Japan Thermotec co.,Ltd. that contributes to manufacturing such as steel making,cast metal foundry, and conner base alloys making.

Continuous tempersture measuring probes | Protectuve tube(MZ Tube)| Expendable thermocouple |
Japan Thermotec co.,Ltd. that contributes to manufacturing such as steel making,cast metal foundry, and conner base alloys making.

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Various protective tube Product information

This items are various protective tubes which protect thermocouple in a severe environment.

We provide various type protective tubes for thermocouple according to the material and the size in order to use it to measure the temperature under the severe environment such as molten metal and heat treatment furnace. Moreover,we take orders design and manufacturing a temperature sensor which assembles thermocouple, flange, and terminal box. If you consult us, we will design for the sensor and write a written estimate.
※The custom-made product is published on the actual results and the usage pages.

Protective tubes handled

We will select the best material according to the temperature and atmosphere, etc.
Various protective tube lineup Mo-ZrO2、Mo-Al2O3-ZrO2、Mo-Al2O3protective tube
Metallic protective tube (Stainless steel, Inconel, and Cantal and others)
Alumina protective tube (PT-0, PT-1)
Silicon carbide system protective tube (R-SiC, Si-SiC, N-Sic, and pressureless sintering SiC)
Silicon nitride system protection tube (Si3N4 and Sialon)

We take orders design and manufacturing a temperature sensor which assembles thermocouple, flange, and terminal box. If you consult us, we will design for the sensor and write a written estimate.
※The custom-made product is published on the actual results and the usage pages.

What is The Cermet (Mo-ZrO2)?

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The Cermet (Mo-ZrO2) balancedly inosculates metallic molybdenum of high melting point (melting point of Mo is 2,625℃) and zirconia of high-corrosion resistance (melting point of ZrO2 is 2,677℃). It has an excellent characteristic as a protective tube for the continuous temperature measuring probe, because it is sustainable in the temperature of molten metal(steel or cast iron) or in high temperature environment by its excellent heat resistance and corrosion resistance.

Profile
Quick responsivity to the temperature variation.
Responsivity for the temperature variation of the molten metal is excellent because of high thermal conductivity of Mo metal.
The preheating and heat insulation are unnecessary because it is excellent in thermal shock properties. Therefore, its handling is easy.
  • It is possible to dip directly it with no preheating into molten metal of 1,600℃.
  • It is possible to dip the probe heated to 1,600℃ into water.
Actual measuring experience of temperature
  • Blast furnace steelmakers and electric furnace steelmakers ▶ From ultra low carbon steel to high-carbon steel, stainless steel
  • Castiron foundryMetal spout of cupola, grey iron,ductile iron,high chromium cast iron
  • Copper alloy makers ▶ Brass, Bronze
Graph compared material property of Mo and others
Thermal conductivity Thermal shock
Thermal conductivity graf Thermal shock graf
Responsivity for the temperature variation is excellent because of high thermal conductivity of Mo. Because Mo is a metal, the cermet can endure high thermal shock. Therefore it can be used without preheating.

Physical property value

Cermet protective tube

Items Characteristic value
Apparent porosity (%)   0.15
Coefficient of water absorption (%)   0.04
Apparent specific gravity   8.34
Compressive strength (MPa) at R.T. 1043
Bending strength at R.T.
at 1,400℃
342
192
Thermal conductivity (w / m / k) at R.T.
at 1,400℃
41.1
68.1
Coefficient of thermal expansion ( x 10-8 / ℃) at 1,000℃ / 1Hr
at 1,500℃ / 1Hr
7.15
7.63
Various protective tube Product information - END -

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