Abstract Physicochemical changes occurring in an oxide shell of boron particles during heating are extremely important for the oxidation and combustion of boron, including those in solid propellant compositions. The Al 2 O 3 , MgO, MgF 2 , Al, and Mg impurities were experimentally discovered in an oxide layer on boron particles obtained by various methods. The goal of this work is to determine the effect of these impurities on the thermal behavior of boron oxide, with particular attention paid to evaporation of B 2 O 3 . The temperature and thermal effects of reactions between the components are thermoanalytically determined, and the processes of dehydration, melting, and evaporation of boron oxide are analyzed in detail. The enthalpy of evaporation of boron oxide, starting at a temperature above 1300°C is experimentally determined, and is equal to 347 ± 3 kJ/mol. An interaction is observed between magnesium fluoride and boron oxide at a temperature of about 1000°C with a mass loss corresponding to the content of magnesium fluoride and the formation of gas-phase boron fluoride. It is established that boron dissolved in oxide has virtually no effect on the evaporation of the boron oxide melt, while the addition of Al 2 O 3 or MgO significantly increases its thermal stability. Based on the analysis of the results obtained, an assumption is made about the effect of impurities on boron activity in the processes of boron ignition and combustion.

中文翻译：

---

使用硼粉作为燃料的前景。二、铝镁添加剂及其化合物对氧化硼热行为的影响

摘要 加热过程中硼颗粒氧化物壳中发生的物理化学变化对于硼的氧化和燃烧极其重要，包括固体推进剂组合物中的那些。Al 2 O 3 、MgO、MgF 2 、Al和Mg杂质是在通过各种方法获得的硼颗粒上的氧化物层中通过实验发现的。这项工作的目标是确定这些杂质对氧化硼热行为的影响，特别注意 B 2 O 3 的蒸发。热分析测定了组分间反应的温度和热效应，详细分析了氧化硼的脱水、熔化和蒸发过程。氧化硼的蒸发焓，从高于 1300°C 的温度开始是通过实验确定的，并且等于 347 ± 3 kJ/mol。在约 1000°C 的温度下观察到氟化镁和氧化硼之间的相互作用，质量损失对应于氟化镁的含量和气相氟化硼的形成。已确定溶解在氧化物中的硼对氧化硼熔体的蒸发几乎没有影响，而添加 Al 2 O 3 或 MgO 显着提高了其热稳定性。基于对所得结果的分析，假设在硼点火和燃烧过程中杂质对硼活性的影响。已确定溶解在氧化物中的硼对氧化硼熔体的蒸发几乎没有影响，而添加 Al 2 O 3 或 MgO 显着提高了其热稳定性。基于对所得结果的分析，假设在硼点火和燃烧过程中杂质对硼活性的影响。已确定溶解在氧化物中的硼对氧化硼熔体的蒸发几乎没有影响，而添加 Al 2 O 3 或 MgO 显着提高了其热稳定性。基于对所得结果的分析，假设在硼点火和燃烧过程中杂质对硼活性的影响。