CNTs mixed into W and B by ball-milling method and their application in delay composition

With the progress in science and technology, the dynamic security, the reliability, the accuracy and the stability of delay composition in complicated condition attracts more and more attentions. Traditional delay composition can not meet our requirements of the reliability and security. It's the first time carbon nanotubes (CNTs) with high heat conductivity and high intensity are added into the system of Tungsten type delay composition and boron type delay composition. CNTs were mixed into W and B by ball-milling method. Particle size analysis and transmission electron microscopy (TEM) are utilized to analyse the size structure and dispersity of W/ CNTs and B/ CNTs. Optimum conditions of preparing W/CNTs and B/CNTs were found to apply to fuel agent of delay composition. In addition, burning rate and delay precision of the four delay charges (BaCrO₄/W, BaCrO₄/W/CNTs,BaCrO₄/B and BaCrO₄/B/CNTs delay compositions)were reseached. Results show that delay compositions added to CNTs had higher burning rate and better delay precision than original delay charges (burning rate of BaCrO₄/W/CNTs was as much as 3-4 times higher than that of BaCrO₄/W under the same constraints. Meanwhile, burning rate of BaCrO₄/B/CNTs is 2 times higher than that of BaCrO₄/B). Especially, the ignition reliability of charges added to CNTs were improved while charge density exceeds about 6000 Kg/m³. So the addition of certain amount of CNTs in the delay compositions can obviously increase the burning rate and the ignition reliability of delay compositions.