Effect of hydrogen pressure on hydrogenation and pulverization behavior of Sm(CoFeCuZr)z ingot and strip casting flake

Strip Casting of Sm2TM17-Type Alloys for Production of the Metastable SmTM7 Phase

“…As the strip casting parameters were not given and limited microstructural analysis was presented, no direct comparisons can be made regarding the optimisation of the strip casting process. Yang et al and Yang et al [20,21] demonstrated very similar findings to Meng et al [19], showing that slower wheel speeds in strip casting led to better magnetic properties; however, as Meng et al, were utilising the full manufacturing route for magnet processing and were not aiming to circumvent the long heat treatment as would be the aim of this work. Likewise, direct comparison with Zheng et al [22] is limited as they did not optimise the strip casting process; however, they obtained a similar combination of phases of the alloy but were not able to demonstrate directional columnar growth from the wheel side to the free side of the flake as presented in this work.…”

“…Whilst this showed very promising results from a magnetic point of view, it did not focus on direct production of the metastable 1:7H phase [20]. Yang et al [21] investigated hydrogen decrepitation of strip cast alloys similar to those presented in [20]. However, the micrograph showing the full cross-section of the alloy showed a rough surface that solidified in contact with the wheel, with a small nucleation zone and predominantly non-directional or equiaxed growth.…”

CoZr nanocomposites in a ceramic–metal AlOx(OH)y/Al matrix with a different Co/Zr ratio and its potential for syngas processing

“…In the subsequent hydrogen treatment under pressure, zirconium 22 -Co fcc single domain). 25 Afterwards, the hydrothermal treatment of mechanical mixtures of CoZr n H alloys and metallic aluminum powder is carried out to obtain ceramic-metal samples. In addition, the overall picture is significantly complicated.…”

“…We can conclude that for the Co 2 ZrH/CM sample, there is no sufficient interaction between the phases of metallic cobalt and zirconium. Subsequently, when treated with hydrogen during the dispersion of zirconium, [23][24][25] this leads to smaller cobalt dispersion and, as a consequence, a lower specific surface area of the resulting Co-Zr powder nanocomposite.…”

“…22 The treatment with gaseous hydrogen at high pressure is one of the possible approaches (or rather a group of approaches) used for particle dispersion (hydrogen pulverization). [23][24][25]…”