Abrasion Resistance of Alumina-Titanium Dioxid Coating at High Temperature

2013 ◽  
Vol 302 ◽  
pp. 115-118 ◽  
Author(s):  
Zhi Fang Cheng ◽  
Hong Sheng Ding ◽  
Hui Rong ◽  
Li Geng Zhao
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Abrasion Resistance ◽  
Friction And Wear ◽  
Testing Machine ◽  
Wear Testing ◽  
Wear Volume ◽  
Air Plasma ◽  
Nano Coating ◽  
Tio2 Coatings

Nano-structured and micron Al2O3-13%TiO2 coatings were deposited by air plasma spraying.Wear properties of the coatings under different temperature trough SRV friction and wear testing machine were studied, the results shows that the friction coefficient of nano and micron Al2O3-13%TiO2 coatings both have rising trend.with the temperature increases.The wear volume of micron coating is 1.8-2 times that of the nano coating..The nanometer Al2O3-13%TiO2 coating slide with ZrO2 is still compact and has no large crack after abrasion.

Study on Repair Techniques of Loader pin Based on Remanufacturing

2012 ◽  
Vol 220-223 ◽  
pp. 83-86
Author(s):  
Yu Ling Wang ◽  
Yin Xiang Kong ◽  
Bao Hua Wu
Keyword(s):  
Abrasion Resistance ◽  
High Speed ◽  
Friction And Wear ◽  
Testing Machine ◽  
Surface Hardness ◽  
Wear Testing ◽  
Arc Spraying ◽  
Flame Spray ◽  
Electrical Arc ◽  
The Way

Pins of loader are damaged easily, and most of them have been abandoned every year. Remanufacturing for pins can reduce waste of natural resources and energy sources. In this paper, pins with different abrasion loss were selected and remanufactured by electrical arc spraying and oxy-acetylene flame spray welding, respectively. Then, the parameters of remanufactured pins such as dimension, surface roughness, surface hardness and crack were measured. Furthermore, the friction and wear characteristics of the repair coating/nickel coating pair were tested under dry lubrication condition with the MRH-3 high-speed ring-block friction and wear testing machine. With the help of SEM (scanning electron microscope) to observe the surface morphology of blocks, abrasion resistance of spray welding coating and spray coating were analyzed. Results indicate that two remanufacturing techniques both can make the scrap pins as new products, but pins which are remanufactured in the way of oxy-acetylene flame spray welding have better abrasion resistance than the way of electrical arc spraying.

Research on Friction Property of Pin on Disc and Analysis of Wear Mechanism Based on MMW-1A Friction and Wear Testing Machine

2018 ◽  
Vol 764 ◽  
pp. 86-92
Author(s):  
Zhi Peng Chen ◽  
Xiao Yi Jin ◽  
Chun Yun Ji ◽  
Chuan Wang ◽  
Jian Liu Zhu
Keyword(s):  
Friction Factor ◽  
Friction And Wear ◽  
Sliding Friction ◽  
Mechanical Design ◽  
Testing Machine ◽  
Wear Test ◽  
Wear Testing ◽  
Wear Volume ◽  
Test Machine ◽  
Pin On Disc

Friction and wear are very important in mechanical design. This paper studies the friction and wear characteristics of 45 steel under oil lubrication. The sliding friction and wear experiment was carried out with the pin plate friction pairs on the MMW-1A friction and wear test machine. Researching the influence of velocity on friction factor under the same load, the relation between wear and load and wear analysis under the same speed different loads. The results showed that under the same load and with the increase of velocity, the friction factor had a gradually decreasing trend. When some of the parameters were certain, the wear volume and the loading force was roughly linear relation. Pitting occurred when the load increased.

Study on Tribological Performance of Al2O3 Particle Reinforced the Al-Sn Bearing Alloy

2014 ◽  
Vol 633-634 ◽  
pp. 137-140 ◽  
Author(s):  
Bin Sui ◽  
Jian Min Zeng ◽  
Ping Chen ◽  
Li Hua Liang ◽  
Wu Kui Gan ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Grain Boundary ◽  
Friction And Wear ◽  
Testing Machine ◽  
Tribological Performance ◽  
Wear Testing ◽  
Improve Performance ◽  
Computer Controlled ◽  
Bearing Alloy

In order to improve performance of Al-Sn bearing alloys, a new Al2O3/Al-Sn composite was fabricated through in-situ reaction between Al and SiO2. A study has been conducted to investigate tribological performance of the composite on MMW-1 Computer controlled vertical universal friction and wear testing machine. The results show that Al2O3 and Si particles are mainly distributed in the grain boundary and particles are often coated by a thin Sn layer. Friction coefficient of Al2O3/Al-Sn composites is decreased with Sn additions up to 21wt. %.

scholarly journals Tribological Properties of V-Shaped Surface Texture under Oil Lubrication Condition

