粒度级配对CL-20基炸药油墨流变性能的影响

为了研究粒度级配对CL-20基炸药油墨流变性能的影响,制备了粒径分别为400nm和4μm的CL-20样品,以及7种不同粒度级配的CL-20基炸药油墨;采用博勒飞(CPS)流变仪对炸药油墨进行了黏度测试,得到了相应的流变数据,并计算出非牛顿指数、屈服值和触变指数。结果表明,炸药颗粒的粒度级配对炸药油墨的流变性能有着十分明显的影响;随着粒径为4μm的CL-20含量的增多,炸药油墨表观黏度出现先减小后增大的现象;同时,非牛顿指数出现先增大后减小的现象,屈服值和触变指数总体上呈现先减小后增大的现象;当炸药油墨中粒径分别为400nm和4μm的CL-20质量比为1∶2时,炸药油墨的非牛顿指数为最大值0.41,屈服值和触变指数均达到最小值,分别为26.73和8.74,表明在该粒度级配条件下,炸药油墨具有更好的流变性能。

Effect of Particle Size Gradation on Rheological Properties of CL-20 Based Explosive Ink

To study the effect of particle size gradation on the rheological properties of CL-20 based explosive ink,the CL-20 samples with diameters of 400nm and 4μm and seven kinds of CL-20 based explosive inks with different particle size gradations were prepared.The viscosity of the CL-20 based explosive inks were tested by Brookfield(CPS)rheometer and the corresponding rheological data was obtained.The non-Newtonian index,yield value and thixotropic index were calculated.The results show that the particle size gradation of explosives has a significant effect on the rheological properties of explosive inks.With the increase of CL-20(d50=4μm)content,the viscosity of explosive inks first decreases and then increases.At the same time,the non-Newtonian index first increases and then decreases,and the yield value and the thixotropic index also generally decrease first and then increase.When the mass ratio of CL-20 with particle sizes of 400μm and 4μm in the explosive ink is 1∶2,the maximum non-Newtonian index is 0.41;the yield value and the thixotropic index are both at the minimum(26.73 and 8.74,respectively),showing that under this particle size grading condition,the explosives inks have better rheological properties.