It's probably that TiN that Henry remarked about, it's a solid in the
exhaust like KCl in Galcit compositions, doesn't do any useful expansion in
the nozzle.
TiN is a great surface hardening coating for machine cutting tools, I use
them, many common hardware store drills are coated with it, it's that gold
colored
surface treatment. Very hard.
K
On Sun, Mar 14, 2021 at 4:04 PM Terry McCreary <prfesser@xxxxxxxxxxx> wrote:
FWIW on a quick series of runs with Propep 3, optimum Isp is just under
160 seconds for a TiH2:N2 ratio of 75:25.
Optimum mixture of sorbitol and potassium nitrate is about 155 seconds.
It doesn't appear that the game is worth the candle, unless there are
other whiz-bang kinetic properties that will only show up with testing.
Best -- Terry
------------------------------
*From:* arocket-bounce@xxxxxxxxxxxxx <arocket-bounce@xxxxxxxxxxxxx> on
behalf of Henry Spencer <hspencer@xxxxxxxxxxxxx>
*Sent:* Sunday, March 14, 2021 4:02 PM
*To:* Arocket List <arocket@xxxxxxxxxxxxx>
*Subject:* [AR] Re: TiH2: useful in rockets?
On Sun, 14 Mar 2021, Robert Steinke wrote:
Wikipedia says "Titanium is one of the few elements that burns in pure
nitrogen gas". Maybe for a liquid air hybrid you could make use of the
nitrogen as well? Otherwise, I can't see how it would be superior to
lithium hydride or aluminum hydride.
Might also be interesting with N2O, if the Ti would burn with the N2 and
leave the O to react with the H2. If (dim) memory serves, Ti is just
about as willing to react with nitrogen as with oxygen -- the ash from
titanium burning in air is about 80% TiN -- so maybe that would work.
The TiN would be useless as an exhaust gas, since it solidifies at very
high temperatures, but the energy released might make it worth the
trouble.
Henry