Formation of Magnesium Silicide by Mechanical Alloying
Source: Advanced Performance Materials, Volume 4, Number 3, July 1997 , pp. 275-283(9)
Abstract:Elemental Mg and Si powders were mechanically alloyed in a planetary ball mill. The formation of magnesium silicide as well as the formation of magnesium oxide and hydride in the milled powders was studied in detail by X-ray diffraction and scanning differential calorimetry. It was found that direct formation of the magnesium silicide, Mg_2Si, occurred after 10 hours of milling and the content of Mg_2Si increased with increasing the milling duration. The activation energy for the formation of Mg_2Si was calculated by the Kissinger approach to be 215 kJ/mol. Besides oxidizing and hydrizing of Mg by decomposed organic additives during mechanical alloying, an increased contamination of powders from steel and alumina milling tools with increasing milling duration was detected. A short milling duration followed by a thermal treatment was thus suggested to synthesize magnesium silicide.
Document Type: Regular Paper
Affiliations: 1: Gintic Institute of Manufacturing Technology, Nanyang Technological University, 71 Nanyang Drive, Singapore 638075 2: Department of Mechanical Production Engineering, The National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260
Publication date: July 1, 1997