Improving Tribological Properties of Cast Al-Si Alloys through Application of Wear-Resistant Thermal Spray Coatings |
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Authors: | David Culliton Anthony Betts Sandra Carvalho David Kennedy |
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Affiliation: | 1. Department of Mechanical Engineering, Dublin Institute of Technology, Bolton St, Dublin 1, Ireland 2. College of Sciences and Health and Applied Electrochemistry Group, Dublin Institute of Technology, Kevin Street, Dublin 2, Ireland 3. Centro de Física, Universidade do Minho, Campus Azurém, 4800-058, Guimar?es, Portugal
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Abstract: | Flame Spray Thermal Spray coatings are low-cost, high-wear surface-treatment technologies. However, little has been reported on their potential effects on cast automotive aluminum alloys. The aim of this research was to investigate the tribological properties of as-sprayed NiCrBSi and WC/12Co Flame Spray coatings applied to two cast aluminum alloys: high-copper LM24 (AlSi8Cu3Fe), and low-copper LM25 (AlSi7Mg). Potential interactions between the mechanical properties of the substrate and the deposited coatings were deemed to be significant. Microstructural, microhardness, friction, and wear (pin-on-disk, microabrasion, Taber abrasion, etc.) results are reported, and the performance differences between coatings on the different substrates were noted. The coefficient of friction was reduced from 0.69-0.72 to 0.12-0.35. Wear (pin-on-disk) was reduced by a factor of 103-104, which was related to the high surface roughness of the coatings. Microabrasion wear was dependent on coating hardness and applied load. Taber abrasion results showed a strong dependency on the substrate, coating morphology, and homogeneity. |
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