2019 ◽  
Vol 37 (2) ◽  
pp. 401-406
Author(s):  
Yuanbo Wu ◽  
Xuefeng Yang ◽  
Shouren Wang ◽  
Jian Cheng ◽  
Hui Zhang ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Tribological Properties ◽  
Turbulence Intensity ◽  
Friction And Wear ◽  
Testing Machine ◽  
Wear Testing ◽  
Oil Lubrication ◽  
Oil Film ◽  
Texture Model ◽  
The Stability

In order to study the tribological properties of V-shaped texture under oil lubrication conditions, the loading force and speed are selected as the influencing factors, each factor selected six levels. Experimental study on friction and wear of V-shaped texture with ring arrangement is finished by MMG-10 Multifunctional Friction and Wear Testing Machine, and the data of the experimental results are analyzed by using Matlab. The results show that there is a near linear relationship between the friction coefficient and the loading force and velocity. The relationship between the friction coefficient and the loading force and velocity can be expressed by a functional equation. The loading force has a greater influence on the friction coefficient than the speed. The SEM images of the post-test specimens show that the main weared zone of the V-shaped texture is the tip part. Create a single V-shaped texture model with Solidworks and use CFD to divide the mesh into the Fluent solution. According to the pressure distribution cloud diagram and the turbulence intensity cloud diagram, the stability of the oil film is improved due to the enhanced fluidity of the oil film and the small change in the oil pressure. The tip portion is also the region with a large turbulence intensity value. The improvement of the stability of the oil film is the key to reduce the friction coefficient of the V-shaped texture when the loading force increases.

scholarly journals Friction and Wear Behaviors of Fe-19Cr-15Mn-0.66N Steel at High Temperature

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1285
Author(s):  
Shaolong Sheng ◽  
Huiling Zhou ◽  
Xiaojing Wang ◽  
Yanxin Qiao ◽  
Hongtao Yuan ◽  
...  
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Photoelectron Spectroscopy ◽  
Laser Scanning ◽  
Friction And Wear ◽  
Laser Scanning Confocal Microscopy ◽  
Wear Testing ◽  
Oxide Layers ◽  
X Ray ◽  
Scanning Confocal Microscopy

The friction and wear behaviors of Fe-19Cr-15Mn-0.66N steel were investigated under applied loads of 5 N and 15 N at the wear-testing temperatures of 300 °C and 500 °C using a ball-on-disc tribometer. The wear tracks were evaluated by scanning electron microscopy (SEM) and laser scanning confocal microscopy (LSCM) to reveal the variation in morphologies. Energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) were used to determine the components of oxide layers formed on wear surfaces. The results demonstrated that the oxide layers are favorable for obtaining a low friction coefficient under all conditions. The average friction coefficient decreased with increasing load at 300 °C, while it increased with the increase in applied load at 500 °C. At 300 °C, severe abrasive wear characterized by grooves resulted in a high friction coefficient with 5 N applied, whereas the formation of a denser oxide layer consisting of Cr2O3, FeCr2O4, Fe2O3, etc., and the increased hardness caused by work hardening led to a decrease in friction characterized by mild adhesive wear. At 500 °C, the transformation of Fe2O3 to the relatively softer Fe3O4 and the high production of lubricating Mn2O3 resulted in a minimum average friction coefficient (0.34) when 5 N was applied. However, the softening caused by high temperature weakened the hardening effect, and thus the friction coefficient increased with 15 N applied at 500 °C.

The Friction and Wear Properties of Cu-Te-Li Alloys with High-Strength and High-Conductivity

2014 ◽  
Vol 599-601 ◽  
pp. 153-159 ◽  
Author(s):  
Tao Zeng ◽  
Lin Jiao ◽  
Da Chuan Zhu ◽  
Chen Yang
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Friction And Wear ◽  
Adhesive Wear ◽  
Testing Machine ◽  
Aging Treatment ◽  
Wear Testing ◽  
Dry Sliding ◽  
Wear Properties ◽  
Friction And Wear Properties

The friction and wear properties of Cu-Te-Li alloys under dry sliding condition were studied by M-200 wear testing machine. The morphology and chemical composition of worn surfaces were analyzed by SEM and EDS, thus the effect of aging treatment on friction coefficient, wear rate and wear mechanism was discussed. The results showed that Te element could improve the wear resistance of copper alloys. With Te content increasing, the friction coefficient of Cu-Te-Li alloys declined slightly and tended to be stable as a whole, while the wear rate decreased obviously. During the process of dry sliding friction, adhesive wear was the dominant mechanism, with oxidative wear coexisting. But for the Cu-Te-Li alloys after aging treatment, abrasive wear appeared and adhesive wear was intensified, especially at higher friction velocity.

