Abstract
Microelectromechanical system (MEMS) fuzes are an important development for detonator miniaturization, leading to devices often used as input for an explosive train. The output capability of a microdetonator is strongly influenced by detonation growth of the primary explosive. In this article, research made use of a manganin piezoresistance measuring method to investigate the detonation growth properties of charges of lead azide (Pb(N3)2) at micrometer diameters and density of 80% theoretical mean density (TMD). The samples developed for this research were cylindrical charges of lead azide contained in stainless steel capsules 0.9 mm in diameter and 3 mm in height. An electrical igniter was applied to ignite the charges. The fitting curve for detonation pressure versus height of the explosive charge was obtained, revealing that the critical height of the detonation growth in the microcharge was 1.8 mm, and the detonation growth was stable at the height of the charge at 2.4 mm. The maximum detonation pressure achieved was 6.0 GPa.
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