Pore Formation Mechanism and Oxidation Resistance of Porous Coal3 Intermetallic Prepared by Rapid Thermal Explosion
Porous CoAl 3 intermetallic is a candidate material in the field of catalytic and filtration due to its high porosity, good thermostability and quasicrystal structure. However, its rapid and reliable preparation are still a challenge, and the high-temperature antioxidant mechanism need to be further clarified. In this work, we have rapidly prepared porous CoAl 3 intermetallic by thermal explosion (TE) reaction and explored the possible antioxidant mechanism. The results show that when the Co-75at.%Al compact is continuously heated to 900 °C, the DSC curves show two exothermic peaks at 616 °C and 646 °C, corresponding to the solid-phase diffusion and TE reaction, respectively. The heat released from the two reactions led to the expansion of the compact, which reached a maximum of 104% at 800 °C, and the corresponding open porosity reached at 53%. The pore sources include the original pores during the green compact pressing process, the Kirkendall pores generated by the solid-phase diffusion process and the in-situ pores generated by the Al consumption after the TE occurs. The cyclic oxidation at 700 °C show that the porous CoAl 3 intermetallic follows the parabolic oxidation law, and a continuous oxide film formed on the skeleton surface to block the oxidation of metal substrate. It has been found that porous CoAl 3 can combine the oxidation resistance of Co-Al monoliths alloys and the high porosity of porous materials, which have potential applications in the field of catalysis such as methanation at 600-700 °C
Year of publication: |
[2022]
|
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Authors: | Xu, Chengyi ; Cai, Xiaoping ; Yu, Yang ; Wang, Xiaohong ; Wang, Jianzhong ; Feng, Peizhong |
Publisher: |
[S.l.] : SSRN |
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