J. Mater. Sci. Technol. ›› 2022, Vol. 116: 161-168.DOI: 10.1016/j.jmst.2021.12.012

• Research Article • Previous Articles     Next Articles

Improved mechanical properties of SiC fiber reinforced silica-based ceramic cores fabricated by stereolithography

W. Zhenga,b, J.M. Wua,b,*(), S. Chena,b, K.B. Yua,b, J. Zhanga,b, Y.S. Shia,b   

  1. aState Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
    bEngineering Research Center of Ceramic Materials for Additive Manufacturing, Ministry of Education, Wuhan 430074, China
  • Received:2021-10-13 Revised:2021-12-06 Accepted:2021-12-06 Published:2022-01-30 Online:2022-07-26
  • Contact: J.M. Wu
  • About author:∗ E-mail address: jiaminwu@hust.edu.cn (J.M. Wu).

Abstract:

Silica-based ceramic cores have been widely used to fabricate aero-engine hollow blades due to their moderate high temperature mechanical properties and excellent leachability. In this study, silica-based ceramics with SiC fiber addition were prepared via stereolithography, and the influence of SiC fiber content on mechanical properties of the obtained silica-based ceramics was investigated. With the increase of SiC fiber content, linear shrinkage gradually decreased, while room temperature flexural strength and high temperature flexural strength first increased and then decreased. As SiC fiber content increased to 4.0 wt%, linear shrinkage was reduced to 0.62% resulting from the oxidation of SiC. Furthermore, room temperature flexural strength was improved from 11.79 MPa to 23.83 MPa and high temperature flexural strength was enhanced from 15.64 MPa to 34.62 MPa with 4.0 wt% SiC fiber addition due to the reinforcement of fibers and the enhanced β-cristobalite content, which meets the need of ceramic cores. Therefore, it demonstrates the capability of fabricating high-performance and high-precision silica-based ceramic cores reinforced by SiC fibers via stereolithography for rapid manufacturing of hollow blades.

Key words: Silica-based ceramic cores, Stereolithography, SiC fiber, Mechanical properties, Hollow blades