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Titanium Chain - What does the size mean?
In Niobium & Titanium
Titanium Chain - What does the size mean?
In Niobium & Titanium
Drawing Titanium Wire
In Niobium & Titanium
michele104
Sep 03, 2020
Hi Bob, I actually asked Bill this question as I figured it was pretty complex. Here is his answer: Ti is notoriously difficult to draw. That is why you don't here people talking about doing it. The question is can you afford to ruin a draw plate for a draw down of .007"? In the wire drawing mills Ti is annealed in an atmospheric oven. The oxides are allowed to build up on the surface. This porous oxide layer is then used to carry a molybdenum disulfide lubricant. The wire is drawn close to size. It is then cleaned and acid etched to the final diameter. That is why most Ti wire has a soft acid etch. The mills that produce smooth metal have a proprietary process. So, why the problem? Ti is considered a gooey metal, it is also not very thermally conductive so heat travels slowly in it. If you were to draw it through a steel plate it may weld itself in the hole with no way to get it out. It may also gaul. Is it worth it for .007"? Here is a bit from a thread on drawing wire from Jim Binnon... "I can say from experience that you can draw titanium wire with some success using copper as the lubricant. To do this a copper tube is drawn over the Ti wire and then both are drawn through the plate. After the drawing the copper is etched off the Ti wire. The surface is not great but it is no worse than most Ti wire I have bought. It is not an easy process as the coper tube will often break and require the removal of the remaining copper and then continuing on with a new tube but I have reduced Grade 2 by 30% in this manner. The real problem is annealing the Ti for further reduction as I do not have a vacuum furnace and this is required to do the annealing with out making the Ti brittle from absorbing oxygen, hydrogen, nitrogen in the annealing process. If you have carbide draw plates you might be able to use tube with higher tensile strength than copper like carbon steel this might reduce the breakage of the tube but I don’t know for sure" Good luck , Bill
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Where do you get your niobium from? Do you know if it is ethically sourced?
In Niobium & Titanium
michele104
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