Fabrication and properties of diatomite ceramics with hierarchical pores based on direct stereolithography. Issue 5 (1st March 2022)

• Record Type: Journal Article
• Authors: Li, Shijia; Bao, Chonggao; Ma, Haiqiang; Dong, Wencai; Song, Suocheng; Wang, Qing; Liu, Rongzhen; Wu, Peiyao
• Is Part Of: Ceramics international. Volume 48:Issue 5(2022)
• Page Start: 6266
• Page End: 6276
• Publication Date: 2022-03-01
• Subjects: Porous diatomite ceramic -- Stereolithography -- Solid loading -- Rheological behavior -- Sintering; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.11.169
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Porous diatomite ceramics with hierarchical pores and high apparent porosity (50.29–56%) were successfully fabricated via direct stereolithography. The pre-ball-milling time, dispersant type and dispersant concentration were systematically investigated to prepare diatomite pastes with high solid loading, low viscosity and a self-supporting effect. The results showed that a pre-ball-milling time of 24 h was more suitable to prepare diatomite pastes with high solid loading, and Span80 at 2 wt% was the optimal dispersant to obtain 40 vol% diatomite paste with a low viscosity and a self-supporting effect. To restrain the formation of defects, a heating rate as low as 0.2 °C/min was allowed to control the pyrolysis rate in the multistage debinding process. At sintering temperatures ranging from 900 °C to 1000 °C, porous diatomite ceramics exhibited a typical bimodal porosity, high apparent porosity and great flexural strength.