Thermal Conductivity of Mullite/Al2O3 Ceramics Sintered with Li2O, CaO and Y2O3

You Fen Li; Qing Liu; Wei Wei Liu; Min Li

doi:10.4028/www.scientific.net/AMR.11-12.129

Paper Titles

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Enhancement of Electric Field inside Metallodielectric Metamaterial
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Hydrogen and Oxygen Chemical Potential Dependence of Electrical Conductivity of SrCe_0.95Yb_0.05O_3-x
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Thermal Conductivity of Mullite/Al₂O₃ Ceramics Sintered with Li₂O, CaO and Y₂O₃
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Preparation and Investigation on Magneto-Electric Effect of Cr₂O₃ Thin Films
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Hot Spot Oxygen Sensor Using GdBa₂ Cu₃O_7-δ-Based Composite Ceramics
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Electrical Conductivity of Barium-Doped α-Alumina
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 11-12Thermal Conductivity of Mullite/Al2O3 Ceramics...

Thermal Conductivity of Mullite/Al₂O₃ Ceramics Sintered with Li₂O, CaO and Y₂O₃

Abstract:

Dense Mullite/Al2O3 ceramics with a thermal conductivity of 45 W/m.K were obtained at the sintering temperature of 1500°C using Li2O, CaO and Y2O3 as additives. At temperature below 1500°C, the shrinkage of Mullite/Al2O3 ceramics is promoted by liquid LiAlSi2O6 and Al2Y4O9. Liquid LiAlSi2O6 mainly improves the densification of the sample when the sintering temperature increases to 1500°C. The formation of liquid phase at a relatively low temperature results in homogeneous Al2Y4O9 and Ca(Al2Si2O8) distributed around the Mullite/Al2O3 particles, which benefits the thermal conductivity improved.