CN116136380A - 基于Ti/Al烧蚀层的冲击片换能元及其制备方法 - Google Patents
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Abstract
本发明公开了一种基于Ti/Al烧蚀层的冲击片换能元及其制备方法。所述的冲击片换能元以由Ti薄膜和Al薄膜组成的Ti/Al为烧蚀层、Al2O3薄膜为绝热层、Al薄膜为飞片层,采用射频磁控溅射***进行制备。本发明的基于Ti/Al烧蚀层的冲击片换能元与现有冲击片换能元相比,冲击片速度、冲击应力、P2r值等输出性能参数与现有冲击片换能元相比提升明显,换能效率高、输出威力大、应用前景广。
Description
技术领域
本发明属于火工品换能元领域,涉及一种基于Ti/Al烧蚀层的冲击片换能元及其制备方法。
背景技术
激光冲击片起爆技术是目前最先进的起爆技术之一,相较于经典的电起爆技术,其从根本上解决了射频或静电等干扰电磁信号导致意外发火的问题。此外,激光冲击片起爆技术还具有高精度、瞬发性好等特点,起爆作用时间在微秒级,在多点同步起爆、***逻辑网格中有广阔的应用前景。基于上述特点,激光冲击片起爆技术满足现代武器***的作战需求,同时符合直列式起爆技术的要求,随着激光技术与薄膜制备技术的快速发展,该技术已成为研究热点。
最初的Al、Cu等单层冲击片换能元存在吸光系数和强度都偏低的问题,随着研究的深入,出现了Al/Al2O3/Al、Al/MgF2/Al等以烧蚀层/绝热层/飞片层为结构的复合冲击片换能元,一定程度上解决了飞片平面性和完整性的问题,但仍无法解决冲击片换能元换能效率低、输出威力小的问题。文献1(Zhang H,Wu L,Hu P,et al.Launch and impactcharacteristics of typical multi-layered flyers driven by ns-pulsed laser[J].Optics and Laser Technology,2019,120:105709.)制备了单层Al、三层Al/Al2O3/Al冲击片换能元,在61.89J·cm-2能量下测得的P2r值仅为150和450GPa2ns,表明制备的两种冲击片换能元换能效率低、无法实现有效输出。文献2(陈少杰.激光驱动复合飞片冲击起爆HNS-IV的规律和机理研究[D].南京:南京理工大学,2015.)制备的单层Al、三层Al/Al2O3/Al冲击片换能元100mJ激光能量的飞片速度分别为3000m/s和3500m/s,换能效率≯30%。
发明内容
本发明的目的在于提供一种换能效率高、输出威力大的基于Ti/Al烧蚀层的冲击片换能元及其制备方法。
实现本发明目的的技术解决方案为:
基于Ti/Al烧蚀层的冲击片换能元,为Ti/Al/Al2O3/Al复合结构,以由Ti薄膜和Al薄膜组成的Ti/Al为烧蚀层、Al2O3薄膜为绝热层、Al薄膜为飞片层。
优选地,Ti/Al烧蚀层由厚度为0.01~0.13μmTi薄膜和0.13~0.25μmAl薄膜组成,Al2O3绝热层厚度为0.25μm,Al飞片层厚度为4.5μm;更优选为,Ti/Al烧蚀层由厚度为0.13μmTi薄膜和0.13μmAl薄膜组成。
基于Ti/Al烧蚀层的冲击片换能元的制备方法,包括如下步骤:
(1)将洁净的铝、钛、氧化铝靶材及玻璃衬底,置于射频磁控溅射***中,待真空达到5×10-3Pa、温度达到200℃时,通入氩气流量为8SCCM,进行离子束预溅射,离子束预溅射的束流维持在60mA,偏置电流为90mA,预溅射时间5min,活化玻璃衬底,使其形成倒悬键;
(2)待本底真空达到4×10-3Pa、温度达到200℃时,在氩气流量30SCCM制备激光冲击片换能元,各靶材的溅射工艺如下表所示,制得Ti/Al/Al2O3/Al冲击片换能元,
本发明与现有技术相比,其显著优点在于:
(1)本发明的激光能量利用率显著提高,在激光能量≯100mJ下,换能效率最高达到42%,目前业内冲击片换能元换能效率普遍≯30%(如文献1,文献2所列),有明显提升。
(2)本发明的冲击片速度、冲击应力、P2r值等冲击片输出性能的关键参数与现有冲击片换能元相比提升明显,在激光能量≯100mJ下,冲击片速度最高达到4554m·s-1,冲击应力达到37.98GPa,P2r值达到5095.19GPa2ns,与单层Al冲击片换能元相比,P2r值最高提升约2.25倍;与业内常用的Al/Al2O3/Al冲击片换能元相比,P2r值最高提升1.88倍。
本发明制备的Ti/Al烧蚀层冲击片换能元与业内常用的冲击片性能对比表
附图说明
图1为Ti/Al/Al2O3/Al(2)冲击片换能元实物图;
图2为不同冲击片换能元的激光抗反射性能对比图;
图3为不同冲击片换能元的冲击片速度对比图;
图4为不同冲击片换能元的冲击片P2r值对比图;
