The invention provides a high-activity submicron
boron carbide ceramic powder and a low-temperature in-situ preparation method thereof, and belongs to the field of preparation of
boron carbide powder.The preparation method comprises the following steps: proportioning
boric acid,
petroleum coke and a
rare earth oxide additive,
drying, carrying out high-energy ball milling, crushing, and dry-pressmolding, and carrying out low-temperature carbon thermal reduction in an ultralow-frequency
heating furnace to in-situ prepare the high-activity submicron
boron carbide ceramic powder. According to the method, preparation and crushing are integrated, submicron B4C powder can be directly prepared, and subsequent tedious crushing and purifying are not needed. The
rare earth oxide can reduce the carbon thermal reduction temperature, inhibit the growth of B4C grains and prevent the coarsening of grains. Meanwhile, due to the addition of the
rare earth oxide, a second phase for promoting subsequentB4C
ceramic sintering can be generated through an in-situ reaction, and the
sintering activity of the ceramic powder is greatly improved. Compared with the prior art, the method has the advantages oflow
reaction temperature, short reaction time, low cost, environment friendliness,
energy conservation, consumption reduction and the like, and the process is simple and feasible and can be suitablefor industrial large-scale popularization.