Silicon Nitride Thermocouple Protection Tube

Purity Silicon nitride thermocouple protection tube CE certificate Long life High thermal stability Beautiful surface Firstly, our tube is silicon nitride thermocouple protection tube, not Silicon nitride (Si3N4) bonded silicon carbide (SiC), now, we introduce the 2 material for your. SiC bonded Si3N4 material is produced by adding industrial silicon paste into artificial aggregate. Under high temperature, Si and N2 reacts with the formula of 2N2+3Si=Si3N4, Si3N4 bonded Sic material is formed by bonding SiC particles tightly. Therefore, Si3N4 bonded SiC material is an excellent refractory with the original properties of SiC. The material has quite high strength even under the temperature of 1700.C has properties of creep deformation resistance and anti-chemical erosion, and has excellent thermal conductivity and wear-resistance. Comparing with other several bonded SiC materials, Si3N4 bonded SiC material has attracted more and more attention.  Si3N4 Bonded SiC material is mainly used in the production of aluminum, copper and zinc , as the lining material of the molten pool and electrolytic bath (reduction bath). The side lining of the reduction bath is eroding by aluminum and cryolite (used as additive), but Si3N4 bonded SiC material could not be eroded by aluminum, and do not have chemical reaction with cryolite. So this kind of material is ideal for the lining bricks of the electrolytic bath. In particular this kind of bricks have the excellent properties of high strength, abrasive resistance and nonconductive, so the copolymer (Al2O3 and Cryolite). The copolymer likes protective film to protect the working lining and improve the service life of electrolytic bath. At the same time, the Si3N4 bonded SiC bricks have lower thermal conductivity than silicon bricks, so they can reduce the thickness of the side wall or input higher power to expanse the loading capacity of the electrolytic bath, and to increase the output. Because of the high resistivity of the material, it can reduce the power consumption of the side -wall about 15%, saving energy and protecting environment 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