Transformation toughened ceramics

Transformation toughening ceramics, 5 621-622 Transformed composition space, 22 330-331 Transforming particles ceramic—matrix composite reinforcement, 5 571—572 Transgene expression, controllable, 12 453 Transgenes, 12 452, 453... [Pg.963]

Figure 8.63 The fracture toughness of transformation-toughened ceramics will be limited by the transformation stress. In the shaded region, however, strength will be dependent on flaw size and the shape of the R curve.

$Figure 8.63 The fracture toughness of transformation-toughened ceramics will be limited by the transformation stress. In the shaded region, however, strength will be dependent on flaw size and the shape of the R curve.$

Transformation-toughened ceramics exhibit decreasing strength with increasing temperature (see Section 8.11). [Pg.298]

The surface of transformation-toughened ceramics can be transformed by grinding. For a single-phase, yttria-stabilized zirconia,... [Pg.314]

Tien TY, Transformation toughened ceramics - a potential material for light diesel engine applications, AMMRC TR84-26, Army Materials and Mechanics Research Center, MA, Jun 1984. [Pg.623]

In PSZ, the toughening is due to the transformation of the precipitates, which can take lenticular shapes. A common PSZ is Mg-PSZ, while the TZP s in use are Y-TZP and Ce-TZP. Also note that in TZP, transformation occurs within the grains (Fig. 8.68b), whereas in ZTA it occurs in the dispersed zirconia particles (Fig. 8.68c). Often the abbreviation DZC (i.e., dispersed zirconia ceramics) is applied to the stress-activated transformation in t-Zr02 particles dispersed in a ceramic matrix. In Fig. 8.68c, the ZTA is a commercially developed DZC system. The main objective of the fabrication of a transformation-toughened ceramic is the retention of t-Zr02, which transforms into m-Zr02 at or close to RT under the influence of an applied stress having a shear component. Control of the composition and thermal treatment are also important parameters in the fabrication of... [Pg.683]

A manuscript entitled Transformation-Toughened Ceramics with Strength Retention to High Temperatures by R. A, cutler,... [Pg.172]

R. A. Cutler, J. J. Hansen, A. V. Virkar, D. K. Shetty, and R. C. Winterton, "Strength Improvement in Transformation Toughened Ceramics using Compressive... [Pg.172]

Prouse, A. V. Virkar and D. K. Shetty, "Processing and Characterization of Transformation Toughened Ceramics with Strength Retention to Elevated Temperatures," Bimonthly ORNL/CF-89/307 pp. 135-142 (ORNL, Oak Ridge, TN 1989). ... [Pg.173]

Characterization of Transformation-Toughened Ceramics Jeffrey J. Swab (U.S. Army Materials Technology Laboratory)... [Pg.347]

Fatigue is also observed in transformation-toughened ceramics, like partially stabilised zirconium oxide (see sections 7.2.4 and 7.5.4), where phase transformations occur near the crack tip. This effect is attributed to the formation of microcracks in the vicinity of the crack tip [66]. [Pg.345]

Transformation toughening is one of the best methods of improving the fracture toughness and strength of brittle ceramic materials. Among the transformation toughened ceramics, alumina-zirconia and muUite-zirconia composites are the most widely studied systems. [Pg.1319]

Claussen, N. and Riilile, M., Design of transformation toughened ceramics. In Advances in Ceramics> eda, RoClaussen, Amer. Ceram, Soc. Inc., Columbus, 1986, 12, pp. I37-65o... [Pg.269]

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