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Journal of Materials Science

, Volume 54, Issue 7, pp 5224–5235 | Cite as

Fabrication and characterization of robust freeze-cast alumina scaffolds with dense ceramic walls and controllable pore sizes

  • Meng-Qi Sun
  • Ping ShenEmail author
  • Qi-Chuan Jiang
Ceramics
  • 221 Downloads

Abstract

Directionally aligned prismatic and lamellar porous alumina scaffolds with a high strength-to-density ratio were fabricated from submicron Al2O3 powders and a tiny quantity of nanoscale TiO2 sintering aids by freeze casting using TBA and water as solvents. Both freezing temperature (− 10 °C, − 50 °C, − 90 °C) and sintering temperature (1300 °C, 1350 °C, 1400 °C) were varied to adjust pore parameters while a low solid loading (15 vol%) was maintained to ensure high porosity. This paper describes and compares the microstructures, porosity, pore size, wall thickness and compressive behavior of the scaffolds with two typical pore morphologies (lamella and honeycomb), which help to identify their scope of application and to unveil the relationship between pore morphology and mechanical property to optimize the material performance. The failure modes of these two types of scaffolds under compression were simulated. The TBA-based 1 wt% TiO2-containing alumina scaffolds with dense ceramic walls that were freeze-cast at − 90 °C and sintered at 1400 °C exhibited a compressive strength of 160 MPa with a porosity of 59%, indicating lightweight and high-strength characteristics.

Notes

Acknowledgements

This work is supported by the National Natural Science Foundation of China (No. 51571099) and the Changbai Mountain Scholars Program of Jilin Province (No. 2015011).

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Key Laboratory of Automobile Materials (Ministry of Education), School of Materials Science and EngineeringJilin UniversityChangchunPeople’s Republic of China

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