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ADVANCED CERAMICS sintered Silicon Nitride (Si3N4) is produced to be an isotropic near full density material offering excellent wear resistance. Pressureless sintering allows for near net shape forming of complex components for a wide variety of structural applications. Through control of processing and chemistry, the grain boundary or intergranular phase is engineered to be crystalline in ADVANCED CERAMICS PSX Si3N4 and amorphous in ADVANCED CERAMICS PSG Si3N4.

 

ADVANCED CERAMICS PSX Si3N4 has improved elevated temperature properties while ADVANCED CERAMICS PSG has excellent room temperature properties. ADVANCED CERAMICS RBSN (Reaction Bonded Silicon Nitride) is an excellent engineering material containing no glassy second phase for wear and high temperature applications in which 20-25% fine porosity is desired or permissible. The following chart lists typical properties:

 

 

 

 

 

 

 

 

 

Grade of Sintered Si3N4

PSG

PSX

RBSN

 

Bulk Density

g/cmˆ3

3.24

3.24

2.2-2.5

 

Average Grain Size

µm

1.2

1.0

1.0

 

Flexural Strength, (4-Pt MOR) @RT

Ksi
MPa

100
690

102
700

35-42
240-290

 

Characteristic Strength

MPa

720

740

250-310

 

Weibull Modulus (m)

 

15

14

-

 

Elastic Modulus (E)

GPa

320

310

75

 

Poisson's Ratio (n)

 

0.27

0.24

0.24

 

Hardness (Vickers 5.0 kg)

kg/mmˆ2

1450

1450

-

 

Fracture Toughness (Chevron Notch)

MPa-mˆ1/2

5.7

6.0

-

 

Thermal Expansion (RT-1000° C)

10-6/°C

3.3

3.4

3.3

 

Thermal Conductivity @RT

(W/m-K)

30

30

12

 

Electrical Resistivity

>10ˆ14

>10ˆ14

>10ˆ14

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Continued