机械活化-还原扩散法制备Fe-TiC复合粉末的新工艺

New Technology of Producing Fe-TiC Compound Powder by Mechanical Activation-Reductive Diffusion Method

探索了一条低温、低成本合成Fe-TiC复合粉末的新途径。以钛铁矿和石墨为原料,采用机械活化-还原扩散法制备Fe-TiC复合材料,结果表明该方法是可行的。电子探针(EPMA)和X-线衍射分析(XRD)结果表明,球磨时间小于8h时,球磨的主要作用在于活化物料,粉末无明显反应,但初始物料在150V强度下球磨后经退火可得到金属Fe和TiC的复合粉末。动力学研究表明,还原反应表观活化能随球磨时间的延长而明显下降,但球磨一定时间(6h)后不再有显著变化。在本实验条件下确定出通过球磨对物料进行活化的最佳时间范围为4～6h。

In this paper, a new lower-temperature and lower-cost way is discussed to produce Fe-TiC compound powder. Fe-TiC compound powder is produced by the mechanical activation-reductive diffusion method with ilmenite and graphite as materials. First, the natural ilmenite is used to study the feasibility of this technology and then the artifical ilmenite is used to study the kinetics of the reductive reaction. The result shows that Fe-TiC powder can be produced by this new method of the mechanical activation-reductive diffusion; moreover, the particles were prominently diminished and activated after milling. The result through the analysis of EPMA and XRD shows that the main function of the milling is to activate the materials and there is no obvious reaction found when the milling time is less than 8 hours; however, the compound powder of Fe and TiC can be gained when the initial materials are under the power of 150V and after they are milled and annealed. The study of dynamics shows that the apparent activation energy of the reductive reaction is gradually decreased with the extending of milling time, but the decrease is not obvious after a certain milling time (6 hours). The optimal range of time, which is ascertained to activate the materials through milling under these experimental conditions, is between 4 and 6 hours.