Paper Titles
Investigation of the Sintering Behavior of Ultrapure α-Alumina Containing Low Amounts of SiO2 or CaO
p.1
Sintering Behavior of Microstructured γ-Alumina with Nanosized γ-Alumina Additive
p.7
Control of Shrinkage during Sintering of Alumina Ceramics Based on Master Sintering Curve Theory
p.11
Bulk Consolidation of Non-Oxide Ceramic Powders Derived from Polymer Precursors
p.15
Centrifugal Sintering
p.19
Low-Temperature Sintering of α- and β-SiC Powders with AlB2 Additive
p.23
Sintering and Characterization of Zr2Al3C5 Monolith
p.27
Thermal Evolution of Single Phase Lanthanum Zirconate
p.31
Sinterability of Alumina-Dispersed 3Y-TZP
p.37

Sintering Behavior of Microstructured γ-Alumina with Nanosized γ-Alumina Additive

Article Preview

Abstract:

In order to fabricate an alumina ceramics with high density at low sintering temperature, nanosized γ–Al2O3 powders with average size of 9.7 nm were added to microsized γ–Al2O3 powders with 2 #m and they were well mixed. Its sintering behavior was studied in the temperature range of 1000oC to 1300oC and in holding time from 1 hour to 10 hours. Compacted samples with a different mixed ratio of nanosized and microsized Al2O3 powders (N/M ratio) were prepared and pressured at 1 GPa in a uniaxial direction. The phase transformation from γ–Al2O3 to α–Al2O3 takes place at 1100oC for 1hour sintering in all compacted samples. This rate is increased with increasing N/M ratio. The relative density varied from 70% to 95% depending on temperature and N/M ratio. With increasing sintering temperature from 1000oC to 1300oC, it was changed from 70% to 93%. Especially, the relative density was enhanced about 9% higher than that of only microsized sample by only 10 wt% addition of nanosized powders.

You might also be interested in these eBooks
The Science of Engineering Ceramics III View Preview

Info:

Periodical:

Key Engineering Materials (Volumes 317-318)

Pages:

7-10

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.317-318.7

Citation:

Cite this paper

Online since:

August 2006

Authors:

S.W. Oh, Hiroyuki Muto, K. Muramoto, Wataru Minami, Hee Joon Kim

Keywords:

Densification, Lower Sintering Temperature, N/M Ratio

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2006 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] H. Noda, K. Muramoto, H. Kim, J. Mater. Sci., Vol. 38 (2003), p. (2043).

Google Scholar

[2] J. Freim, J. McKittrick, J. Katz and K. Sickafus, Nanostructured Mater., Vol. 4 No. 4 (1994), p.371.

Google Scholar

[3] S. -C. Liao, Y. -J. Chen, B.H. Kear and W.E. Mayo, Nanostructured Mater., Vol. 10, No6 (1998), p.1063.

Google Scholar

[4] Rajiv S. Mishra, Charles E. Lesher and Amiya K. Mukherjee, J. Am. Ceram. Soc., Vol. 79, No. 11 (1996), p.2989.

Google Scholar

[5] S.W. Oh, H. Noda, and H.J. Kim, J. Ceram Soc. Jap, supplement, Vol. 112, No. 5 (2004) p. S933.

Google Scholar

[6] Y. Chen, N. Glumac, B.H. Kear, and G. Skandan, Nanostructured Mater., Vol. 9 (1997), p.101.

Google Scholar

[7] M.T. Hernandez and M. Gonzalez, J. Eur. Ceram. Soc., Vol. 22 (2002), p.2861.

Google Scholar

[8] Kristen H. Brosnan, Gary L. Messing and Dinesh K. Agrawal, J. Am. Ceram. Soc. Vol. 86, No. 8 (2003), p.1307.

Google Scholar

[9] C. Scott Nordahl and Gary L. Messing, J. Am. Ceram. Soc. Vol. 79, No. 12 (1996), p.3149.

Google Scholar

[10] K. Darcovich, L. Bera and K. Shinagawa, Mater. Sci. and Eng., A341 (2003).

Google Scholar