Fretting wear characteristics of cold gas-dynamic sprayed aluminum alloys

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Journal titleTribology International
Pages14071416; # of pages: 10
SubjectAcceptable limit; Coating compositions; Cold gas-dynamic spray; Damping capacity; Dynamic friction; Fine powders; Fretting wear; Fuel injection systems; High pressure gas; High velocity; Mechanical components; Mechanical performance; Nominal loads; Optimum process conditions; Powder composition; Process condition; Process selection; Repair technology; Spraying techniques; Surface coatings; Tribological characteristics; Tribological properties; Aluminum; Aluminum castings; Cerium alloys; Damping; Fretting corrosion; Friction; Fuel injection; Gas dynamics; Metal casting; Protective coatings; Stainless steel; Steel research; Surfaces; Tribology; Wear resistance; Aluminum coatings
AbstractProcess selection for repair of mechanical components due to wear and corrosion, e.g. damage of aluminum casting housings of fuel injection systems, is based on cost and response time factors, provided that the mechanical performance is maintained within acceptable limits. One of the promising and emerging repair technologies is Cold Gas-Dynamic Spray (CGDS) coating, where a high-pressure gas propels fine powder particles to very high velocities to produce surface coating. It is essential to identify the optimum process conditions and powder composition to produce repaired surfaces with tribological properties close to those of the originally manufactured part (without coating). The objective of this work is to compare the dynamic friction and fretting wear properties of the repaired surfaces using various types of coating composition and spraying techniques. Eight types of CGDS coatings, applied to AMS 4260 aluminum specimens, were fretted against 440C stainless steel specimens at low and high nominal loads to assess their fretting wear resistance, dynamic friction properties and damping capacity. The optimum coating composition and process conditions were identified. In comparison to the uncoated specimen, this optimum coating offered tribological characteristics close to the uncoated material and even better dynamic friction properties. © 2010 Elsevier Ltd. All rights reserved.
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AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21271364
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Record identifierb24981cc-a2cc-4c40-b6cb-68cac56106d1
Record created2014-03-24
Record modified2016-05-09
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