This investigation deals with the fundamental combustion characterisitics of
the consolidated mixtures of boron and sodium nitrate. The initial pressure was
varied from ca. 0.01 MPa to 5 MPa. The initial temperatures tested were 77 K(boiling
point of liquid nitrogen) and 293 K(room temperature). The burning rate, temperature
sensitivity, and heat of reaction were obtained and combustion products were identified.
The consolidated mixtures burned even at 77 K or at low pressure. The relationship
between burning rate and pressure under different initial temperatures
obeyed
Vieille's Law. The temperature sensitivities of the burning rate were in the
range of
1-3×10-3K-1, same as those of boron / potassium nitrate mixtures. The
burning rate increased as the concentration of boron increased up to 40 wt%.
The equilibrium. thermodynamic calculations of the tested mixtures were carried out
by means of STANJAN, modeling the situation in the calorimeter bomb.
Using this program, assuming constant volume, adiabatic flame temperature, heat
of reaction, and combustion products were estimated. The main combustion
products at 298 K were to be B, BN, B2O3, NaBO2, Na and N2.
From the results of X - ray diffraction analysis, B, BN, and NaBO2 were identified.
ホウ素 / 硝酸ナトリウム混合物の燃焼遮度を減圧下から加圧下において測定した。 初期温度は液俸窒素の沸点と室温とした。 燃焼遮度は圧力に依存しVieilleの法則に従った。 いずれの混合物も極低温においても室温と同様に燃焼し, 温度感度はホウ素 / 硝酸カリウム系のそれとほぼ同程度であった。 熱量計を用いて反応熱を求め, 固体燃焼生成物の同定をX線回折で行い, 熱量計の燃焼条件で行った化学平衡計算結果と比較し, 反応式を推定した。