Low damage cutting and bonding process of high performance composite materials and its systematizing

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Low damage cutting and bonding process of ceramics/metal composite material has been investigated to establish the high reliability material processing of high performance materials. A abrasive waterjet cutting method with ultra high pressure water was employed for cutting procedure. And a solid phase bonding for relatively low temperature joining procedure of the composite materials to realize low heat-affected weld joint.As a result, it was clarified that a cantilever method with a data treatment procedure of computer tomography type has a high adaptability to measure the high pressure distribution pattern of the waterjet for cutting process. Then, the waterjet strictures were examined with snap photos an addition to the measured momentum distribution of waterjet, so that the relationship between the jet structure and the cut surface quality was made cleared. So, it was concluded that the use of ultra long throat length type of abrasive nozzle is useful to realize high performance cut surface without heat-affected part.In the solid state bonding, a high performance bonding procedure of Al_2O_3 ceramics to Ti was examined with a metal-deposited ceramics for substrate. In the present study, evaporation method was employed for the deposition. The joint strength was evaluated with the Auger analysis. Then, it was clarified that the joint part becomes sound, if the deposition was done. Moreover, the fitting process of both surfaces was examined, so that effect of surface roughness was indicated to be important for the fitting.At last, it was designed the low damage cutting and joining process by using both consideration results.