Effect of Solid Loading of Slurry on Properties of SiO2-based Ceramics Formed by Digital Light Processing

doi:10.3901/JME.2023.01.259

Abstract

Abstract: With the rapid development of aerospace industry, ceramic cores play an important role in the preparation of engine turbine blades. In this work, silica (SiO₂) powder and zirconium silicate (ZrSiO₄) powder are used as raw materials to prepare SiO₂-based ceramics by digital light processing (DLP), and the effects of solid loading of ceramic slurry on the microstructure and properties of SiO₂-based ceramics formed by DLP are mainly studied. With the increase of solid loading from 50 vol% to 65 vol%, the content of cristobalite formed by quartz glass transition in SiO₂-based ceramics gradually decreases, and the pores of sintered parts decrease significantly. The radial shrinkage of SiO₂-based ceramics decreases from 4.65% to 1.61%, and the axial shrinkage decreases from 8.35% to 4.17%; The bulk density and the flexural strength of SiO₂-based ceramics increase gradually, while the porosity decreases. Finally, the optimum solid loading of ceramic slurry is 65 vol%. Meanwhile, the porosity of SiO₂-based ceramics is 25.4% and the room-temperature flexural strength is 9.3 MPa, which meets the performance requirements of SiO₂-based ceramic core.

Key words: SiO₂, ceramic cores, digital light processing, solid loading, flexural strength

CLC Number:

TQ174

YU Kangbo, WU Jiamin, ZHENG Wen, CHEN Shuang, ZHANG Jie, LIU Heng, WEN Shifeng, YAN Chunze, SHI Yusheng. Effect of Solid Loading of Slurry on Properties of SiO₂-based Ceramics Formed by Digital Light Processing[J]. Journal of Mechanical Engineering, 2023, 59(1): 259-266.

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Effect of Solid Loading of Slurry on Properties of SiO₂-based Ceramics Formed by Digital Light Processing

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