Properties of Silicon Nitride （Si3N4) Ceramics

Properties of Silicon Nitride （Si3N4) Ceramics
Item	Unit	Typical Values
Physical Properties
Density	g/cm3	3.2
Mechanical Properties
Moh’s hardness	Grade	9
Rockwell Hardness	HRA	90
Vickers Hardness (Hv50)	HV0.5	＞1550
Modulus of Elasticity	Gpa	290
Flexural Strength	Mpa	＞600
Compressive Strength	Mpa	2500
Fracture toughness	Mpam1/2	＞6.0
Thermal Properties
Maximum use temperature	°C	1200
Thermal Conductivity	W/(m.k)	15-20
Thermal Expansion Coefficient	10-6/°C	＞3.1
Thermal Shock Resistance	△T°C	500
Specific Heat Capacity	KJ/kg.K	700
Electrical Properties
Dielectric Strength	KV/mm	15
Dielectric Constant	Er
Volume Resistivity at 20°C	Ω.cm	1.0X1012