Hafnium diboride-tantalum disilicide composite powder and preparation method thereof

The invention provides hafnium diboride-tantalum disilicide composite powder and a preparation method thereof, and belongs to the technical field of composite powder materials. The hafnium diboride-tantalum disilicide composite powder provided by the invention is in a molten eutectic state and comprises hafnium diboride and tantalum disilicide at mass ratio of (2-11): 1. Tantalum disilicide is used as a modification component of hafnium diboride. On one hand, a high-temperature oxidation product SiO2 of tantalum disilicide can be used as a good high-temperature sealing and filling phase to fill holes of a hafnium diboride coating. On the other hand, another high-temperature oxidation product Ta2O5 of tantalum disilicide can be subjected to a solid solution reaction with HfO2 to form HfTaOx, so that the crystal transformation of HfO2 is inhibited to a certain extent, and the high-temperature thermal stability of the powder is improved. Therefore, the hafnium diboride-tantalum disilicide composite powder provid