Silicon nitride porous locating rings are hard and self-lubricating, making them wear-resistant. In addition, silicon nitride ceramics do not react with inorganic acids other than hydrofluoric acid and have high corrosion resistance. In addition, silicon nitride ceramics have excellent thermal shock resistance and will not crack when heated to 1000°C in air and then quickly cooled.

Silicon nitride is a man-made compound synthesized through several different chemical reaction methods. Pressing and sintering parts through proven methods produces ceramics with a unique range of excellent properties. The material is dark gray or black and can be polished to a very smooth reflective surface, giving the part an eye-catching appearance.

Silicon nitride’s thermal shock resistance exceeds that of other ceramic materials. It also has an excellent combination of low density, high strength, low thermal expansion, good corrosion resistance, and fracture toughness.

Silicon nitride has been used in many industrial applications such as engine components, bearings, and cutting tools.

Silicon nitride Performance

Item

Unit

Si3N4

Type

Gas pressure sintered

Density

g/cm3

3.2-3.3

Color

Black, Grey

Young Modulus

GPa

300~320

Vickers Hardness

GPa

15 – 17

Compressive Strength

MPa

2200

Bending Strength

MPa

600-1000

Thermal Conductivity

W/m.K

20-30

Thermal Expansion

10-6/°C

3.2

Max. Working Temp.

°C

1200

Volume Resistivity

Ω ·cm

> 1014

Dielectric Constant

6

Dielectric Strength

kV/mm

12

Fracture toughness

MPa·m1/2

5.0-7.0

Advantages of Silicon nitride porous locating rings

– Has the advantages of a high melting point and low thermal expansion coefficient and can withstand the high-temperature environment generated when the equipment is working

-Has good corrosion resistance to chemical media such as acids, alkalis, and salts, and can resist corrosive gases and liquids that the equipment may encounter during operation.

-Has the characteristics of high strength and high hardness and can withstand the mechanical stress and impact that the equipment receives during operation.

-Has a porous structure, which can provide good air permeability and water absorption, which is beneficial to the flow of gas and the penetration of liquid

-Due to the high hardness and good wear resistance of silicon nitride, it can effectively resist the friction and wear of the equipment during operation.

-The surface of the silicon nitride porous positioning ring is very smooth and does not easily adhere to impurities and dirt, making it easy to clean and maintain

Application of Silicon nitride porous locating ring

Silicon nitride porous locating ring is a porous positioning ring made of silicon nitride ceramic material, which has excellent high-temperature resistance, corrosion resistance, high strength, high hardness, and other properties. This kind of porous positioning ring is suitable for positioning and fixing in various harsh environments such as high temperature, high pressure, and high corrosion, such as reactors, pipelines, valves, and other equipment in chemical, petroleum, pharmaceutical, and other fields.

Packing

Silicon nitride porous locating rings use appropriate outer boxes and internal buffer materials, and some components are also vacuum-packed.