angappan
Harmless
Posts: 2
Registered: 9-6-2008
Location: India
Member Is Offline
Mood: No Mood
|
|
sodium azide
Hi,
What will be reaction of Sodium azide with aluminium metal powder heating in a furnace to 1000 C? Any exposion would be possible?
S.Angappan
|
|
|
woelen
Super Administrator
Posts: 8014
Registered: 20-8-2005
Location: Netherlands
Member Is Offline
Mood: interested
|
|
Well before that temperature of 1000 C is reached, the sodium azide will have decomposed (possibly explosively). The Al and remaing Na might react,
making an alloy, but I'm not sure about that.
|
|
|
jokull
National Hazard
Posts: 506
Registered: 22-2-2006
Location: Everywhere
Member Is Offline
Mood: Ice glassed
|
|
This are some facts I know about sodium azide:
When heated from 275 to 330°C in dry air, the solid crystals decompose evolutioning nitrogen and a residue of sodium oxide. If air is humid then you
get sodium hydroxide.
Aluminum is also easy to oxidize, so I think you may find useful the phase diagram for full system including sodium, aluminum and their oxides.
Here you are:
Attachment: Al-Na phase diagram.wmf (4kB)
This file has been downloaded 723 times
|
|
|
Sauron
International Hazard
Posts: 5351
Registered: 22-12-2006
Location: Barad-Dur, Mordor
Member Is Offline
Mood: metastable
|
|
And suppose the thermal decomposition of NaN3 is conducted in an inert atmosphere or in a vacuum, absent moisture?
2 NaN3 -> 2 Na + 3 N2
The vacuum would be preferable, as the reaction might tend to reverse if N2 is allowed to linger.
Not a very economical way to make sodium is it?
The Na will be liquid, I am not sure what its vapor pressure is.
Sic gorgeamus a los subjectatus nunc.
|
|
|
Formatik
National Hazard
Posts: 927
Registered: 25-3-2008
Member Is Offline
Mood: equilibrium
|
|
Sodium azide explodes when heated to a high temeprature, so you can get an explosion.
|
|
|
angappan
Harmless
Posts: 2
Registered: 9-6-2008
Location: India
Member Is Offline
Mood: No Mood
|
|
Dear,
My aim is to prepare aluminium nitride, by aluminium metal powder and sodium azide with or without nitrogen gas? Kindly reply on this line.
|
|
|
Formatik
National Hazard
Posts: 927
Registered: 25-3-2008
Member Is Offline
Mood: equilibrium
|
|
Isn't this described in US Patent 7217403, European patent 691943, etc? But they also use a diluent (e.g. SiO2, ZrO2, etc). For patent images see espacenet or USPTO.
|
|
|
Sauron
International Hazard
Posts: 5351
Registered: 22-12-2006
Location: Barad-Dur, Mordor
Member Is Offline
Mood: metastable
|
|
How would you seperate the aluminum nitride from sodium even if the reaction proceeded peacefully?
You would get some sodium aluminum compound for sure.
Sic gorgeamus a los subjectatus nunc.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
