Science and Technology of Energetic Materials

Vol.61, No.1 (2000)

Research paper

The combustion mechanism of tungsten - potassium perchlorate - barium chromate delay powder
Hidetsugu Nakamura, Miyako Akiyoshi, and Yasutake Hara


Thermal analysis, analysis of the combustion residue and combustion characteristics measurement such as burning rate or temperature were carried out to clarify the combustion mechanism of a tungsten - potassium perchlorate - barium chromate delay powder. The results obtained are as follows.
The main reaction of the delay powder of tungsten - potassium perchlorate - barium chromate is the oxidation of tungsten by potassium perchlorate. Barium chromate acts as a burning rate modifier, and the smaller the content the larger is the burning rate.
Three types of delay compositions used in this study show characteristic burning behavior. A stoichiometric or a oxidizer - rich composition has a small linear burning rate, although it has a large heat of combustion. On the other hand, a tungsten - excess or fuel - rich composition with a small heat of combustion has a larger linear burning rate than the former, showing a small fractional oxidation of tungsten (below 10 %) contained in the delay powder. From these results, a surface combustion mechanism is proposed for the combustion mechanism of this delay powder.

> Full text (Open access*)

© Copyright 1999-2017 Japan Explosives Society. All right reserved.