INFLUENCE OF CARBON-FIBER INTERLAYER ON JOINING ALUMINA STAINLESS-STEEL BY AGCUTI BRAZING ALLOY

In the paper the influence of short T 300 carbon fibre embedded by two Ag72Cu26.5-Ti1.5 brazing alloy foils as an interlayer is presented wh en joining alumina and stainless steel. Carbon fibre interlayer lowers the thermal expansion mismatch between both constituents so that crac king of the ceramics does not occur. Shear strength of the joint with the carbon fibre interlayer was 35 MPa in comparison with the one with out the carbon fibre interlayer which was 6 MPa. Titanium from the bra zing alloy diffuses into both interfaces as well as around each carbon fibre. Similarly, chromium diffuses to the ceramic-brazing alloy inte rface as well as around each carbon fibre. After brazing neither titan ium nor main steel elements (Fe, Ni, Cr) are present in the brazing al loy itself.