Can’r speak exactly for vices, but powdered graphite make a mighty good
lubricant for metal on metal.  I use it exclusively on the threads of a chuck
(circular vice-like thing Paddy)  that self tightens when in use spinning big
chunks of timber against me digging in a gouge .
I used to curse at the way it tightened up, but avoided any oil, especially on
the scroll and jaws, becasue that would get thrown off at me, and into the work.
Graphite is my friend for that job.

Richard Wilson
Yorkshireman Galoot