I am wanting to cast frit in a steel tube that is 3.5" in diameter and either 12" or 24" tall. I will line it with 1/4" fiber board and a layer of thin fire. I have done small scale tests to find out what my target temperature should be to get the finish that I want.
Currently, at .875" w x 2" h I use this schedule:
300/hr 1000 :30
300/hr 1375 :20
AFAP 900 1:30
100/hr 700 :00
Now, I know with a thicker mass, I will need to slow down that cooling cycle quite a bit. Should I use the annealing schedule for thick slabs? And, should I slow my ramp up?
Here is a photo of my latest test: