高纯硼粒子的包覆及其在高能富燃料推进剂中的应用(续完)

Coating of High Purity Boron Particle and Its Application in High Energy Fuel-Riched Propellants

3．3用高热值金属作包覆剂 3．3．1用金属钛作包覆剂 早在1984年M．K．King等人就研究了用金属Ti或Zr包覆硼粒子的工艺，他们还研究了这种包拨的硼粒子的点火性能。结果表明：只有当环境温度达到包覆金属的点火温度时，才会发生硼粒子的点火反应；外层金属的燃烧通过反应性气体的扩散过程及其在粒子表面碰撞来控制。

Boron is widely used in the high energy fuel-riched propellants for solid rocket ramjet engine due to its advantages such as high heat value and clean combustion products. Boron has the disadvantages such as lower ignition and combustion efficiency and inferior compatibility with binders, and so on. Coating boron particle is the most efficient method for solving said problems. The processes for coating boron particle by using boron carbide, lithium fluoride, fluoro resin, graphite fluoride, high heat value metals（such as Ti, Mg, AI, etc）, TD1/TMP, GAP, PBT, HTPB, AP/KP, KNO3, etc. as coating agents and its application status in fuel-riched propellants are introduced in detail. Action mechanisms of various coating agents are different, they have own characteristics.