Tribological Property Investigation of Self-Lubricating Molybdenum-Based Zirconia Ceramic Composite Operational at Elevated Temperature

2019 ◽  
Vol 142 (2) ◽  
Author(s):  
Kunal Ghosh ◽  
Subhrojyoti Mazumder ◽  
Bipin Kumar Singh ◽  
Harish Hirani ◽  
Poulomi Roy ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Wear Rate ◽  
Photoelectron Spectroscopy ◽  
Ceramic Composite ◽  
Wear Behavior ◽  
Substantial Reduction ◽  
Tetragonal Zirconia ◽  
Zirconia Ceramic ◽  
Sintering Process ◽  
Wear Debris Analysis

Abstract Three mol% yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP) with 0.5 wt% of magnesium oxide (MgO) and 6 wt% of molybdenum (Mo) were prepared by the pressureless sintering process, and the friction and wear behavior of the ceramic composite were studied against the alumina disc. Tribological tests were carried out both at room temperature as well as at an elevated temperature (500 °C). The result revealed that a substantial reduction of ∼50% in the friction coefficient and ∼31% reduction in the wear rate were achieved while 6 wt% Mo was added into the 3Y-TZP matrix operational at 500 °C. No significant tribological influence was observed with the addition of Mo at the normal operating temperature. The minimum coefficient of friction and low specific wear rate were achieved because of the formation of MoO3 in between the mating surfaces at elevated temperature. The worn surfaces were characterized by means of field emission scanning electron microscopy (FESEM). The formation of MoO3 phases was identified by wear debris analysis which was performed with the help of X-ray photoelectron spectroscopy (XPS).

scholarly journals Phase Formation andWear Resistance of Carbon-Doped TiZrN Nanocomposite Coatings by Laser Carburization

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 590
Author(s):  
Seonghoon Kim ◽  
Taewoo Kim ◽  
Eunpyo Hong ◽  
Ilguk Jo ◽  
Jaeyoung Kim ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Phase Formation ◽  
Amorphous Carbon ◽  
Thermal Energy ◽  
Photoelectron Spectroscopy ◽  
Wear Behavior ◽  
Microstructural Analysis ◽  
Nanocomposite Coatings ◽  
Carbon Doped

Carbon-doped TiZrN nanocomposite coatings were investigated for phase formation and wear behavior. They were prepared by laser carburization using carbon paste, and the thermal energy of the pulsed laser was limited to the range of 20 to 50%. X-ray photoelectron spectroscopy analysis revealed that the ratio of carbide (TiC, ZrC) increased as the thermal energy of the laser increased. The sp2/sp3 ratio increased by approximately 16% when the laser thermal energy was raised from 30 to 40%, and the formation of amorphous carbon was confirmed in the carbon-doped TiZrN coatings. As a result of microstructural analysis, the carbon-doped TiZrN nanocomposite was formed by an increase of hybrid bonds in expanded localized carbon clusters. Wear resistance was evaluated using a ball-on-disc tester, which showed that the friction coefficient decreased from 0.74 to 0.11 and the wear rate decreased from 7.63 × 10−6 mm3 (Nm)−1 to 1.26 × 10−6 mm3 (Nm)−1. In particular, the friction coefficient and wear rate improved by 71 and 66%, respectively, owing to the formation of carbon-doped TiZrN nanocomposite with amorphous carbon while the thermal energy was increased from 30 to 40%.

Effect of heat treatment and electric discharge alloying on the tribological performance of Selective Laser Melted AlSi10Mg

2021 ◽  
pp. 1-21
Author(s):  
Thasleem Payaningal ◽  
Basil Kuriachen ◽  
Deepak Kumar ◽  
Afzaal Ahmed ◽  
Joy ML
Keyword(s):  
Heat Treatment ◽  
Elevated Temperature ◽  
Wear Rate ◽  
Electric Discharge ◽  
Elevated Temperatures ◽  
Wear Behavior ◽  
Cast Specimen ◽  
En 31 ◽  
Pin On Disk ◽  
Oxidation Wear

Abstract Selective Laser Melting (SLM) is an emerging additive manufacturing technology for fabrication of complex light-weight components along with improved mechanical properties. The present work investigates influence of various post processing methods such as Heat Treatment and Electric Discharge Alloying (EDA) on ambient and elevated temperature wear behavior of Selective Laser Melted (SLM) AlSi10Mg alloy and compared with its tribological behavior with cast AlSi10Mg. The dry wear tests were conducted using a Pin On Disk (POD) tribometer with EN-31 as counter body. The EDA treated SLM AlSi10Mg showed the least wear rate and coefficient of friction (COF) at both ambient and elevated temperatures (1.05 × 10−4 mm31/Nm and 0.434 & 3.12 × 10−5 mm3/Nm and 0.531 respectively) due to its higher hardness (189.8 HV) as compared to other samples. The wear rate and COF of cast specimen are found to be highest among all specimens at both ambient and elevated temperatures (1.34 × 10−4 mm3/Nm and 0.528 and 4.49 × 10−5 mm3/Nm and 0.724 respectively). Lower wear rate and higher COF are observed at elevated temperature due to the excessive formation of wear-resistant oxides (Al2O3, SiO2 and MgO) and glaze layers for all samples compared to ambient temperature wear behaviors of its counter parts. Abrasive wear, adhesive wear, oxidation wear and surface delamination are the prominent wear mechanisms observed for ambient and elevated temperatures for all the specimens.

