J
Janine Harris
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Hi
I am casting using a CoCr base alloy (Dsign30) for the first time. Usually I use a high content gold alloy, lower melting point etc, etc.... but I cant seem to cast the metal!
Its been a long time since Ive cast with non precious and I tried twice so far:
825 burnout, with crucible in oven, remove crucible, drop in ingot, use 10PSI LPG and 40PSI O2.
This just melted into a blob with a lot of oxide.
Second 875 burnout with crucible in oven, with 20PSI LPG and 50PSI O2. Hardly melted the alloy and it just stuck to the exit hole in the crucible.
How hot does it have to be and how long should I be melting the alloy for? Using a centrifugal casting machine. Thanks
I am casting using a CoCr base alloy (Dsign30) for the first time. Usually I use a high content gold alloy, lower melting point etc, etc.... but I cant seem to cast the metal!
Its been a long time since Ive cast with non precious and I tried twice so far:
825 burnout, with crucible in oven, remove crucible, drop in ingot, use 10PSI LPG and 40PSI O2.
This just melted into a blob with a lot of oxide.
Second 875 burnout with crucible in oven, with 20PSI LPG and 50PSI O2. Hardly melted the alloy and it just stuck to the exit hole in the crucible.
How hot does it have to be and how long should I be melting the alloy for? Using a centrifugal casting machine. Thanks