In-situ preparation of SiC reinforced Si3N4 ceramics aerogels by foam-gelcasting method
High strength SiC reinforced Si3N4 ceramics aerogels (SCSNCAs) were fabricated via foam-gelcasting and subsequent catalytic reaction, utilizing industrial Si and melamine as raw materials, a small amount of incidental Fe impurities in Si powder as the catalyst and cetyltrimethylammonium bromide (CTA...
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| Published in | Ceramics international Vol. 48; no. 1; pp. 1166 - 1172 |
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| Main Authors | , , , , , , , |
| Format | Journal Article |
| Language | English |
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Elsevier Ltd
01.01.2022
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| Abstract | High strength SiC reinforced Si3N4 ceramics aerogels (SCSNCAs) were fabricated via foam-gelcasting and subsequent catalytic reaction, utilizing industrial Si and melamine as raw materials, a small amount of incidental Fe impurities in Si powder as the catalyst and cetyltrimethylammonium bromide (CTAB, the amount of 0.075 wt%) as foaming agent. The effects of solid loading level and reaction temperature on phase composition, microstructure and mechanical properties of the as-prepared SCSNCAs were examined. The aerogels prepared at 1423 K using a slurry of solid loading level of 30 wt% (Si:melamine = 3:1, mass ratio) had porosity of 91.9%, having compressive and specific strength of 0.8 MPa and 3.8 MPa·cm3·g−1 exhibited the lowest thermal conductivity of 0.066 W/(m·K) at 473 K. Compared with the control sample (without melamine, i.e., Si3N4 aerogels without the formation of SiC), the specific strength of the SCSNCAs increased by about 10%, which was attributed to the additional reinforcement from SiC whiskers formed in the Si3N4 matrix of the aerogels. |
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| AbstractList | High strength SiC reinforced Si3N4 ceramics aerogels (SCSNCAs) were fabricated via foam-gelcasting and subsequent catalytic reaction, utilizing industrial Si and melamine as raw materials, a small amount of incidental Fe impurities in Si powder as the catalyst and cetyltrimethylammonium bromide (CTAB, the amount of 0.075 wt%) as foaming agent. The effects of solid loading level and reaction temperature on phase composition, microstructure and mechanical properties of the as-prepared SCSNCAs were examined. The aerogels prepared at 1423 K using a slurry of solid loading level of 30 wt% (Si:melamine = 3:1, mass ratio) had porosity of 91.9%, having compressive and specific strength of 0.8 MPa and 3.8 MPa·cm3·g−1 exhibited the lowest thermal conductivity of 0.066 W/(m·K) at 473 K. Compared with the control sample (without melamine, i.e., Si3N4 aerogels without the formation of SiC), the specific strength of the SCSNCAs increased by about 10%, which was attributed to the additional reinforcement from SiC whiskers formed in the Si3N4 matrix of the aerogels. |
| Author | Li, Guangqiang Liu, Xueyin Han, Lei Zhang, Haijun Li, Faliang Li, Xiaojian Zhang, Shaowei Jia, Quanli |
| Author_xml | – sequence: 1 givenname: Lei orcidid: 0000-0002-6900-227X surname: Han fullname: Han, Lei organization: The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China – sequence: 2 givenname: Xiaojian surname: Li fullname: Li, Xiaojian organization: The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China – sequence: 3 givenname: Faliang surname: Li fullname: Li, Faliang organization: The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China – sequence: 4 givenname: Haijun surname: Zhang fullname: Zhang, Haijun email: zhanghaijun@wust.edu.cn organization: The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China – sequence: 5 givenname: Xueyin surname: Liu fullname: Liu, Xueyin organization: College of Civil Engineering and Architecture, Quzhou University, Quzhou, 324000, China – sequence: 6 givenname: Guangqiang orcidid: 0000-0002-4471-7439 surname: Li fullname: Li, Guangqiang organization: The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China – sequence: 7 givenname: Quanli surname: Jia fullname: Jia, Quanli organization: Henan Key Laboratory of High Temperature Functional Ceramics, Zhengzhou University, Zhengzhou, 450052, China – sequence: 8 givenname: Shaowei surname: Zhang fullname: Zhang, Shaowei email: s.zhang@exeter.ac.uk organization: College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, EX4 4QF, UK |
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| Keywords | Low thermal conductivity Catalytic reaction SiC reinforced Si3N4 ceramics aerogels Foam-gelcasting |
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| Snippet | High strength SiC reinforced Si3N4 ceramics aerogels (SCSNCAs) were fabricated via foam-gelcasting and subsequent catalytic reaction, utilizing industrial Si... |
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| SubjectTerms | Catalytic reaction Foam-gelcasting Low thermal conductivity SiC reinforced Si3N4 ceramics aerogels |
| Title | In-situ preparation of SiC reinforced Si3N4 ceramics aerogels by foam-gelcasting method |
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