Effect of Burnishing on the Contact Fatigue of Regenerative Thermally Sprayed Coatings

Starosta, Robert

doi:10.5604/12314005.1136189

Cited by 4 publications

(2 citation statements)

References 3 publications

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“…For thermal spray of coatings Casto-Dyn DS 8000 torch was used. The following process parameters [4,13]: − pressure of acetylene: 0.07 MPa, − pressure of oxygen: 0.4 MPa, − pressure of air: 0.1 MPa, − spraying distance: 150 mm, − substrate temperature: 50-80°C. The average coating thickness was 0.2 mm.…”

Section: Testing Methodsmentioning

confidence: 99%

The Study of Linear Correlation Between Surface Roughness Parameters and Adhesion of Flame Sprayed Coatings

Mikuliszyn

Starosta

2016

Journal of KONES. Powertrain and Transport

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Adhesion is one of the reasons for limiting the use of thermally sprayed coatings. Many factors influence the adhesion of thermally sprayed coatings, for example: quality of the workmanship of surface preparation, method of thermal spraying, processing parameters, and the temperature of the preliminary preheat substrate, properties of the substrate and coating materials. Another one is the surface roughness. Attempts are made to use surface roughness parameters (e.g. Ra, Rz, Rq, Rku, Rsk) for prediction of adhesion of thermally sprayed coatings. However, most often these attempts end in failure. This article discusses the task of assessing the linear correlation between the twelve parameters of roughness or material ratio of various surface profiles and strength bond of coatings. For analysis, the following parameters were selected: Rz, Ra, Rq, Rsk, Rt, RSm, Rp, Rv, Rku, Rmr (50%), Rk, Rpk, Rvk. The steel substrates (S185) were machined by abrasive machining. The surface roughness of the steel substrate ranged Rz = 1.89-5.34 mm. Nickel-based coatings were applied by flame spraying by the Casto Dyn DS 8000 torch. Adhesion of coatings was measured by pull -off method. The flame sprayed coatings were characterized by adhesion to the steel substrate in the range of from 5.53 MPa to 8.28 MPa. The highest value of the correlation coefficient (Pearson -R) between parameters Rp, Rpk, and adhesion of thermally sprayed coatings were found. The coefficient R was equal to the 0.83, and the coefficient of determination R 2 = 0.7. The lowest value of the correlation coefficient was found for the Rku roughness parameter amounting to 0.37. In the measurements carried out, it can be concluded that the prediction of adhesion of the coatings according to the roughness of the substrate, should be carried out by use the parameters characterizing the peaks height of roughness profile.

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Section: Testing Methodsmentioning

confidence: 99%

The Study of Linear Correlation Between Surface Roughness Parameters and Adhesion of Flame Sprayed Coatings

Mikuliszyn

Starosta

2016

Journal of KONES. Powertrain and Transport

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“…As a result of the particles collision with the substrate follows it connection with the substrate. This method is the only one that allows makes coating by using the particles, which remain solid during the process [1,5].…”

Section: Introductionmentioning

confidence: 99%

Influence of Parameters of Grit Blasting Conducted Dymet® Device 412k to Obtain Roughness

Szyfelbain¹,

Charchalis²,

Starosta³

2016

Journal of KONES. Powertrain and Transport

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There are several fundamental steps for the technological preparation, which are required to optimize the thermal spray coatings. In order to ensure proper bonding of the coating, important is properly preparation of substrate. The surface of the substrate has to be clean and should have a suitable roughness after previously performed treatment. Knowledge about the effects of process parameters allows designing the coatings obtained with an optimal adherence. Only when all the components of the spraying coating process are used correctly there is possible properly design the technology. The article describes the impact of technological parameters of grit blasting to obtain the roughness of the steel substrate (steel S185) to the process of metallic coatings by cold gas dynamic spraying. Research was carried out by using the Dymet ® 412K appliance, designed for applying metal coatings and substrate surface cleaning. Grit blasting is a mechanical method of surface preparation of metal parts. It allows obtaining a high degree of surface cleanliness and a determined roughness. The authors took into account parameters such as operational pressure, spray angle (incidence) of abrasive grit blasting in the axis of the stream and feed rate of used abrasive particles (Al2O3) passed to the nozzle of spray gun. Carried out the multiple regression analysis of the roughness parameters results. It revealed the existence of certain influences and changes of process parameters, which affect on the surface quality. Carried out calculations by using a multiple regression showed that the greatest correlation is between the required roughness and the feed rate of used abrasive particles. The studied roughness was described by the parameters: Ra, Rz, Rt and RSm. Stepped growth (from 0.1 to 0.8 g/s) of abrasive particles feed rate caused a decline of all of the roughness parameters. It has been found that the values of the roughness in the least depend on the operational pressure.

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Analytical contact pressure model for predicting roughness of ball burnished surfaces

Hiegemann

Weddeling

Tekkaya

2016

Journal of Materials Processing Technology

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Effect of Burnishing on the Contact Fatigue of Regenerative Thermally Sprayed Coatings

Cited by 4 publications

References 3 publications

The Study of Linear Correlation Between Surface Roughness Parameters and Adhesion of Flame Sprayed Coatings

The Study of Linear Correlation Between Surface Roughness Parameters and Adhesion of Flame Sprayed Coatings

Influence of Parameters of Grit Blasting Conducted Dymet® Device 412k to Obtain Roughness

Analytical contact pressure model for predicting roughness of ball burnished surfaces

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