Silicon nitride crucible is sintered by gas pressure sintering, it has good resistance to acid and weak alkaline corrosion, such as boiled hydrochloric acid, concentrated nitric acid, aqua regia, sulfuric acid, sulfuric acid, and aluminum hydroxide solution with a concentration below 25%. This dense silicon nitride has excellent oxidation resistance and can be used stably in an oxidizing atmosphere below 1400°C. Silicon nitride material also has good stability to metal melts and is not wetted, such as molten metals zinc, gold, silver, aluminum, cadmium, indium, lead, bismuth, gallium, germanium, etc. and their alloys such as yellow copper, hard aluminum, nickel silver, etc. all have good corrosion resistance.

Silicon nitride ceramic crucible has ultra-high hardness, lubricity, strong wear resistance, and can resist the effects of heat and cold.

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

*Tested at room temperature

*The above information is for comparison only. The exact characteristics will vary depending on the manufacturing method.

Typical properties of silicon nitride ceramics

-High strength over a wide temperature range

-High fracture toughness

-High hardness

-Excellent wear resistance

-Low thermal expansion and high thermal conductivity

-Good thermal shock resistance

-Good chemical and oxidation resistance

Packing

Silicon nitride crucibles use appropriate outer boxes and internal buffer materials, and some components are also vacuum-packed.