Journal
CERAMICS INTERNATIONAL
Volume 46, Issue 9, Pages 12942-12947Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.02.063
Keywords
Mixed surfactants; High porosity; Silica foams; Compressive strength; Sound absorption
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Funding
- National Key R&D Program of China [2017YFB0406200, 2018YFF01013605]
- Natural Science Foundation of China [51902327]
- Youth Innovation Promotion Association CAS [2019254]
- Science Foundation for Youth Scholar of State Key Laboratory of High Performance Ceramics and Superfine Microstructures [SKL201701]
- State Key Laboratory of New Ceramic and Fine Processing Tsinghua University [KF201806]
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The highly porous silica ceramics were fabricated by direct foaming with mixed surfactants and the influence of silicon nitride addition and solid content on the microstructures and properties were investigated. The results showed that silicon nitride can impede the formation of cristobalite and facilitates the sintering of silica ceramics. When the addition of silicon nitride powders reached 15 wt%, the highest compressive strength of silica ceramic foams could be obtained. The porosity of silica ceramic foams was tailored in the range of 84.61%-91.35% by adjusting the solid content, and the compressive strength of the obtained ceramic foams ranged from 5.89 MPa to 0.94 MPa. Sound absorption characteristics of silica ceramics foams were investigated. With the porosity of ceramic foams increased from 84.61% to 91.35%, the sound absorption coefficients in the entire sound wave frequency were enhanced due to the reduction of flow resistances, besides, the sound absorption peak varied from 4200 Hz to 2300 Hz, and became more intense and sharper.
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