Aluminum diboride (AlB2) is characterized by high theoretical combustion heat, high melting point, good chemical stability and good aluminum grain refining effect, which makes it show good application potential in many fields. AlB2 can be used as particle enhancer to improve the wear resistance of alloy, hydrogen storage material, solid propellant additive, etc. At present, there are two main methods to prepare AlB2, which can be prepared by solid phase sintering of boron powder and aluminum powder directly, or by aluminum heat reaction of aluminum powder and boron oxide or borofluoride. However, the AlB2 powder prepared by these two methods has the problems of uneven particle size and shape, which leads to the decrease of the performance of AlB2 powder. It is necessary to have a method to prepare AlB2 powder with uniform size, which can effectively control the particle size and shape of AlB2 powder and ensure its good performance.
The technical problem to be solved in this application is to provide an aluminum diboride powder and its preparation method, which can control the particle size and shape of AlB2 powder and ensure its good performance. In order to solve the above problems, the invention discloses a preparation method of aluminum diboride powder, including: adding the precursor reaction raw materials into the solvent of the liquid phase, and getting the evenly mixed suspension through ultrasonic mixing; Wherein, the precursor reaction raw materials include boron powder and aluminum powder; The uniformly mixed suspension is frozen to set, and then the solvent is removed by vacuum freeze-drying technology to obtain the treated precursor reaction raw materials; The treated precursor reaction material is transferred into a quartz tube; The quartz tube is sealed; Aluminum diboride powder was prepared by sintering the sealed quartz tube in a tubular furnace.
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