Combustion Synthesis of MgSiN<sub>2</sub> Powder at Different Nitrogen Pressures
- 1 Institute of Water-Saving Agriculture in Arid Areas of China (IWSA), Yangling, China
- 2 College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, China
- 3 College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, China
- 4 College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, China
Abstract
MgSiN 2 powders have been synthesized by combustion synthesis (CS) using Mg and Si 3 N 4 as starting materials at different nitrogen pressures. The CSed powders were then sintered by spark plasma sintering (SPS) to obtain dense bulk MgSiN 2 product. Analysis of the CSed powder using X-ray diffraction (XRD) revealed single-phase MgSiN 2 was obtained by CS method. However, the CSed product can be divided into three distinct parts according to its color. Scanning electron microscopy (SEM) observation revealed the grain size and crystallinity decrease gradually from the center to the outer layer. Some small grains clustered together to form larger particles, and there were a large number of pores among the clusters. The grain size seemed increasing with the increase of nitrogen pressure. The bulk density of CS-SPSed MgSiN 2 was 3.11 g/cm 3 , Vickers hardness was 1673.1 kgf/mm 2 , and thermal diffusivity was 8.718E − 2 cm 2 /s.
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