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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2009

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Surface modification of aluminium - lithium alloy using prenitriding option and SixNy coating deposition

Kaczmarek Ł., Sawicki J., Kyzioł K., Siniarski D., Jonas S., Stegliński M., Kołodziejczyk Ł., Tkacz-Śmiech K.

Journal of Achievements in Materials and Manufacturing Engineering

2009

Vol. 37, nr 2

282-285

Purpose: EU directive of CO2 emission reduction causes many applied technologies to become unprofitable considering environmental protection. Due to that, there is an urgent need to create new or modify existing technological solutions - especially in the field of materials engineering. One of the options to reduce CO2 emission is replacement of parts made of steel by Aluminum -Lithium alloys mainly in such branches like automotive and aircraft industry. Design/methodology/approach: Prenitriding option was carried out in low pressure plasma discharge mode, at a substrate temperature below 200şC followed by the deposition of 500 nm thick SixNy coating. Morphology and mechanical properties were compared with substrate without prenitriding treatment. Findings: In this paper, first promising results of surface treatment with the use of prenitriding option of Al-Li alloy are presented. The results showed that the wear resistance of the Al-Li alloy may be modified by application of plasma enhanced CVD [1-4]. Two different types of surface modification were applied. Research limitations/implications: In case of vehicles’ parts, subjected to wear or/and contact fatigue a use of light weight alloys gives rise to many difficulties, caused by their low surface parameters. The aluminium alloys applied for elements operated in wear contact even with the best possible mechanical properties at the moment, it is limited due to still not enough tribological properties. The research in this field may bring another reduction of vehicles total weight. Practical implications: At present, ultra light materials with high durability are elaborated for components, e.g. in automotive industry mainly to realize a light gearbox. Originality/value: Functional Gradient Coatings (FGC) was deposited below temperature which could cause destruction of “tailored” structure of the substrate.