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

冷喷涂Al涂层在陶瓷表面的结合强度随喷涂角度的减小而增加。在冷喷涂Al颗粒与钠钙玻璃基板的界面处发现了厚度为50~100 nm的低密度界面层，并用透射电子显微镜对其进行了表征。涂层由非晶态和纳米晶组成，化学成分与铝和玻璃不同。冷喷涂铜铝涂层经超声冲击处理后，其影响范围从几十μm到几百μm，且在距表面10μm处观察到纳米晶结构。

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.