Effect of Sintering Additive La2O3 Content on Properties of Si3N<sb>4-AlN Composite Ceramics Prepared by Hot-Pressing Sintering

XU Peng; CHEN Xing; YANG Jian; QIU Tai

Materials and Mechanical Engineering > 2011 > 35(1): 11-14.

XU Peng, CHEN Xing, YANG Jian, QIU Tai. Effect of Sintering Additive La₂O₃ Content on Properties of Si₃N4-AlN Composite Ceramics Prepared by Hot-Pressing Sintering[J]. Materials and Mechanical Engineering, 2011, 35(1): 11-14.

Citation:

PDF (810 KB)

Effect of Sintering Additive La₂O₃ Content on Properties of Si₃N4-AlN Composite Ceramics Prepared by Hot-Pressing Sintering

More Information

Received Date: October 11, 2010

Graphical Abstract

Abstract

Abstract

Si3N4-AlN composite ceramics were prepared by hot-pressing sintering at 1 800 ℃ under 30 MPa for 1 h in nitrogen atmosphere with AlN and Si3N4 as raw materials and La2O3 as sintering additive. The effect of La2O3 content on sintering performance, bending strength, thermal conductivity and dielectric loss of the composite ceramies was investigated. The results show that with the increase of La2O3 content, the porosity of the ceramics decreased first and then reached a fixed value, the phase transformation Si3N4 from α to β was gradually completed and more lanthanum-melilites were found in the grain boundaries. With the increase of La2O3 content, bending strength of the composites decreased gradually, dielectric loss decreased first and then increased, while the thermal conductivity increased first and then decreased. When the La2O3 content was 4% the bending strength reached maximum 574 MPa. The lowest dielectric loss of 4.55×10-3 and highest thermal conductivity of 11.7 W·m-1·K-1 were obtained at a La2O3 content of 6%.
- Si3N4-AlN composite ceramic,
- bending strength,
- thermal conductivity,
- dielectric loss

FullText(HTML)

References (16)

References

[1]	高陇桥.大功率真空电子器件实用高导热率陶瓷的进展[J].真空电子技术, 1999(2): 27-31.
[2]	李晓云, 步文博, 徐洁.AlN-BN复合陶瓷及在微波输能窗上的应用[J].南京化工大学学报, 2001, 23(6): 103-106.
[3]	SLACK G A, TANZILLI R A, POHL R O, et al. The intrinsic thermal conductivity of AlN[J].J Phys Chem Solids, 1987, 48(7): 641-647.
[4]	WATARI K, HWANG H J, TORIYAMA M, et al. Effective sintering aids for low-temperature sintering of AlN ceramics[J].J Mater Res, 1999, 14(4): 1409-1417.
[5]	HIRAI T, HAYASHI S, NIIHARA K. Thermal diffusivity, specific heat and thermal conductivity of chemically vapor-deposited Si3N4[J].Am Ceram Soc Bull, 1978, 57: 1126-1131.
[6]	ZIEGLER G. Thermal properties and thermal shock resistance of silicon nitride[J].Progress in Nitrogen Ceramics, 1983, 27(7): 565-588.
[7]	HAYASHI K, TSUJIMOTO S, NISHIKAWA T, et al. Thermal conductivity of reaction bonded Si3N4[J].Yogyo Kyokai Shi, 1986, 94: 595-600.
[8]	WATARI K, SEKI Y, ISHIZAKI K. Thermal properties of HIP sintered silicon nitride[J].Seramikkusu Rombunshi, 1989, 97: 56-62.
[9]	SLACK G A. Nonmetallic crystals with high thermal conductivity[J].J Phys Chem Solids, 1973, 34(2): 321-335.
[10]	HAGGERTY J S, LIGHTFOOT A. Opportunities for enhancing the thermal conductivities of SiC and Si3N4 ceramics through improved processing[J].Ceram Eng Sci Proc, 1995, 16(4): 475-487.
[11]	WATARI K, HIRAO K, TORIYAMA M. Effect of grain size on the thermal conductivity of Si3N4[J].J Am Ceram Soc, 1999, 82(3): 777-779.
[12]	SHEN Z J, EKSTROM T, NYGREN M. Homogeneity region and thermal stability of neodymium-doped α-Sialon ceramics[J].J Am Ceram Soc, 1996, 79(3): 721-732.
[13]	MANDAL H, THOMPSON D P. CeO2-doped α-Sialon ceramics[J].J Mater Sci Lett, 1996, 15(16): 1435-1438.
[14]	KUME S, YASUOKA M, OMURA N, et al. Dielectric properties of sintered aluminum nitride[J].Int J Refract Met Hard Mater, 2005, 23(4/6): 382-385.
[15]	PARK M K, KIM H N, LEE K S, et al. Effect of microstructure on dielectric properties of Si3N4 at microwave frequency[J].Key Eng Mater, 2005, 287: 247-252.
[16]	OHNO H. Dielectric and electrical design consideration of ceramics for fusion devices[J].J Nucl Mater, 1991, 178/181: 60-63.

Cited By

Get Citation

PDF

XML

Article views PDF downloads

Turn off MathJax

Article Contents

Abstract

References

Effect of Sintering Additive La2O3 Content on Properties of Si3N4-AlN Composite Ceramics Prepared by Hot-Pressing Sintering

Abstract

References

Catalog

Export File

Citation

Format

Content

Effect of Sintering Additive La₂O₃ Content on Properties of Si₃N4-AlN Composite Ceramics Prepared by Hot-Pressing Sintering