*Z191 *PSZ-Z20t *CTZP

5 wt. Z Y203 Stabilized Zr02 (With 10% A1203 Addition)

5 wt X Y203 Stabilized Zr02

5.4 wt. X Y20j Stabilized ZrO.,

Ce02 Stabilised Zr02 (with 10Z A1203 Addition)

Multi-phase Material With Grains 2-4 pm

Dense, Fine Grained Material 0.3in

Dense, Fine Grained Material 0.3 iia

Two Phase Material With Grain Size 1-4 ii m

•Materials Selected for the Phase II Study +Materials Selected for the Phase III Study in controlled environments at various loading rates to determine the dynamic fatigue constants and to determine if slow crack growth was occurring. In addition, the effect of aging the candidate material at low temperature (150°-300°C) was evaluated during Task II. The aging studies were carried out in 10% H20, dry N2 , and vacuum environments (see Table 3 for the aging schedule used for this study). Flexure testing, x-ray diffraction analysis (XRD), Raman, and Fourier transform infrared spectroscopy (ATR-FTIR) were used to evaluate the aged specimens. The results of the Task II evaluations were used to select two materials for more intensive dynamic fatigue evaluation in Task III. An additional study was performed using laboratory prepared specimens to determine the effects of aging on Zr02 containing 2, 3, and 4 mole percent Y203 stabilizer (2Y, 3Y, 4Y). These Y203 stabilized Zr02 specimens were cold pressed and sintered for 20 hours at 1400°C. This fabrication procedure produced high density discs with an average particle size of 0.5 Mm. These discs were aged in a number of different environmetns and then evaluated by XRD, Raman, and ATR-FTIR analysis (see Table 4).

Table 3. Investigation of Aging Effects on Commercial Materials


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