Silicon Nitride Ceramic


Characteristics:
Silicon Nitride ceramic product has the advantages of excellent corrosion resistance, high coefficient of heat conductivity,self-lubricity, small expansion and so on.It can be widely used in the petroleum,chemical,machinery,metallurgical industry and motors industries.
Silicon Nitride ceramic sealing part:
Resistance to strong acid, strong alkali, salt and gas of deleterious, with high strength,excellent thermal shock resistance and electric insulation, resistance to wear, especially resistance to hydrofluoric acid.
Silicon Nitride ceramic bearing ball:
(1)low confficient of thermal expansion ,only 1/4" of steel ball.
(2)less friction generated in the bearing as heat increases.
(3)low thermal conductivity.
(4)Long life and no need for lubrication.
(5)Anti-magnetic and resistant to corrosion by most substances
(6)light weight ,good surface finish and high temperature hardness
Technical Specifications:

Item

SI3N4(RB)

SI3N4(G.P.S)

SI3N4(HP)

Density(g/cm3)

2.5-2.6

3.2-3.3

3.4-3.7

Hardess(HRA)

80-86

89-92

93-94

Bending strength(Mpa)

160-210

500-700

800-1100

Porosity(%)

<1

<0.05

<0.01

Linear expansion coefficient (10-6K-1)

2.55

3.4

3.7

Fracture toughness(/MPam1/2)

7

7.5

6.8

Thermal conductivity(W/m·K)

10~15

15~20

20~25

Specification Available:
Silicon Nitride ceramic sealing part:As cutomer request.
Silicon Nitride ceramic bearing ball: Dia1.0-120.0mm( G3-G100)

Application:
Sealing rings for vacuum pump, acid alkali, salt, measure pumps, flowmeter and deep well pump and various rotary sealing rings.
It is suitable for applications where high loads,high speeds and extreme temperatures.It is mainly used in bearing which may work in harsh entironment.

 

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