Silicon nitride exhaust hood has the advantages of high hardness, stable chemical properties, corrosion resistance, excellent thermal shock resistance, wear resistance, etc., and is used in reactors with drastic temperature changes and corrosive atmospheres.

Silicon nitride Performance

Item

Unit

Si3N4

Type

Gas pressure sintered

Density

g/cm3

3.2-3.3

Color

Black, Grey

Young Modulus

GPa

300~320

Vickers Hardness

GPa

15 – 17

Compressive Strength

MPa

2200

Bending Strength

MPa

600-1000

Thermal Conductivity

W/m.K

20-30

Thermal Expansion

10-6/°C

3.2

Max. Working Temp.

°C

1200

Volume Resistivity

Ω ·cm

> 1014

Dielectric Constant

6

Dielectric Strength

kV/mm

12

Fracture toughness

MPa·m1/2

5.0-7.0

Advantages

-High-temperature resistance, corrosion resistance, no pollution,

-Strong thermal shock resistance, no slag or explosion

-High mechanical strength and easy operation

-High degree of insulation

-Not affected by reducing atmosphere, anti-oxidation, stable performance

Application of the Si3N4 exhaust hoods

-Used in polysilicon reduction furnace

-Used in the photovoltaic industry. It is thermal shock resistant, anti-corrosion, and durable. It can effectively prevent silicon slag and silicon blocks from entering the exhaust pipeline.

Packing

Silicon Nitride exhaust hoods use appropriate outer boxes and internal buffer materials, and some components are also vacuum-packed.