钛铁矿（FeTiO3）粉末的氧化过程中的物相转变、微观形貌及其氧化机制

探讨钛铁矿氧化过程中的物相转化、形貌改变及其氧化机理。在700~800°C时，钛铁矿(FeTiO3)转变为赤铁矿(Fe2O3)和金红石(TiO2)，当温度高于900°C时，三价铁板钛矿开始形成。原始的钛铁矿粉末呈现顺磁性，但是经过中温(800~850°C)氧化后，氧化产物呈现弱铁磁性。同时，讨论钛铁矿的氧化机理。通过对微结构的观察，发现在中温氧化过程中颗粒表面出现大量微孔，其在氧化过程中能够强化氧的传质。

Phase transitions,micro-morphology and its oxidation mechanism in oxidation of ilmenite (FeTiO3) powder

Phase transitions, morphology changes, and oxidation mechanism of the ilmenite oxidation process were investigated. FeTiO₃ transforms to hematite and rutile when oxidation at 700–800 °C, and pseudobrookite is formed when the oxidation temperature reaches 900 °C. The initial ilmenite powder exhibits paramagnetism; however, after being oxidized at the intermediate temperature (800–850 °C), the oxidation product exhibits weak ferromagnetism. The oxidation mechanism was discussed. The microstructure observations show that a lot of micro-pores emerge on the surfaces of ilmenite particles at the intermediate temperature, which is deemed to be capable of enhancing the mass transfer of oxygen during oxidation.