scholarly journals Method for studying the parameters of the surface hardening of parts with a protective coating

Author(s):  
П.А. Бимбереков ◽  
А.О. Токарев ◽  
Е.С. Федотова

Поверхностные покрытия деталей получили широкое распространение в технике, в том числе для судовых энергетических установок, а также вспомогательных судовых механизмов и устройств. Для экспериментального исследования работоспособности деталей на контактные силовые воздействия используются как цельные образцы, разделяемые после силового воздействия в месте его приложения, так и составные образцы, силовое воздействие на которые производится в месте стыка отдельных элементов. В последнем случае деформирующее разделение образца и получение нежелательных дополнительных пластических деформаций в ходе разделения исключаются. При обеспечении равной точности результата этих методов второй является более надёжным, не требующим контроля побочных деформаций для анализа зоны деформации получаемой от планового силового контактного воздействия. Нанесение поверхностного слоя осложняет использование составных образцов при исследовании зон пластической деформации Процедура их получения и испытания может быть усовершенствована. Предлагаются варианты формирования образцов, а также способы их получения и использования. Делается заключение об упрощении процедуры экспериментальных исследований при использовании предлагаемых образцов и получении более достоверных результатов. Обращается внимание на возможность одновременного ведения испытания для разных материалов деталей, что предполагает сокращение расхода наносимого материала покрытия и трудоёмкости работ. Surface coatings of parts are widely used in engineering, including for ship power plants, as well as auxiliary ship mechanisms and devices. For experimental study of the performance of parts for contact force effects, both whole samples that are share separated after the force action at the place of its application, and composite samples that are subjected to force action at the junction of individual elements are used. In the latter case, deforming separation of the sample and unwanted additional plastic deformations during separation are excluded. While ensuring equal accuracy of the results of these methods, the second method is more reliable and does not require control of side deformations for analyzing the deformation zone affected by the planned force contact action. The application of a surface layer complicates the use of composite samples in the study of plastic deformation zones. Procedure for obtaining and testing them can be improved. Options for forming samples, as well as ways to obtain and use them are offered. The conclusion is made about simplification of the experimental research procedure when using the proposed samples and obtaining more reliable results. Attention is drawn to the possibility of simultaneous testing for different materials of parts, which implies a reduction in the consumption of the coating material applied and the complexity of work.

2021 ◽  
Vol 698 (1) ◽  
pp. 012029
Author(s):  
Suntoyo ◽  
Taufiq Wibawa Muslim ◽  
Febrian Tegar Wicaksana ◽  
Shade Rahmawati ◽  
Silvianita

2010 ◽  
Vol 150-151 ◽  
pp. 753-757 ◽  
Author(s):  
Xiong Hao Li ◽  
Yong Jie Xue ◽  
Min Zhou

This paper discussed the feasibility of unburned and non-autoclaved, steam cured bricks prepared by FGD byproducts from coal-fired power plants. The results show that FGD byproduct, aggregates, cementious materials and water could be used to prepare bricks during the process of stir and compaction under natural cure and steam cured condition. S4 and Z2 are the optimum design mixture composition. The maximum compressive strength and saturation coefficient are 28.7 MPa and 96.7%. FGD byproducts do no harm to environment and a pilot-scale experiment demonstrates that bricks made with FGDA can meet the MU10 level bricks technical requirement.


Author(s):  
V.A. Altunin ◽  
K.V. Altunin ◽  
M.R. Abdullin ◽  
M.R. Chigarev ◽  
I.N. Aliev ◽  
...  

The paper discovers the reasons for the transfer of single-use or reusable ground, air, aerospace, and space-based engines and power plants from liquid hydrocarbon fuels and coolers to gaseous fuels, or rather, to liquefied natural gas methane. The study gives specific examples of creating a new technology and using methane fuel and fuel in the existing units; lists the classes of methane engines and power plants, among which the main ones being piston engines and internal combustion power plants, air-jet engines and power plants, liquid propellant rocket engines and power plants. Findings of research show that it is necessary to experimentally study gaseous methane, so that it could be effectively used in advanced single-use or reusable ground, air, aerospace and space-based engines and power plants, and their features should be taken into account when designing and developing new technologies. The study introduces the results of the experimental study of thermal processes in gaseous methane during its natural convection, describes the experimental base in detail, as well as the procedure for conducting experiments, and develops methods for calculating the heat transfer coefficient to gaseous methane relying on the research results.


