AlH_(3)高能推进剂流变性能及可浇性判据

Rheological performance and castability criteria of AlH_(3) high energy propellant

利用真空喷淋浇注设备和流变学测试方法,研究了AlH_(3)高能推进剂药浆在适用期内的流变性能,探究药浆在不同浇注时间下的黏度、屈服值与可浇性之间的关系。实验结果表明,随着浇注时间的增加,药浆的黏度增大、剪切速率指数降低、假塑性增强。药浆的黏度随浇注时间的变化规律可以用经验公式η_(t)=η_(0)+at^(b)较为准确地描述。流变学本构方程Herschel-Bulkley可较为准确地描述药浆黏度、剪切速率、屈服值三者之间的关系。AlH_(3)高能推进剂可浇性判据:药浆黏度在355.7Pa·s以下、屈服值在82.3Pa以下、单位质量流平面积在0.823cm^(2)/g以上可浇注;黏度在491.4Pa·s以上、屈服值在117.6Pa以上、单位质量流平面积在0.739cm^(2)/g以下无法浇注。

The rheological performance of AlH_(3) high energy propellant slurry during the applicable period was investigated by using vacuum spray casting equipment and rheological testing methods,and the relationship among viscosity,yield value and castability of the slurry at different casting time was explored.The experimental results showed that the viscosity of the slurry increased,the shear rate index decreased,and the pseudo plasticity increased with the increase of casting time.The change rule of the slurry viscosity with the casting time could be described more accurately by the empirical formulaη_(t)=η_(0)+at^(b).The relationship among the slurry viscosity,shear rate and yield value could be more accurately described by the rheological constitutive equation Herschel-Bulkley.The criteria for castability of AlH_(3) high energy propellant were as follows:the slurry could be cast when the slurry viscosity was below 355.7Pa·s,the yield value was below 82.3Pa,and the leveling area per unit mass was above 0.823cm^(2)/g;the slurry could not be cast when the slurry viscosity was above 491.4Pa·s,the yield value was above 117.6Pa,and the leveling area per unit mass was below 0.739cm^(2)/g.