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Investigation of Microstructure and Tribological Properties of Al/Al2O3+Gr Hybrid Composite

M. A. MATARA1, I. CSÁKI1,* , G. POPESCU1, M. LUCACI2, M. LUNGU2

Affiliation

  1. University “Politehnica” Bucharest, Materials Science and Engineering Department, Splaiul Independentei Blvd. no. 313, 060042, Bucharest, Romania
  2. INCDIE ICPE-CA, Bucharest, Romania

Abstract

The present work aim is the investigation on the microstructure and tribological properties behavior of a hybrid aluminum matrix composites reinforced with 4.5 wt.% alumina (Al2O3) and 0.5 wt.% graphite (Gr) particles. Alumina particles were used as reinforcing material because it provides a high strength and hardness and graphite particles for its lubricating properties. The composite material was processed by powder metallurgy route. The powders mixture having the above mentioned composition was mixed using a high energy planetary ball mill for 3 h at 250 rpm. Starting from non-granulated and granulated powders mixtures, green compacts were obtained by compacting with pressures ranging between 100 and 600 MPa using a uniaxial hydraulic press, followed by a three steps sintering process realized at 3000C for 30 min, 4500C for 30 min and at 6200C for 1 h in argon atmosphere. Tribological properties were investigated due to their importance that derives from the fact that the friction phenomenon particularly affects machinery and equipment functionality. The results were influenced by the processing of the powders mixtures, the compacting pressure applied to obtain green compacts, the homogeneity of the obtained microstructure after sintering process and the tribological testing conditions..

Keywords

Hybrid composites, Compacting, Sintering, Tribology.

Submitted at: April 4, 2015
Accepted at: Oct. 28, 2015

Citation

M. A. MATARA, I. CSÁKI, G. POPESCU, M. LUCACI, M. LUNGU, Investigation of Microstructure and Tribological Properties of Al/Al2O3+Gr Hybrid Composite, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 11-12, pp. 1849-1854 (2015)