关键词: 含铝推进剂;凝聚;铝粉;表面微凸起;金属燃烧

Abstract: Formula for describing the starting point of agglomerating depression of unspheroidal aluminium powder is given by Young-Laplace equation and differentiation of chemical potential. The smaller average radius of microconvexities of aluminium particle surface is, the lower agglomerating starting point. It is elucidated that the influence of microconvexities on agglomeration can not be neglected. Reaction mechanism between metal Al and NaOH solution is revealed by electrochemical microcell theorem. Local corrosion microcells are composed of aluminium particles and NaOH solution. The metal Al loses three electrons at the anode of microcell, so the process at the anode is an oxidation reaction. Because the structure and physical state in unspheroidal aluminium particles are less uniform than in spheroidal one, the number of microcells of unspheroidal aluminium particle surface is larger than of spheroidal one, and NaOH solution reacts more with unspheroidal aluminium powder than with spheroidal one.

Key words: Aluminized propellant;Agglomeration;Powdered aluminium;Surface microconvexities;Metal combustion