Tribological Behavior of Mesophase Carbon Added with Titanium and Copper

2011 ◽  
Vol 80-81 ◽  
pp. 60-63
Author(s):  
Xue Qing Yue ◽  
Hua Wang ◽  
Shu Ying Wang
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Friction Coefficient ◽  
Ball Mill ◽  
Friction And Wear ◽  
Applied Load ◽  
Tribological Behavior ◽  
Metallic Elements ◽  
X Ray Diffraction ◽  
X Ray

Incorporation of metallic elements, titanium and copper, into carbonaceous mesophase (CM) was performed through mechanical alloying in a ball mill apparatus. The structures of the raw CM as well as the Ti/Cu-added CM were characterized by X-ray diffraction. The tribological behavior of the Ti/Cu-added CM used as lubricating additives was investigated by using a high temperature friction and wear tester. The results show that, compared with the raw CM, the Ti/Cu-added CM exhibits a drop in the crystallinity and a transition to the amorphous. The Ti/Cu-added CM used as lubricating additive displays an obvious high temperature anti-friction and wear resistance effect, and the lager the applied load, the lower the friction coefficient and the wear severity.

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 Microstructures and high-temperature self-lubricating wear-resistance mechanisms of graphene-modified WC-12Co coatings

Friction ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 315-331 ◽  
Author(s):  
Haoliang Tian ◽  
Changliang Wang ◽  
Mengqiu Guo ◽  
Yongjing Cui ◽  
Junguo Gao ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
High Temperature ◽  
Friction Coefficient ◽  
Adhesive Strength ◽  
Friction And Wear ◽  
Resistance Mechanisms ◽  
High Temperature Treatment ◽  
Wear Properties ◽  
Powder Preparation ◽  
Wear Resistant

AbstractTo reduce the friction coefficient of cobalt-cemented tungsten carbide (WC-12Co) wear-resistant coatings, graphene was compounded into WC-12Co powder via wet ball milling and spray granulation. Self-lubricating and wear-resistant graphene coatings were prepared via detonation gun spraying. The presence, morphologies, and phase compositions of graphene in the powders and coatings that are obtained through different powder preparation processes were analyzed. The analysis was performed using the following technologies: energy-dispersive X-ray-spectroscopy (EDXS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy. The mechanical properties of the coatings were studied using a microhardness tester and a universal drawing machine. The friction and wear properties of the coatings were studied using an SRV-4 friction and wear tester. The results showed that the graphene content in the WC-12Co coating modified with graphene was higher than that without modification; graphene was embedded in the structure in a transparent and thin-layer state. The adhesive strength of this coating at approximately 25 °C was approximately 60.33 MPa, and the hardness was approximately 984 HV0.3. After high-temperature treatment, the adhesive strength and hardness of the graphene oxide (GO)/WC-12Co coating decreased slightly (the lowest adhesive strength of 53.16 MPa was observed after treatment at 400 °C, and the lowest hardness of approximately 837 HV0.3 was observed after treatment at 300 °C). Compared to the friction coefficient (0.6) of the WC-12Co coating obtained at room temperature, the friction coefficient of the GO/WC-12Co coating was decreased by approximately 50% of that value. The graphene-modified coating was continuously exposed to the wear tracks on the surface of the contacting materials during friction, and a lubricating film was formed in the microareas in which the wear tracks were present. The coating exhibited improved self-lubricating and wear-resistant effects compared to the unmodified WC-12Co coating. The results of this study demonstrated that graphene could be effective in self-lubrication and wear-reduction in a temperature range of 100–200 °C, as a friction coefficient of 0.3 was maintained.

Wear Properties of DLC and Plasma Sprayed WC Structure Coating

2007 ◽  
Vol 127 ◽  
pp. 245-250 ◽  
Author(s):  
Mitsuyasu Yatsuzuka ◽  
Yoshihiro Oka ◽  
Akifumi Tomita ◽  
Noritaka Murata ◽  
Mitsuaki Hirota
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Testing Machine ◽  
Carbon Film ◽  
Wear Testing ◽  
Wear Properties ◽  
Dlc Film ◽  
Coated Metal ◽  
Hydrocarbon Gas ◽  
Plasma Sprayed

Diamond-like carbon film (DLC) with an interlayer of plasma sprayed tungsten-carbide (WC) was prepared on an aluminum alloy substrate (A5052) by a hybrid process of plasma-based ion implantation and deposition using hydrocarbon gas. Typical thicknesses of DLC and WC films were 1 μm and 100 μm, respectively. The hardness and friction coefficient of DLC were typically 15 GPa and 0.15, respectively. The durability of DLC/WC/A5052 system was evaluated from the measurement of the friction coefficient by a ball-on-disk friction tester in which the loaded ball was drawn repeatedly across a sample and the load was increased with each traverse. For the DLC/A5052 system, which has no WC interlayer, the DLC film was broken quickly because of distortion of the substrate. For the DLC/WC/A5052 system, on the other hand, the DLC film was excellent in durability for long running. The wear rate of rubber rotor to the metal rotor was measured by a roller-pitching-type wear testing machine, showing large reduction in wear rate using DLC-coated metal rotor.

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