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Licensed Unlicensed Requires Authentication Published by De Gruyter October 16, 2013

Microstructure and Mechanical Properties of HVOF Sprayed WC-Co/NiCrBSi, Cr3C2 Coatings on Al Alloys

Mikrostruktur und mechanische Eigenschaften von hochgeschwindigkeitsflammgespritzen (HVOF) WC-Co/NiCrBSi und Cr3C2 Schichten auf Aluminiumlegierungen
  • Serkan Özel
From the journal Materials Testing

Abstract

In this study, WC-Co/NiCrBSi and Cr3C2 powders were coated on surface of Al alloys (AA7075-T651, AA5083, AA2024-T4) by using HVOF (High Velocity Oxy Fuel) process. The coated samples were characterized by means of a scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX, XRD), hardness and bonding strength. These results showed that the maximum hardness and minimum surface roughness have been obtained at specimens coated with WC-Co. The bonding strengths of specimens used AA2024-T4 substrates were maximum. XRD study revealed that WC, W2C, C, Co, Cr3Ni2SiC, W5Si3, Cr7C3, Cr3C2, Cr, and Ni phases are present in the coatings.

Kurzfassung

In der diesem Beitrag zugrunde liegenden Studie wurden WC-Co/NiCrBSi und Cr3C2-Pulver auf die Oberfläche von Aluminiumlegierungen (AA7075-T651, AA5083, AA2024-T4) mittels des HVOF (High Velocity Oxy Fuel) Prozesses aufgebracht. Die beschichteten Proben wurden mittels REM-Untersuchungen und energiedispersiver Röntgenspektroskopie (EDX, XRD) sowie hinsichtlich ihrer Härte und Bindungsfestigkeit charakterisiert. Die Ergebnisse zeigen, dass die maximale Härte und geringste Oberflächenrauheit bei den Proben, die mit WC-Co beschichtet waren, auftrat. Die Bindungsfestigkeiten erreichten ihr Maximum bei den Proben mit einem Substrat mit AA2024-T4. Die XRD-Untersuchungen ergaben, dass die Beschichtungen WC, W2C, C, Co, Cr3Ni2SiC, W5Si3, Cr7C3, Cr3C2, Cr und Ni Phasen aufweisen.

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Published Online: 2013-10-16
Published in Print: 2013-09-02

© 2013, Carl Hanser Verlag, München

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