Preparation of β-Si6−zAlzOzN8−z (z = 1–3) by combustion synthesis

β-Si6−zAlzOzN8−z (z = 1, 2, and 3) powders were combustion synthesized under a low nitrogen pressure of 1 MPa. Si, Al and SiO2 were used as the starting materials, and β-SiAlON (z = 1) was added as diluent. The CSed powders then were sintered by spark plasma sintering at 1600 °C for 12 min. The products were analyzed by X-Ray Diffraction (XRD) and FE-SEM. The Vickers hardness was measured by a Vickers microhardness tester at room temperature. The purity of the CSed products reached above 86% for z = 1, 2, and 3. Pure and dense β-SiAlONs (z = 1, 2 and 3) were obtained by SPS of CSed powders without any sintering additives, and the relative densities reached greater than 98% in theoretical. The Vickers hardness showed decreasing with the increase of z value, and the data ranges between 14.7 and 17.6 GPa due to different z values.

[1]  T. Akiyama,et al.  Fabrication of dense β-SiAlON by a combination of combustion synthesis (CS) and spark plasma sintering (SPS) , 2010 .

[2]  T. Akiyama,et al.  Vickers hardness of β-SiAlON prepared by a combination of combustion synthesis and spark plasma sintering , 2010 .

[3]  Ru Yang,et al.  Fabrication of single crystalline β′-SiAlON nanowires , 2008 .

[4]  T. Akiyama,et al.  Effect of mechanically activated raw materials on β-sialon formation by combustion synthesis , 2007 .

[5]  R. Xie,et al.  Synthesis and Photoluminescence Properties of β-sialon : Eu2 + ( Si6 − z Al z O z N8 − z : Eu2 + ) A Promising Green Oxynitride Phosphor for White Light-Emitting Diodes , 2007 .

[6]  T. Akiyama,et al.  A new route to synthesize β-Si6- zAlzOzN8- z powders , 2007 .

[7]  T. Akiyama,et al.  Mechanically Activated Combustion Synthesis of β‐Si6−zAlzOzN8−z (z=1–4) , 2007 .

[8]  D. Dollimore,et al.  Mechanism of the formation of β–Sialon by self-propagating high-temperature synthesis , 1998 .

[9]  M. Nygren,et al.  Dense single-phase β-sialon ceramics by glass-encapsulated hot isostatic pressing , 1989 .

[10]  Z. A. Munir,et al.  Self-propagating exothermic reactions: the synthesis of high-temperature materials by combustion , 1989 .

[11]  K. Jack.  Sialons and related nitrogen ceramics , 1976 .

[12]  W. I. Wilson,et al.  Ceramics based on the Si-Al-O-N and Related Systems , 1972 .

[13]  Yoichi Oyama,et al.  Solid Solubility of Some Oxides in Si3N4 , 1971 .