Spark Plasma Sintering of α/β Si3N4 Ceramics with MgO-Al2O3 and MgO-Y2O3 as Sintering Additives

作者：Yu, F. L.^*; Bai, Y.; Han, P. D.; Shi, Q. L.; Ni, S.; Wu, J. H.

来源：Journal of Materials Engineering and Performance, 2016, 25(12): 5220-5224.

DOI：10.1007/s11665-016-2372-1

• alpha/beta Si3N4 ceramics
• properties
• sintering additives
• spark plasma sintering

In the present work, the alpha/beta Si3N4 ceramics were fabricated by spark plasma sintering (SPS) at 1400-1500 A degrees C for 6 min with 3wt.%MgO + 5wt.%Al2O3 and 3wt.%MgO + 5wt.%Y2O3 as sintering additives. The results showed that the phase composition, microstructure and mechanical properties of alpha/beta Si3N4 ceramics were highly dependent on the type of sintering additive. The incomplete phase transformation from alpha to beta occurred in the presence of an oxynitride (Mg-Al(Y)-Si-O-N) liquid phase. Compared with MgO-Al2O3, MgO-Y2O3 can significantly improve the beta conversion rate of as-sintered alpha/beta Si3N4 ceramics. And the as-sintered ceramics using MgO + Al2O3 as sintering additives had higher mechanical properties.

• 出版日期2016-12
• 单位西安交通大学; 盐城工学院