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利用机械合金化-真空退火法制备出铁硅金属间化合物,通过扫描电镜和X射线衍射研究了磨球直径、球磨时间和退火工艺对铁、硅混合粉末结构变化的影响,通过空气急冷法测试铁硅金属间化合物试样的抗热震性,并估算了铁硅金属间化合物形成的热力学条件。结果表明:Fe、Si单质在转速为225 r/min、球料比为10∶1、不锈钢球直径分别为6mm、10 mm、球磨时间分别为10 h、20 h、30 h的球磨条件下,均未发生机械合金化;利用950℃×2 h的退火工艺处理Fe、Si质量配比为1∶1、不同钢球直径球磨30 h的混合粉末,可以生成以Fe Si2为主的金属间化合物。
Ferrosilicon intermetallic compounds were prepared by mechanical alloying and vacuum annealing. The effects of grinding ball diameter, milling time and annealing process on the structural changes of iron and silicon mixed powders were studied by scanning electron microscopy and X-ray diffraction. Fe-Si intermetallic samples of the thermal shock resistance, and estimates of iron-silicon intermetallic compounds formed thermodynamic conditions. The results show that under the conditions of ball milling with Fe, Si simple substance at a speed of 225 r / min, a ball / material ratio of 10: 1, a diameter of stainless steel balls of 6 mm and a length of 10 mm respectively, milling time of 10 h, 20 h and 30 h, respectively, No mechanical alloying took place. The FeSi2-based intermetallic compound (FeSi2) -based intermetallic compound was produced by annealing at 950 ℃ for 2 h, and the mass ratio of Fe and Si was 1: 1. .