scholarly journals Assessment of tribotechnical properties and resistance to wear of plasma coatings

2021 ◽  
pp. 95-108
Author(s):  
Alexandr O. Tokarev ◽  
Lyubov D. Makagon Makagon
Keyword(s):  
Sliding Friction ◽  
Contact Fatigue ◽  
Fatigue Tests ◽  
Operating Conditions ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Operational Tests ◽  
Cavitation Wear ◽  
Cyclic Impact ◽  
Plasma Technologies

In order to determine the operating conditions of parts for which restoration of worn surfaces is acceptable by the method of plasma spraying of various powder alloys, contact fatigue tests were carried out under cyclic contact impulse loading. In addition, tribotechnical tests were carried out with various wear-resistant coatings under conditions of liquid sliding friction. Bench and operational tests showed the use of coatings obtained using modern plasma technologies, the feasibility of protecting parts operating in conditions of corrosion, waterjet and cavitation wear, as well as in sliding friction. The coating sprayed with Ni-Al intermetallic alloy powder provides the most reliable protection against shock cyclic impact and abrasion during liquid friction than other materials studied. Coating with wear-resistant self-fluxing powder Ni-Cr-B-Si-C alloy, hardened by solid carboboride phases, without its additional heat treatment for restoration of surfaces working in sliding friction pairs, is not recommended.

Investigation of the formation of friction surface microgeometry of a wear-resistant coating during friction with a metal counterbody

2021 ◽  
pp. 147-152
Author(s):  
N.F. Struchkov ◽  
G.G. Vinokurov ◽  
O.N. Popov
Keyword(s):  
Statistical Model ◽  
Binomial Distribution ◽  
Friction Surface ◽  
Sliding Friction ◽  
Wear Particles ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Frictional Interaction ◽  
Surface Microgeometry ◽  
Friction Surfaces

Were is researched the friction surfaces of wear-resistant coatings with modifying additives Al2O3 and metal counterbody made of ShH15 steel, and also reveals the factors that influence the formation of coating microgeometry of surface during sliding friction. A statistical model has been developed based on the binomial distribution of removed wear particles to describe the frictional interaction during friction of the coating with a metal counterbody.

New Methodology to Evaluate the Rolling Contact Fatigue Performance of Bearing Steels With Surface Dents: Application to 32CrMoV13 (Nitrided) and M50 Steels

2005 ◽  
Vol 127 (3) ◽  
pp. 611-622 ◽  
Author(s):  
D. Nélias ◽  
C. Jacq ◽  
G. Lormand ◽  
G. Dudragne ◽  
A. Vincent
Keyword(s):  
Normal Load ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Fatigue Tests ◽  
Operating Conditions ◽  
Rolling Contact ◽  
Experimental Result ◽  
Damage Initiation ◽  
Bearing Steels ◽  
Improved Performance

A new methodology is proposed to evaluate the rolling contact fatigue (RCF) performance of bearing steels in presence of surface dents. The experimental procedure consists of denting the raceway of test specimens with a hardness machine using spherical diamond tips of different radii (i.e., 200, 400, and 600μm) and with an applied normal load ranging from 5to50daN. Analysis of various dent geometries yield an analytical law with five parameters useful for fitting experimental profiles for contact simulation. Fatigue tests are conducted using a two-disk machine to study the effect of different operating conditions on RCF and to compare the performances of nitrided 32CrMoV13 steel versus M50 reference steel. A numerical investigation is conducted to analyze experimental result. Initially, the local residual stresses and plastic strains around the dent are obtained through finite element simulations of the indentation process. Second, the overrolling of the dent is simulated with a contact code. Finally, an indent-based endurance limit, called H1I, is proposed and comparisons are made with test results. Both RCF tests and numerical simulations show improved performance with nitrided 32CrMoV13 steel when compared to the M50 reference steel. The dominating role of sliding is also experimentally highlighted and two areas of damage initiation are identified. The effects of normal load and hoop stress are less marked.

Chemical Effects of Lubrication in Contact Fatigue—Part III: Load-Life Exponent, Life Scatter, and Overall Analysis

1976 ◽  
Vol 98 (2) ◽  
pp. 308-315 ◽  
Author(s):  
W. E. Littmann ◽  
B. W. Kelley ◽  
W. J. Anderson ◽  
R. S. Fein ◽  
E. E. Klaus ◽  
...  
Keyword(s):  
Relevant Literature ◽  
Contact Fatigue ◽  
Fatigue Tests ◽  
Operating Conditions ◽  
Zinc Dialkyldithiophosphate ◽  
Additive Package ◽  
Chemical Effects ◽  
Contact Fatigue Life ◽  
Program Show ◽  
Selection Of

A brief review of relevant literature is presented with the logic underlying the selection of lubricant base stocks, additives, materials, surface textures, and other variables used in contact fatigue tests under rolling-sliding conditions. Tests of selected combinations (mineral oil with and without a zinc dialkyldithiophosphate additive and a polyolester synthetic with and without its typical additive package) showed that lubricant chemistry affects the stress/life slope and the Weibull slope (scatter in life). Results of the overall program show that the relative contact fatigue life for different lubricant chemistries should be evaluated using operating conditions, especially stress and slip levels, near to expected application conditions.

Multifunctional Wear Resistant Coatings for Sliding Friction Pairs

2020 ◽  
Vol 55 (9-10) ◽  
pp. 835-842
Author(s):  
Yu. А. Morgunov ◽  
B. P. Saushkin ◽  
N. V. Khomyakova
Keyword(s):  
Sliding Friction ◽  
Wear Resistant ◽  
Wear Resistant Coatings

scholarly journals INVESTIGATION ON WEAR-RESISTANT COATINGS FROM DIFFUSION-ALLOYED AUSTENITIC STEEL OBTAINED BY PLASMA SPRAYING AND SUBSEQUENT LASER PROCESSING

2017 ◽  
Vol 16 (3) ◽  
pp. 249-255
Author(s):  
O. G. Devoino ◽  
A. F. Panteleenko
Keyword(s):  
Austenitic Steel ◽  
Plasma Spraying ◽  
Laser Processing ◽  
Sliding Friction ◽  
Common Knowledge ◽  
Internal Stresses ◽  
Alloyed Powder ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Operational Characteristics

The paper describes investigations on wear-resistant coatings from diffusion-alloyed austenitic steel obtained while using plasma spraying and subsequent laser processing. It is common knowledge that majority of machine parts and equipment has been out of service due to wear of surface layer. Application of diffusion-alloyed powder ПР-Х18Н9 based on austenitic steel while using combined technology including plasma spraying and laser infusion makes it possible to obtain qualitative coatings with high operational characteristics. The coating has a homogeneous structure with characteristic dispersive finely-dendrite formation. While using various powder boronizing modes and laser processing it is possible to control a porosity  (0,23–4,70 %) because the given factor is considered as an inherited parameter and it is influenced not only by laser processing characteristics but by powder boronizing time. It has been established that  the least deformations and internal stresses are formed in the coating in the case when self-fluxing diffusion-alloyed powder has been applied for 3 hours.  It has been revealed that there is a sharp increase in micro-hardness at the depth of 150-400 µm from the surface for a specific energy of 100-300 J/mm2 regardless of boronizing time. Coatings can be successfully applied in industry because after laser infusion the required mechanical processing of parts will not worsen operational characteristics when less hard coating layer is removed. Tests of parts under conditions of dry sliding friction without lubrication  have shown an increase of wear-resistance by 3.0-3.2-fold while preserving corrosion-resistance.

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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