In the present study, a processing technique for recycling investment casting ceramic shell waste was proposed to separate valuable refractory aggregate zircon sand. The microstructure and phase constituents of the sh...In the present study, a processing technique for recycling investment casting ceramic shell waste was proposed to separate valuable refractory aggregate zircon sand. The microstructure and phase constituents of the shell waste and separation process were investigated. The results show that the characteristics of microstructure and phase constituents of the shell waste can meet the conditions for preferential y separating zircon sand, and zircon sand can be separated by gravity separation on a shaking table. The separated zircon sand has good shape and high purity, and can be used for the production of castings and other applications.展开更多
The manuscript presents changes of macrostructure and microstructure of plate and shaft castings made of cobalt alloy MAR-M509. They have different values of geometric module M within the range of 0.91 -5.56 mm that h...The manuscript presents changes of macrostructure and microstructure of plate and shaft castings made of cobalt alloy MAR-M509. They have different values of geometric module M within the range of 0.91 -5.56 mm that have been created with multilayer ceramic shell moulds （MSC） of different initial temperatures of 200-1000 ℃ at the moment of pouring. It has been stated that decrease of initial temperature of MSC and value M causes increase in casting fine-granularity, distance reduction between dendrite branches λ2 and refinement of initial carbides in irregular ternary eutectic γ＋M23C6 ＋MC.展开更多
文摘In the present study, a processing technique for recycling investment casting ceramic shell waste was proposed to separate valuable refractory aggregate zircon sand. The microstructure and phase constituents of the shell waste and separation process were investigated. The results show that the characteristics of microstructure and phase constituents of the shell waste can meet the conditions for preferential y separating zircon sand, and zircon sand can be separated by gravity separation on a shaking table. The separated zircon sand has good shape and high purity, and can be used for the production of castings and other applications.
文摘The manuscript presents changes of macrostructure and microstructure of plate and shaft castings made of cobalt alloy MAR-M509. They have different values of geometric module M within the range of 0.91 -5.56 mm that have been created with multilayer ceramic shell moulds （MSC） of different initial temperatures of 200-1000 ℃ at the moment of pouring. It has been stated that decrease of initial temperature of MSC and value M causes increase in casting fine-granularity, distance reduction between dendrite branches λ2 and refinement of initial carbides in irregular ternary eutectic γ＋M23C6 ＋MC.
