Structure and properties of nickel porous material prepared by sintering nickel oxalate and NaCl with different content

• Published in: Solid state sciences Vol. 120; p. 106720
• Main Authors: Ru-tie, Liu, Hao, Li, Jie, Chen, Zhu-bo, Wang
• Format: Journal Article
• Language: English
• Published: Elsevier Masson SAS 01.10.2021
• Subjects: Barrier agent; Nickel porous material; Pore properties; Pore-forming agent; Barrier agent; Nickel porous material; Pore-forming agent; Pore properties
• ISSN: 1293-2558; 1873-3085
• DOI: 10.1016/j.solidstatesciences.2021.106720

In this paper, nickel porous materials were prepared by powder metallurgy (PM) method with nickel oxalate and NaCl as raw materials. The pore structure characteristic of nickel porous materials prepared under different NaCl content were deeply investigated. The results show that NaCl acts as the barrier agent as well as the pore-forming agent. The prepared porous material is composed of overlapping pores among chain-like nickel particles and prefabricated pores from the barrier agents. As the NaCl content increases from 10 wt% to 20 wt%, the size of initial nickel powder after blending reduction is reduced, and then the chain-like nickel particle is also finer. Under the same sintering temperature, the sintering effect of the Ni metal framework is more obvious along with the increase of the NaCl content. With the increase of NaCl content from 10 wt% to 20 wt%, dispersion degree of chain-like nickel particles has been increased significantly, and then the agglomeration area of materials decreases at high sintering temperature. The permeability coefficient increase significantly along with the increase of NaCl content. At high sintering temperature the open porosity of materials reaches 75.9%–81.3%. [Display omitted] •The nickel porous materials are prepared by nickel oxalate and NaCl, in which NaCl acts as the barrier agent and the pore-forming agent.•When the content of NaCl increases from 10% to 20%, the initial Ni powders obtained by reduction have a greatly reduced particle size.•At the same sintering temperature, the sintering effect of the metal framework is more obvious for the sample prepared by 20% NaCl.•As the NaCl content increases from 10% to 20%, the open porosity increases at high sintering temperature.