Al2O3/WS2 Surface Layers Produced on the Basis of Aluminum Alloys for Applications in Oil-Free Kinematic Systems

Korzekwa, Joanna; Bara, Marek; Kaptacz, Sławomir

doi:10.3390/ma14247738

Cited by 6 publications

(3 citation statements)

References 30 publications

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“…Oxide coatings produced by hard anodizing have additionally increased hardness, thanks to which they can be used for sliding connections in piston-cylinder systems [22,23]. One example of using this combination is oil-free pneumatic actuators and compressors [24,25]. The cylinders of actuators and compressors are made of aluminum alloys, internally hardened by hard anodizing, and the piston seals are polymer rings.…”

Section: Introductionmentioning

confidence: 99%

Influence of Research Factors and Al2O3 Layer Production Parameters on Tribological and Microstructural Properties

Korzekwa,

Matczuk,

Hubkiewicz

et al. 2023

Lubricants

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The exclusion of systems supplying the lubricant from the outside makes it necessary to replace traditional sliding pairs with materials containing a lubricant component. Such solutions are carried out to prevent the formation of material tacks and, consequently, of adhesive wear, which must be avoided. The article presents the influence of research factors and parameters of Al2O3 layer production on tribological and microstructural properties. The input variables for the tests were the admixture of WS2 to the electrolyte, the type of sputtering of the samples for SEM tests, and the load on the oxide coating—TG15 material friction node. The surface morphology and cross-section of the oxide coatings as well as the tribological properties of the rubbing pair have been studied. Interactions between the input variables and the obtained test results have been analyzed using DOE—a 2k factorial design with one repetition. Pareto charts and two-way ANOVA were used to determine the relationship. The analysis of variance shows the influence of sample preparation on the calculation values of the size of nanopores and Al2O3 walls on the SEM image. Statistical analyzes also show that both the load and the type of electrolyte affected the values of the coefficient of friction and wear of the TG15 material; those values are the result of appropriate adhesion of the sliding film to the surface of the layer.

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Section: Introductionmentioning

confidence: 99%

Influence of Research Factors and Al2O3 Layer Production Parameters on Tribological and Microstructural Properties

Korzekwa,

Matczuk,

Hubkiewicz

et al. 2023

Lubricants

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“…Currently, the materials containing PTFE (polytetrafluoroethylene), which are characterized by a very low coefficient of friction, have the greatest application in the sliding elements of industrial devices and machines. Examples include T5W and T7W [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Anodizing Parameters on Tribological Properties and Wettability of Al2O3 Layers Produced on the EN AW-5251 Aluminum Alloy

et al. 2022

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The article presents the effect of anodizing parameters of the EN AW-5251 aluminum alloy on the thickness and roughness of Al2O3 layers as well as their wettability and tribological properties in a sliding combination with the T7W material. The input variables were the current density of 1, 2, 3 A/dm2 and the electrolyte temperature of 283, 293, 303 K. The tribological tests were performed on the T-17 tester in reciprocating motion, in conditions of technically dry friction. The tests were carried out on a 15 km road with a constant average slip speed of 0.2 m/s and a constant unit pressure of 1 MPa. The measurement of the wettability of the layers was performed using the sitting drop method, determining the contact angles on the basis of which the surface free energy was calculated. The profilographometric measurements were made. The analysis of the test results showed that the anodizing parameters significantly affect the thickness of the Al2O3 layers. The performed correlation analysis also showed a significant relationship between the roughness parameters and the wettability of the surface of the layers, which affects the ability to create and maintain a sliding film, which in turn translates into sliding resistance and wear of the T7W material. The analysis of friction and wear tests showed that the layer with hydrophobic properties produced at a current density of 1 A/dm2 in an electrolyte at a temperature of 283 K is the most favorable for sliding associations with T7W material.

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“…The analysis of the literature shows that the vast majority of scientific research for various applications concerns oxide layers produced under a constant electric charge [ 20 , 21 , 22 , 23 ]. There were no publications concerning the influence of anodizing parameters (electrolyte temperature, current density) on their properties as a result of constant-time anodizing, which was the aim of the presented research.…”

Section: Introductionmentioning

confidence: 99%

Dependence of the Surface Morphology and Micromechanical and Sclerometric Properties of Al2O3 Layers on the Parameters of Anodizing Aluminum Alloy

2022

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The article presents the dependence of the morphology as well as micromechanical and sclerometric properties of Al2O3 layers on the parameters of anodizing of aluminum alloys. The oxide layers were produced on the EN AW-5251 aluminum alloy by means of a direct current anodizing in a three-component electrolyte. The input variables (current density and electrolyte temperature) were selected based on the overall design of the experiment. The current density was 1, 2, 3 A/dm2, and the electrolyte temperature was 283, 293, 303 K. The surface morphology was examined using a scanning electron microscope (SEM), and then the microscopic images were analyzed using a graphics program. The micromechanical and sclerometric properties were examined by determining the HIT hardness and three critical loads: Lc1 (critical load at which the first damage of the tested layers occurred-Hertz tensile cracks inside the crack), Lc2 (critical load at which the first cohesive damage of the layers occurred) and Lc3 (load at which the layers were completely damaged). Sclerometric tests with the use of scratch tests were supplemented with pictures from a scanning microscope, showing the scratches. The produced layers are characterized by a hardness above 3 GPa and a porosity of 4.9–10.3%. Such a range of porosity of the produced layers allows their wide application, both for sliding associations with polymers and for their modification.

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Al2O3/WS2 Surface Layers Produced on the Basis of Aluminum Alloys for Applications in Oil-Free Kinematic Systems

Cited by 6 publications

References 30 publications

Influence of Research Factors and Al2O3 Layer Production Parameters on Tribological and Microstructural Properties

Influence of Research Factors and Al2O3 Layer Production Parameters on Tribological and Microstructural Properties

Influence of Anodizing Parameters on Tribological Properties and Wettability of Al2O3 Layers Produced on the EN AW-5251 Aluminum Alloy

Dependence of the Surface Morphology and Micromechanical and Sclerometric Properties of Al2O3 Layers on the Parameters of Anodizing Aluminum Alloy

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