scholarly journals TRIBOLOGICAL PROPERTIES OF AL2O3-ZrO2 COMPOSITE COATING BY LUBRICATION

SINERGI ◽  
2021 ◽  
Vol 25 (3) ◽  
pp. 371
Author(s):  
Riyadh A. Al-Samarai ◽  
Haftirman Haftirman
Keyword(s):  
Electron Microscopy ◽  
Wear Resistance ◽  
Abrasive Wear ◽  
Rotational Speed ◽  
Internal Combustion Engines ◽  
Plasma Coating ◽  
Combustion Engines ◽  
Motor Oil ◽  
20 Nm ◽  
Improve Wear Resistance

Tribological investigations had been carried out on the plasma coating (Al2O3+ ZrO2) below dry and moist abrasion stipulations according to ASTM G134. Commercial motor oil 20W40 was used as a lubricant. At a rotational speed of 200 rpm, all experiments were carried out with ordinary loads of 10, 15 and 20 Nm. Electron microscopy for scanning and AFM was used to study of the layer sprayed with paint. The outcomes of the SEM and AFM evaluation confirmed that abrasive wear is normally decided by abrasive wear in dry abrasive conditions. The lubrication and moisture check confirmed a major reduce in wear from 10 to 15 N below regular loading, and a corrosion fee larger than 15 N was once discovered below regular loading. No impact of lubrication on wear used to discovered at high loading. No impact of lubrication on wear used to be discovered at high loads. It was also cited that the plasma coating manner to improve wear resistance. The experimental statistics acquired in this study are tremendous engineering functions such as reducing equipment and internal combustion engines. 

scholarly journals Diagnostics of the Internal Combustion Engines Operation by Measurement of Crankshaft Instantaneous Angular Speed

2019 ◽  
Vol 49 (4) ◽  
pp. 281-295
Author(s):  
Mirosław Dereszewski ◽  
Grzegorz Sikora
Keyword(s):  
Rotational Speed ◽  
Internal Combustion Engines ◽  
High Sensitivity ◽  
Relative Displacement ◽  
Angular Speed ◽  
Injection System ◽  
Combustion Engines ◽  
External Disturbances ◽  
Active Measurement ◽  
First Results

Abstract Diagnostics based on measuring of crankshaft instantaneous rotational speed allows precise location of damage to the injection system and detection of external disturbances. Active measurement of instantaneous rotational speed requires use of equipment with high sensitivity, permanent assembly at the ends of the crankshaft and the analysis of a very large amount of data. Presented method can be used for measurement of torsional vibration of crankshaft, indirectly through simultaneous measurement of the width of the pulses generated by the encoder disks. Momentary, relative displacement of both disks determines the angle of temporary crankshaft twisting. This paper presents first results of pulse width measurement, obtained by using described system.

scholarly journals Measurement of flow and pressure characteristics of combustion engine oil filters

2021 ◽  
Vol 351 ◽  
pp. 01004
Author(s):  
Ľubomír Hujo ◽  
Matej Michalides ◽  
Jozef Nosian ◽  
Mirko Simikić
Keyword(s):  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Engine Oil ◽  
Motor Vehicles ◽  
Combustion Engines ◽  
Motor Oil ◽  
Filtration Equipment ◽  
Motor Oils ◽  
The Given ◽  
Pressure Characteristics

For the purpose of measuring the flow and pressure characteristics of oil filters used in vehicles with internal combustion engines, a laboratory test equipment was used, which was designed at the Department of Transport and Handling of the Slovak University of Agriculture in Nitra. The target information from the given measurement is the obtained data on the change of flow and pressure, based on the type of oil filter used. The contribution of this paper is information that can be used in the future in the design of new filtration equipment, as well as the creation of a system for evaluating the technical life of motor oils, in order to extend the service intervals of motor oil, monitored set of motor vehicles.

A Modality to Optimize Common Functioning of a Pressure Wave Supercharger with an Internal Combustion Engine

2015 ◽  
Vol 772 ◽  
pp. 350-354
Author(s):  
Cristian Ioan Leahu ◽  
Anghel Chiru ◽  
Stelian Tarulescu
Keyword(s):  
Rotational Speed ◽  
Pressure Wave ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Driving Speed ◽  
Optimal Values ◽  
Different Characteristics ◽  
Correlation Grade

The functional constructive variants of the Hyprex and Comprex compressors with pressure wave built until the present are reduced in number. Starting from this ascertainment, the paper proposes to highlight the optimization on joint functioning of existing pressure wave supercharger models with internal combustion engines. This is possible due to the efficiency of the supercharging process, realized with such superchargers, which depends on the correlation grade between the rotational speed of the supercharger and the pressure of the exhaust gasses that enter in the compressor's channels, reason due to, a single supercharger model can be capable to supercharge efficiently engines with different characteristics, if the optimal values for the driving speed of the pressure wave supercharger are identified (according to the method proposed in the work) and adapted (according the level of energetic and/or ecologic performances that the engine should achieve) for each type of engine apart.