2019 ◽  
Vol 109 ◽  
pp. 00119
Author(s):  
Volodymyr Yemelianenko ◽  
Vitalii Pertsevyi ◽  
Oleksandr Zhevzhyk ◽  
Iryna Potapchuk ◽  
Oleksandr Lutai

Analysis of the perspectives of the coal fuel for thermal power plants is carried out. The necessity of the experimental study for temperature measurement in the boiler furnace. The results of the experimental study are presented: temperature change over time at the burner outlet for different constant pressure value of the backlighting gas, dependence of the temperature at the burner outlet from the backlighting gas pressure for constant concentration value of pulverized coal in coal-air mixture, dependence of the temperature at the burner outlet from the concentration of pulverized coal in coal-air mixture for constant value of the backlighting gas pressure, temperature measurements for constant backlighting gas pressure value, constant value of the concentration of pulverized coal in coal-air mixture when plasmatron is switched and operates for some time range. The results of the study could be applied to the solid fuel treatment for different thermal units.


2017 ◽  
Vol 5 (1) ◽  
pp. 71-86
Author(s):  
Muna S. Kassim ◽  
Ammar Fadhil Hussein Al-Maliki

Internal combustion engine is a major source of noise pollution. These engines are used for various purposes such as, in power plants, automobiles, locomotives, and in various manufacturing machineries. The noise is caused by two reasons; the first reason is the pulses which created when the burst of high pressure gas suddenly enters the exhaust system, while the second reason is the friction of various parts of the engine where the exhaust noise is the most dominant. The limitation of the noise caused by the exhaust system is accomplished by the use of silencers and mufflers. The aim of this study is the reduction of the noise by changing its inlet and outlet pipe length and shape. Also the losses in noise for different length and shapes have been investigated experimentally. The results show that the corrugated pipe is preferable for noise reduction.


2021 ◽  
Vol 236 ◽  
pp. 88-98
Author(s):  
Shuangchen Ma ◽  
◽  
Lin Qiao ◽  
Lei Li ◽  
Baozhong Qu ◽  
...  

1961 ◽  
Vol 83 (2) ◽  
pp. 133-138 ◽  
Author(s):  
D. J. Baldwin ◽  
G. W. Rowe

An experimental study of the friction of metals which have been coated with inorganic films by reaction with their surrounding atmosphere. The specimens are first cleaned at high temperature in vacuo and then heated in the selected reactive vapor. Many coatings will prevent seizure and give a fairly constant but high coefficient of friction up to high temperatures. Layer-lattice compounds such as MoS2, CrCl3, and TiI2 give much lower friction at all temperatures below those at which the film decomposes or evaporates (about 850 C for molybdenum disulphide). A film of boron nitride formed on boron shows a high intrinsic friction, but this can be reduced by certain vapors or by raising the temperature above about 800 C. Most of the experiments were performed with very light loads but the films are shown to be effective under kilogram loads. A simple indentation test capable of selecting lubricants under loads up to 12 tons is described. This shows that a film formed by heating stainless steel in CCl2F2 will lubricate at 400 C when the steel is deformed by over 50 per cent.


2020 ◽  
Author(s):  
Mikhail P. Tretyakov ◽  
Tatiana V. Tretyakova ◽  
Ekaterina M. Zubova

2014 ◽  
Vol 57 ◽  
pp. 2131-2138 ◽  
Author(s):  
Maira Lorena Trejos Moncada ◽  
Beatriz Cruz Muñoz ◽  
M. Miki Yoshida ◽  
Rubén Dorantes Rodríguez

2014 ◽  
Vol 70 (2) ◽  
pp. 1288-1293 ◽  
Author(s):  
Peter Görbe ◽  
Attila Fodor ◽  
Attila Magyar ◽  
Katalin M. Hangos

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