Elemental Distribution of Gas-Thermal Coatings with W and Ta Modifiers

2020 ◽  
Vol 992 ◽  
pp. 627-632
Author(s):  
Dmitry I. Lebedev
Keyword(s):  
Gas Flow ◽  
Electric Arc ◽  
Arc Spraying ◽  
Elemental Distribution ◽  
Machined Surface ◽  
Cored Wire ◽  
Subsequent Formation ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Distribution Composition

Currently, the technology of arc metallization according to technical and economic indicators is a promising way to restore worn parts of equipment. In the coating process the cored wire is melted by an electric arc, and molten particles are accelerated towards the surface parts with high temperature gas flow. On the subsequent formation of strengthening coatings are significantly influenced the technological modes of electric arc metallization. As practice shows, the coatings obtained by electric arc metallization are characterized by a heterogeneous layered structure. The structure of powder coatings, the distribution, composition and properties of the phases affect on the wear resistance, hardness and strength of the machined surface of machine parts and mechanisms. It is therefore necessary a detailed study of the structure of wear-resistant coatings taking into account technological properties of cored wire, and process heating of the particles by arc spraying. In this work the X-ray microanalysis of the elements of the structure of wear-resistant coatings obtained from cored wire with a refractory additives were conducted. The results of the study will be useful for the improvement technology of electric-arc metallization cored wires.

Improving the efficiency of hardening of tillage machine working bodies by arc surfacing using wear-resistant rollers

2020 ◽  
pp. 176-185
Author(s):  
Dmitriy B. Slinko ◽  
Vyacheslav A. Denisov ◽  
Dmitriy A. Dobrin ◽  
Andrey V. Afanas’yev ◽  
Pavel M. Kislov
Keyword(s):  
Wear Resistance ◽  
Operating Time ◽  
Field Tests ◽  
Electric Arc ◽  
Cutting Edge ◽  
Linear Size ◽  
Research Purpose ◽  
Cored Wire ◽  
Wear Resistant ◽  
Working Bodies

Reducing operating costs during soil processing and increasing the wear resistance of parts and components is an important condition for reducing the cost of agricultural products, increasing its efficiency and competitiveness. The development of materials with increased wear resistance and new effective technologies for strengthening working bodies in their manufacture is now becoming an urgent task. (Research purpose) The research purpose is increasing the wear resistance of the working bodies of soil-processing machines by electric arc surfacing. (Materials and methods) During the experimental study, it has been performed testing of modes and surfacing of a pilot batch of working bodies from Kverneland for field tests in VIM on an automated installation for electric arc surfacing. Authors used eutectic CastolinEnDotec DO*30 powder wire with a diameter of 1.2 millimeters and a boron content of up to 4 percent for surfacing wear-resistant rollers, which allows to obtain wear-resistant rollers with a hardness of up to 65 HRC without pores and cracks. (Results and discussion) It has been revealed that hardened ploughshares that have passed field tests are subject to lower wear rates compared to non-hardened ones. It was found that when operating time is 24.785 hectares per ploughshare, the wear of the linear size of the cutting edge along the width of hardened ploughshares is on average up to 10-11 millimeters less than that of non-hardened ones. It was found that when processing 228 hectares, the wear of the linear size of the cutting edge along the width of hardened bits is on average up to 9-10 millimeters less than that of non-hardened ones. (Conclusions) The technology of surfacing with intermittent wear-resistant rollers provides an increase in the efficiency of hardening of Kverneland working bodies according to the criterion of wear resistance by an average of 20-30 percent. The adjusted technological parameters of the surfacing process will reduce the wear rate and increase the service life of the blade part of the working bodies, as well as reduce the amount of surfaced material by an average of 60 percent. The continuation of work on strengthening the working bodies should be aimed at changing the surfacing scheme and choosing a cheaper domestic cored wire.

Nanostructural wear-resistant coatings produced on metal-cutting tools by electric-arc evaporation and magnetronic sputtering

2010 ◽  
Vol 30 (9) ◽  
pp. 910-920 ◽  
Author(s):  
F. V. Kiryukhantsev-Korneev ◽  
N. A. Shirmanov ◽  
A. N. Sheveiko ◽  
E. A. Levashov ◽  
M. I. Petrzhik ◽  
...  
Keyword(s):  
Metal Cutting ◽  
Cutting Tools ◽  
Electric Arc ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Arc Evaporation

A Study on the Arc Spraying of 7Cr13 Cored Wire and Tribological Properties of the Composite Coating

1998 ◽  
Author(s):  
B. Xu ◽  
S. Ma ◽  
J. Wang ◽  
J. Tan
Keyword(s):  
Bond Strength ◽  
Composite Coating ◽  
Tribological Properties ◽  
High Hardness ◽  
Wear Resistant Coating ◽  
Arc Spraying ◽  
Metallurgical Process ◽  
Cored Wire ◽  
Wear Resistant ◽  
Wire Arc Spraying

Abstract For the purpose of getting high hardness and high wear-resistant coating by arc spraying technology, the arc spraying of 7Cr13 cored wire is adopted in this paper. The metallurgical process of the cored wire arc spraying is discussed. The bond strength, hardness and tribological properties of the composite coating are investigated.

scholarly journals Theoretical background for the creation of wear-resistant coatings at the carbo-vibro-arc hardening

