CORRELATION BETWEEN CTE AND POWDER METALLURGY PART DENSITY.

The Coefficient of Thermal Expansion (CTE) is defined as the increment of length in a unit of length for a rise in temperature of 1 degree.

The CTE of the sintered metal powder materials is different from the wrought materials due to residual porosity. As a rule, the higher the density, the lower the porosity and higher the CTE.

For wrought copper CTE is in the range of 16.5-18 µ·in /in·°C. For wrought iron based materials, CTE = 9.8-12 µ·in /in·°C.

CTE of the sintered metal powder material can be calculated by formula:

CTEpm = CTEwr ( Dpm/Dwr)1/s,

where:
CTEpm= CTE for a powdered metal part.
CTEwr = CTE for wrought material.
Dpm = density of the powdered material
Dwr = density of the wrought material.
CTEwr = 11.7 µ·in /in·°C for the wrought pure iron and iron-carbon alloys with 0.6-0.22% carbon .


Diagram 1 shows the CTEpm for powdered metal part with density
Dpm = 6.0-7.3 g/cc.

 
 
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