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- Newsgroups: sci.space
- Path: sparky!uunet!think.com!spool.mu.edu!agate!rsoft!mindlink!a752
- From: Bruce_Dunn@mindlink.bc.ca (Bruce Dunn)
- Subject: Re: Aluminum as rocket fuel?
- Organization: MIND LINK! - British Columbia, Canada
- Date: Fri, 1 Jan 1993 00:49:01 GMT
- Message-ID: <19075@mindlink.bc.ca>
- Sender: news@deep.rsoft.bc.ca (Usenet)
- Lines: 25
-
- Regarding using nitrogen to pressurize molten aluminum
-
- > Henry Spencer writes:
- >
- > There's no significant amount of nitrogen on the Moon unless there are
- > frozen polar volatiles. You can recover a very little bit from the
- > regolith, if you're willing to process a lot of regolith.
- >
- > A note of caution: you're assuming that nitrogen is an inert gas. This
- > isn't necessarily true when hot metals are involved. I'm not sure about
- > aluminum, but I know titanium will burn fiercely in nitrogen (in fact,
- > the ash from titanium burning in air is about 80% titanium nitride).
- > Without an ignition source, the combination might be stable enough.
-
-
-
- Molten aluminum is stable enough in air which is 80% nitrogen.
- However, there may be some formation of protective oxide layers, and the
- pressures involved are nowhere near the pressures needed for rockets.
- Anyway, the point is probably moot if the pressurizing gas has to be imported
- from the earth - in this case helium would have a fraction of the mass and be
- a truly inert gas for use in pressurization.
-
- --
- Bruce Dunn Vancouver, Canada Bruce_Dunn@mindlink.bc.ca
-