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

目前的研究试图开发一种使用调节水下冲击波进行爆炸粘合的新方法。利用该方法，薄金属板很容易被加速到500-1000m/s，这个速度足以实现金属和陶瓷的爆炸连接。对于爆炸连接的Al/ZrO_2接头，虽然界面呈现平面结构，但连接状况良好。通常，金属之间存在波状界面，但由于陶瓷缺乏延展性，目前的组合需要平面界面。陶瓷的变形是不允许的，否则容易引起所用陶瓷的裂纹。这种结合也是基于爆炸结合机制实现的，该机制是由于所用金属中形成射流而激活板表面。对于目前所采用的组合来说，结合并不是很困难，但有时会发现裂纹，具体取决于所用陶瓷的质量。一旦所使用的陶瓷中有很多孔隙，因此，应仔细考虑其机械性能来选择陶瓷。另外，使用厚而短的陶瓷块也能有效消除裂纹。它可以减少所用陶瓷样品的挠度。

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.