Optimization Of GAP Energetic Target Process And Its' Laser Micro-propulsion Performance Test

As the rapid development of micro and nano satellites technology,the precision requirement for micro-thruster is more strict.In order to study the technology of micro laser ablation propulsion,this article concentrate on optimizing the formula of the solid target band,and the densification of the target is improved.Moreover,the method of improving the propulsion performance of the target is explored by doping the target,which will lay the foundation for the future research.The primary conclusions are follows:In order to solve the problem of low density of the GAP energy target,the formula of the GAP energetic target was determined by selecting appropriate curing agent,curing catalyst,water inhibitor,etc.The final formula is:GAP/C/IPDI/DBTDL/TPB/Resorcinol =91.3/l/7/0.1/0.3/0.3(mass ratio).The coating process of the target tape was optimized.The result shows that the optimal coating temperature was 30-40? and the optimal coating thickness was 200?m.Two laser ablation micro thrust test models,transmission mode and reflection mode,were designed.The ablation laws of the two mode were studied by these two test models.Each test was conducted with a semiconductor laser,and the wavelength was 808 nm.In T mode,the laser power was controlled to 7W in a single pulse laser mode.The results show that when the pulse width is in the range of 5?50ms,the impulse increases with the increase of the pulse width,but the specific impulse,the impulse coupling coefficient and the thrust are all reduced with the increase of pulse width.In R mode,the pulse width of the laser was controlled to 50 ms in continuous laser mode.The results show that the excitation time decreases with the increase of the laser energy in the range of 1.5-3.5w,and the thrust increases with the increase of laser power energy.The effect of doping on the micro-propulsion performance of laser ablation was investigated in order to improve the performance of the energetic target band.The results show that C_m increases from 55.85uN·s/J to 251.40uN·s/J when the content of doping carbon is between 0.15%and 0.4%,C_m wouldn't change obviously from 0.4%to 2.0%,and when the content of dopant is over 2.0%,C_m slowly reduced.In addition,a higher impulse coupling coefficient can be obtained by doping a metal with a high atomic weight in a low concentration carbon-doped target band.