Physical and mechanical properties of a novel hydrogen transport membrane
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- 作者：Lily Yongjun Zhang ; Sukumar Bandopadhyay ; U. Balachandran…
- 刊名：Journal of Materials Science
- 出版年：2017
- 出版时间：April 2017
- 年：2017
- 卷：52
- 期：8
- 页码：4435-4444
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics;
- 出版者：Springer US
- ISSN：1573-4803
- 卷排序：52
文摘
A novel cermet (ceramic/metal composite) hydrogen transport membrane (HTM) was characterized for its physical and mechanical properties at both room temperature and at elevated temperature of 850 °C. The density of the HTM cermet was measured as 8.9 g/cm3 at ambient temperature with dynamic Young’s modulus of 145.5 GPa and the dynamic shear modulus (G-value) of 54.29 GPa, whereas the Poisson’s ratio (υ) is calculated to be 0.34. Vickers hardness numbers for the as-received HTM cermet are constant and in the range of 2.0–2.2 GPa, with the change of loading force from 100 to 1000 g. The flexural strength (σfs) of the HTM cermet is about 356 MPa at room temperature and decreases to 284 MPa at the elevated temperature of 850 °C in both air and nitrogen. A difference in testing atmosphere (air or N2) had insignificant effect on the load–displacement curves during the flexural strength test at the elevated temperature of 850 °C. From the load–displacement curves, HTM cermet behaves much more like elastic material at room temperature; with the temperature increased to 850 °C, its behaviour is much more like a metallic material with fractures preceded by plastic deformation. The initial yielding strength of HTM could be mainly controlled by the yield strength of the soft Pd metal material, and the zirconia fractures before yielding in Pd at room temperature, whereas at 850 °C, the yield stress of the Pd drops dramatically and allows it to work and harden in the constraint of a rigid ceramic. The final failure load is mainly dictated by ceramic fracture, while the initial yielding stress is determined on the yield strength of the soft Pd metal at both room temperature and the elevated temperature of 850 °C.