A friction model of microbearings with thin metallic compliant coatings

• Autorzy: Stiharu I. , Bhat R. , Hong H.
• Języki publikacji: EN

Abstrakty

EN

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).

Słowa kluczowe

EN

micro-bearings; Ti thin film coatings; friction coefficient; experimental validation

PL

tribologia; współczynnik tarcia; łożysko

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2003
• Tom: Vol. 8, no 2
• Strony: 317--329
• Opis fizyczny: Bibliogr. 15 poz., rys., wykr.

Twórcy

autor

Stiharu I.

• Department of Mechanical Engineering, Concordia University 1455 de Maisonneuve Blvd. West, Montreal, H3G 1M8 Quebec, CANADA

autor

Bhat R.

• Department of Mechanical Engineering, Concordia University 1455 de Maisonneuve Blvd. West, Montreal, H3G 1M8 Quebec, CANADA

autor

Hong H.

• Department of Mechanical Engineering, Concordia University 1455 de Maisonneuve Blvd. West, Montreal, H3G 1M8 Quebec, CANADA

Bibliografia

• [1] Baker P. and Nix W.D. (1994): Mechanical properties of compositionally-modulated Au-Ni: Thinfilms nanoindentation and micro-cantilever beam deflection experiments. - Journal of Materials Research, vol.9, pp.3131-3144.
• [2] Berthier Y., Vincent L. and Godet M. (1992): Velocity accommodation sites and modes in tribology. - Eur. J. Mech. A/Solids, vol. 11, No.l, pp.35-47.
• [3] Bushan B. and Gupta B.K. (1991): Handbook of Tribology. - New York: McGraw Hill Inc.
• [4] Huston M.R., Howe R.T., Komvopoulos K. and Maboudian (1995): Diamond-like-carbon films for Silicon passivation in microelectro-mechanical devices. - Proc. of Materials Research Society Symposium, Spring Meeting, April 17-25, 1995, San Francisco, vol.383, pp.391-402.
• [5] Komvopoulos K. (1996): Surface engineering and microtribology for microelectromechanieal Systems. - Wear, vol.200, pp.305-327.
• [6] Komvopoulos K. (1989): Elastic-plastic finite element analysis of indented layered media. - ASME J. of Tribology, vol. l 11, pp.430-439.
• [7] Ludema K.C. (1996): Mechanisms-based modeling of friction and wear. - Wear, vol.200, pp.1-7.
• [8] Matthewson K.J. (1981): Axi-symmetric contact on thin compliant coatings. - J. Mech. Phys. Solids, vol.29, No.2, pp.89-113.
• [9] Reich R. and Snyder D. (1990): A comparative pin-on-disk wear study of monomeric and polymeric langmuir-blodget fdms on cadmium salt of 10, 12 tricosadiyonic acid. - Tribology Transactions, vol.33, No.3, pp.463-469.
• [10] Stiharu I., Demian T. and Bhat R. (1994): Mixed lubrication model for microbearings containing microasperities of defined geometry - Wear, vol.l72, pp.1-10.
• [11] Suzuki S., Matsuura T., Uchizawa M., Yura S. and Shibata H. (1991): Friction and wear studies on lubrication and materials applicable to MEMS. - Proceedings to MEMS, January 30 - February 2, 1991, Nara, Japan, pp.143-147.
• [12] Tian H., Saka N. and Suh N. (1989): Boundary lubrication studies on undulated titanium surfaces. - Tribology Transactions, vol.32, No.3, pp.289-296.
• [13] Varansasi S., Lauer J.T., Talke F.E., Wang G. and Judy J. (1997): Friction and wear studies of carbon overcoated thin fdms magnetic sliders: applications of Raman microscopy. - ASME J. of Tribology, vol.l 19, pp. 150-154.
• [14] Zhang M.Q., Friedrich K. Batzar K. and Thomas P. (1996): Abrasive wear mechanisms of flouropolymer based composite coatings on aluminum substrates - Wear, vol.200, pp. 122-136.
• [15] Zhang X. and Kato K. (1996): Friction model of thin solid fdm lubrication. - Trans, of the ASME, vol.ll8, pp.693-697.