Local bonding structure in mechanically activated TiH2 and TiH2+graphite mixture

Effect of N, C and B interstitial atoms on local bonding structure in mechanically activated TiH2/h-BN, TiH2/C, and TiH2/B mixtures

“…2 shows the microstructure of TiH 2 /C and TiH 2 /B powders, milled for 66 min. Whereas milled TiH 2 forms flake-like structures some 10 nm in size [3], the samples milled with additives consist of nm-sized hydride particles embedded in an additive matrix. TiH 2 /BN has a quite similar appearance (not shown).…”

“…The TiH2 desorption was tested by temperatureprogrammed desorption (TPD) under flow conditions. Details of these experimental methods are published elsewhere [3][4][5]. Table 1 shows phase compositions of the respective samples after milling, after TPD, as well as H 2 evolution under milling, and H 2 desorption and peak temperatures recorded under TPD.…”

“…For a successful application, fast and low-temperature decomposition of metal-hydrides should be realized. High-energy ball milling is used to accelerate the process after significantly decreasing the powder size [1][2][3]. The decomposition efficiency can be improved, when compounds, which prevent particle sticking (graphite, h-BN), are added to the reactive powder before milling [3][4][5].…”

“…However, changes in local Me-H bonding structure caused by the interaction between matrix material and metal-hydride may be a key factor. The effect of graphite additive on TiH 2 thermal stability was studied in detail [3]. The aim of this work is to compare the effect of graphite, boron and h-BN additives on the thermal stability of TiH 2 .…”

Effect of Hydrogen on the Mechanical Properties of Stainless Steels

“…at sufficiently high temperatures. The kinetics of hydrogen uptake from the gas phase depends upon the elements present at the surface, [13][14][15][16][17] and especially on the composition of the gas. [1] Gas components with a higher affinity to iron than that of hydrogen, e. g. O 2 , CO, SO 2 , H 2 O vapour, inhibit hydrogen adsorption by blocking potential adsorption sites.…”