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Start Over Author "Zhao, D. L." Journal materials research innovations
4 results on '"Zhao, D. L."'

3. Effects of sintering aids on mechanical and dielectric properties of Si3N4 ceramics.

Author

Zhao, D. L., Zhang, Y. J., Gong, H. Y., Nie, L. F., and Zhao, L.

Subjects
*SINTERING, *DIELECTRICS, *MICROWAVES, *CERAMICS, *BENDING (Metalwork)
Abstract

Si3N4 ceramics with different sintering aids are prepared by gas pressure sintering at 1800°C under 8 MPa N2 atmosphere. The mechanical and microwave dielectric properties of the Si3N4 ceramics with and without sintering aids are investigated. The results show that the sintering aids have a significant impact on the densification and mechanical properties of Si3N4 ceramics. Of all, the Si3N4 ceramics using the dry gel of yttrium aluminium garnet as sintering aids exhibit the maximum bending strength and fracture toughness, reaching 395 MPa and 4·25 MPa m1/2 respectively. However, the dielectric properties of Si3N4 ceramics are similar to that using the other two sintering aids. The improved mechanical properties of the Si3N4 ceramics are attributed to the formation of rod-like βSi3N4-particles. [ABSTRACT FROM AUTHOR]

Published
2010
Full Text
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4. Effect of BN whiskers on dielectric and mechanical properties of BNw/Si3N4 composites.

Author

Zhao, D L, Zhang, Y J, Gong, H Y, and Zhao, L

Subjects
*BORON nitride, *CRYSTAL whiskers, *MECHANICAL properties of metals, *SUPERCONDUCTING composites, *STRENGTH of materials
Abstract

BN whisker reinforced Si3N4 (BNw/Si3N4) microwave transparent composites were prepared by gas pressure sintering at 1800°C in N2 atmosphere. The effects of BN whiskers on the dielectric and mechanical properties of BNw/Si3N4 composites were investigated. The results showed that the addition of BN whiskers could effectively improve the dielectric properties of BNw/Si3N4 composites while maintaining relatively good mechanical properties compared with the addition of BN particles. The dielectric constant, bending strength and fracture toughness of the composites with 15 vol.-%BN whiskers reached 3·8, 215 MPa and 4·31 MPa m1/2 respectively. The principal crystal phases of the composites were h-BN and β-Si3N4. The interlocked microstructure of BN whiskers and rod-like β-Si3N4 was responsible for the relatively good mechanical properties of BNw/Si3N4 composites. 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