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| Permeability, Thermal Conductivity and the Pore Characters of Sintered Porous Metal Materials |
| REN Xiao-Jun-1, ZHANG Peng-1, WANG Xiao-Jun-2, PAN Yan-Pin-2 |
| (1. Institute of Refrigeration and Cryogenics, Shanghai Jiaotong University, Shanghai 200240, China; 2. National Key Lab of Vacuum & Cryogenics Technology and Physics, Lanzhou Institute of Physics, Lanzhou 730000, China) |
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Abstract In order to characterize the sintered porous metal materials, porosity was tested. Surface porosity, average pore size and pore size distribution were obtained through image processing and analysis based on scanning electron microscope(SEM) images of nature fracture surfaces. Permeability and air permeability were measured by experimental apparatus based on Darcy’s law, and the effects of original power grain size, porosity, thickness, low temperature condition, average pore size and pore size distribution on permeability were also discussed. Effective thermal conductivities were measured by a hot disk thermal constant analyzer and compared with predicted results from empirical equations. The results demonstrate that volume average pore size and pore size distribution can effectively reflect the change of air permeability, and thickness has an important influence on porosity and permeability. A stronger wall effect is presented in the case of a thinner thickness and a bigger original power grain size. Low temperature condition has no influence on permeability.
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Received: 13 April 2012
Published: 28 March 2013
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