Could anyone tell me the latent heat of fusion and vapourisation of
Better still, where can I find such data. The net has proved futile and
most databooks Ive referred to dont have this particular piece of
Collected tables for a wide variety of alloys is not trivial to find.
I'm sure there is one in a library somewhere, but in the mean time I
found that "brass" (No exact composition, but I can only assume that
simply brass would refer to 33%zinc or at least give a number that is in
the ballpark) has a latent heat of 168kJ/kg. This number was taken from:
"Engineering Formulas" by Kurt and Reiner Gieck, 7th Edition
I just had it laying around, but it didn't have a very extensive table.
Just in case you didn't know, if you can find either the heat of
vaporization or the heat of sublimination you can calculate the
remaining heat. (Hfusion + Hvaporization = Hsublimination)
I did check the ASM handbook. But Im not very thorough in Chemistry.
Could you tell me how to determine the latent heats from a Phase
diagram (I thought it could only provide the melting points of the
material at different compositions).
PS: I need the latent heat of vapourisation too. Would the phase
diagram help to determine that too.
Well, lines on a phase diagram correspond to equality between chemical
potentials. They in turn could be related to enthalpies.
You can start with the simplest case: vaporization of a one-component
system. Then the saturated pressure is related to enthalpy as
ln p = - DelH/RT + DelS
Similar but more compilcated equations could be written for
multi-component phase diagrams.
The best way is to use specialized databases with Gibbs energies, see
for example Thermocalc (unfortunately not free). Provided your system
is included you can obtain on-line complete information including phase
diagrams and all thermodynamic properties.
You can find some background info and references in the manual of my
software for computational thermodynamics