关键词: 硼热/碳热还原法, 锐钛矿, 金红石型, TiB₂粉体, TiO₂晶型

Abstract: To explore the effect of TiO₂ crystal forms (anatase and rutile) on the microwave heating prepared TiB₂ powder,TiB₂ powder was rapidly prepared using anatase or rutile TiO₂ as the titanium source,B₄C as the boron source,and carbon black as the carbon source by the boro/carbothermal reduction method under the microwave heating condition.Effects of TiO₂ crystal forms on the phase composition,microstructure,and C and O impurity contents of the TiB₂ powder were investigated.The results show that by microwave heating,pure phase TiB₂ powder can be prepared from both forms of crystalline TiO₂ after reaction at 1 450 ℃ for 20 min.Among them,the TiB₂ powder prepared from rutile TiO₂ exhibits a regular hexagonal flake structure with perfect grain development.However,TiB₂ prepared from anatase TiO₂ has a nearly spherical structure.In comparison,rutile TiO₂ as boron source is more conducive to preparing TiB₂ powder with high purity and complete crystal form.

Key words: boro/carbothermal reduction method, anatase, rutile, TiB₂ powder, TiO₂ crystal