Silicon Nitride (Si3N4)

Why does MSZ have a better high temperature strength than YTZP?

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> Direct Pressure Sintered Silicon Nitride

We've just introduced a new Direct Sintered Silicon Nitride (Si₃N₄) powder-to-part component manufacturing process that provides a high-performance, cost-effective material solution. The material should be of interest to manufacturers looking for a material with a high strength-to-weight ratio, which compares favorably even with metallic nickel-based “superalloys”. The material also exhibits an unusually low coefficient of thermal expansion, which is a useful property for designers working with high temperature applications.

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Property Charts & Safety Data Sheets
Property Charts	Silicon Nitride
Master Ceramics Property Chart	Full Color Printer Friendly - Color Printer Friendly - B&W
Safety Data Sheets	N/A

Materials Property Chart

		Nitrides
	Property	ASTM Method	Units	Silicon Nitride (Si3N4)
General	Crystal Size (Average)	Thin Section	Microns	4
	Color	--	--	Black
	Gas Permeability	--	atms-cc/sec	gas tight <10^-10
	Water Absorption	C 20-97	%	0
	Mechanical	Density	C 20-97	g/cc	3.25
Hardness		Vickers 500gm	GPa (kg/mm²)	15 (1529)
Hardness		--	R45N	83
Fracture Toughness		Notched Beam	MPam^1/2	6
Flexural Strength (MOR) (3 point) @ RT		F417-87	MPa (psi x 10³	900 (130)
Tensile Strength @ RT		--	MPa (psi x 10³)	537 (78)
Compressive Strength @ RT		--	MPa (psi x 10³)	2500 (362)
Elastic Modulus		C848	GPa (psi x 10⁶)	300 (44)
Poisson's Ratio		C848	--	0.28
Thermal	C.T.E. 25 - 600° C	C 372-96	x 10^-6/C	2.9
	Thermal Conductivity @ RT	C 408	W/m K	29
	Max Use Temp	--	Farenheit (°F)	2552
	Max Use Temp	--	Celsius (°C)	1400
Electrical	Dielectric Strength (.125" Thick)	D 149-97A	V/mil	300
	Dielectric Constant @ 1 MHz	D 150-98	--	9.2
	Volume Resistivity, 25°C	D 257	ohms-cm	> 1 x 10¹⁴

Note: The information in this data sheet is for design guidance only. STC does not warrant this data as absolute values. Forming methods and specific geometry could affect properties. Slight adjustments can be made to some of the properties to accommodate specific customer requirements. Most of the dense materials in the table are resistant to mechanical erosion and chemical attack. STC has performed ASTM testing qualification for certain compositions, in accordance with ASTM D2442. Please consult our technical staff for appropriate material and specific test results.

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