Abstract: A projectile for the destruction of unexploded ordnance comprising a dart shell having a core region which contains a reactive composition comprised of a reactive metal and an oxidizer. The reactive metal is selected from the group consisting of titanium, aluminum, magnesium, lithium, beryllium, zirconium, thorium, uranium, hafnium, alloys thereof, hydrides thereof, and combinations thereof. The oxidizer is selected from the group consisting of lithium perchlorate, magnesium perchlorate, ammonium perchlorate, potassium perchlorate, chlorates, peroxides, and combinations thereof. In an alternative embodiment, the reactive composition is located on the outside of a center penetrating rod. Also included is a disposable apparatus for delivering a projectile to destroy unexploded ordnance. The apparatus is comprised of a block having a top and a bottom, the block comprised of a material selected from the group consisting of wood and polymeric resin.

Abstract: Magnetohydrodynamic devices using hot ionized gas as working fluid require channel refractories, insulators, and electrodes to be cooled at their reverse sides in order to carry away heat flux fast enough to keep obverse sides below melting point, since gas temperatures of roughly 2500.degree. C. exceed melting points of any available metals or ceramics. Common procedure of brazing ceramic to metal backing (which is more conveniently fastened in apparatus and cooled) creates only partially solvable problem of differential thermal expansion, or bad fit. Ceramic reverse is grooved with dovetailed or convergent slots against which brazing stock is placed for brazing to metal backing. During brazing, molten braze alloy enters grooves and forms mechanical lock which on test proves stronger than ceramic itself.