Abstract
Abstract The paper presents the properties of surface oxide layers with an increased content of carbon for tribological applications. The composite surface oxide layers were produced using a two-step technology through hard anodising of the surface of an aluminium alloy, followed by thermochemical treatment of anodic oxide coatings. The surface oxide layers were subjected to tribological tests in an oil-less sliding couple with T5W plastic. The presented test results confirm the usefulness of the proposed modifications of surface oxide layers for the purpose of enhancing the operational durability of oil-less sliding couples in a reciprocating motion.
Highlights
Among a number of materials applied in modern fields of technology, aluminium alloys are more and more frequently used as engineering materials
Surface oxide layers were produced using a two-step technology through hard anodising of the aluminium alloy surface followed by thermo-chemical treatment of the surface oxide layers
This paper presents the operational tests of oil-less pneumatic servo-motors, whose cylinder bearing surfaces were covered with modified surface oxide layers
Summary
Among a number of materials applied in modern fields of technology, aluminium alloys are more and more frequently used as engineering materials. With a thickness from several to a dozen or so micrometers, are characterised by much higher hardness compared to the input material Owing to such modification, aluminium alloys gain another quality advantageous for engineering materials, namely abrasion resistance (Brace and Sheasby, 1979; Gabe, 2002). The authors of the paper developed new technologies of low-temperature modification of surface oxide layers, whose essence consists in obtaining an increased carbon content in the close-to-surface zone of the coating, thereby leading to a reduction of the friction force in sliding couples with polymers in friction in air (Bara and Skoneczny, 2008; Kmita et al, 2008). This paper presents the operational tests of oil-less pneumatic servo-motors, whose cylinder bearing surfaces were covered with modified surface oxide layers
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