Influence of Sintering Temperature on the Properties of Precise Casting Shell Prepared by Additive Manufacturing
Author of the article:MAO Jian;LIU Hongjunu;LI Yamin;SU Guoliang;HAN Long
Author's Workplace：School of Materials Science and Technology,Lanzhou University of Technology,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China
Key Words：precise casting shell sintering temperature extrusion of ceramic slurry additive manufacturing properties of shell material
Abstract：The precision cast shell material samples were prepared by the additive manufacturing process of ceramic slurry extrusion forming.The phase composition and fracture morphology of the sintered samples were studied by XRD and SEM,and the influence of sintering temperature on the properties of the molded shell material was compared.The results show that when the sintering temperature increase from 900℃to 1000℃,the bending strength of the molded shell material increase rapidly and is basically stable after it exceed 1000℃.With the increase of sintering temperature,the porosity decreases and shrinkage increases.The sintering temperature of the shell material determined is 1000℃,the bending strength of the sample is 7.31 MPa,the porosity is 43.6%,and the average shrinkage is 0.79%.The increase of strength of molded shell material after sintering is mainly due to the crystallization transformation of silicon-based binder and the increase of mullite phase.
