Hydride formation in mechanically alloyed AlZr and AlFeZr

Mechanochemically assisted synthesis of titanium carbonitride from metal and organic precursor

“…The formation of TiH 2 in the early milling stage is consistent with the formation of metal hydrides during the milling of metals with organic additives containing hydrogen. 22,24,25 Xiang et al 27,28 reported that the refined metal particles can serve as a catalyst in the decomposition of organic solutions and form hydrides with hydrogen. With increasing milling time, the intensity of the diffraction peaks of TiC x N y H z increased continuously.…”

“…Solid organic compounds, such as urea and stearic acid can decompose during high-energy ball-milling, forming fine dispersions of metal carbides, [19][20][21] nitrides, 22,23 and metal hydrides. 24,25 Chen et al successfully synthesized TiC 0.37 N 0.63 nanopowders by a mechanochemical method using solid melamine as the precursor. 26 Compared with solid organics (such as urea, stearic acid, and melamine), liquid organic solutions are of greater interest because they can rapidly cover the exposed fresh surface of the milled particles, and may therefore react faster with them.…”

“…Some solid organic compounds have been explored because they can serve as not only the process control agent (PCA) to decrease the cold welding and particle agglomeration, but also the source of carbon and nitrogen for the formation of transition‐metal carbides and nitrides. Solid organic compounds, such as urea and stearic acid can decompose during high‐energy ball‐milling, forming fine dispersions of metal carbides, 19‐21 nitrides, 22,23 and metal hydrides 24,25 . Chen et al successfully synthesized TiC 0.37 N 0.63 nanopowders by a mechanochemical method using solid melamine as the precursor 26 .…”

Mechanochemically activated synthesis of zirconium carbide nanoparticles at room temperature: A simple route to prepare nanoparticles of transition metal carbides

“…This is in an agreement with the formation of metal hydrides during the milling of metals with organic additives containing a hydrogen component. 26,34,35 When the milling duration increases above 1 h, the reflection peaks of ZrC x were found to appear. They grew continuously in intensity with the increase of t, and become dominant when t is longer than 3 h. By analyses of the XRD spectra with the help of the MAUD programs, 39 the developments of Zr, ZrH 2 , and ZrC x phases with the milling time have been determined in volume fraction and grain size, 40 which are shown in Fig.…”

“…Formation of NbC powder was reported during the grinding of Nb and graphite powder mixture with hexane or methanol, and was considered to the mechanically assisted reaction of carbon with the intermediate product of NbH x . 26 By mechanochemically milling metal powders with different organic substances, powders of metal carbides (such as Fe 3 C 27 ), metal nitrides (such as AlN, 28 TiN, 29,30 and Fe 3 N 31,32 ), and metal hydrides (such as TiH x , 33 ZrH x , 34 and NbH x 26,35 ) had been reported to be synthesized. Suzuki and coworkers reported the formation of phases with fcc-like structure resembling that of ZrC or TiC during the milling of Zr powder or Ti powder with n-heptane.…”