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1 International Journal of Applied Mechanics and Engineering

1 2003

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A friction model of microbearings with thin metallic compliant coatings

Stiharu I., Bhat R., Hong H.

International Journal of Applied Mechanics and Engineering

2003

Vol. 8, no 2

317-329

The paper presents experimental results of the investigation on the micro-tribological properties of Ti thin film layers deposited on metallic substrates of various hardness. The tests were carried out under standard dry friction conditions using a miniature pin on disk apparatus. The experimental results found for the friction coefficient developed between 52100 steel pin and Ti as a compliant layer deposited on various hardness substrates from soft to hard are consistent with other results presented in literature for the pair steel/Ti. A friction model that assumes the plowing of microasperities into the soft thin film layer supported by the elastic substrate as the main factor in the originating friction is further proposed. A simplified one-asperity model is assessed against the compliant layer assumed deposited on a rigid substrate. The analysis of the influence of the stress developed at the interface substrate-film is assumed in this model. Tests carried out qualitatively confirmed that the influence of the inter-laminar stress is significant to friction. Given the simplification assumptions, the proposed model exhibits reasonable agreement with the experimental results. It is further suggested that the lubrication of the hard surfaces with thin compliant metallic layers of Ti represents an alternative for the friction improvement in the small bearings belonging to miniature mechanical systems and the Micro-Electro-Mechanical Systems (MEMS).