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[References: 12 tit.]

The high heat of combustion makes boron and metal borides attractive as a metal fuels additive in solid propellants and hybrid fuels. The formed liquid B[2]O[3] oxide layer on the boron particles during the combustion prevents complete combustion and results in a higher burning time of the particles. Aluminum borides are characterized by a high melting point and when heated in an oxidizing environment they are oxidized to form Al[2]O[3] and B[2]O[3] oxides. This study investigates the chemical activity of metal powders based on aluminum, boron and titanium, which can be used in highenergy materials as fuel additives. The paper presents TG-DSC data of Al, AlB[2], AlB[12], TiB[2] powders: the onset temperatures of oxidation and the intense oxidation temperatures of the powders, the conversion coefficient and the weight gain of the samples in the air temperature range of 400 - 1200 °C. The maximum oxidation rate were obtained for AlB[12] powder (0.0104 mg/s) in the temperature range of 774-860 °C.