Synthesis and performance of Ca-α/β-SiAlON composites from tailings

作     者：Hong-shun Hao Yang Yang Fang Lian Wen-yuan Gao Gui-shan Liu Zhi-qiang Hu 

作者机构：Institute of New Energy MaterialsDalian Polytechnic University Liaoning Provincial Key Laboratory of New Materials and Material ModificationDalian Polytechnic University School of Materials Science and EngineeringUniversity of Science and Technology Beijing 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2014年第21卷第5期

页      面：515-522页

核心收录：

学科分类：081902[工学-矿物加工工程] 0819[工学-矿业工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：financially supported by the National Key Technologies R&D Program of China(No.2011BAB03B05) the S&T Program of Liaoning Provincial Education Department(No.L2011078) the S&T Program of the Ministry of Housing and Urban-Rural Development,China(No.2013-K4-8) 

主　　题：ceramic materials composite materials tailings mechanical properties microstructure sintering 

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 influ- ences of sintering temperature on the phase composition and mierostrueture of the composites were analyzed. The scanning electron micros- copy images of the composites show the interlacing of grains with elongated columnar, short columnar and plate-like morphologies. The composites sintered at 1520℃ 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-SiAION）：I（β-SiAlON）：I（Fe3Si） = 23：74：3, where Ii stands for the dif- fraction peak intensity of phase i.