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Silicon Nitride Degassing Rotor And Shaft

Silicon Nitride Degassing Rotor and Shaft introduction Silicon nitride rotor includes impeller and shaft. Used in the aluminum and zinc casting industries, nitrogen, argon or carbon tetrachloride are injected and sprayed into molten metal through silicon nitride rotors for dehydrogenation. It...

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Silicon Nitride Degassing Rotor and Shaft introduction

Silicon nitride rotor includes impeller and shaft.

Used in the aluminum and zinc casting industries, nitrogen, argon or carbon tetrachloride are injected and sprayed into molten metal through silicon nitride rotors for dehydrogenation. It can eliminate the bubbles inside the castings and improve their inner quality.  Injects inert gases into the Metallic solution.

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・m1/2

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

Volume Resistivity

Ω・cm

>1014

Heart Shock Resistance

800

Maximum Available Tempereture

1200 

Use of Silicon Nitride Rotor and Shaft for Aluminum Degassing

Silicon nitride degassing rotor for purification of aluminum melting 
Silicon nitride rotor includes impeller and shaft.

To remove H2 gas from molten aluminum, a silicon nitride/si3n4 pipe is used to feed the N2 or Ar gas. As silicon nitride rotor is used to stir and disperse the gas throughout the molten bath. 

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