Back to Ganoksin | FAQ | Contact

Titanium Contamination


#1

I have recently discovered that my boss has been grinding titaniun
rings out at my bench, using my tools.

I have been getting a very large failure rate on my solder joints
(50%) for the last few months, and despite the obvious going back to
cleanliness standard, joint failures have continued.

During the last week, after discovering this, I have used different
tools that I now keep hidden and I have not had a single failure. I
have tried to talk to him about this and he says he doesn’t see the
conection or the danger!!! Please, has anyone else had any
cross-contamination issues between gold and titanium???

Barb Horton
Kamloops BC Canada
@Horton_Family


#2
has anyone else had any cross-contamination issues between gold and
titanium???

titanium filings and particles, as with any form of titanium
instantly form an impervious oxide layer on contact with air. That
generally prevents good bonding or wetting by solders, though you can
get a bit of joinint with enough flux. But the bonds are not good.
So if you’ve got titanium particles imbedded in your solder, first
off, like any dirt, it will lead to pits and messy joints. Plus, with
a different thermal expansion rate that the gold, it might lead to
stresses in the joints. And given the very light weight of titanium
grindings and filings will fly around more than will gold, so might
easily get everywhere on your bench, and could easily get onto
soldering pads, into the flux containers, or whatever. And, I’m not
sure, but it might even form a microalloy type of contaminant, as one
can get an almost 24K gold that’s microalloyed with titanium, making
it about the same hardness as 18K, and with some different working
properties too. In general, while larger pieces of titanium (such as
solder pics) should be safe enough, the idea of titanium dust flying
around where your soldering gold, just might not be too bright an
idea, and might well be involved in your problems. Even if I can’t
tell you for sure, it seems clear enough that your own experiment by
using different tools to solve the problem seems a pretty good
indictment of the titanium dust.

And finally, does your boss pay for your tools or do you? Mention to
him that titanium is rather hard on steel tools, dulling burs and
files very quickly. So if he’s using tools he pays for, he’s making
your job harder and slower by bessing up the tools he pays you to
work with. And if, as is often the case, you pay for your own tools,
then get mad and tell him to buy his own damn tools and keep his
hands off of yours, cause he can quickly shorten the life of your
tools by using them on titanium.

You might suggest, for this task, the use of rotary diamond
abrasives, such as the 3m diamond sanding bands. Used with oil or
water for lubrication, the lubricant also keeps down the dust
generation. And he can grind a lot of titanium with those sanding
bands. If he mounts them on an appropriate mandrel fixed to an
adapter chuck for the polishing motor, then he can do his grinding
with that fixed motor safely removing the grindings as well, and
keeping your bench free of the dust. Both Stuller and Rio carry the
diamond sanding bands. with lubricant, they last quite well (I use
mine with platinum, and even with daily frequent use, they last
several months on average. Probably would last even longer if I were
more careful about the lube)

HTH
Peter Rowe


#3

I am sorry to disagree with Mr. Rowe but I feel that it is very
unlikely there is any “microalloying” going on between titanium and
gold…This would only happen at expremely elevated temeratures and
the process would take time…It would be happening through the
process of dissolution which requires time and residence “or
contact:” as liquids…I don’t see it as possible. I am very
doubtful about it…( I have been in the ti industry 15 years and
can tell you from experience in the manufacture of titanium
alloys)…

You could be getting dust contamination if your surroundings are not
kept clean but the dust will be highly oxidized ( and pacified) and
unrecognizable as titanium as an element.

It does have different coefficient of xpansion tendencies from gold
so you could be getting stresses as opposed to contamination.

I am interested in what you are seeing…Tell me more

Scott Jackson

Tinomics Inc.
#1 Tom Rab Lane SW
Ft Myers, Florida 33907
330-412-1767 cell
239-425-0715 office
239-425-0716 fax
scoot77@aol.com

Tinomics makes small titanium castings for jewelry, medical,
consumer and aerospace markets.


#4

I have to agree with you Scott. I have been around precious metals
and titanium too long to think there is a cause and effect here.
There is something else going on. Precious metal solders (alloys)
can be fickle. I would start there in an attempt to eliminate the
possibilities.

Bill

Reactive Metals Studio, Inc.
PO Box 890 * Clarkdale, AZ 86324
Ph-928/634-3434 * Ph-800/876-3434 * Fax-928/634-6734
E-mail- @Michele_Deborah_Bill
Catalog- www.reactivemetals.com