Bonding Characteristics Between Ceramics and Metals

作为一种评价给定陶瓷与金属之间压力可焊性的简单方法，提出了切削试验。在测试中，金属在车床上切割，待测试的陶瓷在其角落。在切削过程中，新生的清洁金属表面在高压下与刀具面直接接触并滑过刀具面。可以通过改变切割速度和其他条件来控制接触处的温度。也就是说，通过这种切割可以很容易地实现与摩擦焊接相似的条件。对于可焊性的评价，研究了以下三种方法；1 .陶瓷刀具表面金属粘附痕迹的显微观察；2 .检查短长度切削后刀面遗留的粘屑；对受焊接敏感影响的加工表面粗糙度的检验。将切削试验结果与超声焊接的可焊性进行了比较，发现两种方法的可焊性具有较好的一致性。对超声焊接界面温升进行了研究，发现界面温升约为500K，在常规切割试验的切割温度范围内。

As a simple method for the evaluation of pressure-weldability between a given set of ceramics and metal, cutting test is proposed. In the test, the metal is cut on a lathe with the ceramics to be tested at their corner. During the cutting, newly born clean surface of metal is in direct contact with the tool face at high pressure and slides over the face. The temperature at the contact can be controlled by changing the cutting speed and other conditions. Namely, the conditions similar to the friction welding can be realized easily by this cutting.For the evaluation of weldability, following three methods were examined ;1. microscopic observation of traces of adhered metal on the ceramic tool face,2. check of adhered chip left on the tool face after a short length of cutting,and3. examination of machined surface roughness which is sensitively affected by the welding.The results of the cutting test were compared with the weldability in the ultra-sonic welding, and fairly good coinsidence in the two methods were observed.Temperature rise at the interface in ultrasonic welding was studied and found to be about 500K, which is in the range of cutting temperature in the usual cutting test.