图5为Al/Al2O3/Al、Ti/Al2O3/Al、Ti3C2/Al2O3/Al冲击片换能元的冲击片速度图;
图6为Al/Al2O3/Al、Ti/Al2O3/Al、Ti3C2/Al2O3/Al冲击片换能元的P2r值图。
图7为***起爆前后的对比图,其中(a)为起爆前三维模型图,1-固定装置,2-壳体A,3-加速膛,4-HNS-IV,5-冲击片换能元,6-药筒,7-壳体B;(b)为起爆后mCT扫描图;
具体实施方式
下面结合具体实施例和附图对本发明作进一步详细描述。
实施例1
步骤1:分别设计0.25μmAl薄膜做烧蚀层、0.25μmTi薄膜做烧蚀层、由0.01μmTi薄膜和0.25μmAl薄膜组成的Ti/Al烧蚀层、由0.13μmTi薄膜和0.13μmAl薄膜组成的Ti/Al烧蚀层,绝热层为0.25μm的Al2O3、飞片层为4.5μm的Al,分别记做Al/Al2O3/Al冲击片换能元、Ti/Al2O3/Al冲击片换能元、Ti/Al/Al2O3/Al(1)冲击片换能元、Ti/Al/Al2O3/Al(2)冲击片换能元。
步骤2:准备好铝、钛、氧化铝靶材及K9玻璃衬底,将K9玻璃衬底依次经过丙酮、无水乙醇、去离子水超声清洗30分钟,将上述的靶材及K9玻璃衬底置入射频磁控溅射***;
待真空达到5×10-3Pa、温度达到200℃时,通入氩气流量为8SCCM,进行离子束预溅射,离子束预溅射的束流维持在60mA左右,偏置电流为90mA,预溅射时间5min,活化K9玻璃衬底,使其形成倒悬键。
待本底真空4×10-3Pa、温度达到200℃时,在氩气流量30SCCM制备激光冲击片换能元,各靶材的溅射工艺如下表1所示,分别制得不同薄膜组成的烧蚀层构建的冲击片换能元。
表1各靶材的磁控溅射工艺
图1为Ti/Al/Al2O3/Al(2)冲击片换能元的实物图。
采用光谱仪测试***、光子多普勒测试***、一维非均相***临界起爆判据对上述冲击片性能进行评价,结果如图2-4所示。在激光能量≯100mJ内,Al/Al2O3/Al冲击片速度最高为3217m·s-1,冲击应力最高为25.28GPa,P2r值最高为1732.09GPa2ns;Ti/Al2O3/Al冲击片速度最高为4089m·s-1,冲击应力最高为32.25GPa,P2r值最高为3177.81GPa2ns,优于传统的Al/Al2O3/Al冲击片;在激光辐照达到92.7mJ时,Ti3C2/Al2O3/Al冲击片速度最高为3842m·s-1,冲击应力最高为29.08GPa,P2r值最高为2462.40GPa2ns,优于传统的Al/Al2O3/Al冲击片。Ti/Al/Al2O3/Al(1)冲击片换能元在1064nm的激光吸收率为37.4%,冲击片速度最高达到4135m·s-1,冲击应力最高为33.26GPa,P2r达到3330.81GPa2ns;Ti/Al/Al2O3/Al(2)冲击片换能元在1064nm的激光吸收率63.5%,达到纯Ti烧蚀层的92.4%,冲击片速度最高达到4554m·s-1,冲击应力最高为37.98GPa,P2r达到5095.19GPa2ns,相较于Ti/Al2O3/Al冲击片换能元体系分别提升约12.9%、28.7%、70.0%,Ti/Al/Al2O3/Al(2)冲击片换能元的输出性能为四种冲击片换能元中最优,在换能效率、输出威力上优于Ti/Al2O3/Al、Al/Al2O3/Al等传统冲击片换能元。
表2三种冲击片换能元的性能数据
上述三种换能元在不同能量下的冲击片最终速度与P2r值如图5-6所示,在10-100mJ下,上述三种换能元在冲击片速度、P2r值等影响冲击片输出威力的关参数均弱于Ti/Al/Al2O3/Al(2)冲击片换能元。
图7为采用Ti/Al/Al2O3/Al(2)冲击片换能元成功发火前后的***对比图,***壳体A进光口出现明显扩孔效应,进光口由2mm锥形孔扩散至4.5mm通孔,冲击片换能元、加速膛、壳体B等组件被完全炸碎,证实本发明制备的高换能效率的冲击片换能元可以成功引爆HNS-IV,并实现了有效输出,可以用于激光冲击片火工品。
Claims (4)
1.基于Ti/Al烧蚀层的冲击片换能元,其特征在于,为Ti/Al/Al2O3/Al复合结构,以由Ti薄膜和Al薄膜组成的Ti/Al为烧蚀层、Al2O3薄膜为绝热层、Al薄膜为飞片层。
2.根据权利要求1所述的冲击片换能元,其特征在于,Ti/Al烧蚀层由厚度为0.01~0.13μmTi薄膜和0.13~0.25μmAl薄膜组成,Al2O3绝热层厚度为0.25μm,Al飞片层厚度为4.5μm。
3.根据权利要求1所述的冲击片换能元,其特征在于,Ti/Al烧蚀层由厚度为0.13μmTi薄膜和0.13μmAl薄膜组成。
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