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Alternative To Kovar-Lightweight Controlled Expansion Si/Al Alloy
Nov 23, 2016

   With the lightening requirement of electronic components, controlled expansion Si/Al alloys have successfully replaced Kovar because of low CTE, lightweight and superior mechanical properties.

 

Alloy

CTE, ppm/ºC

Thermal 

    Conductivity,           W/mK

Density, g/cm3

Plateability

Machinability

Weldability

Formability

AlSi27

17

175

2.6

Good

Good

Good

Good

AlSi50

11.5

140

2.5

Good

Good

Good

Good

AlSi70

7.5

120

2.43

Good

Good

Good

Good

Kovar

6.0

15

8.4

Good

Good

Good

Good

   We can clearly see from the table, the weight of Si/Al alloys is only about 1/3 of Kovar, thermal conductivity of Si/Al alloys is much higher than that of Kovar.Besides, CTE of Si/Al can be toilored and similiar as Kovar.

   Therefore, Si/Al is the alternative to Kovar for electronic packaging and thermal management applications.