Synthesis and performance of Ca-α/β-SiAlON composites from tailings
来源期刊：International Journal of Minerals Metallurgy and Materials2014年第5期
论文作者：Hong-shun Hao Yang Yang Fang Lian Wen-yuan Gao Gui-shan Liu Zhi-qiang Hu
文章页码：515 - 522
摘 要：Ca-α/β-SiAlON composites were prepared using Ca-α/β-SiAlON powder synthesized from gold ore tailings,which contained abundant Si and Al elements as the major raw materials together with minor additives,through a pressure-less sintering method.The influences of sintering temperature on the phase composition and microstructure of the composites were analyzed.The scanning electron microscopy images of the composites show the interlacing of grains with elongated columnar,short columnar and plate-like morphologies.The composites sintered at 1520°C for 6 h have a flexural strength of 352 MPa,Vickers hardness of 11.2 GPa,and fracture toughness of 4.8 MPa·m1/2.The relative content of each phase in the products is I（Ca-α-SiAlON）:I（β-SiAlON）:I（Fe3Si）=23:74:3,where Ii stands for the diffraction peak intensity of phase i.
Hong-shun Hao1,2，Yang Yang1,2，Fang Lian3，Wen-yuan Gao1,2，Gui-shan Liu1,2，Zhi-qiang Hu1,2
1. Institute of New Energy Materials,Dalian Polytechnic University2. Liaoning Provincial Key Laboratory of New Materials and Material Modification,Dalian Polytechnic University3. School of Materials Science and Engineering,University of Science and Technology Beijing
摘 要：Ca-α/β-SiAlON composites were prepared using Ca-α/β-SiAlON powder synthesized from gold ore tailings,which contained abundant Si and Al elements as the major raw materials together with minor additives,through a pressure-less sintering method.The influences of sintering temperature on the phase composition and microstructure of the composites were analyzed.The scanning electron microscopy images of the composites show the interlacing of grains with elongated columnar,short columnar and plate-like morphologies.The composites sintered at 1520°C for 6 h have a flexural strength of 352 MPa,Vickers hardness of 11.2 GPa,and fracture toughness of 4.8 MPa·m1/2.The relative content of each phase in the products is I（Ca-α-SiAlON）:I（β-SiAlON）:I（Fe3Si）=23:74:3,where Ii stands for the diffraction peak intensity of phase i.
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