Spectroscopic Characterization of B/KNO₃ Diode-Laser Induced Combustion

Abstract

The combustion of a B/KNO3 pyrotechnic mixture was characterized by its chemiluminescence for the first time. The reaction was initiated by a continuous wave (cw) diode laser inside a novel multipurpose reaction cell, whose design and construction are described. As in the case of the extensively studied oxidation of boron by O2, the most intense luminescence, recorded in the 400-600 nm range, is assigned to BO2. Its appearance delay time (10(-2) to 10(-1) s) equals that measured for the pressure increase and is shortened as the laser power is increased. A band observed at 355 nm appears at longer delay times than the BO2 bands. The band, and some weaker ones, may be assigned to BO, although some bands expected for BO (based on reaction between B atoms and O2) are absent from the spectra. This observation is discussed in the text, and possible emission from BN is discussed. If the band is assigned to BO, the absence of known bands may be due to specific E-V resonance energy transfer. Possible oxidation mechanisms consistent with the different delay ignition times are discussed.

Laser Ignition of Various Pyrotechnic Mixtures – an Experimental Study

“…The experimental setup was described in detail elsewhere [6].Aschematic sketch of the system is depictedi n Figure 3.…”

“…In ap reviousw ork [6] an ovel experimentals etup used to characterizei gnition of ap yrotechnic pellet by laser was described. In that work only the ignition and combustion of B/KNO 3 was reported.…”

Dual-mode response behavior of a graphene oxide implanted energetic system under different thermal stimuli

“…GO was produced and used as an additive in boron/potassium nitrate mixtures (B/KNO 3 for short) which are used extensively as propellant igniters and gas generators. 23,24 Several different percentages of GO were appended to B/KNO 3 , and the thermal decomposition, critical ignition distance and pressure-time curves for each sample were used to analyse the changes achieved under diverse thermal stimuli.…”

Synthesis of h-BN by the Combustion of B/KNO3/Octogen Mixture under Nitrogen Atmosphere

“…Considering the vigorous combustion reaction between boron and potassium nitrate (KNO 3 ), high combustion heat is generated (∼7,000 kJ•g −1 ), so adding proper amount of KNO 3 promotes the subsequent reaction [15]. In addition, appropriate amount of KNO 3 can increase the yields of resultant as reactants [16].…”