Silicon Nitride (Si₃N₄)

Characteristics

Item

Value

Unit

Mechanical Characteristics

Colour

Gray/Black

Density

3.2

g/cm³

Bending Strength

750

MPa

Compressive Strength

3,800

MPa

Elastic Modulus

290

GPa

Fracture Toughness

6.7

MPam^1/2

Weber Coefficient

15

M

Vickers Hardness

1,700

HV0.5

Thermal Characteristics

Coefficient of Line Thermal Expansion

2.8

10^-6K^-1

Thermal Conductivity

20

W/mK

Thermal Shock Resistance (Put in Water)

750

?T°C

Max Working Temperature

1,300

°C

Electrical Characteristics

Volume Resistance at 20°C

>10¹⁴

?cm

Dielectric Strength

10×10⁶

V/m

Dielectric Constant

-

ε_r

One MHZ Dielectric Loss Angle at 20°C

-

tanδ

Chemical Characteristics

Nitric Acid (60%) 90°C

1

WTLossmg/cm²/day

Sulphuric Acid (95%) 95°C

≒0.00

Caustic Soda (30%) 80°C

0.2