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Insulation Materials for High Temperature Thermocouple | |||
|
Material |
Upper Service Temperature |
Melting Point |
Remarks
|
|
Alumina (Al2O3) |
3450° F (1900° C) |
3686° F (2030° C) |
High-purity aluminum oxide is the standard insulation material supplied for Conax Buffalo high temperature thermocouple assemblies. Alumina offers high thermal conductivity and high electrical resistivity. |
|
Hafnia (HfO2) |
4352° F (2400° C) |
5054° F (2790° C) |
Hafnium oxide is usually present in zirconium ores in amounts ranging from .5 to 2 percent. Refined high-purity hafnia offers a higher electrical resistivity at elevated temperatures than yttria or zirconia. Hafnia’s resistivity is comparable to that of beryllium oxide, but hafnia does not present the potential health problems associated with beryllium oxide. Hafnia is therefore replacing beryllium oxide in many applications. Hafnia is the commonly recommended insulation for Conax Type C thermocouples. |
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출처 : (주)다일아이비씨 www.dailibc.com 초고온용 열전대 ( 초고온용 써모커플 ) | |||
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Other Insulation Materials | |||
|
Material |
Chemical Symbol |
Melting Point |
Remarks |
|
Beryllium Oxide |
BeO |
4200° F (2315° C) |
High electrical resistivity, toxic dust, special handling required |
|
Magnesium Oxide |
MgO |
2500° F (1370° C) |
Used primarily with compacted sheathed thermocouples |
|
Thorium Oxide |
ThO2 |
4532° F (2500° C) |
Low electrical resistivity, good resistance to reducing environments |
|
Yttrium Oxide |
Y2O3 |
3632° F (2000° C) |
Low electrical resistivity, stabilizer material for zirconium |
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출처 : (주)다일아이비씨 www.dailibc.com 초고온용 열전대 ( 초고온용 써모커플 )
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