Evaluation of Wear Resistance of Ti Alloys Used for Elements Friction of Knee Endoprosthesis

2014 ◽  
Vol 225 ◽  
pp. 123-130
Author(s):  
Beata Majkowska ◽  
Magadalena Jażdżewska ◽  
Damian Miotke ◽  
Emilia Wołowiec ◽  
Andrzej Zieliński
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Titanium Alloys ◽  
Rotational Speed ◽  
Constant Load ◽  
Test Duration ◽  
Ringer’S Solution ◽  
Ti Alloys ◽  
New Generation ◽  
Knee Endoprosthesis

The paper presents research results of resistance to abrasive wear of titanium alloys: Ti6Al4V (commonly used) and Til3Nb13Zr (alloy of new generation) in association with polyethylene (UHMW-PE) predisposed for elements on pair of the knee endoprosthesis. The results were analysed from the point of possibility of an use of new generation titanium alloys as components of such implants. The tests of resistance to abrasive wear of selected kinematic pairs were conducted with the PT-3 tribometer in Ringer’s solution a constant load 2.0 kN, rotational speed of the rotating specimens (Ti13Nb13Zr and Ti6Al4V) 30 rev/min, and test duration 1 or 2 hrs.

Methane Combustion Using CeO2-CuO Fibers Catalysts

2012 ◽  
Vol 1446 ◽  
Author(s):  
Felipe A. Berutti ◽  
Raquel P. Reolon ◽  
Annelise K. Alves ◽  
Carlos P. Bergmann
Keyword(s):  
Cerium Oxide ◽  
Internal Combustion Engines ◽  
Methane Combustion ◽  
Polyvinyl Butyral ◽  
Acetate Solution ◽  
Combustion Engines ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Bet Method ◽  
20 Nm

ABSTRACTThe use of three-way catalysts is an accepted method to minimize NOx and CO emissions generated by internal combustion engines. These catalysts are generally formed by the support, stabilizers, promoters metal and transition metals, the most used metals of the platinum group. The use of cerium as a promoter is usually related to its ability to store oxygen and structural aspects such as the property of increasing the dispersion of metals and slow change of phase of the stabilizing support. On the other hand, the metal copper was explored as a possible replacement for palladium and platinum in the reduction of NO by CO. In this work, fibers of cerium oxide doped with copper were obtained from an acetate solution of cerium and coppers nitrates and polyvinyl butyral (PVB). This solution went through the process of electrospinning to produce nanostructured fibers. After heat treatment, cerium oxide fibers were obtained. These fibers were characterized structurally by scanning electron microscopy (SEM), had their specific surface area determined by BET method, were subjected to thermogravimetric test to determine their thermal decomposition and were analyzed by X-ray diffraction. The catalytic activity was assessed by the amount of O2 consumed and CO and CO2 formed for the combustion of methane and air. SEM images show fibers oriented randomly in the substrate. TEM images show that the diameter of the fibers is approximately 100 nm and the size of its crystallites are around 20 nm. In the presence of the catalyst, the combustion reaction started around 500°C, with the consumption of methane and oxygen and the formation of CO and/or CO2. There was no emission of NO and NOx gases during the tests with catalysts.

Better at What?

2010 ◽  
Vol 3 (3) ◽  
pp. 340-343 ◽  
Author(s):  
Craig J. Russell
Keyword(s):  
Internal Combustion Engines ◽  
Cost Effective ◽  
Internal Combustion ◽  
Theory And Practice ◽  
Combustion Engines ◽  
Motor Oil ◽  
Synthetic Motor ◽  
Strongly Agree ◽  
Better Than

In reading the title of Johnson et al.'s (2010) article on synthetic validity, I immediately asked myself “Better at what?” Motor oil serves three functions in internal combustion engines: lubricate, cool, and clean engine parts. There is little doubt that synthetic motor oil does all three of these better than nonsynthetic motor oil, although some might argue that it is not as cost effective. Johnson et al. described two approaches to synthetic validity and then argued why synthetic validity is “the best approach for many situations.” I strongly agree with their contention that synthetic validity is “practically useful” and with their less directly stated contention that it also holds value in developing theory. Hence, I will limit my comments exactly to how synthetic validity inferences might best contribute to the complimentary goals of advancing theory and practice, although these might cause Johnson et al. to rethink some of their observations.

Improving the Wear Resistance of Piston Rings of Internal Combustion Engines when Using Ion-Plasma Coatings

2020 ◽  
Vol 854 ◽  
pp. 133-139
Author(s):  
V.A. Krasnyy ◽  
Vyacheslav V. Maksarov ◽  
D.D. Maksimov
Keyword(s):  
Plasma Spraying ◽  
Internal Combustion Engines ◽  
Plasma Coating ◽  
Internal Combustion ◽  
Molybdenum Nitride ◽  
Combustion Engines ◽  
Piston Rings ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Ion Plasma

Modern designs of piston rings of internal combustion engines and wear-resistant coatings used for them are considered. It is noted that the upper (compression) ring undergoes the most intense wear. Among the traditionally used wear-resistant coatings of compression rings, galvanic chrome plating and thermal spraying with molybdenum are most often used. The paper proposes the use of the ion-plasma spraying method for applying hard wear-resistant coatings to the working surface of piston rings based on titanium and molybdenum nitrides. The specified method relates to vacuum coating technologies (PVD methods), in which layers of high-strength materials are sprayed directly onto the surface of the product. The present work aimed to carry out comparative tribotechnical tests of piston ring samples having hard coatings obtained by ion-plasma spraying and to compare them with traditional galvanic chromium plating. A technique has been developed for a comprehensive assessment of comparative tribological characteristics, including the critical load during testing, the specific load of seizing, the coefficients of friction, scoring resistance, and wear resistance. The test results of samples with the galvanic coating with chromium, ion-plasma spraying with titanium nitride, and molybdenum nitride are shown. In contrast, it is shown that samples with an applied ion-plasma coating surpass samples that are electrolytically chrome plated by all tribological parameters. The results obtained allow concluding that the ion-plasma coating of molybdenum nitride is promising for piston rings, as well as other critical parts of internal combustion engines.

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