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Lu, Nannan
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article
Netshape centrifugal gel-casting of high-temperature sialon ceramics
Abstract
Gel-casting of ceramics is a promising technique that can be used to manufacture complex structures in a netshape approach, with the density and mechanical properties of the green and sintered structures being strongly influenced by the composition of the gel formulation and the casting approach. In this study, a parametric study was performed to assess the influence of the gel formulation (solid loading and resin content), the casting approach (centrifugal casting versus gravity casting), and the sintering treatment on the microstructural and mechanical properties development in gel-cast sialon ceramics. Optimum levels of solid loading and resin content were identified for the gel formulation. The study showed that a significant improvement in the high temperature flexural strength (~1.5–2 folds) can be achieved by employing a centrifugal gel-casting approach, due to the reduction of the porosity caused by the entrapped gas that gets entrapped during the standard casting process.