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

本研究试图发展一种利用水下可控冲击波进行爆炸连接的新方法。使用该方法，薄金属板很容易以500 - 1000 m/s加速，这足以实现金属和陶瓷的爆炸连接。Al/ZrO_2爆炸连接接头界面呈平面结构，但连接状态良好。通常，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。不允许陶瓷变形，这很容易导致所用陶瓷出现裂纹。结合也是基于爆炸结合机制实现的，该机制是由于通过在所使用的金属中形成射流来活化板表面。结合对于目前所使用的结合不是很困难，但是有时会发现裂纹，这取决于所使用的陶瓷的质量。一旦使用的陶瓷中有许多孔隙，因此，应仔细选择陶瓷，考虑其机械性能。采用粗短陶瓷块是消除裂纹的有效方法。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.