Structural, Microstructure, Mechanical and Electrical Properties of Porous Zr 4+ -Cordierite Ceramic Composites
作者： M. M. S. Sanad , M. M. Rashad , E. A. Abdel-Aal , M. F. El-Shahat , K. Powers
DOI: 10.1007/S11665-013-0831-5
关键词:
摘要: Zirconium-cordierite ceramic composites have been synthesized by a co-precipitation method using MgCl2·6H2O, NaAlO2, Na2SiO3·5H2O, and ZrOCl2·8H2O as starting materials. XRD, FT-IR, SEM techniques were employed to study the effect of zirconium on crystal structure microstructure samples. XRD results revealed that spinel MgAl2O4 t-ZrO2 phases predominant in samples with low Zr4+ content (10 wt.%), whereas zircon ZrSiO4 was high (≥15 wt.%). The densification behavior improved from 30.4 44.6% theoretical density (2.6 g/cm3) at 15 wt.% Zr4+. However, microhardness sintered enhanced 7.1 7.5 GPa increasing dose 0 25 wt.%. On other hand, gradual increase led suppression electrical resistivity (ρ) 16.6 2.8 × 109 Ω/cm, respectively. In addition, dielectric permittivity (e) pure cordierite decreased ion addition. maximum frequencies MHz) 18.7 10 content, (1 GHz) it 38.8 content.
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