US 12,226,855 B2
Iron-aluminum-based intermetallic compound filter element and preparation method thereof
Hu Gu, Beijing (CN); Junjun Yang, Beijing (CN); Fan Wang, Beijing (CN); Guanying Liu, Beijing (CN); Yu Zhang, Beijing (CN); Ying Dai, Beijing (CN); Xuan Yang, Beijing (CN); Kun Wang, Beijing (CN); and Shiyu Lin, Beijing (CN)
Assigned to AT&M ENVIRONMENTAL ENGINEERING TECHNOLOGY CO., LTD., Beijing (CN)
Appl. No. 17/791,495
Filed by AT&M ENVIRONMENTAL ENGINEERING TECHNOLOGY CO., LTD., Beijing (CN)
PCT Filed Jun. 4, 2020, PCT No. PCT/CN2020/094403
§ 371(c)(1), (2) Date Jul. 7, 2022,
PCT Pub. No. WO2021/139081, PCT Pub. Date Jul. 15, 2021.
Claims priority of application No. 202010027214.3 (CN), filed on Jan. 10, 2020.
Prior Publication US 2023/0219173 A1, Jul. 13, 2023
Int. Cl. B23K 28/02 (2014.01); B22F 1/10 (2022.01); B22F 3/12 (2006.01)
CPC B23K 28/02 (2013.01) [B22F 1/10 (2022.01); B22F 3/12 (2013.01); B22F 2998/10 (2013.01); B22F 2999/00 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A Fe—Al intermetallic compound filter element, wherein, the Fe—Al intermetallic compound filter element comprises: at least two filter-element parts, and a rebar (9) connecting the at least two filter-element parts transversely by means of welding,
wherein,
the filter-element parts each comprises: at least two segments of Fe—Al intermetallic compound filter-element powder tube (2), and a connector connecting the at least two segments of Fe—Al intermetallic compound filter-element powder tube (2) end-to-end by means of welding; and
wherein,
the at least two segments of Fe—Al intermetallic compound filter-element powder tube (2) each comprises: a substrate framework (7) and a surface filtration membrane (8) on an exterior of the substrate framework (7), the substrate framework (7) being a pressed-and-sintered pre-alloyed Fe—Al intermetallic compound powder;
the Fe—Al intermetallic compound filter element comprises three filter-element parts, which form a group transversely and are secured by welding of the rebar (9), the rebar (9) being welded to the three filter-element parts at the position of the connector, respectively;
the surface filtration membrane (8) is a mixture of binder, water and pre-alloyed Fe—Al intermetallic compound powder that has been secondarily sintered after being coated on the substrate framework (7), wherein, the binder is at least one of polyethylene glycol, methyl cellulose, and polyvinyl alcohol;
a cross-sectional structure of the Fe—Al intermetallic compound filter element adopts an asymmetric composite structure made up of the substrate framework and the surface filtration membrane, so that the asymmetric powder filter element has a relatively small pore size, which makes the filter element have high filtration accuracy, in addition, the asymmetric powder filter element is a rigid medium, the asymmetric powder filter element is installed in group, with each group integrating at least two filter-element parts, and is secured by welding of the rebar (9) at a position of a connecting ring respectively.