Reaction Sintering of Mg₂Si Intermetallic Compound by Microwave Irradiation

Abstract

In order to reduce the oxidizing and volatilizing caused by Mg element in the traditional methods for synthesizing Mg2Si compounds, solid state phase reaction at low temperature was introduced by microwave field. XRD was used to characterize the powders. At the same time, the influences of parameters during the synthesis processing were discussed. The results suggest that the heating profile is also dependent on the initial green density and higher green density provides lower heating rate while power setting are fixed and the oxidation of Mg can be rest rained by changing microwave heating programs. It was found that high purity Mg2Si intermetallic compound can be obtained with excessive content of 8at% Mg from the stoichiometric Mg2Si, 853K and 30min

Microwave Heating of Nanocrystals for Rapid, Low-Aggregation Intermetallic Phase Transformations

“…Microwave heating is well-known as an efficient method to introduce large amounts of energy into materials. At the bulk scale, the use of microwaves to trigger phase transformations has been well studied. − At the nanoscale, microwaves have been used as a method of NC synthesis, ,,, or catalytic excitation, ,, but they have not yet been used to induce intermetallic phase transformations. Microwave irradiation at the nanoscale allows localized heat generation from the NCs rather than their environment. − Localized heating allows for a temperature difference between the NCs and their local support environment of nearly 100 °C. , …”