2021 ◽  
Vol 341 ◽  
pp. 00032
Author(s):  
Aleksandr Kolomeichenko ◽  
Nikolay Titov ◽  
Aleksеy Kolomeichenko
Keyword(s):  
Electric Field ◽  
Hardened Layer ◽  
Theoretical Background ◽  
Electric Arc ◽  
Theoretical Studies ◽  
Carbon Electrode ◽  
Metal Coatings ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Machine Parts

The paper presents the results of theoretical studies that allow predicting the formation of wear-resistant coatings on the working surfaces of machine parts by the method of carbo-vibro-arc hardening (CVAH). Analytical regularities of electric field intensity formation by oscillating carbon electrode during carbo-vibro-arc hardening (CVAH) have been established; the maximum layer thickness of multicomponent paste, 2.1...2.5 mm, which ensures stable electric arc combustion during CVAH, has been theoretically substantiated. With the increase of amplitude and frequency of oscillations of the carbon electrode, the electric field strength at CVAH decreases nonlinearly, but the thickness of the hardened layer of the multicomponent paste has the greatest influence on it. As a result, ceramic-metal coatings of high quality and integrity are formed on the hardened surfaces of parts. The testing of the obtained theoretical regularities has confirmed their reliability.

scholarly journals Structure and Properties of the Wear-Resistant Coatings Fused on Steel with Flux Cored Wires by an Electric Arc Method

2014 ◽  
Vol 15 (4) ◽  
pp. 213-234 ◽  
Author(s):  
V. E. Gromov ◽  
E. V. Kapralov ◽  
S. V. Raikov ◽  
Yu. F. Ivanov ◽  
E. A. Budovskikh
Keyword(s):  
Electric Arc ◽  
Structure And Properties ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Cored Wires

Processing and Characterization of Multi-Layered Wear-Resistant Ceramic Coatings

1990 ◽  
Vol 112 (2) ◽  
pp. 164-174 ◽  
Author(s):  
A. K. Murthy ◽  
K. Komvopoulos ◽  
S. D. Brown
Keyword(s):  
Cast Iron ◽  
Gas Flow ◽  
Enamel Coating ◽  
Interfacial Strength ◽  
Surface Damage ◽  
Ceramic Coatings ◽  
Glass Frit ◽  
Main Process ◽  
Wear Resistant ◽  
Wear Resistant Coatings

A new concept of a multi-layered ceramic coating consisting of a porcelain enamel bond interlayer with thermal expansion characteristics tailored to match those of a cast iron substrate and a plasma-sprayed wear-resistant surface layer of chromium oxide, chromium carbide, or partially stabilized zirconia was investigated. Flat substrates of grit-blasted and surface-treated cast iron were slurry sprayed with a finely ground glass frit mixed with isopropyl alcohol and water. Subsequently, the specimens were dried in an oven before firing at 1023 K to produce a smooth, dense, and strongly adherent enamel coating 75 to 100 μm thick. Wear-resistant coatings of oxides and carbides with varying particle sizes and powder densities were then thermally sprayed, by means of a plasma spray gun, at controlled power ratings and gas flow rates. The produced ceramic coatings were subsequently ground to a thickness of about 120 μm. Adherence testing by the tensile pull-off technique revealed high interfacial strength between the enamel coating and the substrate resulting from enhanced chemical interdiffusion and mechanical interlocking. Unlubricated sliding wear experiments using a ball-on-flat tribotester and tungsten carbide balls as sliders demonstrated low initial and moderately high steady-state friction coefficients. Optical and scanning electron microscopy and surface profilometry of the tested ceramic-coated specimens verified that surface damage and wear rate were negligibly small. The important role of the main process parameters on the interfacial adherence and uniformity of the enamel and ceramic layers and the potentiality of the developed processes in the deposition of relatively low-friction and wear-resistant multi-layered thick ceramic coatings are discussed in the context of the obtained results.

Powder wires for resource-saving electric arc spraying

2021 ◽  
pp. 11-17
Author(s):  
V. P. Murzaev ◽  
D. B. Slinko ◽  
Yu. N. Shchetinin
Keyword(s):  
Electrode Materials ◽  
Thermal Spraying ◽  
Machine Building ◽  
Electric Arc ◽  
Arc Spraying ◽  
Resource Saving ◽  
Metal Structures ◽  
Wear Resistant Coatings ◽  
Heat Resistant ◽  
The Cost

One of the promising methods of thermal spraying is the arc spraying. The use of electric arc spraying is particularly eff ective for the protection of metal structures from corrosion, receiving heat resistant, heat-resistant and wear-resistant coatings. This method is also eff ective in the recovery and hardening de tackles tractors, trucks and agricultural machinery. Signifi cantly extend the scope of the arc deposition can be using the new electrode materials in the form of fl ux-cored wires, the cost of which can be reduced by using materials for dying as a band , with factories producing cable products and iron shavings tion of machine-building enterprises.

Experience in the Use of a Flux Cored Wire as a Filler Wire in the Deposition of Wear-Resistant Coatings

2021 ◽  
Vol 2021 (6) ◽  
pp. 746-750
Author(s):  
N. V. Kobernik ◽  
A. L. Galinovskii ◽  
A. S. Pankratov ◽  
V. V. Petrova ◽  
M. A. Aleksandrov
Keyword(s):  
Filler Wire ◽  
Cored Wire ◽  
Wear Resistant ◽  
Wear Resistant Coatings
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