Microstructures and Mechanical Properties of Fine-Scale Fibrous Alumina / Zirconia Bi-Phase Composite Fabricated by Co-Extrusion Process

Abstract:

Article Preview

A bundle of feedrod composed of ordinary arranged alumina and zirconia green rods was co-extruded through a 6:1 reduction die. The volume fraction of zirconia phase was varied from 10 to 88 vol%. After the first co-extrusion, the individual pieces were bundled and co-extruded again, reducing the lateral size of each phase and multiplying the number of continuous monofilaments. After a 3rd extrusion step and sintering at 1600oC, crack-free composites with a fiber diameter of ~50 μm were obtained for all compositions. The fracture toughness of the composites was improved by introducing fine second phase filaments into the matrix. The maximum fracture toughness of 6.2 MPam1/2 was attained in the 3rd co-extruded composite which consisted of 53 vol% alumina and 47 vol% zirconia. Bending strength of the composites was almost the same as that of the monolithic alumina regardless of the composition.

Info:

Periodical:

Key Engineering Materials (Volumes 317-318)

Edited by:

T. Ohji, T. Sekino and K. Niihara

Pages:

619-622

DOI:

10.4028/www.scientific.net/KEM.317-318.619

Citation:

H. Miyazaki et al., "Microstructures and Mechanical Properties of Fine-Scale Fibrous Alumina / Zirconia Bi-Phase Composite Fabricated by Co-Extrusion Process", Key Engineering Materials, Vols. 317-318, pp. 619-622, 2006

Online since:

August 2006

Export:

Price:

$35.00

[1] O. Prakash, P. Sarkar and P.S. Nicholson: J. Am. Ceram. Soc. Vol. 78 (1995), p.1125.

[2] M. Menon and I.W. Chen: J. Am. Ceram. Soc. Vol. 82 (1999), p.3413.

[3] D. Kovar, B.H. King, R.W. Trice and J.W. Halloran: J. Am. Ceram. Soc. Vol. 80 (1997), p.2471.

[4] H. Miyazaki, Y. Yoshizawa and K. Hirao: Material Letter Vol. 58 (2004), p.1410.

[5] H. Miyazaki, Y. Yoshizawa and K. Hirao: J. Ceram. Soc. Jpn. Supplement Vol. 112 (2004), p. S130.

[6] R.C. Garvie and P.S. Nicholson: J. Am. Ceram. Soc., Vol. 55 (1972).

In order to see related information, you need to Login.