Fabrication and properties of diatomite ceramics with hierarchical pores based on direct stereolithography |
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| Affiliation: | 1. School of Materials Science and Engineering, State Key Laboratory for Mechanical Behavior of Materials, Xi''an Jiaotong University, Xi''an, Shaanxi, 710049, China;2. Collaborative Innovation Center of High-end Manufacturing Equipment, Xi''an Jiaotong University, Xi''an, 710054, China;3. State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China |
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| 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. |
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| Keywords: | Porous diatomite ceramic Stereolithography Solid loading Rheological behavior Sintering |
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