关键词: 针状海绵态铁粉, 热电池, 水热合成, 发热材料

Abstract: The influences of hydrothermal reaction conditions on the morphology of needle-like FeOOH precursor and its particle size were investigated. The appropriate needle-like FeOOH powder was prepared under the hydrothermal conditions of 90℃, 24 h, and molar ratio of FeCl3×6H2O to CO(NH2)2 1:(1.5~4.5). The reducing process has a great effect on the morphology of iron powder. The spongy needle-like iron powder can be prepared at 550℃ under CO reducing atmosphere for 1 h and then H2 for 4 h. Compared with common iron powder, due to its large specific surface area (15.8 m2/g), the ignition sensitivity of spongy needle-like iron powder is higher, its combustion rate faster and quantity of continuance heat greater. The lifetime of thermal batteries can be prolonged for 20% using the iron powder as heating flake, so the spongy needle-like iron powder is an excellent heating material for thermal batteries.

Key words: spongy needle-like iron powder, thermal battery, hydrothermal synthesis, heating material