Silicon Nitride (Si3N4) Properties and Applications

Material:	Silicon Nitride (Si3N4) Properties and Applications
Composition:	Si3N4

Property	Minimum Value (S.I.)	Maximum Value (S.I.)	Units (S.I.)	Minimum Value (Imp.)	Maximum Value (Imp.)	Units (Imp.)
Atomic Volume (average)	0.0058	0.006	m³/kmol	353.938	366.142	in³/kmol
Density	2.37	3.25	Mg/m³	147.954	202.891	lb/ft³
Energy Content	150	200	MJ/kg	16250.8	21667.7	kcal/lb
Bulk Modulus	120	241	GPa	17.4045	34.9541	10⁶ psi
Compressive Strength	524	5500	MPa	75.9998	797.708	ksi
Ductility	0.00031	0.00169		0.00031	0.00169	NULL
Elastic Limit	60	525	MPa	8.70226	76.1448	ksi
Endurance Limit	44	470	MPa	6.38166	68.1677	ksi
Fracture Toughness	1.8	6.5	MPa.m^1/2	1.63808	5.9153	ksi.in^1/2
Hardness	8000	30500	MPa	1160.3	4423.65	ksi
Loss Coefficient	2e-005	5e-005		2e-005	5e-005	NULL
Modulus of Rupture	181	1050	MPa	26.2518	152.29	ksi
Poisson's Ratio	0.23	0.28		0.23	0.28	NULL
Shear Modulus	65.3	127	GPa	9.47096	18.4198	10⁶ psi
Tensile Strength	60	525	MPa	8.70226	76.1448	ksi
Young's Modulus	166	297	GPa	24.0763	43.0762	10⁶ psi
Glass Temperature			K			°F
Latent Heat of Fusion	930	1550	kJ/kg	399.826	666.377	BTU/lb
Maximum Service Temperature	1346	1773	K	1963.13	2731.73	°F
Melting Point	2661	2769	K	4330.13	4524.53	°F
Minimum Service Temperature	0	0	K	-459.67	-459.67	°F
Specific Heat	673	1100	J/kg.K	0.520807	0.851244	BTU/lb.F
Thermal Conductivity	10	43	W/m.K	18.7203	80.4974	BTU.ft/h.ft².F
Thermal Expansion	1.4	3.7	10^-6/K	2.52	6.66	10^-6/°F
Breakdown Potential	16	20	MV/m	406.4	508	V/mil
Dielectric Constant	9.5	10.5		9.5	10.5	NULL
Resistivity	1e+016	1e+021	10^-8ohm.m	1e+016	1e+021	10^-8 ohm.m

Environmental Properties
Resistance Factors 1=Poor 5=Excellent
Flammability	5
Fresh Water	5
Organic Solvents	5
Oxidation at 500C	5
Sea Water	5
Strong Acid	4
Strong Alkalis	3
UV	5
Wear	5
Weak Acid	5
Weak Alkalis	5

porousceramic