21 April 2009 Wear resistant Al-Si/TiC coatings prepared by high power laser cladding
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Proceedings Volume 7131, XVII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; 713121 (2009) https://doi.org/10.1117/12.817841
Event: XVII International Symposium on Gas Flow and Chemical Lasers and High Power Lasers, 2008, Lisboa, Portugal
Abstract
High wear resistance Al-based composite coatings were prepared by laser cladding using powder mixtures of Al-12 wt. % Si+40 wt. % TiC and Al-40 wt. % Si+40 wt. % TiC. In the case of the coatings containing 12 % Si, the microstructure consists essentially of TiC particles dispersed in a matrix of primary α-Al dendrites and interdendritic α-Al+Si eutectic, whereas the Si rich coatings contain primary Si particles dispersed in the matrix. The low-Si coatings present an average hardness of 165 HV and an abrasive wear coefficient in a SiC-containing abrasive medium of 1.4×10-3 mm3 (Nm)-1, while the Si rich coatings present higher hardness of 220 HV but similar wear coefficient. The results show that increasing the Si content does not improve the abrasive wear resistance of the material, despite the 30% increase in hardness. This is explained by the fact that the hardness of Si (1200 HV) is much lower than that of the SiC abrasive particles (2800 HV), thus the primary Si particles do not contribute to reduce the grooving action of the abrasive.
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Anandkumar Ramasamy, Amelia Almeida, Rui Vilar, "Wear resistant Al-Si/TiC coatings prepared by high power laser cladding", Proc. SPIE 7131, XVII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 713121 (21 April 2009); doi: 10.1117/12.817841; https://doi.org/10.1117/12.817841
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