Boron-containing pyrolant

Boron is one of the essential materials for obtaining high specific impulse of a ducted rocket However, the combustion efficiency of boron-containing gas-generating pyrolants is low due to incomplete combustion of the boron particles in the ramburner.[i3-i l Fig. 15.20 shows the combustion temperature ofa boron-containing pyrolant with and without boron combustion as a function of air-to-fuel ratio, 8. A typical boron-containing pyrolant is composed of mass fractions of boron particles b(0-30), ammonium perchlorate ap(0.40), and carboxy-terminated polybutadiene ctpb(0-30). If the boron particles burn completely in the ramburner, the maximum combustion temperature reaches 2310 K at 8 = 6.5 and v = Mach 2 p =... 

Fig. 15.20 Theoretical flame temperature versus air-to-fuel ratio of a boron-containing pyrolant with and without boron combustion.

Fig. n.15 Burning rate augmentation as a function of pressure for B-AP pyrolants containing different mass fractions of boron particles. 

Fig. 11.18 shows experimental results concerning the frichon sensihvity of mixtures of AP parhcles and catalysts.Iil The AP parhcles are trimodal mixtures with diameters of 200 pm (33%), 35 pm (33%), and 5 pm (34%). Catocene (C27H32pe2) and ferrocene (CjoHjoFe) are both liquid organic compounds with iron atoms in their molecular structures and carborane is a liquid compound that contains boron atoms.Ii] The physicochemical properhes of -hexyl carborane are shown in Table 11.7. These catalysts are used to increase the burning rate of AP pyrolants. 

Fig. 15.12 shows the burning rate characteristics of an AP composite pyrolant containing boron particles. The pyrolant is composed of j p(0A0),... 

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