粗AP形貌缺陷对丁羟推进剂燃烧和力学性能的影响

为了探索粗高氯酸铵(AP)晶体表面缺陷对丁羟推进剂(HTPB)燃烧和力学性能的影响,用扫描电镜(SEM)观察了40~60目(Ⅰ型)、100~140目(Ⅲ型)两种粗AP的晶体形貌,分析了粗AP形貌缺陷对HTPB推进剂燃速、压强指数以及力学性能的影响。结果表明,粗AP晶体形貌对HTPB推进剂低压强段(3~12MPa)的燃速和压强指数影响较小,对HTPB推进剂高压强段(12~20 MPa)燃速和压强指数影响显著。当粗AP晶体表面形貌存在缺陷时,高压强段燃速从11.27~13.93 mm·s~(-1)变化范围扩大到11.28~16.35 mm·s~(-1),其压强指数也从0.40提高至0.70。结果显示,粗AP形貌缺陷对HTPB推进剂力学性能影响较小。

Effect of Crystal Morphology of Ammonium Perchlorate on the Properties of HTPB Propellant

To explore the effect of crude ammonium perchlorate (AP) crystal′s surface defects on the combustion and mechanical properties of HTPB propellant, the crystal morphologys of two kinds of crude AP (40-60 m·sh (Ⅰ),100-140 m·sh (Ⅲ)) were observed by scanning electron microscope(SEM), and the effects of crude AP′s morphology defects on burning rate, pressure exponent and mechanical properties of HTPB propellant were studied.The results show that there is little effect of crude AP′s morphology defects on the burning rate and pressure exponent of HTPB propellant′s low-pressure section (3-12 MPa), whereas a noticeable effect on those of its high-pressure section (12-20 MPa).The burning rate of high-pressure section expands the scope from 11.27-13.93 mm·s-1 to 11.28-16.35 mm·s-1 and the pressure exponent also increases from 0.40 to 0.70 when the morphology defects appear on the surface of crude AP crystals.The results also show that crude AP′s morphology defects have little effect on the mechanical properties of HTPB propellant.