of stator rubber in the natural medium of crude oil in oil-drilling screw pumps directly matters to its service life and sealing property. The premature failure of stator rubber is the main cause for the shortening life of screw pumps. In order to study the wear mechanism of NBR and FPM, a friction wear test was conducted at room temperature by using a MPV-600 micro-computer-controlling grain-abrasion testing machine, in which NBR, FPM and 45# steal pair are the testing subjects. SEM was afterwards employed to observe the surface topography before and after the rubber wear. The test result shows that at the constant low load, the wear extent of FPM increases in a stable, linear way when the rotor rotating speed increases, and the wear extent of NBR increases with the increasing speed of the rotor rotating speed. However, when the rotating speed is over 400r/min, the wear extent of NBR decreases instead. This might be attributed to the improvement of the local lubrication state on the friction surface. Much consistence is indicated in the changing rule of the friction coefficient of the two types of rubber and the changing wear extent with the rotating speed. At the constant, low rotating speed, the wear extent of NBR and FPM basically increases linearly, while the friction coefficient of NBR, FPM and steel pair decreases with the increasing load.

Fabrication and Properties of Cu-Cr Coatings on the Inner Wall of Steel Pipe by Mechanical Alloying Method

2012 ◽  
Vol 602-604 ◽  
pp. 1663-1666
Author(s):  
Zhong Qing Tian ◽  
Guo Xing Zhang ◽  
Wei Jiu Huang ◽  
Yu Kai Zhu
Keyword(s):  
Friction Coefficient ◽  
Mechanical Alloying ◽  
Coating Thickness ◽  
High Speed ◽  
Testing Machine ◽  
Optical Microscope ◽  
Steel Pipe ◽  
Rotating Speed ◽  
Friction Testing ◽  
Cr Coating

The mechanical alloying method process has been innovatively used to prepare Cu-Cr coating on the inner wall of steel pipe. The effect of the rotating speed on thickness, microhardness and friction coefficient of the Cu-Cr coating was investigated. The coating thickness was measured from all samples using optical microscope. The microhardness was analyzed by Digital Microhardness Tester. The friction coefficient was tested by high speed reciprocating friction testing machine. The results show that the coating thickness is 26, 29 and 31μm at the rotating speed of 200, 250 and 300 rpm. The microhardness of the Cu-Cr coating prepared at 200, 250 and 300 rpm are about 760, 780 and 830 Hv. The friction coefficient of the Cu-Cr coating prepared at 200 rpm are about 0.25, 0.40 and 0.38 at the frequencies of 3, 4 and 5 Hz. The friction coefficient of the Cu-Cr coating prepared at 250 rpm are about 0.30, 0.29 and 0.20 at the frequencies of 3, 4 and 5 Hz. The friction coefficient of the Cu-Cr coating prepared at 300 rpm are about 0.10, 0.13 and 0.09 at the frequencies of 3, 4 and 5 Hz.

Investigation on Friction and Thermal Expansion Coefficients of Al-Sn Bearing Alloys

2007 ◽  
Vol 353-358 ◽  
pp. 3063-3066 ◽  
Author(s):  
Yong Zhi Zou ◽  
Zheng Bin Xu ◽  
Yan Gao ◽  
Hong Gu ◽  
Jian Min Zeng
Keyword(s):  
Thermal Expansion ◽  
Friction Coefficient ◽  
Testing Machine ◽  
Alloy System ◽  
The Other ◽  
Thermal Expansion Coefficients ◽  
Friction Testing ◽  
Other Hand ◽  
Expansion Coefficients

The influences of Sn addition of 3%-30% on the friction and thermal expansion properties of Al-Sn bearing alloys were investigated in this paper. The experiments were carried out on a specially designed friction testing machine and a dilatometer. It is shown by the experiments that the friction coefficient and hardness of the alloys decrease with the increasing of Sn content. The friction coefficient decreases dramatically when Sn content is higher than 6%. On the other hand, the friction coefficient is also dependent on the load. The friction coefficient increases as the load rises. The linear CTE is also a function of temperature and Sn contents. CTE increases when the temperature rises but has no obvious differences for the alloy system when the temperature is below 80°C. As the temperature rises, the differences become large among the alloy system. The higher the Sn content, the lower the CTE.

scholarly journals In vitro evaluation of physical vapor deposition coated beta titanium orthodontic archwires

2011 ◽  
Vol 82 (1) ◽  
pp. 22-29 ◽  
Author(s):  
Vinod Krishnan ◽  
K. K. Ravikumar ◽  
K. Sukumaran ◽  
K. Jyothindra Kumar
Keyword(s):  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Testing Machine ◽  
Frictional Properties ◽  
Friction Testing ◽  
Beta Titanium ◽  
Low Load ◽  
Orthodontic Archwires ◽  
Deflection Rate

Abstract Objective: To determine in vitro the frictional properties, surface morphology, and load deflection rate with looped designs of two newly developed titanium aluminum nitride (TiAlN) and tungsten carbide/carbon (WC/C) physical vapor deposition (PVD) coated beta titanium orthodontic archwires coated with PVD. Materials and Methods: Frictional properties with Tidy's protocol, surface evaluation before and after friction testing with the help of scanning electron microscopy (ESEM), and load deflection rate with different orthodontic loops on Instron universal testing machine were evaluated. Results: The results clearly indicate reduced frictional properties for WC/C coated archwires when compared with uncoated and TiAlN coated archwires. There were no significant surface alterations upon ESEM evaluation of friction tested archwires. Low load deflection rate was exhibited by both coated archwires, the difference in load deflection rate between the coated and uncoated archwires was statistically significant. Conclusion: WC/C coated wires can be recommended for even sliding mechanics due to reduced frictional properties, better surface characteristics, and low load deflection rate compared with TiAlN coated and uncoated archwires.

