Magnesium Aluminum Borides as Explosive Materials
Final rept. Jun 2010-Dec 2011
CERAMATEC INC SALT LAKE CITY UT
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The most common compounds formed from boron are boron carbide B4C and boron nitride BN, which are generally not considered borides but which are included here since they are commercially available as high-quality powders. Borides are generally considered as compounds combining one, or more, metals with boron. Strong covalent bonding allows many of these borides to have high melting or decomposition temperatures, such that they can be used in reducing environments. LaB6, for example, is used as a replacement for W in thermoionic emitters, such as the filaments for electron microscopes, due to its high melting point and low work function. BN is used as a crucible material in its hexagonal form and as a cutting tool in its cubic state. B4C is used as an armor material due to its low specific gravity. A comprehensive survey of borides was performed by Cutler1 based primarily on the earlier data of Samsonov and Vinitskii2 and is still the best literature source for the properties of borides. Other excellent reviews include the work of Lundstrom3 as well as information on ternary borides as discussed by Nowotny and Rogl4. Williams gives data on selected borides5. Borides are processed like other non-oxide ceramics, using methods well known in the literature6-11.
- Inorganic Chemistry
- Ammunition and Explosives