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Fe based honeycomb carrier material preparation and microstructure and properties of

Author: DuYuJie
Tutor: ZhouZuo
School: Kunming University of Science and Technology
Course: Materials Physical Chemistry,
Keywords: metallic honeycomb catalyst sintering 316L Fe-Cr-Al
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Type: Master's thesis
Year: 2013
Downloads: 33
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Abstract


Metal honeycomb is a new kind of multifunctional composite materials which is similar to the bees nest. Application field of metal honeycomb has been involved in transportation, aerospace, energy and chemical industry, etc. Recently metal honeycomb has already been used in the automobile exhaust purification catalyst carrier. For foil winding metal honeycomb carrier existing shortcomings on the market at present, this paper presents a method that is powder plasticized extrusion-sintering process,for preparing low-cost, high-performance metal honeycomb carrier. The paper on metal honeycomb extrusion and sintering and organizational performance analysis was studied systematically, the main research content and results are as follows:(1) Depending on the materials of the honeycomb carrier selection principle, the experiment selected316L stainless system and Fe-Cr-Al alloy system for resistant to high temperatures and antioxidant.(2) Throughout the extrusion process, extrusion dies, feeding ring, mixture ratio are key factors for extruding metal honeycomb forming, and the feeding ring should not be too big or too small, the best choice is31.6mm and31.6mm. For316L extruding paste,76%and77%powder loading are optimal. For Fe-Cr-Al extruding paste,74%and75%are optimal.(3) For316L sintered stainless honeycomb, the volume shrinkage and density increased with sintering temperature and time. For Fe-Cr-Al sintering honeycomb, the volume shrinkage increased with sintering time under the same sintering temperature(1000℃),but the density reduced.(4) For316L stainless alloy sintered in a hydrogen atmosphere,the substrate is a solid solution of Fe-Cr-Ni-C (γ-Fe), and the second phase particles are rich in Si which is low melting point compounds. The substrate surface formed a oxidation of Cr1.3Fe0.7O3.Through the analysis of the impact on sintering temperature and sintering time for the316L cellular tissue, we determined the best sintering process:1150℃sintering temperature, sintering time to20min. Sintering atmosphere in Fe-Cr-Al alloy has great influence on final composition, Al oxidation of sintering organization lead to cellular densification difficult to carry out under the hydrogen atmosphere, and the sintered honeycomb overall strength is not high; Under inert gas sintering tissue existed oxidation seriously,but sintered honeycomb had low intensity for the various oxides mutual sintering together. The longer the sintering time is, the more the metal honeycomb’s sintered structure is dense.(5) Experiment determined the parameters of316L stainless and Fe-Cr-Al metal sintered honeycomb structure, specific surface area, surface adsorption and mechanical properties.

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