Mechanical properties of porous PNZT polycrystalline ceramics [electronic resource].
- Berkeley, Calif. : University of California, Berkeley, 1977. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- Pages: 19 : digital, PDF file
- Additional Creators:
- University of California, Berkeley and United States. Department of Energy. Office of Scientific and Technical Information
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- Free-to-read Unrestricted online access
- Niobium-doped lead zirconate-titanate (PNZT) was used to investigate the effect of porosity on the mechanical properties of a polycrystalline ceramic. Spherical pores (110 to 150 ..mu..m diameter) were introduced by using organic materials in the initial specimen fabrication. The matrix grain size (2 to 5 ..mu..m) was kept constant. Small pores (2 to 3 ..mu..m diameter) of the order of the grain size were formed by varying the sintering conditions. The effect of porosity on strength was predicted quite well by Weibull's probabilistic approach. The Young's modulus showed a linear relationship with increase in porosity. A decrease in fracture toughness with increase in porosity was also observed. It was found that at equivalent porosities, small pore specimens gave higher strength, Young's modulus and fracture toughness compared to specimens containing large pores. Fracture surface analysis, by scanning electron microscopy, showed fracture originated either at the tensile surface or at the edge of the specimen.
- Published through SciTech Connect., 08/01/1977., "lbl-6683", " conf-770743-1", International symposium on fracture mechanics in ceramics, University Park, PA, USA, 27 Jul 1977., and Biswas, D.R.; Fulrath, R.M.
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