scholarly journals Studi Eksperimental Performa Kampas Rem Serbuk Tebu dengan Menggunakan Motor Satria Fu 150

2018 ◽  
Vol 1 (2) ◽  
pp. 162-170
Author(s):  
Muhammad Sabri ◽  
Nofiqbal Annisa
Keyword(s):  
Friction Coefficient ◽  
Epoxy Resin ◽  
Sugar Cane ◽  
Fiber Material ◽  
Butadiene Rubber ◽  
Braking Performance ◽  
Brake Pads ◽  
Nitrile Butadiene Rubber ◽  
Braking Distance ◽  
Brake Lining

Kampas rem adalah suatu komponen rem yang paling penting dalam kinerja pengereman, kampas rem adalah suatu material komposit yang tersusun dari beberapa bahan penyusun dan pengikat. Kampas rem ada dua jenis yaitu Abestos yaitu 40 s/d 60%, resin 12% s/d 15%, BaSO4 14% s/d 15%, sisanya karet ban bekas, tembaga sisa kerajinan dan frictdust.dan kampas rem non asbestos yang terbuat dari aramyd atau Kevlar, rockwool, fiberglass, potasiumtitanate, carbonfiber, graphite, cellulose, vemiculate, steelfiber, BaSO4, resin phenolic, nitrile butadiene rubber. Pada penelitian ini peneliti membuat kampas rem non asbestos dari material serat tebu dengan variasi kompoisi 20% serat tebu, 15% MgO, 15% Al dan 25% resin epoxy 25% hardener.25% serat tebu, 15% MgO, 10% Al dan 25% resin epoxy 25% hardener.30% serat tebu, 15% MgO, 5% Al dan 25% resin epoxy 25% hardener. Tujuan dari penelitian ini untuk mendapatkan performa kampas rem menyerupai performa kampas rem non asbestos yang ada dipasaran seperti federal. Pengujian performa kampas rem yang diteliti berupa jarak pengereman, waktu pengereman, koefisien gesek kampas rem dengan disk break, dan pertambahan panas yang dihasilkan karena gesekan yang terjadi. Performa yang mendekati performa kampas rem merek federal dengan nilai jarak pengereman 17.28 m, waktu pengereman 1.94 s, panas yang dihasilkan 46.66667oC, dan koefisien gesek 0.812 pada kecepatan 60km/h dengan gaya tekan pedal rem sebesar 30N, dari standar performa jarak yang mendekati adalah komposisi C 17.45 m, Waktu pengereman komposisi C 1.98s. koefisien gesek komposisi C 0.804, dan panas komposisi C 48.6667oC. Brake lining is the most important brake component in braking performance. Brake lining is a composite material consists of several constituent materials and binders. There are two types of brake pads, namely Abestos 40% to 60%, resin 12% to 15%, BaSO4 14% to 15%, the rest are rubber tires, remaining copper craft and frictdust. While non asbestos brake shoes are made from aramyd or Kevlar, rockwool, fiberglass, potasiumtitanate, carbonfiber, graphite, cellulose, vemiculate, steelfiber, BaSO4, resin phenolic, and nitrile butadiene rubber. In this study, the researchers created non asbestos brake shoes from sugar cane fiber material with variation composition i.e. 20% sugar cane fiber, 15% MgO, 15% Al and 25% epoxy resin 25% hardener; 25% sugarcane fiber, 15% MgO, 10% Al and 25% epoxy resin 25% hardener; and 30% sugarcane fiber, 15% MgO, 5% Al and 25% epoxy resin 25% hardener. The purpose of this study is to obtain brake lining performance which resembling the performance of non-asbestos brake linings available in market such as federal brand. Brake lining performance were examined by testing the braking distance, braking time, brake pad friction coefficient with disk break, and the heat generated due to friction occurred. Performance which approaches the performance of federal brand brake shoes with a braking distance value of 17.28 m, braking time of 1.94 s, the heat generated was 46.66667 0C, and friction coefficient of 0.812 at a speed of 60 km/h with a brake pedal press force of 30 N, from similar standard performance distance was composition C 17.45 m, braking time composition C 1.98 s, friction coefficient composition C 0.804, and heat composition C 48.6667 0C.

Influence of Boron Nitride on Tribological Behavior of Nickel-Base Composite Coatings at High Temperature

2011 ◽  
Vol 686 ◽  
pp. 711-715 ◽  
Author(s):  
Yong Kang Zhang ◽  
Jian Liang Li ◽  
Dang Sheng Xiong ◽  
Yong Kun Qin
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Boron Nitride ◽  
Wear Rate ◽  
Composite Coatings ◽  
Testing Machine ◽  
Optimum Process ◽  
Wear Properties ◽  
Friction Behavior ◽  
Friction Testing

The nickel-based boron nitride composite coatings were prepared by reversing pulse electro-deposition. The mechanical properties and friction behavior of the coatings at high temperature were tested by using Al2O3 ceramic ball at high temperature friction-testing machine. The results show that the surface micro-hardness of the coatings increases with the addition of BN powder. Meanwhile, the friction coefficient and wear rate of specimens decreases. Especially when the BN addition is 1.5g/L the composite coatings present a minimum of friction coefficient and wear rate. In optimum process parameters, the friction coefficient of the coatings is about 0.2 at room temperature and 0.4-0.5 at 600°C. In addition, the friction and wear properties were significantly improved by plating Ni transition layer plated between substrate and composite coating.

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