Strength of Carbon Fiber Reinforced Cu-25 at%Al Alloy Junction Device *

By using a duplex-coated carbon fiber felt, 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 aluminumwelded felt is contacted and wrapped with a molten copper, which is solidified under gravity pressure. The carbon fiber junction device is a fiberreinforced alloy and acts as a 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

Effects of Electron Beam Irradiation on Impact Value of Carbon Fiber Reinforced Thermoplastic Polyetheretherketone

Influences of electron beam (EB) irradiation on the impact value for soda glass were studied by a standard Charpy impact test. EB irradiation below 0.0432 MGy, which was one of short-time treatments of dry process at low temperature, increased impact values of the glass. As the EB irradiation generated dangling bonds at the weaker-bonded metal-oxygen atomic pairs in the soda glass, partial relaxation occurred at points of residual strain near dangling bonds in the network structure mainly constructed with the stronger-bonded metal-oxygen pairs. If the inter-atomic distance of the stronger-bonded metal-oxygen pairs became to be optimum potential curves of the sodium glass, the relaxation should increase the bonding energy of the network structure. Evidently, the increased impact value was mainly due to an increase in the bonding energy for the stronger-bonded metal (Si or Al)-oxygen atomic pairs in the atomic network structure, as well as a relaxation of the network structure

High power bi-materials for actuators

Six kinds of new actuator materials such as Fe-Pd alloy film, hydrogen storage alloy film, hydrogen storage bi-polymer, polymer-metal bi-metal, glass-crystal bi-metal and bi-ceramics glass were developed. The powers of these actuator bi-materials, Fe-Pd alloy film and hydrogen storage alloy film, were larger than that of Ni-Ti alloy commercially used