Patent ID: 8709368

Claim:
A preparation process of transition metal boride, comprising the steps of: A) placing aluminum in a reactor, B) evacuating the reactor containing the aluminum; C) feeding inert gas into the reactor after the evacuation, D) heating the reactor to 700 to 800° C.; E) adding dry potassium fluoborate or sodium fluoborate to the reactor containing the inert gas and the aluminum, F) generating monomer boron and cryolite by rapid stirring and reaction for 4 to 6 hours, G) removing molten liquid at the upper layer so as to obtain the monomer boron by separation; and H) adding the obtained monomer boron with transition metal selected from chromium or vanadium for reaction at a temperature from 1800 to 2200° C. in order to generate corresponding chromium or vanadium boride.