三种典型熔铸载体及其悬浮液的流变特性

Rheological Properties of Three Typical Melt-cast Matrices and Their Suspensions

为了对比不同载体对熔铸炸药悬浮液流变特性的影响,使用Haake MarsⅢ流变仪对TNT、DNAN、DNP的HMX悬浮液的流变性能进行了测试,分析了载体种类、剪切速率、体系温度、固相颗粒含量、颗粒级配对悬浮液流变性能的影响。结果表明,3种载体在熔融态时均为牛顿流体,而其悬浮液均表现出剪切变稀的性质;当温度在95~110℃时,熔融态载体单质的黏度变化均不超过12%;相同温度条件下,载体及其悬浮液表观黏度大小关系为:DNP>TNT>DNAN;当奥克托今(HMX)大小颗粒粒径比约为7、体积比为2时,3种载体悬浮液的表观黏度均为最低;将相对黏度和相对固含量的关系用Krieger-Dougherty函数进行拟合,结果表明3种载体均能较好地适用该模型,待拟合指数与熔铸载体的黏度和剪切速率均呈负相关。

In order to compare the influence of different matrices on the rheological properties of melt-cast explosive suspension,the rheological properties of the matrices and their suspensions were measured by Haake MarsⅢrheometer.The effects of the matrix type,shear rate,system temperature,solid content and particle size on the rheological properties of the suspension were analyzed.The results show that all the three molten matrices are Newtonian fluids but their suspensions are of the properties of shear thinning.When the system temperature is between 95℃and 110℃,the variation of the viscosity for the molten matrices is less than 12%.Under the same temperature,the apparent viscosities of the matrices and their suspensions show as follows:DNP>TNT>DNAN.When the diameter ratio of cyclotetramethylenetetranitramine(HMX)particles is about 7 and the mass ratio is 2,the apparent viscosities of the three matrices suspensions are the lowest.The Krieger-Dougherty relation was used to match the relation between relative viscosity and relative solid content.The results indicate that the model is suitable for all three matrices,where the matching index is negatively correlated with shear rate and the viscosity of the matrices.