Preparation of submicron TiB2 powder using sucrose as carbon source
To explore the influence of the organic carbon source on the refining of TiB2 powder,TiB2 powder was prepared by borothermal/carbothermal reduction using TiO2,B4C and sucrose as raw materials,insu-lating at 1 150,1 250,1 350 and 1 450 ℃ for 30 min,respectively.The reaction mechanism of the TiO2-B4C-sucrose system,as well as the refining mechanism of TiB2 grains was initially explored.The results show that Ti2O3 and TiC are two important intermediate products during the borothermal/carbothermal reduction process,which are both generated by the direct reaction of TiO2 and C.Subsequently,TiB2 may be genera-ted with Ti2O3 or TiC as the titanium source reacting with B2O3 and C.In addition,the highly activated nano-carbon from sucrose pyrolysis has a pore structure,which can improve the reaction efficiency and suc-cessfully enable the preparation of submicron TiB2 powder with an average particle size of 0.35 μm under the condition of insulating at 1 450 ℃ for 30 min.
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