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Proceedings Paper

Wear resistant Al-Si/TiC coatings prepared by high power laser cladding
Author(s): Anandkumar Ramasamy; Amelia Almeida; Rui Vilar
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Paper 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.

Paper Details

Date Published: 21 April 2009
PDF: 8 pages
Proc. SPIE 7131, XVII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 713121 (21 April 2009); doi: 10.1117/12.817841
Show Author Affiliations
Anandkumar Ramasamy, Instituto Superior Técnico, Univ. Técnica de Lisboa (Portugal)
Amelia Almeida, Instituto Superior Técnico, Univ. Técnica de Lisboa (Portugal)
Rui Vilar, Instituto Superior Técnico, Univ. Técnica de Lisboa (Portugal)


Published in SPIE Proceedings Vol. 7131:
XVII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers
Rui Vilar; Olinda Conde; Marta Fajardo; Luís O. Silva; Margarida Pires; Andrei Utkin, Editor(s)

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