scholarly journals Development of technology for manufacture of bimetal camps of ship diesels

2018 ◽  
pp. 163-169
Author(s):  
O. Stalnichenko ◽  
B. Smazhylo ◽  
R. Kotenko
Keyword(s):  
Surface Layer ◽  
Mechanical Treatment ◽  
Low Cost ◽  
High Hardness ◽  
Wear Resistant ◽  
Wear Resistant Coatings

The results of the development of the technology for the manufacture of bimetallic fuselage washers of marine ICE, which assumes the basis of the washer to be made from low-cost steels with the application of a high-hardness surface layer on the cams instead of cementation. To implement the idea, a number of mechanisms and devices have been developed and manufactured that have enabled the application of wear-resistant coatings and mechanical treatment of paddles.

The Preparation and Performance of Wear-Resistant Coatings

2013 ◽  
Vol 833 ◽  
pp. 378-382
Author(s):  
Cheng Zhang ◽  
Yue Ting Ding ◽  
Xia Sun ◽  
Shu Guang Wang
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Good Effect ◽  
Polymeric Coatings ◽  
Reinforced Polymers ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Damage And Failure ◽  
And Performance ◽  
Commercial Applications

Polymers and their composites are extensively used in commercial applications[.Wearing is one of the forms which makes materials damage and failure, especially the materials by friction, impact, erosion like rocks, minerals etc, the wear caused huge losses. Therefore, high-strength wear-resistant engineering machinery rational use of materials is very important. So chose a method that simple, rapid, low cost, good effect to prevent and repair the parts wear is necessary. In recent years, there has been much interest in particle-reinforced polymers not only because to produce this kind of polymer is cheaper, but also they can be used as high quality engineering materials[2]. In abrasive wear, the low stress also occupied a certain proportion of erosion[. Current polymeric coatings, although corrosion resistant, do not satisfactorily resist wear, but these studies provided many ways to improve the erosion resistance of particle-reinforced polymers[410].

Microstructure and Properties of Carbonitride Alloying Self-Shielded Wear-Resistant Coatings by HVAS

2011 ◽  
Vol 314-316 ◽  
pp. 33-40
Author(s):  
Yu Deng ◽  
Sheng Fu Yu ◽  
Shu Le Xing ◽  
Lin Bing Huang
Keyword(s):  
Low Carbon Steel ◽  
High Hardness ◽  
Low Carbon ◽  
Compact Structure ◽  
Cored Wire ◽  
Wear Performance ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Microstructure And Properties ◽  
The Wire

A kind of self-shielded carbonitride alloying flux-cored wire was developed. Wear resistant coatings was prepared on the surface of the Q235 low-carbon steel by HAVS using the wire. Detection and analysis on the microstructure and properties of the coatings were done by the equipments such as scanning electron microscope, microhardness tester and wear tester. The forming, the wear resistance and its mechanism of the coating were studied. The results show that the coating has good forming property, uniformity of microstructure and compact structure, but the coating also has large oxidate and porosity, this may due to gasforming and slagforming constituents in the wire; the coatings has high hardness, the average microhardness value reachs 510 HV0.1, and the highest value up to about 560 HV0.1; the coatings has good abrasive wear performance and bonding strength.

MATHEMATICAL MODEL OF ELECTROSPARK FORMATION OF WEAR-RESISTANT COATINGS ON PROCESSED SURFACES

2021 ◽  
Vol 3 (144) ◽  
pp. 108-115
Author(s):  
Said N. Sharifullin ◽  
◽  
Ayzat S. Akhmetzyanov ◽  
Tat’yana V. Toporkova
Keyword(s):  
Mathematical Model ◽  
Surface Layer ◽  
Chemical Properties ◽  
Research Purpose ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Working Bodies ◽  
Percent Cobalt ◽  
Physical And Chemical ◽  
Agricultural Machines

