Reaction layer at the interface between aluminium particles and a glass substrate formed by cold spray

A low-density interface layer of thickness up to 80 nm was found and characterized at the interface between cold-sprayed Al particles and a soda-lime glass substrate with transmission electron microscopy. The layer was composed of amorphous and nano-crystalline grains, and had a different chemical composition from Al and glass. It is suggested that the layer resulted from the reaction of the sprayed Al with glass, and that it acted as a bonding layer between them.