WEAR-RESISTANCE OF CARBIDE-CONTAINING CHROME COATINGS OBTAINED FROM GAS PHASE

2017 ◽  
pp. 48-53
Author(s):  
M.N. Erokhin ◽  
◽  
S.P. Kazantsev ◽  
N.N. Chupyatov ◽  
◽  
...  
Keyword(s):  
Wear Resistance ◽  
Gas Phase

Functional gradient coatings obtained by supersonic cold gas dynamic spraying

2019 ◽  
pp. 74-78
Author(s):  
T. I. Bobkova ◽  
A. F. Vasiliev ◽  
I. S. Prudnikov ◽  
B. V. Farmakovsky
Keyword(s):  
Wear Resistance ◽  
Gas Phase ◽  
Cold Gas Dynamic Spraying ◽  
Wear Resistant ◽  
Functional Gradient ◽  
Traditional Technology ◽  
Gas Dynamic ◽  
High Microhardness ◽  
Gradient Coatings ◽  
Cold Gas

The paper studies the development of a technology for obtaining a wear-resistant functional gradient coating during supersonic cold gas dynamic spraying. The process goes due to the variation of the composition of the gas phase in a heterophase flow. The coating has a high microhardness (up to 12 GPa) on the peripheral layers and wear resistance is 3 times higher than that of coatings obtained by traditional technology.

scholarly journals Wear-resisting properties of multilayer coated carbide blades under different technological conditions of turning of heat-resistant steel

2018 ◽  
Vol 224 ◽  
pp. 01110 ◽  
Author(s):  
Vyacheslav Pchelkin ◽  
Tatyana Duyun
Keyword(s):  
Wear Resistance ◽  
Gas Phase ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Corrosion Resistant ◽  
Heat Resistant ◽  
Coated Carbide ◽  
Wear Resistance Coatings

Experimented results of wear-resisting properties of carbide blades with multilayer wear-resistance coatings, obtained by different processes: chemical vapor deposition and spraying by condensation from vapour (gas) phase while turning of corrosion –resistant heat-resistant steel 08Х18Н10Т are presented.

Co–Cr–Mo alloys: Improved wear resistance through low-temperature gas-phase nitro-carburization

2019 ◽  
Vol 378 ◽  
pp. 124943 ◽  
Author(s):  
Zhe Ren ◽  
Steven Eppell ◽  
Sunniva Collins ◽  
Frank Ernst
Keyword(s):  
Wear Resistance ◽  
Low Temperature ◽  
Gas Phase

Effect of combination of gas phase deposition and electric-spark alloying on wear resistance of VK8 (WC-8% Co) hard alloy

2006 ◽  
Vol 45 (7-8) ◽  
pp. 337-341 ◽  
Author(s):  
O. V. Stepanova ◽  
I. A. Podchernyaeva ◽  
I. I. Timofeeva ◽  
A. A. Rogozinskaya ◽  
V. P. Smirnov ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Hard Alloy ◽  
Gas Phase ◽  
Gas Phase Deposition

scholarly journals SURFACE HARDENING OF CONSTRUCTION MATERIALS WITH THE USE OF COMPOSITE SATURATING CHARGES

2020 ◽  
pp. 114-120
Author(s):  
Середа Б.П. ◽  
Кругляк І.В.
Keyword(s):  
Wear Resistance ◽  
Gas Phase ◽  
Sliding Friction ◽  
Construction Materials ◽  
Physical And Mechanical Properties ◽  
Structural Materials ◽  
Gaseous Products ◽  
Diffusion Coatings ◽  
Diffusion Layers ◽  
The Relationship

