Utilization of Coating on Embedded Metal Wire in Solid Propellants

Using embedded metal wires in propellant grains is one of the methods used to increase the burning rate without changing the composition of the propellant، which is mostly used in the end burning grains. Although using embedded metal wires to increase the burning rate in propellants has some advantages، it includes some defects such as increasing of pressure exponent and temperature coefficient which cause higher dependency of burning rate on the pressure of combustion chamber. Coating metal wires is one of the ways to solve this problem and improve the performance of grains with embedded metal wires. Besides reducing pressure exponent and temperature coefficient، coating metal wires makes a strong bond between the propellant and metal wire. In this article، considering the coating composition، we discuss the mechanism of its influence on burning rate and other parameters such as pressure exponent.