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Thermocouple Ceramic Insulators
Max. Use Temp. : 900-2,000 ℃
Density : 2.00-3.90 g/cm3
Electrical Insulation : Excellent
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Product Introduction
The structure of the thermocouple mainly includes three main parts: the hot electrode, the protection tube and the insulator. As an insulator, thermocouple ceramic insulators can be used to prevent two hot electrodes from short-circuiting. The material choice of thermocouple insulator depends on the operating temperature range and the requirements for electrical insulation performance. Commonly used ceramic materials are Steatite, Aluminum Oxide (95% Al2O3 and 99% Al2O3) and Boron Nitride. The cost of these materials is also quite different, namely Steatite < Alumina < Boron Nitride. Multi bore ceramic tube as insulator for thermcouple is generally round or elliptical, with holes in the middle (conventional single hole, double holes and four holes). The length should be determined according to the length of the hot electrode, and multiple ones can be used in series. As an insulator, ceramic beads for thermocouple generally has the characteristics of electrical insulation, high temperature resistance, oxidation resistance and good stability.
Properties of Ceramic Insulator for Thermocouple
ITEM | UNIT | Alumina | A950 | Alumina | A990 | Boron Nitride | BN-2000 |
PHYSICAL | ||||
Main Content | - | 95% Al2O3 | 99% Al2O3 | 99% h-BN |
Color | - | White | Ivory | White |
Water Absorption | % | 0 | 0 | 1.0-1.5 |
Density | g/cm3 | 3.65 | 3.85 | 2.00-2.10 |
Gas Permeability | - | Gas Tight | Gas Tight | No |
MECHANICAL | ||||
Compressive Strength (20℃) | Mpa | 2,200 | 2,500 | 30 |
Tensile Strength (20℃) | Mpa | 270 | 300 | 2.3 |
Flexural Strength (20℃) | Mpa | 310 | 360 | 55 |
Young’s Modulus | Gpa | 370 | 390 | 665 |
THERMAL | ||||
Thermal Conductivity (20℃) | W/m.K | 25 | 30 | 35 |
Maximum Service Temperature | ℃ | 1,500 | 1,700 | 950 / 2,000 |
Coefficient of Thermal Expansion (25 - 1,000 ℃) | 10-6/K | 7-9 | 7-9 | 1.5 |
Thermal Shock Resistance | △T(℃) | 210 | 230 | >1,200 |
ELECTRICAL | ||||
Dielectric Constant | 1 MHz | 8 | 9 | 4.0 |
Dielectric Strength | KV/mm | 15 | 17 | 370 |
Volume Resistivity | Ω·cm | >1014 | >1014 | >1014 |
Note: Although we have no reason to doubt the accuracy of the data presented, this information is offered for comparison only. Exact properties will vary depending on the manufacturing method and part configuration, and can sometimes be tailored to meet specific requirements.
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