碳纳米管(CNTs)对Al-CMDB推进剂燃烧性能及力学性能的影响

Effect of Carbon Nanotubes(CNTs)on Combustion Properties and Mechanical Properties of Al-CMDB Propellants

为了研究碳纳米管(CNTs)对含Al改性双基(Al?CMDB)推进剂燃烧性能和力学性能的影响,采用吸收?压延的方法制备了推进剂样品,用靶线法测试了推进剂的燃速,并计算了压强指数;测试了推进剂样品在高低常温时的拉伸强度及延伸率。通过扫描电镜、火焰照片、燃烧波、熄火表面形貌及元素分析和DSC分析了碳纳米管影响Al?CMDB推进剂燃烧性能的原因。结果表明,在Al?CMDB推进剂中加入0.7%碳纳米管在6～20 MPa可提高推进剂的燃速,其中6 MPa下燃速提高最多,为4.98 mm·s^(-1);6～20 MPa下压强指数从0.57降低为0.45。管径10～20 nm的碳纳米管能提高Al?CMDB推进剂高低常温的拉伸强度及延伸率。碳纳米管对推进剂的热分解峰温影响不明显,但可使推进剂分解放热量增加。

To investigate the effect of carbon nanotubes(CNTs)on the combustion properties and mechanical properties of Al-CMDB propellant,the propellant samples were prepared through an absorption-extrusion method.The burning rate of propellants was measured by target line method and the pressure exponent was calculated.The tensile strength and ductility of propellant sample were tested at high,low and normal temperature.The reason of how CNTs affected the combustion performance of Al-CMDB propellant was analyzed by scanning electron microscopy(SEM),flame photo,combustion wave,morphology and element analysis of quenching surface and DSC analysis.The results show that the burning rate of propellant in the range of 6-20 MPa can be increased by adding 0.7%CNTs in Al-CMDB propellant,of which the burning rate at 6 MPa is increased most,which is 4.98 mm·s-1,and the pressure exponent decreases from 0.57 to 0.45 at 6-20 MPa.CNTs with pipe diameter of 10-20 nm can enhance the tensile strength and ductility of Al-CMDB propellant at high,low and normal temperature.The effect of CNTs on the peak temperature of thermal decomposition of propellant is little but it can make the exothermic quantity of propellant decompo-sition increase.