Brazing of graphitegraphite using a new filler technique

Abstract EN

Bracing is one nf the best methods of graphite to graphite or to metals joining.

Bat the major problem associating th? graphite brasdng is the poor wetting by the conventional molten fillers.

For this reason, scientists haw produced a special filler metal based on active elements which interacts with graphite to form carbides.

Also, recently another technique to overcome the wetting problem was introduced by H.

Ohmura and T, Yoshida.

It included inserting an intermediate layer of pure iron foil inside the copper filler.

In the present work* another filler combination of Cu/ stccl/Cu.

foils is proposed as new filler technique for graphite brazing.

It was found that, it produced a succceCcd joint with a good properties consisted of a columnar phase which resulted from the partially dissolution of iron in molten topper► Additionally, the increasing of brazing time causcd reducing the thickness of the steel central layer ar.d increasing the thickness of the columnar phase layers.

The x-ray diffraction tesi developed that, the joints contained two carbide types, iron and copper free elements