DFT wire is a metal-to-metal composite developed to combine the desired physical and mechanical attributes of two or more materials into a single wire or ribbon system. As a result of extreme compressive forces imparted during the processing of the dissimilar materials, the mechanical bond formed between surfaces has been found to be metallurgically sound. This feature has given rise to a number of novel applications of DFT wire, cable or ribbon.
One of the more common uses of DFT wire is found in the medical device industry, where designers have integrated the strength and biocompatibility of implant grade alloys with desired properties of other materials. The composite typically uses the outer sheath to impart strength, while the core material is designed to provide conductivity, radiopacity, resiliency or MRI enhancement.
DFT wire enables the unique ability to match dissimilar materials to provide a variety of properties in a single wire system. This technology can be utilized by the engineer to resolve technical issues cost effectively.
Fort Wayne Metals has the capability to create these DFT wire materials in sizes from 0.050" to 0.001" or smaller depending on the constituents.
Values and Compositions
A typical 35N LT®/Silver DFT wire material (35N LT) may have a variety of tensile values depending upon the amount of cold work and core percentages of the individual wires (see Fig. 1). In addition, the table in Fig. 2 is presented to compare the electrical resistivity of various core percentages to that of solid 35N LT wire, a common pacemaker lead material.
35N LT, MP35N, 316LVM and FWM 1058 tubing is kept in stock for the outer sheath. Core wire options, in wire form, are more abundant in general inventory.