Development of New Explosive Bonding Technique for Joining Metal and Ceramic Using Underwater Shock wave

本研究试图开发一种利用调节水下冲击波进行爆炸粘结的新方法。利用这种方法，金属薄板在500-1000m/S的速度下很容易被加速，其高度足以实现金属与陶瓷的爆炸结合。对于Al/ZrO2爆炸连接接头，虽然界面呈平面结构，但连接条件良好。通常情况下，金属之间存在波状界面，但由于陶瓷缺乏延展性，目前的I组合需要平面界面。陶瓷的变形是不允许的，在使用的陶瓷中容易产生裂纹。这种结合也是基于爆炸结合的机制，这是由于所用金属中形成的射流激活了平板表面。对于目前所采用的结合来说，结合并不是很困难，但有时会发现裂纹，这取决于所使用的陶瓷的质量。当使用的陶瓷材料中存在大量气孔时，应根据其力学性能选择合适的陶瓷材料。同时，采用粗、短陶瓷块是消除裂缝的有效方法。这使得可以减少所使用的陶瓷样品的偏转。

The present investigation tried to develop a new method for explosive bonding using regulated underwater shock wave. Using the method, a thin metal plate is easily accelerated at 500 - 1000 m/s, which is high enough to achieve the explosive bonding of metals and ceramics. For the explosively bonded Al/ZrO_2 joint, the bonding condition is quite good though the interface shows planar structure. Normally, wavy interface is found between metals, but the present I combination requires planar interface because of the lack of ductility for ceramics. Deformation of ceramic is not permitted and it easily induces cracks in the ceramic used. The bonding is also achieve based on the explosive bonding mechanism which is due to the activation of the plate surface by the formation of jet in the metal used.The bonding is not very difficult for the present combonation employed, but the cracks are sometimes found depending on the quality of the ceramic used. Once there are many pores in the ceramic used, Therefore, the ceramic should be chosen carefully considering its mechanical property. Also, the use of thick and short ceramic block is effective to eliminate the cracks. It makes possible to decrease the deflection of the ceramic sample used.