The article discusses the formation of the structure of protective diffusion layers using composite saturating charges on structural materials with different carbon content. A thermodynamic analysis of the gas phase at saturation has been carried out. The composition of the gas phase has been determined. Gaseous products interact with elements of the powder system (Al, Mo, Cr) and are transformed into the gas phase (CrH, CrOH, CrСl, CrСl2, CrСl3, СrОН, СrОСl2, CrI, CrI2, CrI3, МоСl, МоСl2, МоСl3, МоСl4, МоОСl, МоОСl2, МоI, МоI2, МоI3, МоI4). Using 3D modeling of microstructures, it was possible to more fully establish the nature of the distribution of phases and inclusions in the diffusion layer. The relationship between the 3D microstructure of the material and its physical and mechanical properties made it possible to carry out modeling to obtain the optimal composition of the developed composite charge for saturation. Diffuse layers are formed on the surface of structural materials, which contain Mo2C and α phases - the Cr, Al, Mo phase, the inclusion of Fе7Мо6, (Fe, Сr, Al, Mo)23С6. Carbides of three types were found: hexagonal chromium carbide Сr7C3 and carbides Мо2С, Cr23C, Fe3Mo3C и Fe2Mo2C. The physical, mechanical and operational properties of structural materials with protective diffusion coatings have been investigated. At tests in the conditions of sliding friction the best wear resistance among the considered diffusion coverings has vanadium, titanium and borized. Their wear resistance is 1.8 - 2.3 times greater than that of coatings obtained under isothermal conditions.

scholarly journals Formation of wear resistant coatings on aluminum alloys by chromium deposition from gas-phase organometallic compounds

2016 ◽  
Vol 1 (2) ◽  
pp. 34-38 ◽  
Author(s):  
В Александров ◽  
V Aleksandrov ◽  
М. Морщилов ◽  
M. Morshchilov
Keyword(s):  
Wear Resistance ◽  
Substrate Temperature ◽  
Gas Phase ◽  
Chemical Vapor ◽  
High Hardness ◽  
Organometallic Compounds ◽  
Deposition Process ◽  
Amorphous Structure ◽  
Decomposition Temperature ◽  
Evaporator Temperature

The method of coatings producing by chemical vapor deposition from gas phase by pyrolysis of organometallic com-pounds of chromium on the aluminum alloy AL9 is described. For the research the “Barhos” liquid with bis-arene chromium organic compounds, containing bis-ethylbenzene chromium (322 ºC boiling point, decomposition temperature of the metal is 330 ºC), was selected. The chromium content in the liquid is not less than 16%.The deposition process depends on the gas-phase chromium: substrate temperature, reactor pressure, evaporator temperature, process duration. The deposition temperature (substrate temperature) is one of the major factors in the formation of coatings. It is determined, that the pyrolytic chromium coatings are characterized by high hardness (up to 16000 MPa) and wear resistance due to the amorphous structure, which allows them to improve the wear resistance of rubbing parts.

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

Residual Gas Reactions in the Electron Microscope: I. Qualitative Observations on the Water Gas Reaction

1968 ◽  
Vol 26 ◽  
pp. 292-293
Author(s):  
Richard E. Hartman ◽  
Roberta S. Hartman ◽  
Peter L. Ramos
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Gas Phase ◽  
Absolute Temperature ◽  
Residual Gas ◽  
Gas Reactions ◽  
Image Position ◽  
The Right ◽  
Water Gas ◽  
Thinning Rate

The action of water and the electron beam on organic specimens in the electron microscope results in the removal of oxidizable material (primarily hydrogen and carbon) by reactions similar to the water gas reaction .which has the form:The energy required to force the reaction to the right is supplied by the interaction of the electron beam with the specimen.The mass of water striking the specimen is given by:where u = gH2O/cm2 sec, PH2O = partial pressure of water in Torr, & T = absolute temperature of the gas phase. If it is assumed that mass is removed from the specimen by a reaction approximated by (1) and that the specimen is uniformly thinned by the reaction, then the thinning rate in A/ min iswhere x = thickness of the specimen in A, t = time in minutes, & E = efficiency (the fraction of the water striking the specimen which reacts with it).

Integration of Core-Edge Spectroscopy Methods for the Study of Polymers

1996 ◽  
Vol 54 ◽  
pp. 154-155
Author(s):  
E. G. Rightor
Keyword(s):  
Excited State ◽  
Polymer Blends ◽  
Gas Phase ◽  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Electronic States ◽  
Core Electron ◽  
Bulk Solids ◽  
Development Application

Core edge spectroscopy methods are versatile tools for investigating a wide variety of materials. They can be used to probe the electronic states of materials in bulk solids, on surfaces, or in the gas phase. This family of methods involves promoting an inner shell (core) electron to an excited state and recording either the primary excitation or secondary decay of the excited state. The techniques are complimentary and have different strengths and limitations for studying challenging aspects of materials. The need to identify components in polymers or polymer blends at high spatial resolution has driven development, application, and integration of results from several of these methods.

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