Abstract: A brazing method includes assembling a first member and a second member, the first member including a base plate made of a ferrous material and a diffusion suppressing layer laminated on the base plate and made of a Ni—Cr alloy including more than about 15% and less than about 40% of Cr, the second member being disposed on the first member with a brazing material of a Cu—Ni alloy including more than about 10% and less than about 20% of Ni therebetween, and maintaining the temporary assembly at a temperature of more than about 1,200° C. to fuse the brazing material and diffuse Ni atoms and Cr atoms into the fused brazing material to form the braze joint, causing the resulting brazing material to have an increased melting point due to the Ni and Cr contents of the braze joint to self-solidify the braze joint, and then cooling the resulting assembly.

Abstract: A brazing method which provides a braze joint having excellent corrosion resistance and a brazed structure including such a braze joint includes assembling a first member and a second member to be joined into a temporary assembly, the first member including a base plate made of a ferrous material and a diffusion suppressing layer laminated on the base plate and composed of a N—Cr alloy essentially including not less than about 15% and not greater than about 40% of Cr, the second member being disposed on the diffusion suppressing layer of the first member with intervention of a brazing material of a Cu—Ni alloy essentially including not less than about 10% and not greater than about 20% of Ni, and maintaining the temporary assembly at a temperature of not less than about 1,200° C.

Abstract: A brazing method which provides a braze joint having excellent corrosion resistance and a brazed structure including such a braze joint includes assembling a first member and a second member to be joined into a temporary assembly, the first member including a base plate made of a ferrous material and a diffusion suppressing layer laminated on the base plate and composed of a Ni—Cr alloy essentially including not less than about 15% and not greater than about 40% of Cr, the second member being disposed on the diffusion suppressing layer of the first member with intervention of a brazing material of a Cu—Ni alloy essentially including not less than about 10% and not greater than about 20% of Ni, and maintaining the temporary assembly at a temperature of not less than about 1,200° C.

Abstract: A method of production of an inexpensive corrosion-resistant heat exchanger made of stainless steel including the steps of electroplating chrome to a thickness of 15 &mgr;m on at least one of the end faces of a plurality of first and second shaped plates made of stainless steel alternately stacked in the thickness direction so as to form a chrome-based brazing filler metal layer, then electrolessly plating or electroplating Ni-P to a thickness of 35 &mgr;m on the chrome-based brazing filler metal layer to form a nickel-based brazing filler metal layer. The first and second shaped plates are brazed together through the chrome-based brazing filler metal layer and the nickel-based brazing filler metal layer to obtain a high corrosion resistant heat exchanger. Due to this, a high corrosion resistance brazing filler metal containing an Ni-Cr28-P8-etc. alloy composition is obtained at the two end faces of the first and second shaped plates.