Microstructure and Properties of ZrO2-AlN Composite Ceramics by Microwave Sintering

doi:10.15541/jim20210150

Abstract

Abstract:

Zirconia (ZrO₂) ceramics have excellent mechanical properties, but its application is limited by ZrO₂-AlN low thermal conductivity (TC). Zirconia-aluminum nitride (AlN) composite ceramics ZrO₂-AlN with high TC were designed and successfully fabricated by microwave sintering. After optimization of preparation conditions, the reaction between two substances was inhibited and the dense composite (relative density>99%) was obtained. The microstructure evolution, thermal behavior and mechanical properties were investigated in detail. The room temperature thermal conductivity, thermal diffusion coefficient and thermal capacity of ZrO₂-AlN composites increase with AlN content increasing, reaching 41.3 W/(m·K), 15.2 mm²/s and 0.6 J/(g·K), respectively. Such ZrO₂-AlN composites with high thermal conductivity and improved thermal shock resistance have broad application prospects in the field of high temperature heat exchange materials of energy systems.

Key words: zirconia, aluminum nitride, composite ceramic, microwave sintering, thermal conductivity

CLC Number:

TQ174

MU Tinghai, XU Wentao, LING Junrong, DONG Tianwen, QIN Zixuan, ZHOU Youfu. Microstructure and Properties of ZrO₂-AlN Composite Ceramics by Microwave Sintering[J]. Journal of Inorganic Materials, 2021, 36(11): 1231-1236.

Figures/Tables 9

References 23

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Specimen	Composition
ZAN-0	100%ZrO₂
ZAN-1	95wt%ZrO₂+5wt%AlN
ZAN-2	90wt%ZrO₂+10wt%AlN
ZAN-3	85wt%ZrO₂+15wt%AlN
ZAN-4	80wt%ZrO₂+20wt%AlN

Specimen	Composition
ZAN-0	100%ZrO₂
ZAN-1	95wt%ZrO₂+5wt%AlN
ZAN-2	90wt%ZrO₂+10wt%AlN
ZAN-3	85wt%ZrO₂+15wt%AlN
ZAN-4	80wt%ZrO₂+20wt%AlN

Sample	Rotating speed/(r·min^-1)	Rotating time/h	Pressure/MPa	Relative density/%
1#	250	24	200	99.3
2#	250	12	200	98.5
3#	200	24	200	98.9
4#	250	24	100	98.1

Sample	Rotating speed/(r·min^-1)	Rotating time/h	Pressure/MPa	Relative density/%
1#	250	24	200	99.3
2#	250	12	200	98.5
3#	200	24	200	98.9
4#	250	24	100	98.1

Microstructure and Properties of ZrO₂-AlN Composite Ceramics by Microwave Sintering

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