Electrification of Lead Azide Powders under Ambient Conditions
Abstract
The electrification of lead azide powders was studied under ambient conditions by means of a vibrating trough apparatus. The experimental variables were: particle size; trough material; sample size, sample feed rate, and external electric field. The charge measured for a given weight followed very closely a square root dependence on weight in the range of sample weights used, and an inverse first power dependence on particle size in the 40 to 80 micron range of particle diameters. The inverse dependence on particle size corresponds to a constant surface charge concentration for a given powder. Applied fields of a few hundred volts per cm could neutralize the effect of spontaneous charging. Differences between different logs or types of powder and between different metals were observed and are attributed in part to article shape factors. Reversals of charging sign were noted, usually associated with contact with stainless steel.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1971
- Accession Number
- AD0728129
Entities
People
- B. D. Pollock
- C. R. Westgate
- W. B. Zimny
Organizations
- Picatinny Arsenal