Influences of solid content of slurry on the microstructure of CaO crucible prepared by slip casting

Abstract

CaO crucible was prepared from Ca(OH) 2 slurry via a slip-casting method in order to avoid hydration problem caused by free CaO during preparation process. The effect of solid content of Ca(OH) 2 slurry on microstructure of CaO crucible was investigated. It was found that the rheological property of the slurry was significantly improved when the solid content of the slurry within a certain range. The change of solid content of slurry affects the microstructure of the final products. When the solid content of the slurry was 71 wt%, the manufactured CaO crucible was of smallest mean pore size (2.58 μm) after 1600 • C heating treatment.The heated CaO sample was of lower apparent porosity (4.1%) and higher bulk density (2.93 g/cm 3 ). And the size distributions of most CaO grains are between 10 and 40 μm.

Preparation of a (Ca,Sr,Ba)ZrO3 Crucible by Slip Casting for the Vacuum Induction Melting of NiTi Alloy

“…Figure 5a illustrates the relationship between the solid content and the viscosity of the slurry. The viscosity of the slurry decreased with the shear rate increase, demonstrating a non-Newtonian shear-thinning property, as shown in Figure 5a [20]. It can be seen that the viscosity of S3 is higher than S1 and S2.…”

“…Slip casting is a technique that uses the water absorption of gypsum molds to inject the prepared slurry into the mold [19][20][21]. After the moisture has been absorbed, it forms a green body with a certain strength.…”