ADVANCED CERAMICS Pressure Assisted Densified (“PAD”) Silicon Nitride (Si3N4) is a fine grained, ceramic material having exceptional thermal and mechanical properties. ADVANCED CERAMICS produces three grades of “PAD” Si3N4 with diameters up to 560µm. ADVANCED CERAMICS NSG is a very fine grain Si3N4 with exceptionally high strength and good corrosion resistance. It is appropriate for demanding structural and wear resistant applications.

ADVANCED CERAMICS CI is a high strength Si3N4 with excellent high temperature mechanical properties. This material is excellent for wear and cutting tool applications. ADVANCED CERAMICS SC-2 is high purity Si3N4 appropriate for the semiconductor industry. The following chart lists typical properties.

	Grade of PAD Si3N4		SC-2	NSG	CI
	Bulk Density (min)	g/cmˆ3	3.17	3.25	3.30
	Average Grain Size	µm	1-2	0.6	0.5
	Flexural Strength, (4-Pt MOR) @RT	Ksi MPa	92 640	130 900	123 850
	Characteristic Strength	MPa	675	930	865
	Flexural Strength, (4-Pt MOR) 1000° C	Ksi MPa	-	-	115 810
	Weibull Modulus (m)		9	10	12
	Elastic Modulus (E)	GPa	320	300	310
	Poisson's Ratio (n)		0.27	0.27	0.27
	Hardness (Knoop 0.3 kg)	kg/mmˆ2	1650	1450	1500
	Fracture Toughness (Chevron Notch)	MPa-mˆ1/2	4.9	5.5	6.0
	Thermal Expansion (RT-1000° C)	10-6/°C	3.3	3.3	3.3
	Thermal Conductivity @RT	(W/m-K)	30	20	30
	Electrical Resistivity		>10ˆ14	>10ˆ14	>10ˆ14