RELATIONSHIP BETWEEN GRAIN SIZE AND STRENGTH FOR 3Y-TZP CERAMICS

摘要

It is put forward in this paper that the relationship of the grain size and the strength is out of accord with that of Hall-Petch relationship when the grain size is below a micron(<1 μm) for ZrO_2 or TZP ceramics. Especially in the nanocrystalline, the smaller the grain sizes were, the lower the strengths were. The relationship of the grain size and the flexural strength found here accords with the following equation: σ_b=aD~(-b/D)Where σ_b is the flexural strength and D is the grain size, a and b are constants of materials.