B-AP pyrolant

A mixture of B and AP particles formulates an energetic B-AP pyrolant. A small amount of polymeric material is added to serve as a binder of the B and AP parti-... 

B-AP pyrolants made with CTPB are cured with epoxy resin as in the case of conventional AP-CTPB composite propellants. The mixture ratio of large-sized AP particles (200 pm in diameter) and small-sized particles (20 pm in diameter) is 0.30/ 0.70. The mass fraction of boron is variously 0.010, 0.050, 0.075, or 0.150, and the diameter of the boron particles, d, is either 0.5 pm, 2.7 pm, or 9 pm. 

Fig. 11.12 shows a comparison of the burning rates of B-AP and Al-AP pyrolant-sas a function of pressure. In analogy to the B-AP pyrolants, the burning rates of the Al-AP pyrolants increase with increasing and with decreasing size of the alum-... 

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

Fig. 11.16 Burning rate augmentation as a function of the total surface area of the boron particles in B-AP pyrolants composed of boron particles of different sizes.

The adiabatic flame temperature, 7, is 2220 K at (0.0), i. e., without B or A1 particles. 7 remains relatively unchanged in the region of less than 0.05, but then rises to a maximum of 2260 K at b(0.15). On the other hand, when A1 is mixed with AP, 7 reaches a maximum of3000 K at Ai(flT8). The maximum flame temperature of a B-AP pyrolant is thus approximately 740 K lower than that of an Al-AP py-rolant.[i7]... 

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