期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 37, 期 8, 页码 2849-2856出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2017.03.017
关键词
Porous structure; Al(OH)(3); Synthetic amorphous silica; Co-continuous porosity; Mullite
资金
- Brazilian Research Foundation FAPESP [2010/19274-5]
- CNPq [470981/2011-3, 306036/2011-8]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [10/19274-5] Funding Source: FAPESP
Porous materials produced from sintered Al(OH)(3) show a potentially useful alpha-Al2O3-based coral-like co-continuous microstructure of high porosity (above 70%) and chemical resistance. However, due to the lack of efficient connections among the particles of the solid phase, their poor mechanical properties limit their use in biomechanical and thermo-mechanical applications, as scaffolds for bone tissue and hot air filters, respectively. In this study, authors improved these connections reinforcing the structure with a sintering aid (synthetic amorphous silica, SAS). Al(OH)3 particles (previously sintered at 1500 degrees C, 5 h) were imbibed with SAS particles, compacted and sintered at 1300 degrees C, which generated a coral-like mullite-based porous structure. The porosity levels of the material (47%) were similar to those of the initial green state (50%) and achieved high levels of mechanical properties (flexural strength of 50.29 MPa, elastic modulus of 26.00 GPa), with small linear thermal shrinkage (lower than 6% at 1500 degrees C). (C) 2017 Elsevier Ltd. All rights reserved.
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