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Lab talk, the good, the bad, and the ugly
Dental-CAM
Furnace
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<blockquote data-quote="Zubler USA" data-source="post: 271481" data-attributes="member: 6881"><p>SiC (Silicon Carbide) Heating Elements are wired in parallel, have a max temp of about 1600C at the surface of the element, giving the furnaces they heat a max temp af about 1530 to 1540c. This also tends to give them short lives. They are wired in parallel because their resistance changes as they age. However, when one goes out, they have to be changed in pairs or completely.</p><p></p><p>MoSi2 elements come in different grades. They are wired in serial circuits, have max temperatures of 1800 - 1900C at the surface of the element. Furnaces with these elements tend to have max programmable temps between 1600-1700C. They can last much longer than SiC elements when run at temperatures above 1500C. They tend to have more issues with contamination if technicians do not dry their colored/painted zirconia properly and do maintain their ovens properly. </p><p></p><p>Both SiC and MoSi2 elements can contaminate/ be contaminated. </p><p></p><p>1. The first question you need to answer is what temperature do I sinter at the most. </p><p>- If you sinter at 1450 get SiC elements</p><p>- If you sinter at 1540 or higher get MoSi2 elements</p><p>2. The second question you should answer is how good am I about oven maintenance and attention to process detail.</p><p></p><p>Good luck.</p></blockquote><p></p>
[QUOTE="Zubler USA, post: 271481, member: 6881"] SiC (Silicon Carbide) Heating Elements are wired in parallel, have a max temp of about 1600C at the surface of the element, giving the furnaces they heat a max temp af about 1530 to 1540c. This also tends to give them short lives. They are wired in parallel because their resistance changes as they age. However, when one goes out, they have to be changed in pairs or completely. MoSi2 elements come in different grades. They are wired in serial circuits, have max temperatures of 1800 - 1900C at the surface of the element. Furnaces with these elements tend to have max programmable temps between 1600-1700C. They can last much longer than SiC elements when run at temperatures above 1500C. They tend to have more issues with contamination if technicians do not dry their colored/painted zirconia properly and do maintain their ovens properly. Both SiC and MoSi2 elements can contaminate/ be contaminated. 1. The first question you need to answer is what temperature do I sinter at the most. - If you sinter at 1450 get SiC elements - If you sinter at 1540 or higher get MoSi2 elements 2. The second question you should answer is how good am I about oven maintenance and attention to process detail. Good luck. [/QUOTE]
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