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Low-Melting Ti-Zr Based Braze Alloy

Detailed Technology Description

New brazing alloys, also known as "filler alloys," have been developed at Case Western Reserve University (CWRU) by Dr. Dongmyoung Lee and Dr. Gerhard Welsch. The purpose of the alloys is to lower

*Abstract

New brazing alloys, also known as "filler alloys," have been developed at Case Western Reserve University (CWRU) by Dr. Dongmyoung Lee and Dr. Gerhard Welsch. The purpose of the alloys is to lower the melting temperatures (860-950 oC) of iron-based and nickel-based alloys by the addition of P, B, C, and Si (10-25 atomic %). The advantages of lower melting temperatures include suppression of grain growth of the base metal and increase energy savings in process time and temperature. The alloys are targeted to substitute for steel braze alloys such as B-Ni series and B-Cu series (880-1083 oC).The alloys from CWRU can be modified by the addition of Cr for an elevated temperature brazing of stainless steel, which requires oxidation resistance through use of a recuperator and high temperature heat exchanger.Iron-Based Brazing Alloys (CWRU Ref 2014-2639):Low-melting iron-based alloys provide an economical approach for joining of iron-based alloys, interdiffusing the filler-alloy elements with those of the base material. Base materials such as carbon steels, alloy steels, cast irons and stainless steels can be braze-joined, braze-repaired, or braze-coated with the CWRU low-melting iron-based filler alloys. Such processes can be carried out at relatively low temperatures (920 to 1050 oC) without causing undesired grain growth or property degradation in the base material(s).Nickel-Based Brazing Alloys (CWRU Ref 2014-2640):Low-melting nickel-based alloys have also been developed for braze-joining, repairing or coating nickel alloys including nickel-based superalloys, as well as for iron alloys, including alloy steels, stainless steel and cast irons. Such processing can be done at relatively low temperatures (865 to 990 oC) without causing undesired grain growth or degradation of properties in the base material(s).Ti-Based Brazing Alloys (CWRU Ref 2014-2638): Low-melting titanium-based alloys useful for braze-joining and metals-to-ceramics bonding applications provide good corrosion resistance.

Country/Region

USA