Abstract
Preferred orientation was measured in Si3N4/BN fibrous monolithic ceramics using x-ray diffraction. The materials were manufactured by co-extrusion of polymer binder/ceramic blends which were subsequently pyrolized and then hot-pressed to produced a fully dense ceramic composite. A very strong modified wire texture was present in the BN with the basal planes aligned parallel to the axis of extrusion due to shear-induced reorientation of the platelet-shaped BN particles during co-extrusion. Texture was also observed in the Si3N4 and was attributed to a combination of co-extrusion and hot-pressing. After hot pressing, the basal planes of the rod-shaped β-Si3N4 were observed to be preferentially aligned perpendicular to the extrusion direction. Measurements prior to hot-pressing revealed that a small amount (≈5%) of β-Si3N4 was present in the α-Si3N4 starting powder. Although texturing of the predominant α-Si3N4 did not occur during co-extrusion, significant texturing of the β-Si3N4 was observed. During subsequent hot-pressing, the pre-existing textured β-Si3N4 particles appeared to act as seeds for transformation and preferred growth of rod-shaped β grains parallel to the axis of extrusion.
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References
D. Kovar, B. H. King, R. W. Trice and J. W. Halloran, J. Amer. Ceram. Soc. 80(10) (1997) 2471.
D. Popovi ´c, J. W. Halloran, G. E. Hilmas, G. A. Brady, S. Sommers, A. Barda and G. Zywicki, Patent no. 5,645,781 (1997).
D. Kovar, M. D. Thouless and J. W. Halloran, J. Amer. Ceram. Soc. 81(4) (1998) 1004.
R. W. Trice and J. W. Halloran, ibid., 82 (1999) 2943.
R. W. Trice, Ph.D. thesis. University of Michigan, 1998.
K. Hirao, M. Ohashi, M. E. Brito and S. Kanzaki, J. Amer. Ceram. Soc. 78(6) (1995) 1687.
F. Lee, M. S. Sandin and K. J. Bowman, ibid. 76(7) (1993) 1793.
S. Baskaran, S. D. Nunn, D. Popovic and J. W. Halloran, ibid. 76(9) (1993) 2209.
G. Hilmas, A. Brady, U. Abdali, G. Zywicki and J. Halloran, Mat. Sci. Eng. A A915 (1995) 263.
JCPDS no. 41-360, Powder Diffraction File; edited by T.M. Kahmer et al. (International Centre for Diffraction Data, Newton Square, PA, 1997).
JCPDS no. 33-1160, Powder Diffraction File; edited by T. M. Kahmer et al. (International Centre for Diffraction Data, Newton Square, PA, 1997).
Y. Goto and A. Tsuge, J. Amer. Ceram. Soc. 76(6) (1993) 1420.
T. Carisey, I. Levin and D. G. Brandon, J. Eur. Ceram. Soc. 15(4) (1995) 283.
M. M. Seabaugh, I. H. Kerscht and G. L. Messing, J. Amer. Ceram. Soc. 80(5) (1997) 1181.
F. V. Dimarcello, P. L. Key and J. C. Williams, ibid. 55(10) (1972) 509.
Y. Nakada and T. L. Schock, ibid. 58(9/10) (1975) 409.
Y. Goto, A. Tsuge and K. Komeya, J. Eur. Ceram. Soc. 6(4) (1990) 269.
M. D. Sacks, G. W. Scheiffele and G. A. Staab, J. Amer. Ceram. Soc. 79(6) (1996) 1611.
K. Hirao, K. Watari, M. E. Brito, M. Toriyama and S. Kanzaki, ibid. 79(9) (1996) 2485.
D. Brandon, D. Chen and H. Chan, Mat. Sci. Eng. A A195(1/2) (1995) 189.
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Lienard, S.Y., Kovar, D., Moon, R.J. et al. Texture development in Si3N4/BN fibrous monolithic ceramics. Journal of Materials Science 35, 3365–3371 (2000). https://doi.org/10.1023/A:1004880901978
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DOI: https://doi.org/10.1023/A:1004880901978