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Thermic Edge LTD.
30 Brunel Road,
St. Leonards on Sea,
East Sussex
TN38 9RT
England
 
Telephone:
+44(0)1424 850811
 
E-mail:
sales@thermic-edge.com
 
 
 

MacorShapalBoron NitridePyrolytic BNOxidesNitrides/CarbidesCarbides

Aluminium Nitride (AlN), Silicon Nitride - (Si3N4) and Silicon Carbide (SiC)

Aluminium Nitride and Silicon Nitride

Aluminium nitride is an interesting material and is one of the best materials to use if high thermal conductivity is required. When combined with its excellent electrical insulation properties, aluminium nitride is an ideal heat sink material for many electrical and electronic applications.

Silicon nitride is an extremely hard material and is very useful for applications in which physical wear is of great importance. Silicon nitride also has very good thermal shock characteristics.

Typical applications: electronic components; heat sinks; turbine blades

 

Silicon Carbide


Like oxides and nitrides, silicon carbide is a very hard wearing material, again requiring diamond-grinding methods to process once fired. Although not exclusively, carbides are used mainly for applications in which physical wear is a major consideration. They are amongst the hardest materials available.
 

Typical applications: valve seats; bearings.

 

Nitrides and Carbides Physical Properties

 

name ALN Silicon
Nitride
Porcelain Silicon
Nitride
hot pressed
Silicon
Carbide
Steel(mild)
colour fawn/grey grey white grey black grey
density 3.3g/cm 2.5g/cm 2.4g/cm3 3.3g/cm 3.1g/cm 7.85kg dm
porosity 0%    0% 0% 0% 0%
poissons
ratio

 

   0.2    0.28 0.24 0.27-0.30
thermal
conductivity

 

180
Wm/C
10-15
Wm/C
2.06Wm/C 15-20
Wm/K
150
Wm/K
50 Wm/C
coeffcient
of expansion

 

3.8 x
10-6/deg;C
   6.5x10-6
20-800C
      11x10/C
dielectric
strength

 

20
KV/mm
   25 KV/mm         
dielectric
constant

 

9
1MHZ
10            
dielectric
loss tangent

 

0.001
1MHZ
              
flexual strength

 

360
MPa
200
MPa
   800
MPa
400
MPa
  
hardness 1100
Vickers
1100
Vickers
7-8 Mohs 1500
Vickers
3000
Vickers
  
volume
resistancy

 

>1014
ohm/cm
>1010
ohm/cm
   >1010
ohm/cm
>1010
ohm/cm
  
max. use temp

 

1800C 1150C    1150C 1300C   
thermal
expansivity

 

   3.1
500-
1300
   3.3
500-
1300K
3x
10sup-6C
11x10/C
specific heat

 

800
J/KgK
1100
J/KgK
   800
J/KgK
1100
J/KgK
450J/kgK
compressive
strength

 

   550
MPa
480 MPa 2000
MPa
2000
MPa
  

 

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