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Microwave Hybrid Sintering of Nanostructured YSZ Ceramics

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Abstract:

Radiant and hybrid sintering experiments have been performed on dry and wet processed nanocrystalline 3-YSZ using both a conventional single stage and a new two stage sintering cycle. Whilst densities >98.5% of theoretical were achievable by all combinations, a nanostructure could only be retained using the two stage sintering approach. With hybrid heating the average grain sizes for die pressed samples were in the range 70 – 80 nm whilst for the more homogeneous slip cast samples a final average grain size of just 64 nm was achieved for a body with a final density of >99%. It is believed that the primary advantage offered by hybrid heating is the ability to use a much faster initial heating rate, 20 versus just 7oC min-1, without risking damage to the samples. Whilst detailed characterisation of the properties of these nanostructured ceramics is still underway, preliminary results have suggested that neither the hardness or toughness has been improved compared to conventional, submicron-sized 3-YSZ. As a result of detailed crystallographic characterisation this is believed to be due to a grain size dependent shift in the phase boundary composition for nano YSZ ceramics leading to ‘over stabilisation’ at any given yttria content.

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Periodical:

Advances in Science and Technology (Volume 45)

Pages:

835-844

DOI:

https://doi.org/10.4028/www.scientific.net/AST.45.835

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Online since:

October 2006

Authors:

Jon Binner, Bala Vaidhyanathan, Tony Carney

Keywords:

Nanostructure, Sintering, YSZ

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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References

[1] Mayo M, Int. Mater. Rev. 41 85 (1996).

Google Scholar

[2] Groza JR, Int. J. Powder Met. 35.

Google Scholar

[7] 59 (1999).

Google Scholar

[3] Messing GL and Kumagai M, Am. Ceram. Bull. 73 88 (1994).

Google Scholar

[4] Hahn H, Nanostr. Mater. 2 251 (1993).

Google Scholar

[5] Rabe T and Wasche R, Nanostr. Mater. 6 357 (1995).

Google Scholar

[6] Raghupathy B and Binner JGP, In Preparation.

Google Scholar

[7] UK Patent application No. 0512666. 9. Binner JGP, Annapoorani K and Santacruz I, (2005).

Google Scholar

[8] Santacruz MI, Binner JGP and Annapoorani K, In Preparation.

Google Scholar

[9] Rahaman MN, in Sintering Technology, ed. GL Messing and RG Cornwall, p.93, Marcel Dekker, (1996).

Google Scholar

[10] Hahn H, Averback RS, Hofler HJ and Logas J, Mater. Res. Symp. Proc. 206 569 (1991).

Google Scholar

[11] Chen I & Wang X-H, Nature 404 168-171 (2000).

Google Scholar

[12] Binner, JGP, Vaidhyanathan B, and Wang J, Proc. of the 9 th Int. Conf. on Microwave and High Frequency Heating, Loughborough, UK, 477-480 (2003).

Google Scholar

[13] British Standards, Advanced Technical Ceramics - Monolithic Ceramics - General Textural Properties, Part 3, p.10, BS EN 623-3 (2001).

Google Scholar

[14] Wang J, Binner J, Vaidhyanathan B, Joomun N, Kilner J, Dimitrakis G and Cross TE, In Press, J. Am. Ceram. Soc. (2006).

Google Scholar

[15] Vaidhyanathan B and Binner JGP, Proc. Of 4th World Congress on Microwave and RF Applications, Publ. The Microwave Working Group, 192 - 198 (2005).

Google Scholar