Graphite crucible breaking down quickly

Discuss casting techniques
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Joined: Sun Jan 24, 2016 12:11 am

Re: Graphite crucible breaking down quickly

Postby Chalamba » Fri Dec 15, 2017 4:05 pm

Depends on cooling cycles the most. If you cast like 3-5 flasks at a time, 20 castings will do with one cruicable.
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Posts: 127
Joined: Wed Nov 25, 2015 5:49 am

Re: Graphite crucible breaking down quickly

Postby Wdshea » Mon Feb 12, 2018 12:30 am

we get our flasks from Rio. 10 cycles sounds about right.

i don't heat the flask to melting temp. i start off ~200* above whatever the melter is reading, for instance:

Temp 75*
i set it to 275*

then temp overshoots to 450*
setpoint -> 650*

then SP -> 850*

and so on till i get to melting temp.

i have achieved longer life using this method. eventually, the top of the crucible which i grab with "tongs" wears thin, so i use a drimel tool to cut a groove to prevent the tongs from slipping off. learned that the hard way.

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