The article considers a new direction in optimizing the process of plasma hardening of the surfaces of cutting elements of agricultural machines based on the use of electric spark discharge energy. (Research purpose) The research purpose is in optimizing the technological process of hardening the surfaces of cutting elements of agricultural machines by the method of electric spark alloying of carbide material elements. (Materials and methods) A device under RF patent No. 2655420, developed by the scientific supervisor of the subject S. N. Sharifullin, was used for electric spark alloying. A tungsten-cobalt rod with a diameter of 4 millimeters, consisting of 94 percent tungsten and 6 percent cobalt, was used as the electrode material for this case. The processed sample of 65G steel, which is the main material of the working bodies of tillage equipment. The physical and chemical properties of the samples were studied with a scanning electron microscope EVO 50 XVP from Zeiss. (Results and discussion) After the electric spark treatment of the alloyed elements, there were about ten, while their spectra also appear at different irradiation energies. The alloyed elements in the surface layer are not only separate, but also in the form of compounds with other elements. Such alloying elements as carbon, cobalt and tungsten appeared in a noticeable amount in the surface layer. Electric spark treatment allows increasing the microhardness of the surfaces of cutting elements of tillage equipment up to three times. (Conclusions) When developing a mathematical model of the electric spark formation of wear-resistant coatings on the treated surfaces, it is necessary to use the energy conservation equations of the electron gas, the Maxwell equations, the continuity and momentum equations. The complex solution of these equations makes it possible to obtain the required output parameters depending on the input ones.

scholarly journals The effect of the preheating on to properties of the wear resistant welds

2020 ◽  
Vol 92 (2) ◽  
pp. 7-14 ◽  
Author(s):  
Marek Gucwa ◽  
Jerzy Winczek ◽  
Miloš Mičian
Keyword(s):  
Surface Layer ◽  
Main Parameter ◽  
Heating Temperature ◽  
High Hardness ◽  
Operating Conditions ◽  
Wear Resistant ◽  
Optimum Heating

Wear resistant welds are used in many industries when it is necessary to protect machine components and structures against wear caused by operating conditions. Often the main parameter determining the usefulness of these welds is high hardness reaching about 60HRC. In many cases, after the surfacing process, a mesh of cracks is formed in the surface layer, which can affect the durability of the hard-wearing layers used. The paper presents the analysis of the influence of preheating before welding up to 400 ° C on the properties of welds and its effect on the number of cracks in the surface layer. The use of preheating allowed to reduce the number of cracks in the surfacing to 1. The optimum heating temperature was 200 ° C, for which the number of cracks was reduced and the lowest wear was recorded.

Desirability-Based Performance Optimization of Wear-Resistant Coatings by HVOF Sprayed WC-Co Experiments

2011 ◽  
Vol 189-193 ◽  
pp. 3633-3639
Author(s):  
Ming Der Jean ◽  
Yih Hwang Yang ◽  
Tzu Hsuan Chien
Keyword(s):  
Wear Rate ◽  
Performance Optimization ◽  
Desirability Function ◽  
High Velocity Oxygen Fuel ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Designed Experiments ◽  
Control Factors ◽  
Desirability Analysis ◽  
Oxygen Fuel

This study presented the desirability function based on Taguchi designed experiments to solve multiple responses statistical optimal problems for the tungsten carbide/cobalt (WC-Co) coatings of high-velocity-oxygen-fuel (HVOF) processes. The eight control factors based on L18 arrays were conducted and the multi-responses of wear-resistant coatings such as hardness, deposited thickness and wear rate were evaluated simultaneously in the desirability-based experiments. Based on desirability analysis, the optimal settings have been identified, and the impacts of control factors are determined by analysis of variance on the multi-responses. Further, a confirmation run was conducted to validate the tests. Experimental results have shown that the hardness increased by 16.61% and the deposited thickness improved by 10.50%, while the wear rate decreased by 34.03%. It was clear that confirmation tests are greatly improved by way of the desirability-based multi-responses on HVOF WC-Co experiments, and these findings achieved the desired values on wear-resistant coatings. The proposed procedure was applied at HVOF sprayed WC-Co experiments, and the implementation results demonstrated its feasibility and effectiveness to maximize hardness, make a target of deposited thickness value and minimize wear rate by a HVOF.

Production of wear-resistant coatings on pump and fitting components by anodizing in a supercooled electrolyte

1990 ◽  
Vol 26 (9) ◽  
pp. 479-482
Author(s):  
E. E. Aver'yanov ◽  
R. M. Galimzyanov ◽  
K. Z. Gilyazova ◽  
V. A. Popov ◽  
A. V. Rabinovich ◽  
...  
Keyword(s):  
Wear Resistant ◽  
Wear Resistant Coatings
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