On Nov 24, 4:04 pm, "claude" wrote:
Is there someone out there who can clarify a mystery for me. I have just
bought all sorts of titanium drill bits and have other tools that they say
contain titanium. I don't get it, working on a titanium aircraft part with a
normal chrome molly tool will destroy that titanium part. So how can they
alloy or coat a drill bit that won't react to itself or to the part you are
working on at the molecular level? The only explanation I can think of right
now is that the titanium they mention is bull and is just a fancy colored
coating.

The tools work well enough but I am a very curious individual.

It is not a titanium coating. It is a titanium _oxide_ coating.
Oxides are frequently far harder than the principal element. Aluminum
oxide, one of the softer metals, is used as an abrasive and is very
hard.

R