Superheat for pouring Cerrotru (Mp=281*F (eutectic))
Superheat for pouring Cerrotru (Mp=281*F (eutectic))
(OP)
I am going to pour a Silicon RTV mold with Cerrotru. This is a Bi-Sn eutectic, with the Mp@281*F. The shape is approximately a hollow cylinder enclosing around 160in^3. Should be 50lbs + gates/risers of metal.
I didn't design the mold, its not optimal. Though it should work. There is one spot where I'm worried about a cold shut. I want to get enough superheat to fully fill the mold, but also dont want to wait all night for shakeout....
Thanks for any tips and tricks... I studied GCI Casting in grad school, so I have some experience with casting, however there is a huge difference btw pouring a melt at 2600F vs 300F, also RTV is a bit different than green sand.
I didn't design the mold, its not optimal. Though it should work. There is one spot where I'm worried about a cold shut. I want to get enough superheat to fully fill the mold, but also dont want to wait all night for shakeout....
Thanks for any tips and tricks... I studied GCI Casting in grad school, so I have some experience with casting, however there is a huge difference btw pouring a melt at 2600F vs 300F, also RTV is a bit different than green sand.
Nick
I love materials science!





RE: Superheat for pouring Cerrotru (Mp=281*F (eutectic))
Remember that that these alloys are very poor heat conductors so if you start with enough metal to make a continuous pour I don't see a problem. We cast some very intricate parts of about half your size with no problems.
Depending on the mold composition you might be able to do a little preheat.