Dry Sliding Wear Resistance of the In Situ Al₂O₃/Al-Si Composites Fabricated in Al-SiO₂ by Reaction Hot Pressing

Abstract:

The dry sliding characteristics of three in situ Al₂O₃/Al-Si composites fabricated with volume fraction of 10, 20 and 30 vol.% were investigated. The effect of sliding parameters on the wear properties was investigated. As the sliding velocity increases the wear loss decreases systematically. When the volume fraction increased to 20 vol.%, an improvement of wear resistance was obtained. However, when the volume fraction was 30 vol.%, a further decrease of wear resistance was observed. In case of low volume fraction (10 vol.%), an extensive plastic deformation by plowing out the ductile Al matrix along with narrow grooves was observed. As the volume fraction increased to 20 vol.%, the abrasive wear by micro grooving is dominant as well as the low load is used. Whereas, when the volume fraction increased to 30 vol.%, besides the effect of large pores, the embedded Al₂O₃ in the massive Si blocks formed a weaker interface thereby behaving as source of crakes initiation and propagation. As result, fracture, micro-cutting and delaminating are observed as dominant abrasive wear mechanisms

• Periodical: Advanced Materials Research (Volume 1104)
• Pages: 155-161
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1104.155
• Online since: May 2015
• Authors: El Oualid Mokhnache, Gui Song Wang*, Lin Geng
• Keywords: Composite Materials, Silicon, Sintering, Wear Behavior

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