Zirconia ceramic article toughened with SiC whiskers

Details Zirconia ceramic article toughened with SiC whiskers Zirconia ceramic article toughened with SiC whiskers

1987-04-24

1989-02-14

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 95, 501103, C04B 3548, C04B 3556

Patent

active

048046434

ABSTRACT:
Whisker-toughened ZrO.sub.2 products containing 5-20 volume percent SiC whiskers of relatively low aspect ratio (<20) in a stabilized polycrystalline ZrO.sub.2 matrix are provided, exhibiting a room temperature fracture toughness (K.sub.IC) at least 1.25 times that of the ZrO.sub.2 matrix, with relatively low porosity and good strength.

REFERENCES:
patent: 4507224 (1985-03-01), Toibana et al.
patent: 4543345 (1985-09-01), Wei
patent: 4657877 (1987-04-01), Becker et al.
K. T. Faber et al., "Crack Deflection Processes-I. Theory", Acta Metall, vol. 31, No. 4 (1983), pp. 565-576.
N. Claussen, "Strengthening Strategies for ZrO.sub.2 -Toughened Ceramics at High Temperatures", Matls. Sci. Eng. vol. 71 (1985), pp. 23-38.
B. A. Bender et al. "Electron Microscopy of Ceramic Fiber-Ceramic Matrix Composites . . . ", Cer. Eng. Sci Proc., vol. 5 (1984), pp. 513`4 529.
N. Claussen, "Tetragonal Zirconia Polycrystals Reinforced with SiC Whiskers", J. Am. Cer. Soc., 69(3) 288-92 (1986).
J. V. Milewski, "Efficient Use of Whiskers in the Reinforcement of Ceramics", Adv. Cer. Metls., vol. 1, No. 1, pp. 36-41 (1986).

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