Friction Welding of Silicon Carbide to Nickel with Intermediate Layer(Materials, Metallurgy & Weldability)

概要

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An attempt has been made to apply the friction welding to the ceramics-to-metal joining with the aid of intermediate layers of active metals. The ceramics and metal specimens employed are a pressureless-sintered silicon carbide and a commercially pure nickel. The joint of SiC to Ni bonded without an intermediate layer were fractured without external load immediately after the bonding. Similarly, the joints bonded with the intermediate layers of zirconium and niobium were also fractured immediately after the bonding. On the other hand, the joint strength was improved pronouncedly by the use of the intermediate layer of aluminum. The maximum tensile strength of the joint with the aluminum intermediate layer reached about 130MPa comparable with reported values of the strength of the diffusion-bonded and brazed joints. The dependence of the joint strength on welding parameters, friction time and forge pressure, is discussed on the basis of the observation of the microstructure and fracture morphology of the joint.
大阪大学の論文