Brazing concept

An intermediate product for joining and/or coating by brazing comprising plates and/or parts of products of a base metal and a blend, said base metal having a solidus temperature above 1040° C., wherein the intermediate product has a surface layer formed from the blend on at least part of a surface of the base metal, wherein the blend consists of:

• a boron source selected from the group consisting of boron, B4C, B4Si, NiB, and FeB, a silicon source selected from the group consisting of silicon, FeSi, SiC, and B4Si, and at least one binder selected from the group consisting of polyesters, polyethylene, polypropylene, polyvinyl alcohol, polyvinyl acetate, and polystyrene, wherein boron and silicon of the blend are present in a ratio of boron to silicon within a range from about 3:100 wt/wt to about 100:3 wt/wt, and wherein the amount of binder in the blend is 35.7% to 55.5% by weight of the total composition.

A pre-brazed product for brazing comprising plates and/or parts of products of a base metal having a solidus temperature above 1040° C., which pre-brazed product is obtained by applying a surface layer formed from a blend on a surface of at least one of the plates and/or the parts of products of the base metal, which blend consists of:

• a boron source selected from the group consisting of boron, B4C, B4Si, NiB, and FeB, a silicon source selected from the group consisting of silicon, FeSi, SiC, and B4Si, and at least one binder selected from the group consisting of polyesters, polyethylene, polypropylene, polyvinyl alcohol, polyvinyl acetate, and polystyrene, wherein the amount of binder in the blend is 35.7% to 55.5% by weight of the total composition, wherein boron and silicon of the blend are present in a ratio boron to silicon within a range from about 3:100 wt/wt to about 100:3 wt/wt, wherein the base metal and the surface layer has been exposed to a temperature higher than the solidus temperature of a brazing alloy formed in a molding process of the base metal and the base metal and the blend and lower than the solidus temperature of the base metal, and an obtained layer of the brazing alloy is on a surface of at least one of the plates and/or the parts of products of base metal.