IMPROVEMENT OF THE ADHESION STRENGTH OF THE METAL COATINGS BY COLD SPRAY AND THE FORMATIN OF THE METAL THICK COATING ON CERAMIC SUBETRATE

陶瓷基体上冷喷涂Al涂层的结合强度随喷涂角度的减小而增大。用透射电子显微镜观察了冷喷涂Al粒子与玻璃基体的界面，发现了一层厚度为50 ~ 100 nm的低密度界面层。该层由非晶和纳米晶粒组成，并且具有与Al和玻璃不同的化学成分。冷喷涂铜、铝涂层经超声冲击处理后，其冲击区可达几十μm ~几百μm。此外，在距离表面10 μm处，镀层中还观察到了纳米晶结构。

The adhesion strength of Al coatings formed by cold spray (CS) on ceramic substrates increased with a decrease in the spray angle. A low-density interface layer of thickness 50 - 100 nm was found and characterized at the interface between coldsprayed 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. The cold sprayed copper and aluminum coatings subjected to an ultrasonic impact treatment (UIT) has an affected zone of several tens of μm to several hundred of μm. Furthermore, nano-crystal structure was observed at 10 μm from surface in copper coating.