Aluminium oxynitride

Aluminium oxynitride

chembox new
SystematicName = Aluminium oxynitride
Section1 = Chembox Identifiers
Abbreviations = AlON
Section2 = Chembox Properties
Formula = (AlN)x.(Al2O3)1-x, mole fraction 0.30 ≤ x ≤ 0.37
MolarMass =
Appearance = White or transparent solid
Density = 3.688 g/cm³
MeltingPt = ~2140 °C
BoilingPt = ? ( Al2O3~3000°C)
Solubility = insoluble
Section3 = Chembox Structure
CrystalStruct = cubic spinel
Coordination =
MolShape =

Aluminium oxynitride (AlON) is a transparent ceramic composed of aluminium, oxygen and nitrogen. It is marketed under the name ALON and described in US patent|4520116. The material remains solid up to 1200°C (2200°F), and is harder than glass. When formed and polished as a window, the material currently (2005) costs about US$10 to US$15 per square inch (~ US$20,000/m²).

It is currently the crucial outer layer of experimental transparent armor being considered by the US Air Force for the windows of armored vehicles. Other applications include semiconductors and retail fixtures.

Objects are usually formed from pressed, cast or molded powder. The formed objects are then densified by heating in an oven, and polished until transparent. The polishing substantially improves the armor's impact resistance. [ [http://www.af.mil/news/story.asp?id=123012131 Air Force testing new transparent armor] by Laura Lundin, "Air Force Link", October 17, 2005, retrieved June 25, 2008]

References

ee also

* Transparent alumina
* Nanophase aluminium
* Transparent aluminium

External links

* [http://www.surmet.com/docs/Product_sheet_ALON.pdf ALON product sheet] at Surmet (PDF)
* [http://www.surmet.com/alon.html ALON product page]
* [http://www.stormingmedia.us/35/3574/A357481.html Aluminum Oxynitride Spinel (ALON): A Review] (Storming Media)
* [http://www.prnewswire.com/cgi-bin/micro_stories.pl?ACCT=683194&TICK=RTN4&STORY=/www/story/07-25-2002/0001771721&EDATE=Jul+25,+2002 Raytheon and Surmet Corp. to Develop and Market New Aluminum Oxynitride (ALON(R))] [http://www.alunet.net/shownews.asp?ID=951&type=3 Products for Commercial, Defense and Homeland Security Applications] (PRnewswire.com/alunet.net) "Raytheon press release"


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