Details
| Original language | English |
|---|---|
| Pages (from-to) | 2171-2183 |
| Number of pages | 13 |
| Journal | International Journal of Metalcasting |
| Volume | 17 |
| Issue number | 3 |
| Early online date | 15 Dec 2022 |
| Publication status | Published - Jul 2023 |
Abstract
Novel aluminum-copper compound castings devoid of oxide layers at the interface between the joining partners were developed in order to increase the thermal conductivity of the hybrid component. Due to the natural oxide layers of both aluminum and copper, metallurgical bonds between such bi-metal castings cannot be easily achieved in conventional processes. However, in an atmosphere comparable to extreme high vacuum created by using silane-doped inert gas, metallurgical bonds between the active surfaces of both aluminum and copper can be realized without additional coatings or fluxes. An intermetallic was created between aluminum and copper. Thus, very high thermal conductivities could be obtained for these hybrid castings, exceeding those of conventionally joined samples considerably. The intermetallic phase seams emerging between the joining partners were investigated using scanning electron microscopy and X-ray diffraction. The reduction of casting temperatures resulted in narrower intermetallic phase seams and these in turn in a much lower contact resistance between the two joining partners. This effect can be utilized for increasing the heat transfer capabilities of compound casting components employed for cooling heat sources such as high-power light-emitting diodes.
Keywords
- bi-metal compounds, cooling components, extreme high vacuum, intermetallic phases, microstructure
ASJC Scopus subject areas
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Industrial and Manufacturing Engineering
- Materials Science(all)
- Metals and Alloys
- Materials Science(all)
- Materials Chemistry
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In: International Journal of Metalcasting, Vol. 17, No. 3, 07.2023, p. 2171-2183.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Oxygen-Free Compound Casting of Aluminum and Copper in a Silane-Doped Inert Gas Atmosphere
T2 - A New Approach to Increase Thermal Conductivity
AU - Fromm, Andreas C.
AU - Barienti, Khemais
AU - Selmanovic, Armin
AU - Thürer, Susanne E.
AU - Nürnberger, Florian
AU - Maier, Hans Jürgen
AU - Klose, Christian
N1 - Funding Information: Open Access funding enabled and organized by Projekt DEAL. This research was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - Project-ID 394563137 - SFB 1368.
PY - 2023/7
Y1 - 2023/7
N2 - Novel aluminum-copper compound castings devoid of oxide layers at the interface between the joining partners were developed in order to increase the thermal conductivity of the hybrid component. Due to the natural oxide layers of both aluminum and copper, metallurgical bonds between such bi-metal castings cannot be easily achieved in conventional processes. However, in an atmosphere comparable to extreme high vacuum created by using silane-doped inert gas, metallurgical bonds between the active surfaces of both aluminum and copper can be realized without additional coatings or fluxes. An intermetallic was created between aluminum and copper. Thus, very high thermal conductivities could be obtained for these hybrid castings, exceeding those of conventionally joined samples considerably. The intermetallic phase seams emerging between the joining partners were investigated using scanning electron microscopy and X-ray diffraction. The reduction of casting temperatures resulted in narrower intermetallic phase seams and these in turn in a much lower contact resistance between the two joining partners. This effect can be utilized for increasing the heat transfer capabilities of compound casting components employed for cooling heat sources such as high-power light-emitting diodes.
AB - Novel aluminum-copper compound castings devoid of oxide layers at the interface between the joining partners were developed in order to increase the thermal conductivity of the hybrid component. Due to the natural oxide layers of both aluminum and copper, metallurgical bonds between such bi-metal castings cannot be easily achieved in conventional processes. However, in an atmosphere comparable to extreme high vacuum created by using silane-doped inert gas, metallurgical bonds between the active surfaces of both aluminum and copper can be realized without additional coatings or fluxes. An intermetallic was created between aluminum and copper. Thus, very high thermal conductivities could be obtained for these hybrid castings, exceeding those of conventionally joined samples considerably. The intermetallic phase seams emerging between the joining partners were investigated using scanning electron microscopy and X-ray diffraction. The reduction of casting temperatures resulted in narrower intermetallic phase seams and these in turn in a much lower contact resistance between the two joining partners. This effect can be utilized for increasing the heat transfer capabilities of compound casting components employed for cooling heat sources such as high-power light-emitting diodes.
KW - bi-metal compounds
KW - cooling components
KW - extreme high vacuum
KW - intermetallic phases
KW - microstructure
UR - http://www.scopus.com/inward/record.url?scp=85144090328&partnerID=8YFLogxK
U2 - 10.1007/s40962-022-00910-w
DO - 10.1007/s40962-022-00910-w
M3 - Article
AN - SCOPUS:85144090328
VL - 17
SP - 2171
EP - 2183
JO - International Journal of Metalcasting
JF - International Journal of Metalcasting
SN - 1939-5981
IS - 3
ER -