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Stoberska, K.
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article
Detonation sprayed coatings Al 2O 3-TiO 2 and WC/Co on adi investment castings
Abstract
<p>Austempered Ductile Iron ADI posses many mechanical properties thanks them became competitive for many ferrous and nonferrous materials, for example for steels and aluminium alloys. These properties are somewhat limited in a couple of areas. One of them is instability of mechanical properties of ADI in high temperature caused by the separating processes over 400°C in this material. The research shown in this article proposes the detonation gun spraying method which could solve this problem. This article shows the technology of acquiring coatings Al <sub>2</sub>O <sub>3</sub>-TiO <sub>2</sub> and WC/Co detonation sprayed on the base made of austempered ductile iron EN-GJS-800-8 grade. Produced material was the subject of measuring light and electron microscopy. Research results show that sprayed coatings may have thickness form few to several hundreds of micrometers, micro hardness of Al <sub>2</sub>O <sub>3</sub>-TiO <sub>2</sub> coating can have values up to 900HV0.1 and for coatings WC/Co up to 1400HV0,1. This article shows also results of the abrasive wear tests. It was found that surface layer of the austempered ductile iron was hardened as a result of spraying process. This article also presents the results of the coating morphology tests, performed in the zone of connection between coating and base.</p>