Effect of High Temperature on Wear Behavior of Stir Cast Aluminium/Boron Carbide Composites

2020 ◽  
Vol 22 (4) ◽  
pp. 1031-1046
Author(s):  
X. Canute ◽  
M. C. Majumder
Keyword(s):  
High Temperature ◽  
Wear Rate ◽  
Boron Carbide ◽  
Wear Behavior ◽  
Base Alloy ◽  
Weight Fraction ◽  
Sliding Velocity ◽  
Wear Properties ◽  
High Temperature Wear ◽  
The Matrix

AbstractThe need for development of high temperature wear resistant composite materials with superior mechanical properties and tribological properties is increasing significantly. The high temperature wear properties of aluminium boron carbide composites was evaluated in this investigation. The effect of load, sliding velocity, temperature and reinforcement percentage on wear rate was determined by the pin heating method using pin heating arrangement. The size and structure of base alloy particles change considerably with an increase of boron carbide particles. The wettability and interface bonding between the matrix and reinforcement enhanced by the addition of potassium flurotitanate. ANOVA technique was used to study the effect of input parameters on wear rate. The investigation reveals that the load had higher significance than sliding velocity, temperature and weight fraction. The pin surface was studied with a high-resolution scanning electron microscope. Regression analysis revealed an extensive association between control parameters and response. The developed composites can be used in the production of automobile parts requiring high wear, frictional and thermal resistance.

Effect of colourants on the optical characteristics and structure of Y 2 O 3 stabilised tetragonal zirconia ceramic

2021 ◽  
Author(s):  
Jianfeng Chen ◽  
Ning Wen ◽  
Chundong Xue ◽  
Zhaocen Liu ◽  
Zhuoran Liang ◽  
...  
Keyword(s):  
Tetragonal Zirconia ◽  
Optical Characteristics ◽  
Zirconia Ceramic

scholarly journals Experimental Wear Behavior Analysis of Coated Spindle Hook Teeth under Real Harvesting Work Conditions

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2487
Author(s):  
Yanqing Gu ◽  
Hongwen Zhang ◽  
Xiuqing Fu ◽  
Lei Wang ◽  
Zhenyu Shen ◽  
...  
Keyword(s):  
Wear Rate ◽  
Wear Behavior ◽  
Field Work ◽  
Work Conditions ◽  
Tooth Surface ◽  
Wear Area ◽  
Cutting Surface ◽  
Spatial Distribution Characteristics ◽  
Process Failure ◽  
Major Chemical

This study aimed to investigate the wear failure changes of spindle hook teeth and the reasons for such failure during field work. Spindle samples were obtained from a fixed position of the spindle bar under different field picking area conditions and combined with the spatial distribution characteristics of cotton bolls in Xinjiang. After cutting a spindle sample, a scanning electron microscope and an energy spectrum analyzer were used to characterize the micromorphology and element composition of the hook tooth surface and cross section under different working area conditions. The wear parameters of the hook teeth were then extracted. The results showed that the thickness of the coating on the surface of the hook tooth used in this study was between 66.1 µm and 74.4 µm. The major chemical element was chromium, with a small amount of nickel. During the field picking process, failure of the coating on the surface of the hook teeth initially appeared on the tooth tip and tooth edge, and then spread to the entire hook tooth surface. The wear failure of the hook teeth resulted from abrasive wear, oxidative wear, and fatigue peeling. As the picking area increased, the wear area of the hook teeth increased exponentially, while the wear width increased linearly. When the field picking area reached 533.33 ha, the maximum change rate of the wear area was 2.33 × 103 µm2/ha, and the wear width was 1.84 µm/ha. During field work, the thickness of the coating decreased from the cutting surface to the tooth edge, and the wear rate gradually increased. The wear rate at Position 1 was the slowest, at 0.01 µm/ha, and the wear rate at Position 5 was the fastest, at 0.25 µm/ha.

