硼镁复合粉的特性及对富燃料推进剂燃速特性影响

Characteristics of B/Mg compounds and the effect on the burning rate properties for fuel-rich propellant

采用扫描电镜(SEM)、激光粒度分布仪、pH酸度计和X-射线荧光光谱仪等手段,分析了硼镁复合粉的物化特性,用HAAKE流变仪测试了硼镁复合粉与HTPB混合形成悬浮液的流变特性,并研究了含硼镁复合粉富燃料推进剂的燃烧性能。结果表明,硼镁复合粉的密度较无定形硼粉的稍有减小,其与水形成悬浊液的pH值显中性,与HTPB粘合剂形成悬浮液的屈服值和表观粘度较小,且随剪切速率的增加,悬浮液体系的表观粘度最终趋于平缓,含硼镁复合粉的富燃料推进剂在0.5～3 MPa的燃速压强指数较含硼富燃料推进剂的提高0.05,燃烧热值增加2.81%。

The physic-chemical characteristics of boron/magnesium （B/Mg） compounds were determined by SEM, particle size distribution apparatus, pH meter and X-radial fluorescent spectrograph. The rheological properties of B/HTPB slurry were evaluated by HAAKE rheometer. The combustion performance of fuel rich propellant with B/Mg compounds was investigated. The results show that the density of B/Mg compounds is lower than that of amorphous boron powder. The pH values of B/Mg compounds with aqueous suspension is neutral, the viscosity and yield stress of B/Mg compounds with HTPB mixture are less than those of the amor- phous boron powder, respectively. Meanwhile, the viscosity of the mixture of the slurry is decreased slowly with the increase of the shear rate. The pressure exponent of fuel-rich propellant can be increased by 0.05 in the pressure range of 0.5 - 3.0 MPa and the combustion heat can be increased by 2.81%.