Lavrentyev AI, Beals JT
United Technologies Research Center, East Hartford, CT 06108, USA.
Ultrasonics. 2000 Mar;38(1-8):513-6. doi: 10.1016/s0041-624x(99)00045-1.
This paper presents an ultrasonic method for measurement of diffusion bond strength between two identical materials. The method requires a single normal-incidence ultrasonic measurement. When a diffusion bond is not perfect some ultrasonic energy is reflected from the interface separating the two substrates. Amplitude of a reflected signal correlates qualitatively with the bond strength. However, a quantitative correlation is difficult to establish since reflected signal amplitude depends on parameters of the test equipment. We introduce a spectroscopic analysis of a reflected signal to measure the bond strength. We show experimentally that an imperfect diffusion bond can be characterized by a single parameter: interfacial spring stiffness. The stiffness can be determined from the reflected signal spectrum and does not depend on testing equipment. It is also demonstrated that for a particular diffusion bonding procedure as applied to tool steel the interfacial stiffness correlates quantitatively with bond strength.
本文提出了一种用于测量两种相同材料之间扩散结合强度的超声方法。该方法需要进行单次垂直入射超声测量。当扩散结合不完美时，一些超声能量会从分隔两个基底的界面反射回来。反射信号的幅度与结合强度存在定性关联。然而，由于反射信号幅度取决于测试设备的参数，所以难以建立定量关联。我们引入对反射信号的光谱分析来测量结合强度。我们通过实验表明，不完美的扩散结合可以由一个单一参数来表征：界面弹簧刚度。该刚度可从反射信号频谱中确定，且不依赖于测试设备。还证明了对于应用于工具钢的特定扩散结合工艺，界面刚度与结合强度存在定量关联。
