Study On Thermal Stability Of Boron Fuel-rich Propellant

The21st century, has entered the era of hypersonic flight. The key to achievinghypersonic flight is an advanced propulsion system, the core technology is advancing fuel.Because boron has a high quality energy and volume energy, making it become ahigh-performance air-breathing solid rocket ramjet and scramjet-profile pursuit of fuel.This experiment adopts the German NETZSCH company produces the STA449F3typeSimultaneous Thermal Analysis, respectively in two kinds of Ar and O2test atmosphere, setthe temperature range in RT~1000℃, select5K/min,10K/min,15K/min,20K/min fourdifferent heating rate, uniform temperature heating samples, measured thermal decompositionof Boron fuel-rich propellant MCRI-B series of samples. TG-DSC curve is obtained by test,decomposition characteristics analysis, discuss the possible reaction process of thermaldecomposition of samples, and then evaluate its thermal stability.The results show that:(1) Under the test of argon atmosphere, three samples of thereaction progress is inconsistent. The reaction process of MCRI-B1is mainly of water ofcrystallization process before100℃, crystal transition process before and after500℃and thedecomposition process before and after900℃. The overall reaction progress of MCRI-B2showed the highest stability，before about500℃only a small amount of quality loss, after500℃began to appear crystal type transformation process, about900℃, the decompositionreaction began to appear; The reaction process of MCRI-B3primarily at about300℃hasobvious combustion process.(2) Under the test of oxygen atmosphere, three samples ofoxidation characteristics consistent performance, are stepwise oxidation.(3) The same sample,under the same test atmosphere, heating rate of speed impact the starting point of the TGcurve and the corresponding peak temperature of the DSC curve, the impact on the progressof the reaction is not obvious, remained the same.(4) Thermal stability of the overallevaluation of three samples: MCRI-B2sample is the best, MCRI-B3sample followed, MCRI-B1sample is unstable.