Silicon nitride ceramic components

silicon nitride ceramic insulator ring (2)

Silicon nitride is optimal for engine parts due to its toughness at high temperatures, superior thermal shock resistance, light weight and corrosion resistance.

Categories: Silicon nitride ceramics Tags: Silicon nitride ceramic

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Silicon nitride ceramic components

Product Description

Silicon Nitride has good high temperature strength, creep resistance and oxidation resistance, Silicon Nitride offers the low
thermal expansion coefficient gives good thermal shock resistance compared with most ceramic materials.Silicon nitride is sintered
at high temperature( around 2000℃） and highly densified . Compared to silicon carbide, silicon nitride has better mechanical
strength and thermal shocking resistance. It also posses excellent electrical insulating property, wear resistance and corrosion
resistance

The prime features of Si3N4 ceramic
1.Low density: 3.2 g/cm³with lightweight than most other technical ceramics
2. Superior hardness, it’s one of most hardest technical ceramic than others
3. Great wear resistance due to its exceptional hardness and self-lubricity
4. Low coefficient of thermal expansion and high thermal conductivity (20 W/m.k)
5. Great thermal shock resistance, it’s up to 1000ºC under the special atmosphere
6. High mechanical strength and well resistance to impact than other advanced ceramics
7. Heat & high-temperature resistance, The max. service temperature can be up to 1300ºC
8. Chemical and corrosion resistance, resistant to almost all inorganic acids and many organic acids
9. At the same time, Silicon nitride is a high-performance electrical insulation material

Properties of Silicon Nitride (Si3N4)
Very low density
High wear resistance and corrosion resistance
High temperature resistance
Good flexural strength and high fracture toughness
Very good thermal shock resistance
Dimensional stability and aging resistance
Excellent sliding properties (tribology)
Biocompatibility (for use in hygiene and the food and beverage industry)

Datasheet of Technical ceramics

Property	Unit	Material
Property	Unit	Si3N4	99.5% Al2O3	99% Al2O3	96% Al2O3	ZrO2
Density	g/cm³	≥3.20	≥3.90	≥3.85	≥3.65	≥6.0
Water absorption	%	–	0	0	0	0
Hardness	HV	–	1700	1700	1500	1300
Flexural strength	Mpa	≥600	≥379	≥338	≥320	≥1200
Compressive strength	Mpa	≥2500	≥2240	≥2240	≥2000	≥1990
Fracture toughness	Mpa m^1/2	6	4-5	4-5	3-4	6.5-8
Max. service temperature	ºC	1200	1675	1600	1450	1000
Coefficient of thermal expansion (CTE)	1×10 ^-6/ºC	3.2	6.5~8.0	6.2~8.0	5.0~8.0	8.0~9.5
Thermal shock	T(ºC)	≥600	≥250	≥200	≥220	≥300
Thermal conductivity(25ºC)	W/m.k	20	30	29	24	3
Volume resistivity	ohm.cm
25ºC		–	>1 x 10¹⁴	>1 x 10¹⁴	>1 x 10¹⁴	>1 x 10¹¹
300ºC		–	1 x 10 ¹²	8 x 10¹¹	10¹² -10¹³	1 x 10 ¹⁰
500ºC		–	5 x 10 ¹⁰	2 x 10⁹	1 x 10⁹	1 x 10⁶
Insulation strength	KV/mm		19	18	18	17
Dielectric constant(1Mhz)	(E)	6	9.7	9.5	9.5	29

Related Products of Silicon Nitride (Si3N4):
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Ceramic Rollers and Guide Elements
Ceramic Forming Rings and Large Components
Ceramic Rollers and Drawing Cones
Ceramic Bearing Rollers
Centering Pins
Ceramic Inserts
Ceramic Nozzles
Components for Pumps and Valve

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