Effect of Liquid Phase during Sintering on Mechanical and Tribological Properties of Self-Lubricating Composites

Abstract:

The present work aimed to contribute to the development of high performance self-lubricating sintered composites, with low friction coefficient and high mechanical strength. Self-lubricating composites presenting embedded solid lubricants in a ferrous matrix were produced. Hexagonal boron nitride (hBN) and graphite were the solid lubricants powders added during the mixing step. The composites were processed by conventional powder metallurgy. The liquid phase sintering, by adding copper, improved the degree of continuity of the matrix by rearranging the solid lubricant particles. With this, besides the hardening effect on the matrix, the mechanical properties of the composites were improved, with tensile strength increasing when compared to the same composite without copper. By using the proposed methodologies, optimized composites presenting friction coefficient of 0.12, tensile strength of 500 MPa and scuffing resistance of 29300 N.m were obtained.

• Periodical: Materials Science Forum (Volume 899)
• Pages: 523-527
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.899.523
• Online since: July 2017
• Authors: Renata Steinbach*, Tatiana Bendo, Gisele Hammes, Cristiano Binder, José Daniel Biasoli de Mello, Aloísio Neumo Klein
• Keywords: Liquid Phase Sintering, Self-Lubricating Composites, Sintered Materials, Solid Lubrication

References

[1] C. Busch: Solid Lubrication, Lubricants and Lubrication. (Wiley-Vch, Weinheim2007).

[2] H. Kato, M. Takama, Y. Iwai, K. Washida, Y. Sasaki: Wear Vol. 225 (2003), p.573.

[3] J.D. B de Mello, C. Binder, G. Hammes and A.N. Klein: Wear Vol. 301 (2013), p.648.

[4] J.D. B de Mello, R. Binder, C. Binder and A.N. Klein: Wear Vol. 271 (9–10) (2011), p.1862.

[5] C. Donnet, A. Erdemir: Surface and Coating Technology Vols. 180-181 (2004), p.76.

[6] A. Erdermir: Tribology International Vol. 38, (2005), p.249.

[7] G. Hammes, R. Schroeder, C. Binder, A.N. Klein, J.D.B. de Mello: Tribology International Vol. 70 (2014), p.119.

[8] W.F. Smith: Structure and Properties of Engineering Alloys. (Mc Graw-Hill 1993).

[9] J.K. Lancaster: Tribology International Vol. 23 (6) (1990), p.371.

[10] A. Lipp, K.A. Schwetz and K. Hunold: Journal of the European Ceramic Society Vol. 5 (1) (1989), p.3.

[11] MPIF standard 10, Preparing and Evaluating Tensile Specimens of Powder Metallurgy Materials, Metal Powder Industry Federation, Princeton NJ (1993).