基于激光烧蚀微推进技术的GAP靶带致密性研究

Density of GAP Target Zone Based on Laser Ablation Micro Propulsion Technology

从用于激光烧蚀微推进技术靶带的药剂配方、涂覆厚度、固化温度等方面入手,研究了各因素对靶带固化速率以及致密性的影响。对比研究了甲苯二异氰酸酯(TDI)、六亚甲基二异氰酸酯(HDI)、异佛尔酮二异氰酸酯(IPDI)、异氰酸酯(N100)等固化剂对聚合物端羟基聚叠氮缩水甘油醚(GAP)的固化速率和固化效果。结果显示,IPDI固化效果最佳。通过激光扫描共聚焦显微镜和场发射扫描电子显微镜观测了样品的靶带表面气孔率,并确定了涂覆厚度为200μm、固化温度为40~50℃的最佳工艺条件,使靶带气孔率在符合激光微推进系统要求下达到最低。

Effects of the formulation,coating thickness and curing temperature on curing rate and density of target zone based on laser ablation micro propulsion technology w ee studied.Influences of curing agent including toluene diisocyanate(T D I),hexamethylene diisocyanate(H D I),isophorone diisocyanate(IP D I)and biuret triisocyanate(N 1 0 0)on curing rate and curing effect of polymer hydroxy terminated glycidyl azide polymer(GAP)were also compared.Results show that curing effect of IPDI is the best.Surface porosity of the target was observed by laser scanning confocal microscope and field emission scanning electron microscope.Coating thickness of 200^m and curing temperature of 40-50^were confirmed as the best process condition to achieve the smallest porosity of the target meeting the requirement of laser micro propulsion.