Ceramic Coatings in Internal Combustion Engines

2021 ◽

pp. 37-41

Author(s):

A. V. Chavdarov

Keyword(s):

Internal Combustion Engines ◽

Combustion Engine ◽

Internal Combustion ◽

Ceramic Coatings ◽

Combustion Engines ◽

Repair Work ◽

Nano Crystalline ◽

Micro Arc Oxidation ◽

Restoration Work ◽

Crystalline Ceramic

The prospects of using nano-crystalline ceramic coatings on internal combustion engine parts obtained by micro-arc oxidation (MDO) technology are considered. The tendency of development of engine building on replacement of cast-iron blocks and sleeves on aluminum with the special coverings received by galvanic methods is shown. It is noted that this direction does not involve the use of repair technologies, which significantly affects consumers. Analysis and practical tests have shown the possibility of using MDO technology both in the manufacture of engine parts and for the performance of restoration work. It is concluded that it is necessary to introduce this technology into the mass production of engines and pistons, as well as the need to develop a set of equipment for repair work.

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Microstructural Aspects of TBC`s Deposited on Internal Combustion Engine Valve Materials

Materials Science Forum ◽

10.4028/www.scientific.net/msf.907.151 ◽

2017 ◽

Vol 907 ◽

pp. 151-156 ◽

Cited By ~ 5

Author(s):

Marius Panțuru ◽

Daniela Chicet ◽

Constantin Paulin ◽

Ștefan Lupescu ◽

Corneliu Munteanu

Keyword(s):

Internal Combustion Engines ◽

Combustion Engine ◽

Internal Combustion ◽

Ceramic Coatings ◽

Operating Conditions ◽

Atmospheric Plasma ◽

Thermal Barrier ◽

Low Alloy Steels ◽

Combustion Engines ◽

Surface Appearance

The discs of the intake or exhaust valves are vital organs of internal combustion engines, being subjected to extreme operating conditions, thermal, mechanical and chemical types. One of the goals of researches in this area is related to thermal insulation of the combustion chamber of internal combustion engines, which could enhance their performance in operation. In this article we analysed the microstructural aspects of some coatings obtained from powders with thermal barrier role on specific materials for internal combustion engines valves. There were used as substrate samples of low alloy steels with Si and high alloyed steels with Cr, Ni and Mn. Using the facility SPRAYWIZARD 9MCE for atmospheric plasma spraying, two types of thermal barrier coatings were produced, from powders based on zirconia and alumina. The samples were analyzed in terms of microstructure using the QUANTA 200 3D scanning electron microscope and the X`PERT PROMD diffractometer. Observations were made both on the longitudinal surface of the coating in order to evaluate it and on the cross-section to evaluate the substrate-coating interface, the influence of deposition temperatures on the substrate and aspect/microstructure on its depth. XRD analysis revealed a cubic structure of aluminum oxide, respectively zirconium oxide. The identified morphology is a specific "splat" one for the ceramic coatings. Surface appearance shows tiny pores and cracks specific to the spraying method. The resulted coatings present a significant compactness and adherence to the substrate, which recommends them for further thermal behaviour testing.

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Cordunum pistons increase diesel engine economy and reliability

Acta Innovations ◽

10.32933/actainnovations.33.3 ◽

2019 ◽

pp. 28-37

Author(s):

Andriy Marchenko ◽

Volodymyr Shpakovskyy ◽

Volodymyr Volikov

Keyword(s):

Diesel Engine ◽

Fuel Consumption ◽

Diesel Engines ◽

Internal Combustion Engines ◽

Internal Combustion ◽

Ceramic Coatings ◽

Fuel Combustion ◽

Combustion Engines ◽

Piston Group ◽

Cylinder Piston

Taking into account the oil resources depletion the requirements to fuel consumption of internal combustion engines are now increasing as well as to their reliability and durability. With the continual increase in the number of internal combustion engines in operation, along with the problem of parts of the cylinder piston group wearing out has caused exhaust from such engines to be one of the main source of harmful pollutant emissions in cities. Therefore, environmental requirements have in turn increased dramatically. The engine resource and its efficiency largely depend on the process of fuel combustion in the combustion chamber. Experimental studies aimed to improve the working process on diesel engines by piston insulation have shown an effective decrease in fuel consumption by reducing heat loss and more complete fuel combustion. When oxide ceramic coatings were used on the piston and cylinder head, the maximum power increased and the specific fuel consumption decreased. However ceramic coatings are not widely used due to their peeling. We have developed a technology for the galvanic plasma treatment of pistons, which made it possible to obtain on the pistons surface made of aluminum alloys a ceramic corundum layer with high adhesion to the base metal that does not peel and has electret properties. In 1993, pistons with a corundum surface layer were installed in a shunting diesel locomotive and life-time running tests were conducted. Such pistons increased wear resistance, reduced the wear of cylinder liners, increased the strength of the annular jumpers, and were not prone to burnouts and scuffing. They provided an increase in the resource of the cylinder-piston group of the diesel engine by more than 125 thousand engine hours. The paper provides an analysis of the effect of corundum pistons thermal insulation on significant increasing the, engine power and fuel consumption reduction. Basing on experimental bench studies of a gasoline engine, a tractor diesel engine and long-term operational life tests of diesel engines, an attempt had been made to explain the reasons for the improvement in the engines’ efficiency.

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