Si-particle-size dependence of Mg2Si powders directly produced by liquid–solid synthesis method
Si-particle-size dependence of Mg2Si powders directly produced by liquid–solid synthesis method
复制标题
液固合成法直接生产的 Mg2Si 粉末的 Si 粒度依赖性
DOI：
10.1016/j.jallcom.2015.07.291
复制
发表时间：
2016
影响因子：
6.2
通讯作者：
Y. Shinohara
中科院分区：
文献类型：
--
作者：
Y. Isoda;S. Tada;Naoki Shioda;Y. Shinohara
在Mg 2Si系统中化合物的合成和粉末加工难以实现。这些方法需要涉及熔化、粉碎、研磨和筛分的多步骤程序，以便从Mg和Si起始材料获得Mg 2Si粉末。这可能导致Mg的氧化和所获得的粉末被杂质污染。在这项研究中，我们开发了一种直接的技术，使用液-固反应合成Mg 2Si颗粒。在合成中使用各种粒度（20-38、38-53、53-75、75-106、106-150和150-250 μm）的Si粉末。通过XRD和EDX分析，将所得粉末鉴定为单相Mg 2Si。最佳热处理温度介于911 K和1218 K两个共晶温度之间。在1143 K热处理4 h后，粒径小于53 μm的Si粉没有生成Mg 2Si粉。而在973 K热处理10 h后，所有Si粉均生成Mg 2Si粉。Mg 2Si粉末颗粒大于起始Si颗粒;例如，尺寸为53-75 μm的Si颗粒产生尺寸范围为75 - 106 μm的Mg 2Si粉末。Mg 2Si粉末的产率达到约90%。
The synthesis and powder processing of compounds in an Mg2Si system are difficult to achieve. These processes require a multi-step procedure that involves melting, crushing, grinding, and sieving in order to obtain Mg2Si powders from the Mg and Si starting materials. This may lead to the oxidation of Mg and contamination of the obtained powders with impurities. In this study, we developed a direct technique for synthesizing Mg2Si particles using a liquid–solid reaction. Si powders of various particle sizes (20–38, 38–53, 53–75, 75–106, 106–150, and 150–250 μm) were employed in the synthesis. The resulting powders were identified as single phase of Mg2Si by both XRD and EDX analyses. The optimal heat treatment temperature was between the two eutectic temperatures, 911 K and 1218 K. After heat treatment at 1143 K for 4 h, Si powders with particle sizes of less than 53 μm did not yield Mg2Si powders. In contrast, after heat treatment at 973 K for 10 h, all the Si powders produced Mg2Si powders. The Mg2Si powder particles were larger than the starting Si particles; for example Si particles with sizes of 53–75 μm produced Mg2Si powders with sizes ranging from 75 to 106 μm. The yields of Mg2Si powder reached approximately 90%.