Ni coatings

The impact process of a 3.8 mm water droplet under the conditions experimentally studied by Chen and Hsu (1995) is simulated and the simulation results are shown in Figs. 16 and 17. Their experiments involve water-droplet impact on a heated Inconel plate with Ni coating. The surface temperature in this simulation is set as 400 °C with the initial temperature of the droplet given as 20 °C. The impact velocity is lOOcm/s, which gives a Weber number of 54. Fig. 16 shows the calculated temperature distributions within the droplet and within the solid surface. The isotherm corresponding to 21 °C is plotted inside the droplet to represent the extent of the thermal boundary layer of the droplet that is affected by the heating of the solid surface. It can be seen that, in the droplet spreading process (0-7.0 ms), the bulk of the liquid droplet remains at its initial temperature and the thermal boundary layer is very thin. As the liquid film spreads on the solid surface, the heat-transfer rate on the liquid side of the droplet-vapor interface can be evaluated by... 

Tubules prepared from phospholipids Ni-coated tubules Saturation magnetization was determined 125... 

Microscopic and spectroscopic investigations (SEM and XPS) reveal the relatively fast change of the chemical composition of nickel sulfide coatings upon the onset of cathodic hydrogen evolution (74). Indeed, at 90°C all nickel sulfide phases are reduced to porous nickel within several days to a week s time. They lose some catalytic activity with time with an increase in overvoltage between 0.15 and 0.3 V after continuous operation for 1 year. It is clear that the catalyst after I week is already no longer nickel sulfide but some type of Raney nickel. Thus far the initial catalytic activity of the NiS, coating is of little relevance. The respective results and data are due to be published by the present authors (73). 

Fig. 24. Current-potential curves for hydrogen evolution in 35 wt% NaOH at 85 °C. (1) Electroless Ni coating (2) Thermally prepared Ru02 (3) Ru02 with electroless Ni coating. After ref. 489, by permission of Elsevier Sequoia.

Ml, Norma triclad, bullet. 38 S W, Kynoch, bullet. 38 Equaloy, bullet Cu/Ni-coated Fe jacket/Pb core (trace Sb) Unjacketed Pb (trace Sb) Al bullet outside skin (Al, Ti, major Cl, Fe, P, S, trace), inside Al only... 

AUTO, REM-UMC, round Cu jacket/Pb core, brass case, Ni-coated brass primer cup... 

AUTO, R-P, round. 32 AUTO, GECO LT, round. 32 AUTO, RWS, round Cu jacket/Pb core, double-based propellant Ni-coated brass jacket/Pb core, brass case Unjacketed Pb bullet, brass case, Cu primer cup, black powder... 

Mk, HP, round Fe jacket/Pb core (trace Sb, Fe, Cu, Al, Si), Al-coated steel case, Ni-coated brass primer cup propellant contains K and S Pb, Sb, Ba primer... 

SPL, S W, round Pb bullet fully coated with plastic (Teflon), Ni-coated brass case... 

SPL+P, W-SUPER-W, round Lubricated unjacketed Pb bullet, Ni-coated brass case and primer cup, brass anvil... 

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