Yep what he said,
I made my own Ti seals in 1994, they were fucked
There is a reason it is used as a rubbing block on the bottom of F1 cars LOL. MASSIVE SPARKS.
If you ever tried to grind Ti on abrasive belts, good luck you will see what we are both saying
to cut it is fine (machines great!) but "rubbing" its a disaster as natural as a homo having sex.
The Ti will need some sort of coating or insert on all the seal slots to work.