Carbon fiber reinforced polymer (CFRP) had recently been applied to not only wing, but also fan blades of turbo fan engines. To prevent impact force, leading edge of titanium was often mounted on the CFRP fan blades by adhesive force. In order to enhance the joining strength, we suggested a joining method with carbon fiber reinforced interface. By using nickel coated carbon fibers, we successfully developed a joining sample with carbon fiber reinforced interface between CFRP and CFRM. The joining sample with nickel coated carbon fiber exhibited the high tensile strength, which was approximately two times larger than that with non coated one and was also more than 11 times higher than that with conventional adhesion.

By using a complex coated carbon fiber felt constructed with nickel interlayer and aluminum surface skin, copper welding to aluminum is successfully developed. The first step of the welding method is that the felt is contacted and wrapped with molten aluminum, which is solidified under gravity pressure. The second step is that the aluminum welded felt is contacted and wrapped with a molten copper, which is solidified under gravity pressure. The carbon fiber junction device is a fiber reinforced alloy and acts as an ideal joining part of copper and aluminum. Tensile strength of the junction device of carbon fiber reinforced Cu 25 at Al alloy is higher than those of a Cu 25 atAl alloy and an aluminum rod.