High temperature anti-oxidation and filtration behavior of micro/nano-scale porous CoAl intermetallic synthesized via rapid thermal explosion

• Published in: Corrosion science Vol. 219; p. 111216
• Main Authors: Shang, Zhichao, Cai, Xiaoping, Wang, Hao, Pahlevani, Farshid, Zheng, Yan, Yu, Yang, Zhang, Baojing, Feng, Peizhong
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.07.2023
• Subjects: Permeability; Porous materials; Space holder; Thermal explosion method; Space holder; Permeability; Thermal explosion method; Porous materials
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2023.111216

The micro/nano-scale porous CoAl intermetallic compound (IMC) was fabricated using thermal explosion (TE) method combining space holder. By investigating the samples with 3D-XRM, the link between the structure of the pores and the permeability performance of the product was established. Oxidative corrosion tests were performed in static air at 600 °C for 120 h. There are two stages of corrosion: in the first four hours of the oxidation experiment, the reaction of O was mainly dominated; after that, the diffusion of Al was dominated. This structure-function integrated porous CoAl will create a new pathway for industrial-scale high-temperature oxygenated gas filtration works. •CoAl intermetallic of high porosity (60.84%) were fabricated by rapid TE reaction.•CoAl exhibit micro/nano-scale pores by adding NaCl and nanocarbon space holder.•3D-XRM establishes the link between the pores, permeability and anti-oxidation.•Acoustic emission is used to predict the variation of CoAl mechanical properties.•The mass gain of porous CoAl is only 5.60% after oxidized at 600 °C for 120 h.