Silicon Nitride Thermocouple Protection Tube

Silicon nitride thermocouple protection tube ISO 9001:2000 Longer working life High thermal stability antioxidant ability Super JINYU silicon nitride thermocouple protection tube ceramic material with high thermal stability ,antioxidant ability,and product size excellent performance. Have been thru ISO 9001:2000. 

Reaction bonded silicon nitride tube is made by direct nitridation of a compacted silicon powder, and because of the difficulty of ensuring complete reaction; it is hard to achieve a high component density.  Usual densities are in the range 2.3 – 2.5g/cm3 compared with 3.29g/cm3 for gas pressured sintered silicon nitride.  The higher density gives the HPSN, SSN & GPS-SSN materials better physical properties and means they are used in more demanding applications at very high temperature, especially for non-ferrous molten metal handling and thermocouple sheaths.  The nitridation produces only a small volume change, which means that RBSN components do not need to be machined after fabrication and complex near net shapes can be produced in a single process stage.

Key Properties

Applications exploit the following properties of silicon nitride

low density

high temperature strength

superior thermal shock resistance

excellent wear resistance

good fracture toughness

mechanical fatigue and creep resistance

Excellent non-wetting property with good oxidation resistance

Property	SSN        GPS-SSN         HPSN        RBSN
Density (g.cm-3)	3.28            3.30               3.23           2.5
Young’s Modulus (GPa)	285              320                315           189
Bend Strength (MPa)	675              750                850           440
Fracture Toughness K1c  (MPa.m0.5)	6                   7                    8             2.5
Hardness (GPa)	16                 16                  16           7.2
Thermal Expansion Coefficient  (x 10-6/°C)	3.2               3.2                 3.2           3.2
Thermal Conductivity (W/m.K)	25                 30                  30            14
Maximum Temperature (°C) for application Dielectric Constant Abrasive Wear resistance Parameter	1150            1150              1150         1100 9                     9                   9            7.5 1110            1130              1120          360

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Silicon Nitride Thermocouple Protection Tube