Mullite zirconia composites

Garrido L B, Aglietti E F. Reaction-sintered mullite-zirconia composites by colloidal processing of alumina-zircon-Ce02 mixtures. Mater Sci Eng A, 2004, 369 (12) 250-257. 

EFFECT OF MULLITE GRAINS ORIENTATION ON TOUGHNESS OF MULLITE/ZIRCONIA COMPOSITES... 

In this study the effect of texture on fracture toughness was studied by varying the template s aspect ratio. SEM analyses were done for microstmeture characterization. Rocking curve was done to quantify the orientation distribution of mullite grains in the mullite/zirconia composite. Elastic modulus, strength, hardness and toughness of the composites were measured and correlated to the textured microstructure. 

Effect of Mullite Grains Orientation on Toughness of Mullite/Zirconia Composites... 

C. Duran, and Y.K.Tiir, Phase Formation and Texture Development in Mullite/Zirconia Composites Fabricated by Templated Grain Growth, J. Mater. Sci, 41, 3303-13 (2006). 

N. Claussen and J. Jahn, Mechanical Properties of Sintered, In situ-Reacted Mullite-Zirconia Composites, J.Am. Ceram. Soc., 63 [3 ] 228-29 (1980). 

C. Baudin De La Lastra, C. Leblud, A. Leriche, F. Cambier, and M. R. Anseau, Kic Calculations for Some Mullite-Zirconia Composites Prepared by Reaction Sintering, /. Afoter. Sci. Lett., 4 [9] 1099-101 (1985). 

C.-C. Lin, A. Zangvil, and R. Ruh, Phase Evolution in Siheon Carbide-Whisker-Reinforced Mullite/Zirconia Composites during Long-Term Oxidation at 1000° to 1350°C, /. Am. Ceram. Soc., 83 [7] 1797-803 (2000). 

T. Koyama, S. Hayashi, A. Yasumori, K. Okada, M. Schmiicker, H. Schneider, Microstructure and mechaiiical properties of mullite/zirconia composites prepared from alumina and zircon under various firing conditions, J. Europ.Ceram. Soc. 16 231—237 (1996). 

Reaction-sintering, sintering (q.v.) of a two-component powder, in which a chemical reaction also takes place to produce a dense single phase or a multiphase material. Ceramic-ceramic composites may be thus produced - e.g. dense mullite zirconia composites from zircon and alumina. See also reactive HOT-PRESSING. 

Claussen and Jahn ° were the Erst researchers to show that the mechanical properties of mullite could be improved by the dispersion of zirconia particles. Fracture toughness improved from 2.0 to 4.5 MPa-ml4 and the strength doubled to 400 MPa. They were able to fabricate the dense (>98% theoretical density (T.D.)) mullite-zirconia composite at relatively low sintering temperatures of 1575-1600 °C by the in-silu reaction of alumina and zircon to form mullite with approximately 25 vol% zirconia ... 

Prochazka, S., Wallace, J.S. and Claussen, N., Microstructure of Sintered Mullite-Zirconia Composites. J. Amer. Ceram. Soc. 66 C125-126 (1983). 

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