Rheological Behavior of High Solid Content Propellant Substitutes in Extrusion Process Assisted with SC‑CO2

• 作者: 丁亚军 应三九 熊奥 阮建
• 来源期刊: 含能材料
• 学科: 工学
• 关键词: 高固含量发射药 超临界二氧化碳（SC‑CO2） 流变行为 分散混合性能
• 年，卷（期）: 2020,（6）
• 页码范围: 504-513
• 页数: 10页
• 分类号: TJ55
• 语种: 英文
• DOI: 10.11943/CJEM2019287

摘要

In order to solve the problem of high viscosity of high solid content propellants, supercritical carbon dioxide (SC‑CO2) has been used as a plasticizer to improve its rheological behavior. The in‑line viscosity of the CA/CaCO3 solution was measured by a slit die rheometer during the extrusion process assisted with SC‑CO2, and the Power law was used to describe the rheological behavior of CA/CaCO3 and CA/CaCO3/SC‑CO2 solutions. Polyflow was utilized to model the dispersive mixing properties of the CA/CaCO3/SC‑CO2 solutions. Results show that with the presence of SC‑CO2, the viscosity and pressure of the CA/CaCO3 solution decreases significantly.And the viscosity coefficient of the CA/CaCO3 solution at 50℃ decreases by 26.00%, while its non‑Newtonian index increases by approximately 16.67%. As the extrusion temperature increases, the viscosity of the CA/CaCO3/SC‑CO2 solution decreases, and its shear viscosity is less sensitive to temperature at higher shear rate. According to this simulation results, when the CA/CaCO3/SC‑CO2 solution is subjected to the maximum shear stress, the maximum probability density increases by 20.63% at 50 ℃, which confirms that SC‑CO2 improves the dispersion mixing properties of the CA/CaCO3 solution.