Inorganic solid lubricating coatings for heat engines and power plants

Lesnevskiy, L. N.; Lezhnev, L. Yu.; Lyakhovetskiy, M. A.; Troshin, A. E.; Gavrilov, P. V.; Ushakov, A. M.

doi:10.3103/s1052618815040093

Cited by 4 publications

(3 citation statements)

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“…The modulations of gas pressure moment and output shaft torque values in AED RPEs are shown in Figures 7, 8, and 9. The true power of the selected engine according to the work results [9] equals: # = 64,7 kW for a one-chamber and # = 129, 5 kW for a two-chamber AED RPE.…”

Section: Resultsmentioning

confidence: 99%

“…The use of the classic combined lubrication system typical of four-stroke engines is more complicated in free-piston engines due to the presence of valves in the working area of compression and oil rings (in some of the engines), which requires special attention to the development of lubrication systems. One of the most promising technical solutions of today is the use of both the low performance combined lubrication system and solid films applied to the friction parts which improved the economic, environmental, and operating life indices of ICEs [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Advanced engines for non-conventional kinematic chains in agriculture

et al. 2020

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To intensify agricultural production in the market environment, it is necessary to reconstruct the whole economic mechanism considering energy efficiency. This calls for the search of new ideas for alternative designs and engine types that can raise the performance of heat engines to a new level while keeping their use in vehicles, machinery, and small energy facilities feasible. One of the options is the displaced shaft rotary engine. This article analyses the kinematic and dynamic metrics of the engines of this type and presents the calculations of these metrics for the prototype. Key advantages and disadvantages of this type of engine in terms of working process dynamics are set out. It is also compared to the reciprocal internal combustion engine of the same structural dimensions.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Advanced engines for non-conventional kinematic chains in agriculture

et al. 2020

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“…In particular, a comparison of these approaches indicates the effectiveness of the technological approach associated with the development of compositions and methods of the deposition of anti-friction coatings, surface modification [6], and the formation of a regular microrelief on the friction surfaces [7] when using modified motor oils. However, the application of solid lubricating coatings is the most promising because they make it possible to combine the most positive properties of three approaches under consideration, particularly under the condition of the continuous toughening of the operating conditions of the parts and units of engines and power plants [8].…”

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confidence: 99%

Wear resistance of composite plasma coatings with graphite

Lesnevskii¹,

Lezhnev

Lyakhovetskii³

et al. 2017

J. Mach. Manuf. Reliab.

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The wear-resistant composite solid lubricant coatings formed by atmospherec plasma spraying method of cladding Ni[Cg] powder in relation to the extreme working conditions of friction units of aircraft engines and power plants have been investigated. Examples of studies of technological processes of the plasma spraying of protective coatings on elements of liquid-propellant rocket and gas turbine engines have been given, and the possibilities of sealing technologies to increase their service life have been shown. The evaluation of efficiency of coatings obtained by plasma spraying from mechanical mixtures of powders based on Ni[Cg] in relation to power plants of vehicles based on freepiston engines.It is known that composite materials obtained by plasma spraying from the cladding by nickel powders of graphite, boron nitride BN, and calcium fluoride CaF 2 are effectively used for extreme operating conditions of friction units, seals, and structural elements of modern aircraft engines and power plants for vehicles. A comparative analysis of these materials used as the solid lubricant coatings [1] has shown that graphite-metal mixtures with a volume content of graphite within 10-35% obtained by plasma spraying from cladding Ni[Cg] powder are the most effective.The plasma coatings based on cladding nickel-graphite powder Ni[Cg] traditionally belong to the class of materials that are worn out and abradable, but resistant to erosion, oxidation, and temperature. They are used to line the inserts of the gas turbine engine stator, as well as abraded and run-in during the beginning of blade rotation, as well as sprayed on the construction elements of labyrinth seals of various types in order to ensure the minimum radial and/or axial clearance. The use of these coatings significantly reduces the leakage of air and working gas through clearances and increases the engine efficiency, but also greatly simplifies the assembly process and facilitates the repair and reinstatement of inserts and labyrinth seals.However, the use of coatings based on Ni[Cg] as antifriction coatings, which ensures the designed wear resistance in friction units, such as the sealing rings of pumps, the rotary sleeves of blades, combustion engine cylinders, and other similar friction pairs, is extremely limited. In these cases, this mean that antifriction coatings based on Ni[Cg] that work with minimal coefficients of friction prevent the seizure of metals and have lubricating ability with the minimum possible wear.In this article, the results of a study of the coatings based on Ni[Cg] powder have been proposed for use as wear-resistant solid lubricant coatings in manufacturing and repair technologies to ensure the protection of constructive units of products working under wear conditions in a wide range of temperatures and pressures. Ni[Cg] powder belongs to the class of composite cladding powders (or powders with coating). The initial materials of powder particles are as follows: the core is graphite and the cover is nickel Ni. Three types of domestic N...

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Mechanical Properties of Surface Structures of Titanium Alloy Vt9 After Repeated Local Processing With Nanosecond Laser Pulses

Simonov

Ushakov

2020

Bulletin of the MSRU (Physics and Mathematics)

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Аннотация. Целью работы является исследование закономерности одновременного повышения микротвёрдости и пластических свойств поверхности титанового сплава ВТ9, а также определение твёрдости и модуля Юнга тонких поверхностных слоёв. Процедура и методы исследования. Методы обработки основаны на применении короткоимпульсного наносекундного лазерного излучения, инициирующего комплекс физико-химических процессов. По результатам метода непрерывного индентирования с максимальной нагрузкой 0,05 Н проанализированы механические свойства поверхностных структур титанового сплава ВТ9, сформированных при различных режимах лазерной обработки. Результаты исследования. На основе диаграмм «нагрузка-проникновение» проведены расчёты следующих величин: контактной глубины внедрения, жёсткости контактной пары «индентор-материал», площади проекции невосстановленного отпечатка, эффективного модуля Юнга. По методу Оливера-Фарра оценены нано-и микротвёрдость, а также модуль продольной упругости поверхностных слоёв титанового сплава. Установлено, что в результате обработки микротвёрдость поверхности увеличивается в 2,5-4,5 раза, а модуль Юнга в 1,1-1,5 раза. Отличительной особенностью предложенного метода обработки является хорошая адгезия поверхностного слоя с основным материалом, что снижает вероятность формирования высоких механических напряжений и трещин. Теоретическая и практическая значимость. Предложенный метод лазерной обработки позволяет формировать упрочнённые поверхностные слои в обычной атмосфере, что способствует существенному упрощению технологического процесса и снижению его себестоимости.

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Inorganic solid lubricating coatings for heat engines and power plants

Cited by 4 publications

References 4 publications

Advanced engines for non-conventional kinematic chains in agriculture

Advanced engines for non-conventional kinematic chains in agriculture

Wear resistance of composite plasma coatings with graphite

Mechanical Properties of Surface Structures of Titanium Alloy Vt9 After Repeated Local Processing With Nanosecond Laser Pulses

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