WEAR RESISTANCE OF Al–12 WT.% Si REINFORCED WITH NbC PARTICLES BY LASER CLADDING
Al12Si–NbC composite coatings were deposited by laser cladding on a substrate of Al–7Si alloy. The microstructure and wear resistance of the coatings were evaluated in comparison to the properties of the substrate and the matrix alloy. The wear resistance was evaluated using ball-on-plate reciprocating sliding tests using an AISI 52100 steel sphere as counterbody. The coatings microstructure consists of NbC particles dispersed in a matrix of α–Al and α–Al/Si eutectic. The reinforcement with NbC particles induces a considerable increase in the average hardness of the matrix material from 85±1 HV to 147±40 HV and in the respective wear resistance. The wear mechanisms involve oxidation, adhesion with plastic deformation and delamination.
Keyword(s): Laser cladding; Al–12Si/NbC coatings; sliding wear.
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