针对总厚度为4 mm的LF6合金双层靶和总厚度为2 mm的三层靶进行了直径为2 mm,速度分别为5.8和7.2 km/s的GCr15粒子撞击试验,并对双层靶进行了不同前靶厚度和靶间距的撞击试验.试验结果表明:与同样碰撞条件下半无限体靶上产生的破坏情况相比,多层靶被击穿的总厚度远小于半无限体靶上形成的弹坑深度.采用多层靶结构可显著提高材料的抗高速粒子撞击能力,并大大降低航天器抗高速粒子撞击的防护结构的重量.结构的层数越多,防护性能越好.在满足防高速粒子击穿的条件下,为减小航天器多层防护结构的体积,靶间距一般可取为粒子直径的25倍左右.
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