机械合金化对制备SiO_2-Al复合粉的影响

Effect of Mechanical Alloying on the Preparation of SiO_2-Al Composite Powders

本文研究了过程控制剂的添加量对SiO2-Al复合粉出粉率的影响及球磨时间对粉末的细化和固相反应温度的影响。应用激光粒度仪、扫描电镜、X射线衍射仪和差热分析仪对球磨后的复合粉进行分析。研究表明,经20h球磨时,过程控制剂的添加量为4%时,出粉率高达85%;随着球磨时间的延长,SiO2-Al复合粉被逐渐细化,20h球磨后,其中位径降至4.35μm,但是并没有发生固相反应;随着球磨时间的延长,降低了SiO2和Al的固相反应温度。

The impact of process control agent addition on the extraction rate and the milling time on the powders refinement,mechanical alloying and thermal stability of SiO2-Al composite powders were studied in this paper.The composite powders after milling were analyzed by laser particle size analyzer,scanning electron microscopy,X-ray diffraction and differential thermal analyzer.The result showed that by 20 h of milling,the extraction rate of composite powders was up to 85% with adding 4% of the process control agent.With the extension of milling time,SiO2-Al composite powders have been gradually refined,median diameter down to 4.35 μm after 20 h milling,but there is no reaction occurred.The temperature of reaction has been fallen with the extension of milling time.