浇铸型高能CMDB推进剂的力学性能

研究了硝化棉种类和含量、高氯酸铵粒径,以及双基球和黑索今含量等对复合改性双基(CMDB)推进剂力学性能的影响。结果表明,随着含氮量12.0%的NC的降低,CMDB推进剂20℃和50℃下的拉伸强度和延伸率均显著降低。在CMDB推进剂中添加适量含氮量13.0%的NC和12.6%的NC均有助于提高推进剂拉伸强度;含氮量13.0%的NC不利于改善推进剂的延伸率;而含氮量12.6%的NC有助于提高推进剂的低温延伸率,但对推进剂高温延伸率影响不显著。在CMDB推进剂中添加适量的双基球对提高推进剂的拉伸强度和延伸率均有利。AP的粒径对CMDB推进剂力学性能影响显著,小粒径的AP有利于提高推进剂的拉伸强度,而大粒径的AP有利于改善推进剂的延伸率。随着RDX取代AP量的逐渐增大,CMDB推进剂在高温和常温下的拉伸强度先增大后减小,而延伸率先增减小后增大。

Mechanical Properties of Casting High Energy Composite Modified Double-base Propellant

Effects of the varieties and contents of nitrocellulose(NC)ball,particle sizes of ammonium perchlorate(AP),contents of AP and RDX on the mechanical properties of casting high energy composite modified double-base (CMDB) propellant,were studied. Results show that,the tensile strength and elongation at +20 ℃ and +50 ℃ of the CMDB propellant decrease significantly with the decreasing of NC (12.0%N) content. Appropriate content of NC(13.0%N) and NC(12.6%N ) balls in CMDB propellant can enhance the tensile strength of CMDB propellant. But NC(13.0N%) ball is not helpful to the improvement of tensile elongation of the propellant,while NC(12.6%N) ball is beneficial to the improvement of the propellant elongation. At the same time,appropriate content of DB ball composed of NC(12.0%N) and NG in the propellant will improve the tensile strength and the elongation of the propellant. Particle sizes of AP have influences on the mechanical properties of the propellant. AP with smaller particle size is helpful to improve the tensile strength of the propellant, while AP with bigger granularity is conducive to the improvement of the propellant elongation. When RDX content in CMDB propellant increases gradually,the tensile strength of CMDB propellant at +20 ℃ and +50 ℃ firstly increases and then decreases,while the elongation at +20 ℃ and +50 ℃ firstly decreases and then increases.