Development of an Ultrasonically Augmented Diffusion Bonding Process for Fluidic Control Assembly Fabrication.

摘要

For initial investigations into the feasibility of augmenting the diffusion bonding of titanium fluidic control devices, a flexural-beam configuration was designed and fabricated,on the basis of intensive study of the mechanisms of the diffusion bonding process and the candidate modes of ultrasonic activation. Design problems were encountered,however,in achieving efficient ultrasonic power transmission with this activation mode. In order to achieve a workable system within reasonable time,an alternate arrangement comprising a flexural wedge-reed (shear-mode) ultrasonic system of proven design was fabricated. Effective performance of this equipment was confirmed by lightly bonding simulated fluidic control devices consisting of thirty 1-inch squares of 0.005-inch-thick aluminum at room temperature,using a clamping pressure of approximately 1000psi and an ultrasonic pulse time of 0.6second. A vacuum chamber to contain this equipment and appropriate heating apparatus were also designed and fabricated,to provide a complete functional system. (Author)