IGNITION AND COMBUSTION OF Al PARTICLES CLAD BY Ni

摘要

Combustion of single nickel-clad aluminum particles suspended ("levitated") in different gas environments is investigated. Thermal explosion characteristics of samples compacted from such particles are also studied. It is shown that clad Al/Ni particles can burn not only in oxidizing (O_2, CO_2, air) but also in inert (Ar) atmospheres, solely owing to gasless metal-metal interaction. Ignition temperature (1050―240 K) of clad particles is much lower than for aluminum (～2000K). It is also shown that their combustion mechanisms depend on the nature of ambient atmosphere. Specifically, burning of such particles in air involves two stages, with inverse images of flame (bright core-dark flame and dark core-bright flame).