Hydrogen gas can be purified by diffusion through a palladium sheet. If the concentrations on the two sides of a 5-mm-thick palladium sheet are 2.4 and 0.6 kg/m3, and steady-state conditions have been attained, compute the mass of hydrogen, in kgper hour, that passes through the palladium sheet at 500
C. The diffusion coefficient of hydrogen in palladium is 1.0 x 108m2/s and the surface area of the palladium sheet is 0.50 m2.2.Consider the gas carburizing of a gear of 1018 steel at 927
C. Calculate the time necessary to increase the carbon concentration to 0.35 wt% at 0.40 mm below the surface of the gear.The gas mixture contains a constant 1.15 wt%C.3.
A gear made of 1020 steel is to be gas carburized at 930
C. What is the carbon concentration at 0.95 mm below the surface of the gear after 8.0 hours of carburizing time? Iron is phase (FCC) at 930
C. The gas mixture contains 1.25 wt% C.4.A 1045 steel will be heat treated in air at 900
C. What is the carbon concentration at 0.4 mm below the surface after 6 hours?5.
At approximately what temperature would a specimen of -iron have to be carburized for 2 hours to produce the same diffusion result as at 900 C for 15 hours
