丁羟三组元推进剂的增材制造及性能研究

Study on Additive Manufacturing and Performance of HTPB Tripropellant

针对传统浇注成型与直写式3D打印对固体推进剂药浆工艺性能要求相冲突的问题,为实现小型药柱的3D打印,采用添加少量定型助剂(YJ)的方法对丁羟三组元推进剂配方进行改性,对改性前后推进剂的工艺性能、力学性能、燃烧性能和能量性能进行对比分析,并探究了YJ对推进剂性能的影响。结果表明,改性后的推进剂药浆具备可控挤出和室温堆积的流变特性;YJ的加入使得推进剂在20、70℃下的最大抗拉强度分别降低0.1和0.15 MPa,断裂伸长率分别增加了12.7%和9.9%,表明YJ对其力学性能影响显著;此外,实验及理论计算表明,YJ对推进剂的燃烧性能和能量性能影响甚微,燃速最大降低0.24 mm/s,能量变化幅度均在1%以内;表明定型助剂(YJ)的加入不仅使药浆满足3D打印要求,而且对原始推进剂的整体性能没有显著负面影响。

In order to address the conflict between traditional casting molding and direct writing 3D printing in terms of the process performance of solid propellant slurry,the HTPB propellant slurry was modified through the addition of a small amount of setting agent(YJ)to enable the 3D printing of small propellant grain.To examine the of YJ on the propellant′s properties,a comparison and analysis of the performance,mechanical performance,combustion performance,and performance of the propellant was conducted before and after modification.The results indicate that the modified propellant slurry exhibits controllable extrusion and room temperature accumulation.The addition of YJ decreases the maximum tensile strength of the propellants by 0.1 and 0.15 MPa at 20 and 70℃respectively,and the elongation at break increases by 12.7%and 9.9%respectively.This evidence demonstrates that YJ significantly affects the mechanical properties of the propellants.Furthermore,both experimental and theoretical calculations indicate that YJ has minimal impact on the combustion and energy performance of the propellant.The burning rate is reduced by a maximum of 0.24 mm/s,and the energy variation range is less than 1%.The addition of the setting agent(YJ)not only enables the slurry to meet the requirements for 3D printing but also has no significant the overall performance of the original propellant.