Metal-Diamond Composites
description
Transcript of Metal-Diamond Composites
Metal-Diamond Composites
E. Neubauer
CompositionThermal Conductivity
[W/mK]CTE
[ppm/K]
Al-Dia 400 – 620 8 – 12
Cu-Dia 300 – 680 6 – 12
Ag-Dia 300 – 650 8 – 10
Task I: Optimisation of Material Composition/Processing
Table 1: Material properties realized in „lab-size“ by PM process
Task II: Optimisation of Thermal Stability of Metal-Diamond
3
0
20
40
60
80
100
120
140
160
180
200
220
240
950°C
71,1 %80,5 %
82,5 %
Cu+B+50vol.%Dia (120/140)
The
rmal
Diff
usiv
ity [m
2 /s*1
0-6]
Boron Content
heating up cooling down
0 200 400 600 800 100040
60
80
100
120
140
160
180
Cu+B+50vol.%Dia (120/140)
Th
erm
al D
iffu
sivi
ty [m
2 /s*1
0-6]
Temperature [°C]
Heating up Cooling down
4
Task III: Processing of large platesDirect heated hot pressing Expected installation of Dr. Fritsch hot press in
August/2009 Heating rate: up to 400 K/min Max. temperature: 2.400°C Size: 200mmx200mm (250mmx250mm)
Task IV: Uniformity of Material Properties on large plates
Local Thermal Analyses of Al-diamond composites
Al-Diamond system is very sensitive to T-t in processing
Al-Diamond composite 270 +/- 20 mm²/s 500 – 600 W/mK
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Task V: Shaping/Surface Finishing
Good surface quality can be realised by: preparation of sandwich structures or bi-layer structures
“Machining/Cutting” of composites is possible by:
Water Jet Cutting Laser Cutting Electro Discharge Machining