Effect of Nano-NiO Additive on Adhesion Strength and Bubble Structure of Vitreous Enamels
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The effect of NiO nanopowder on the adhesion strength and formation of fish-scales in vitreous enamels has been investigated. The results of a ball drop test indicated that the adhesion strength was greatly increased by a mill addition of NiO nanopowder. The adhesion strength and bubbling microstructure of the enamel were studied using optical and scanning electron microscopy (SEM) in conjunction with energy dispersive spectroscopy (EDS) analysis. The results showed that, as a mill additive, NiO nanopowder changes the composition and structure at the enamel-steel interface and enables interdiffusion. In addition, as the amount of mill addition was increased, the size of the gas bubbles increased and the cracks of the enamel layer, generally referred to as fish-scaling, were reduced.
KeywordsEnamel Mill addition Adhesion Strength Bubble Structure
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