Design And Preparation/Performance On Two Types Of Carbon-based Igniter

With the miniaturization of the weapon system,the output energy of the electric initiating explosive device is reduced,and the antistatic ability is weakened,resulting in a decrease in reliability and safety.It is of great significance to develop new energy-converting materials that take into account the safety and reliability of pyrotechnics.In this paper,carbon materials are used as research objects.The electric firework products with carbon film as the energy-converting element and the"bridge-explosives"integrated igniter are designed and fabricated.The performance and mechanism are systematically studied.(1)The feasibility analysis of carbon material as a transducer element was carried out from the perspective of material properties.The ANSYS Thermal-Electric module was used to simulate the pulse action of the carbon bridge bridge region and compared with SCB.The effects of carbon film transducers with different thickness,resistivity and thermal conductivity on the pyrolysis process were investigated.(2)The carbon film transducer was prepared by high temperature pyrolysis,spray coating and atmospheric pressure chemical vapor deposition.The carbon film prepared by using the hexane as the carbon source was flat and dense,with strong adhesion to the substrate,and the resistivity was moderate.It is adjustable and has the potential to be a transducer element for electric firework.The effects of deposition temperature,deposition time,carrier gas flow rate and carbon source temperature on carbon film structure and electrical resistivity in Atmospheric Pressure Chemical Vapor Deposition(APCVD)were investigated.The relationship between the parameters such as I_D/I_G and sp² content of carbon film and resistivity was established by multiple linear regression fitting and partial least squares regression fitting.(3)The ignition characteristics,safety and reliability of the carbon film bridge were studied.Due to the high phase transition temperature of the carbon film,the phase transition temperature of the transducer material was longer during the ignition process,thus the reliability of the carbon film bridge ignition is better,and the conventional bridge can not be lit.The agent,for example the Na N₃ and n-Al/Cu SO₄·5H₂O.(4)The process of carbon film bridge function were illustrated and illuminated.The effects of capacitance,discharge voltage and agent on the discharge process of carbon film bridge were studied.The results show that the carbon film bridge exhibits different discharge characteristics under the action of small energy and large energy.With lower energy input,the carbon film bridge exhibits electrical resistance characteristics and is an electrothermal mechanism.Under the action of large energy,the carbon film bridge current curve will have a secondary peak,indicating that the carbon film is vaporized and ionized,which is the electric explosion mechanism.In addition,the carbon film will be graphitized during the action process,and the degree of graphitization increases as the input energy increases.(5)The carbon fiber was functionalized and then self-assembly with n-Al/n-Bi₂O₃and finally integrated as igniters in this section.The self-assembly mechanism was studied.Zeta potential and XPS data proved that there was long-term static in the self-assembly process electricity and covalent bonds.The FCF/n-Al/n-Bi₂O₃ composite system containing 10%functionalized carbon fiber is used as the detonator primer.Due to its weak detonation ability,it is necessary to undermine the explosives under strong constraints.The FCF/n-Al/n-Bi₂O₃composite system is made into an ignition head,which can be ignited under pulse discharge conditions,and can reliably ignite and detonate the 8#industrial detonator.(6)A novel conductive composition was prepared by physically mixing carbon fiber with a primer,and its preparation process,sensitivity characteristics and ignition performance were significantly different from those of conventional conductive composition.The conductive drug is made into an ignition head.The effects of pressure,carbon fiber content,agent and electrode distance on the ignition characteristics of the igniter were studied.The addition of carbon fiber can effectively reduce the electrostatic sensitivity of the conductive agent and the ignition head,but at the same time increase the mechanical sensitivity.The mechanism of action of carbon fiber conductive composition was preliminarily speculated by infrared thermography and current-voltage curves.The carbon fiber conductive agent is applied to the 8#industrial detonator and the M100 single-angle detonator to ignite and detonate reliably.