Thanks for the point it out !
I've checked alloys thermal conductivity for
B169 C61400 & B171 C63000.
K=~57 W/mK for C61400 and K=~37 W/mk for
Therefore, it is too low (Compared with SB-187,
K=~380). For 100% contact case, it is still ok. But for 50% contact, the
temperature is too high ~1100 K due
to the lower conductivity. Therefore,both c61400
and c63000 is NOT suitable due to its thermal conductivity, even it has a
high strength at the elevated temperature.
So, I'm check othere possible
1) One of them is C19400__high strength modified
copper Cu=2.35 Fe-0.3P-0.12 Zn. Please check ! it has a 18 ksi yield strength at
(500 F) and K=260 W/m K for the conductivity.
It is somewhere between C6xxxxx and C102XXX
for its conductivity and strength. I'm checking it and will keep all of
you posted soon.
2) or we could make a bi-metal type for the
top plate: maybe 0.5" for the c61400 for strength requirement and 0.5" for
C102XX(pure copper) for the heat desserpation reason. (then, we have both high
strength and conductivity. I did not know it will
work or not yet. How do we/you make there two piece copper together with a
good bond ?
3) Rob: if you could talk to some venders cand
see if with some special temper, we could get higher strength at an
elevated temperature like yield stress=25 ~30 ksi at T=400-500 F for C102XXX
type copper. ASME Table Y gives
much high yield strenght , Sy~30 ksi for (T=400F) for smls pipe with H80 temper
(SB-42,SB-75, SB111) for C10200? If we could get it for the plate,that will be it!
4) other? active cooling ?
let's one at time, I'll update you for # 1
----- Original Message -----
Sent: Thursday, April 08, 2010 8:12 AM
Subject: Re: Copper Alloys
> Hi Rob,
> I'll checking into it and get it back to
> ----- Original Message -----
"Rob Reilly" <email@example.com>
"Ang Lee" <firstname.lastname@example.org>
"Lawrence J Allen" <email@example.com>; "Fernanda G
Wednesday, April 07, 2010 4:59 PM
> Subject: Copper Alloys
>> Looking up alloys B169 C61400 & B171
C63000, I see they have increased
>> amounts of Al, Ni & Fe. Does
the addition of these elements change the
>> thermal conductivity
significantly from B187 C11000? Should the FEM take
>> this into
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