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Lab talk, the good, the bad, and the ugly
Dental-CAD
WIC 300-315 Envisiontec
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<blockquote data-quote="TECHARTISAN" data-source="post: 41373" data-attributes="member: 1289"><p>Its a platinum burnout cycle....I probably should have abbreviated....My post seemed long so I just pasted from one of my files....</p><p></p><p>The critical portion is the first two steps...</p><p>Raise temp to 150ºC (300ºF)</p><p>5ºC per min</p><p>Hold for 3 hours</p><p></p><p>The hold time is necessary when casting medium trees....for smaller castings you can reduce the time....but too short and youll find cracking an issue....so it takes some experimenting.</p><p></p><p>Raise temp to 370ºC (700ºF)</p><p>5ºC per min</p><p>Hold for 2 hours</p><p></p><p>I find that lower hold time here to be undesirable....but again it depends largely on the overall mass of your castings and the investment.</p><p></p><p>After that its dependent on your particular investment. </p><p></p><p>In my experience the worst casting issues are caused by speedy temperatures....but Ive read rumors that your a real oven juggler...so maybe you have some tricks Ive not had luck with...I have one large burnout with a computer controller I use for an entire "casting day"....so my methods may be madness for the average end user.</p></blockquote><p></p>
[QUOTE="TECHARTISAN, post: 41373, member: 1289"] Its a platinum burnout cycle....I probably should have abbreviated....My post seemed long so I just pasted from one of my files.... The critical portion is the first two steps... Raise temp to 150ºC (300ºF) 5ºC per min Hold for 3 hours The hold time is necessary when casting medium trees....for smaller castings you can reduce the time....but too short and youll find cracking an issue....so it takes some experimenting. Raise temp to 370ºC (700ºF) 5ºC per min Hold for 2 hours I find that lower hold time here to be undesirable....but again it depends largely on the overall mass of your castings and the investment. After that its dependent on your particular investment. In my experience the worst casting issues are caused by speedy temperatures....but Ive read rumors that your a real oven juggler...so maybe you have some tricks Ive not had luck with...I have one large burnout with a computer controller I use for an entire "casting day"....so my methods may be madness for the average end user. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Dental-CAD
WIC 300-315 Envisiontec
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