Effect of TiO2 crystal forms on TiB2 powder prepared by microwave heating
To explore the effect of TiO2 crystal forms(anatase and rutile)on the microwave heating pre-pared 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,mi-crostructure,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 reac-tion at 1 450 ℃ for 20 min.Among them,the TiB2 powder prepared from rutile TiO2 exhibits a regular hexa-gonal 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.
万方数据
