关键词: 复合推进剂;团聚硼粉+;流变性能+;工艺性能

Abstract: The effects of agglomerating boron powder methods,granularity of agglomerated boron powder,loading ratio of B and HTPB prepolymer on rheological property of B/HTPB mixture were investigated by HAAKE rheometer.Results show that the small LiF particles in LiF coated boron powder(B/F) enhance the physical absorption between LiF and HTPB prepolymer,which result in higher apparent viscidity of B/HTPB mixture than that of the untreated boron powder.The apparent viscidity and yield value of HTPB agglomerated boron powder(B/H and B/F/H)with HTPB mixtures are less than that of the untreated boron powder,and are fixedness with mixing time increasing.At the same loading mass,the viscosity coefficient K of small B/H with HTPB mixture is greater than that of larger particles,and the shear rate index n is less than that of large particles.When the mass ratio of B/HTPB is 55/45,the flow equation of two kinds of mixtures becomes a Herschel-Bulkley equation,and the yield value of large agglomerated boron powder is less than that of small particles.Therefore,the mixture of large agglomerated boron powder with HTPB has better rheological property than small particles.The slurry of fuel-rich propellant with large agglomerated boron powder in high solid loading has good process with the apparent viscidity less than 1 500 Pa·s and yield value less than 150 Pa.

Key words: Composite propellant;Agglomerated boron powder+;Rheological property+;Technological property