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Si3N4 Thermocouple Protection Sheath

Si3N4 Thermocouple Protection Sheath Introduction As the necessary means of measuring temperature, thermocouple protection tubes are applicable in metallurgical industry, such as aluminum, tin, lead, zinc etc. Charcteristics of silicon nitride riser tube The advantages are 1.Si3N4 material has...

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Si3N4 Thermocouple Protection Sheath Introduction

As the necessary means of measuring temperature, thermocouple protection tubes are applicable in metallurgical industry, such as aluminum, tin, lead, zinc etc.

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Charcteristics of silicon nitride riser tube

Item

Material

Unit

Silicon Nitride

Bulk density

g/cm3

3.2

Water absorption

%

0

Flexural strength

MPa

750

Young's Modulus of Elasticity

Gpa

280

Fracture Toughness

MPa・m 1/2

6.5

Poisson's Ratio

_

0.28

Vickers Hardness

Gpa

13

Coefficient of Linear Thermal   Expansion

×10-6/℃

3.4

Thermal Conductivity

W/(m・k)

30

Specific Heat

J/(g・k)

0.65

The advantages are

1.Si3N4 material has better thermal shock resistance and high-temperature mechanical strength, light weight, high strength and easy to operate. It will not burst even if exchange is done in the course of processing, making it easy for production and maintenance.

2.Si3N4 material has the low conductive advantage. Its low specific heat minimizes loss of heat. This will be conducive to achieving the accuracy of temperature measurement for the thermocouple protection tube.

3.Molten aluminum’s low wettability prevents stick of slagging in the tube, thus easy to maintain and operate.

4.Si3N4 has excellent corrosion resistance and wear resistance, and ensure longer working life. If proper maintenance, the actual using life can be up to 2-3 years.

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