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3772 |
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Thursday, May 22, 2014, Hall H3 3:20 PM Cold Gas Spraying 3 |
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Properties and comparison of WC-25/17/12Co cold spray coatings |
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Sergi Dosta / Thermal Spray Centre (CPT) - Universitat de Barcelona, SPAIN Miguel Couto* / Thermal Spray Centre (CPT) - Universitat de Barcelona, Spain Javier Fernández/ Thermal Spray Centre (CPT) - Universitat de Barcelona, Spain Jens Putzier/ PUTZIER GMBH, Germany Josep Maria Guilemany/ Thermal Spray Centre (CPT) - Universitat de Barcelona, Spain |
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After having successfully produced WC-25Co, WC-17Co and WC-12Co coatings by Cold Gas Spraying, their mechanical and electrochemical properties are studied and compared in this work to understand the advantages when confronted with conventional thermal spray techniques, i.e. HVOF. The addition of more ductile Co binder to the composite makes deposition by CGS easier while conferring properties that differ to those achieved with a WC-Co cermet with a lower content of ductile binder. XRD tests were run on the powder and coatings to confirm no phase changes during the spraying process. Bonding strength and mechanical properties of the coatings were measured. The corrosion resistance was determined by electrochemical measurements and salt fog spray test |