采用化学物质对无定形硼粉表面改性研究

Studies on the modified surface of amorphous boron powder by different chemical origins

为了减少无定形硼粉表面的B2O3、H3BO3等杂质,分别以甘露醇、TP、TA和NaOH溶液为原料,对无定形硼粉进行了表面改性研究,并对其性能进行了测试表征。结果表明,硼粉经不同化学物质的表面改性后,硼粉表面的B元素含量提高;B/H2O悬浊液的pH值增大;随着B/HTPB悬浮液混合时间的增加,B-1/HTPB悬浮液的表观粘度和屈服值增加较快,B-3和B-4与HTPB混合的悬浮液粘度增加缓慢,而B-2/HTPB悬浮液在剪切速率大于1.0 s-1后几乎不变,且表面改性硼粉的粒度分布均匀,粒径基本在d50=4.653μm左右。

In order to reduce the acidic impurity B2O3 and H3BO3 on the surface of amorphous boron powder,mannitol,TP,TA and sodium hydroxide（NaOH） in solution were used to modify the amorphous boron respectively and the properties of modified boron particles were characterized by different instruments.The results show that the mass content of boron element on the surface of boron particles is increased and the pH values of B/H2O solvents improved after surface modification,which indicates that the acid materials were neutralized effectively.The yield value and viscosity of B-1/HTPB are enhanced rapidly and the viscosity of B-3/HTPB and B-4/HTPB suspends increased slowly,whereas,the viscosity of B-2/HTPB mixture almost have no change corresponding to the mix time of B/HTPB suspends.The partical size distribution of surface modified boron powder is uniformity and the diameter is about d50=4.653 μm.