Influence of Al2O3 content on mechanical properties of silica-based ceramic cores prepared by stereolithography
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Abstract
Abstract Silica ceramic cores have played an important part in the manufacture of hollow blades due to their excellent chemical stability and moderate high-temperature mechanical properties. In this study, silica-based ceramics were prepared with Al 2 O 3 addition by stereolithography, and the influence of Al 2 O 3 content on mechanical properties of the silica-based ceramics was investigated. The Al 2 O 3 in silica-based ceramics can improve the mechanical properties by playing a role as a seed for the crystallization of fused silica into cristobalite. As a result, with the increase of Al 2 O 3 content, the linear shrinkage of the silica-based ceramics first decreased and then increased, while the room-temperature flexural strength and the high-temperature flexural strength first increased and then decreased. As the Al 2 O 3 content increased to 1.0 vol%, the linear shrinkage was reduced to 1.64% because of the blocked viscous flow caused by Al 2 O 3 . Meanwhile, the room-temperature flexural strength and the high-temperature flexural strength were improved to 20.38 and 21.43 MPa with 1.0 vol% Al 2 O 3 , respectively, due to the increased α-cristobalite and β-cristobalite content. Therefore, using the optimal content of Al 2 O 3 in silica-based ceramics can provide excellent mechanical properties, which are suitable for the application of ceramic cores in the manufacturing of hollow blades.
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OpenAlex topics: Additive Manufacturing and 3D Printing Technologies · Bone Tissue Engineering Materials · Innovations in Concrete and Construction Materials
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