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Influence of processing route and SiO2 on sintering ability, CTE, and dielectric constant of β-Si4Al2O2N6

Published online by Cambridge University Press:  31 January 2011

Ibram Ganesh ,
N. Thiyagarajan ,
D.C. Jana ,
G. Sundararajan ,
S.M. Olhero  and
J.M.F. Ferreira
Ibram Ganesh
Affiliation:
Center for Advanced Ceramics, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad 500 005, A.P., India; and Department of Ceramics and Glass Engineering, Center for Research on Ceramics and Composites (CICECO), University of Aveiro, Aveiro P-3810193, Portugal
N. Thiyagarajan
Affiliation:
Center for Advanced Ceramics, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad 500 005, A.P., India
D.C. Jana
Affiliation:
Center for Advanced Ceramics, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad 500 005, A.P., India
G. Sundararajan
Affiliation:
Center for Advanced Ceramics, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad 500 005, A.P., India
S.M. Olhero
Affiliation:
Department of Ceramics and Glass Engineering, Center for Research on Ceramics and Composites (CICECO), University of Aveiro, Aveiro P-3810193, Portugal
J.M.F. Ferreira*
Affiliation:
Department of Ceramics and Glass Engineering, Center for Research on Ceramics and Composites (CICECO), University of Aveiro, Aveiro P-3810193, Portugal
*
a)Address all correspondence to this author. e-mail: jmf@ua.pt
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Abstract

Dense β-Si4Al2O2N6 and β-Si4Al2O2N6-0.5SiO2 ceramics were obtained from α-Si3N4, α-Al2O3, AlN, and Y2O3 upon sintering green bodies consolidated by aqueous gel casting. For comparison purposes, a β-Si4Al2O2N6 was also prepared by the conventional dry-powder processing route. In the case of gel-cast β-Si4Al2O2N6, the as-purchased AlN powder was treated with H3PO4 and Al(H2PO4)3 prior to use along with α-Si3N4, α-Al2O3, and Y2O3. The gel-cast β-Si4Al2O2N6 exhibited superior hardness (1423 ± 6 Hv), fracture toughness (3.95 ± 0.3 MPa⋅m1/2), and coefficient of thermal expansion (CTE) (3.798 × 10−6/°C between 30 and 1000 °C) in comparison to the ceramic consolidated by conventional dry pressing, which exhibited only 1317 ± 5 Hv, 3.30 ± 0.2 MPa⋅m1/2, and 3.532 × 10−6/°C between 30 and 700 °C. The in situ-generated ∼9 wt% SiO2 has considerably reduced the dielectric constant and CTE of β-Si4Al2O2N6 from 7.30 to 6.32 and from 3.798 × 10−6/°C to 3.519 × 10−6/°C, respectively. The loss tangent property of the investigated materials was little influenced by the variation of chemical composition and processing route.

Keywords

CastingCompositeDielectric properties
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 9 , September 2008 , pp. 2305 - 2311
Copyright
Copyright © Materials Research Society 2008

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