Method of surface strengthening alumina-zirconia composites usin

Details Method of surface strengthening alumina-zirconia composites usin Method of surface strengthening alumina-zirconia composites usin

1993-05-25

1994-08-09

Owens, Terry J.

Compositions: ceramic

Ceramic compositions

Refractory

501103, 427190, 427201, C04B 3510, C04B 3548, B05D 302

Patent

active

053366468

ABSTRACT:
MoO.sub.2 is used as an accelerant for transformation of zirconia (ZrO.sub.2) from a tetragonal to a monoclinic crystal phase. A ZrO.sub.2 -MoO.sub.2 alloy having an increased content of monoclinic ZrO.sub.2 is prepared by mixing MoO.sub.2 with ZrO.sub.2 followed by heat treatment. In another aspect of the invention, the surface of an alumina-zirconia composite is strengthened by heating the composite in the presence of MoO.sub.2 -ZrO.sub.2 mixed powder.

REFERENCES:
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patent: 4939107 (1990-07-01), Ketcham
Valigi, M. et al., "The Effect of Addition of Chromium or Molybdenum, Oxides on the Zirconia Tetragonal-Monoclinic Phase Transformation," Mater. Sci. Monogr., 28B (React. Solids, Pt. B) pp. 1081-1082 (1985) (CA 103(16):129757b).
Montross, C., "Effect of Contaminants from Processing Equipment on the Heat Treatment of Mg-PSZ," Mater. Forum, vol. 14, No. 3, pp. 234-238 (1990) (CERAB 7105964).
Murase, Y. et al., "Stability of ZrO.sub.2 Phases in Ultrafine ZrO.sub.2 -Al.sub.2 O.sub.3 Mixtures," J. Am. Ceram. Soc., vol. 69, No. 2, pp. 83-87 (1986).
N. Claussen et al, "Phase Transformation of Solid Solutions of ZrO.sub.2, and HfO.sub.2 in an Al.sub.2 O.sub.3 Matrix", Advances in Ceramics, vol. 3, pp. 164-167 (1981).
D. J. Green, "A Technique for Introducing Surface Compression into Zirconia Ceramics", J. Am. Ceram. Soc., 66[10], c-178 (Oct. 1983).

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