High-speed electrical sliding wear behaviors of Cu-WS2-graphite-WS2 nanotubes composite

2018 ◽  
Vol 25 (2) ◽  
pp. 343-351
Author(s):  
Gang Qian ◽  
Yi Feng ◽  
Jing-Cheng Zhang ◽  
Yang Wang ◽  
Tian-Ci Zhang ◽  
...  
Keyword(s):  
Wear Rate ◽  
Contact Resistance ◽  
Photoelectron Spectroscopy ◽  
High Speed ◽  
Electrical Current ◽  
Tangential Direction ◽  
Sliding Velocity ◽  
Graphite Composite ◽  
Slip Ring ◽  
Electrical Wear

AbstractCu-WS2-graphite-WS2nanotubes composite was fabricated by the powder metallurgy hot-pressed method. The effects of electrical current (5–15 A/cm2) and sliding velocity (5–15 m/s) on the electrical wear behaviors of the composite were investigated using a block-on-slip ring wear tester rubbing against Cu-5 wt% Ag alloy ring under 2.5 N/cm2of applied load. The lubricating effect of WS2nanotubes and composition of tribo-film were analyzed. The results demonstrated that the contact resistance decreases but the wear rate increases as electrical current increases, because the adverse effects of electrical current soften the materials at “a-spots” and damage the tribo-film. Due to the adsorption of gaseous molecule film on the tangential direction of slip ring surface, with the rise of sliding velocity, the contact resistance increases while the wear rate reaches the minimum at a sliding velocity of 10 m/s. The reasonable addition of WS2nanotubes into the Cu-WS2-graphite composite to replace WS2powder can result in a reduction of both contact resistance and wear rate. X-ray photoelectron spectroscopy (XPS) analyses revealed that copper oxides, graphite, WS2and WS2nanotubes in the tribo-film play the main lubrication action at the tribo-interface.

Effect Multiple Addition (TiO2 and Fly Ash) on Wear Behavior and Hardness of 2024 Al Alloy

2021 ◽  
Vol 1039 ◽  
pp. 201-208
Author(s):  
Ruaa A. Salman ◽  
Naser K. Zedin
Keyword(s):  
Wear Resistance ◽  
Fly Ash ◽  
Wear Rate ◽  
Wear Behavior ◽  
Weight Percent ◽  
Al Alloy ◽  
Sliding Speed ◽  
Multiple Addition

This research is devoted to study the effect of addition (2%) TiO2 with different weight percent of fly ash particulate (0, 2, 4, 6%) to 2024 Al alloy on the wear behavior and hardness. The alloy was fabricated by the liquid metallurgy method. The results founds that the wear rate decreased from 0.55 with 0% fly ash to 0.18 at addition percentage of 6% fly ash. Also, the results reveal increasing the samples wear rate with increasing the load and loaded time. The rate of wear was decreased with increasing the sliding speed. Also, the values of hardness increased from 120VH to 160VH with rising the fly ash from 0% to 6%. Keywords: Fly Ash addition, TiO2, 2024 Al Alloy, Wear Resistance, Hardness.

Investigation of friction and wear behavior of hydroxyl-functionalized graphene nanoplatelets filled elastomer nanocomposites

2021 ◽  
pp. 146442072110616
Author(s):  
Hasan Kasim ◽  
Adem Onat ◽  
Barış Engin ◽  
İsmail Saraç
Keyword(s):  
Wear Rate ◽  
Tribological Properties ◽  
Wear Behavior ◽  
Normal Load ◽  
Graphene Nanoplatelets ◽  
Rubber Matrix ◽  
High Wear Resistance ◽  
Homogeneous Distribution ◽  
Functionalized Graphene ◽  
Sealing Elements

The use of unfilled pure elastomer parts is limited in friction wheels, roller tires, sealing elements, and dynamic friction air suspension applications requiring high wear resistance. This study investigates the mechanical and tribological properties of new nanocomposites obtained by adding hydroxyl-functionalized graphene nanoplatelets at 1, 4, and 8 phr (parts per hundred rubber) ratios to the carbon black filled main rubber compound of sealing elements designed for axle hubs. The synergistic effect of nanofiller materials on the wear behavior of nanocomposites was tested with a block-on-ring wear tester under dry sliding conditions at 1000 rpm and 15 N normal load conditions. The worn surfaces were examined with scanning electron microscopy and circularly polarized light–differential interference contrast topology microscopy to reveal the wear mechanism. The addition of functionalized graphene nanoplatelets to the nanocomposite compound caused significant changes in tensile strength and elongation values by changing the cross-link density. The wear rate of nanocomposites prepared with graphene nanoplatelets at 1, 4, and 8 phr ratios was 11.15%, 25.24%, and 36.54% lower than the main rubber mixture used, respectively. While the hysteresis loss decreased by 14.83% at 1 phr, this value increased in other filler ratios. Significant differences in temperature change occurred as the amount of filler increased. After the test, the temperature values of nanocomposites with 1 and 4 phr filler ratios were between about 85–89°C, while it was measured as 99°C in nanocomposites with 8 phr filler ratios. It has been observed that the homogeneous distribution of two-dimensional carbon allotropes such as graphene nanoplatelet added to the rubber matrix at the optimum rate will improve tribological properties such as better surface lubrication, low wear rate, and low friction coefficient.

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