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PBN Crucibles for Precision Application

Pyrolytic Boron Nitride Crucible can withstand high temperatures in a high vacuum environment. It has excellent thermal conductivity, corrosion resistance, and electrical resistance.

Silicon Nitride (Si3N4) Ceramics

Silicon nitride (Si3N4) is a high-melting-point ceramic material that is extremely hard and relatively chemically inert. The material is prepared by heating powdered silicon between 1300 °C and 1400 °C in an atmosphere of nitrogen. Then the powder of silicon nitride can be sintered to the designed shape.

As one of the most thermodynamically stable technical ceramic materials with high hardness as well, silicon nitride ceramic is ideal for bearing parts, especially for those required to work at high speed and high temperature.

Further Reading: An Overview of Silicon Nitride Ceramics

Silicon Nitride Properties:

Excellent thermal shock resistance
High fracture toughness
Resistant to impacts and shocks
Resistant to high temperature, wear and oxidation

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Silicon Nitride Ceramic Specification

Color	Gray and Gray-black
Density	3.2~3.25 g/cm3
Hardness	HRA 92~94
Highest Operating Temperature	1300 ~1600 ℃
Thermal Conductivity	23-25 W.(M.K)-1
Bending Strength	≥ 900 Mpa
Fracture Toughness	6~8 (Mpa.m1/2)
Thermal Expansion Coefficient (at 0~1400℃)	2.95~3 ×10-6/℃

Silicon Nitride Ceramic Types

Reaction-Bonded Silicon Nitride (RBSN)
Hot Pressed Silicon Nitride (HPSN)
Sintered Reaction-Bonded Silicon Nitride (SRBSN)
Gas Pressure Sintered Silicon Nitride (GPSN)
Sintered Silicon Nitride (SNN)

Silicon Nitride Ceramic Application

Si3N4 bearing balls have already been applied in automobiles, rockets high-speed engines, equipment working in a corrosive environment, and some performance model cars. Compared with steel, high-performance ceramic balls have better mechanical properties under high temperatures and could survive most corrosive chemicals.

Silicon nitride has also been used in high-temperature applications. It was considered as one of the few monolithic ceramic materials that could survive the severe thermal shock and thermal gradients generated in hydrogen-oxygen rocket engines.

ACM Ceramic Product Video

Your Si3N4 Ceramics Supplier

Advanced Ceramic Materials is a leading supplier of silicon nitride ceramic products of the highest quality for a wide range of applications. We are happy to provide advice on materials, design, and application. Feel free to contact us for any questions about Si3N4 or other ceramic materials that are not listed on the website.

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FAQs

Q: What Are the Different Types of Silicon Nitride?

Reaction-Bonded Silicon Nitride (RBSN) Hot Pressed Silicon Nitride (HPSN) Sintered Reaction-Bonded Silicon Nitride (SRBSN) Sintered Silicon Nitride (SNN) Further Reading: 4 Types of Silicon Nitride Ceramics

Q: What Are the Good Properties of Silicon Nitride Ceramics?

A: They are high-quality materials with remarkable hardness and impact resistance. These materials maintain high strength over a large temperature range. In addition, silicon nitride ceramics have a high melting point and are chemically inert.

Q: What Is Si3N4 Materials Used For?

A: Medical Field - Silicon nitride ceramics are usually thermodynamically stable. This makes them ideal for the medical field because it means they do not change when sterilized in an autoclave repeatedly. Medical instruments are usually sterilized in an autoclave to prevent infection. Jewelry - Silicon nitride has a natural gray color, unlike other ceramics that are white. This means that silicon nitride ceramics do not have to be painted while making jewelry. Their grey color usually looks aesthetically appealing. Cutting Tools - They are durable cutting tools due to their high wear resistance and high Weibull modulus. Ball Bearing - Silicon nitride ball bearings have become even more popular than steel ball bearings due to their high thermal shock resistance. Silicon nitride ceramics can function efficiently at extremely high speeds thanks to their wear resistance.

Q: Is Silicon Nitride Conductive?

A: No. In the structure of silicon nitride material, there is no channel for electron transfer, so it cannot conduct electricity. Silicon nitride is an excellent material for making electrical insulators, fully resistant to charge propagation across short lengths and material cross-sections. Comparing to other conventional insulator materials, Si3N4 electrical insulator has higher strength and thermal shock resistance, which is also an ideal insulator for aerospace applications.

Q: Where Can I Get High Quality Si3N4 Ceramic?

A: Advanced Ceramic Materials (ACM) is a global ceramic supplier which has more than 20-year experience in this industry to meet our customers' R&D and production needs. You can reach our sale team via the inquiry page, or email [email protected].

Properties

Chemical Formula	Si3N4
Mechanical
Density	3.26 g/cm3
Hardness	14 GPa
Modulus of Elasticity	300 GPa
Flexural Strength	800 MPa
Compressive Strength	3000 MPa
Poisson's Ratio	0.28
Fracture Toughness	7 MPa m½
Electrical
Dielectric Strength	13 ac V/mm
Dielectric Constant	9.6 (@ 1 MHz)
Volume Resistivity	10^14 ohm-cm
Thermal
Coefficient of Thermal Expansion	3.1 x 10^-6/°C
Thermal Conductivity	17 W/(m*K)
Specific Heat	0.65 x10^3 J/(Kg*K)
Shock Resistance	800 °C Diff.
Maximum Working Temperature	1300 °C