Abstract
In the current study, the effect of bond coat composition and single versus double layers on the interfacial properties of basalt glass-based coatings were investigated. Two bond coats, Ni-5wt.% Al (METCO 450 NS) and NiCr-6wt.% Al (Metco 443 NS) were atmospheric plasma sprayed (APS) onto a commercial AISI 1040 steel substrate. These bond coating powders were used to observe the effect of a bond layer and multiple bond layers on certain mechanical properties, bonding strength and oxidation behaviour. Basalt was melted in a platinum crucible at 1500°C for 1h and cast into water. Basalt glass granules were ground and employed as a coating powder. After the APS process, amorphous coating layers were transformed to crystalline glass–ceramic with a heat treatment process. X-ray diffraction analysis (XRD) was used for glass–ceramic transformation and phase analysis. Scanning electron microscopy (SEM) examinations revealed that there is a uniform coating layer at the macroscopic scale. Cohesive bonding is dominant for both single and double bond-layered samples. It has been observed that the percentage of cohesive strength was approximately three to five times higher than that of the adhesion strength.
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