INFLUENCE OF THERMAL CYCLING ON MICROSTRUCTURE AND THERMAL EXPANSION OF CARBON FIBRES/COPPER COMPOSITES
The preparation of copper matrix reinforced by high modulus carbon fibres (Thornel K1100) as well as the microstructure and dilatation changes during thermocycling is presented.Unidirectional composites with two types of matrix - pure copper and/or copper alloy with 0.2 wt. % of chromium - were ther...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Univerzity of Zilina. Faculty of Mechanical Engineering
2009-06-01
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| Series: | Materiálové Inžinierstvo |
| Subjects: | |
| Online Access: | http://fstroj.uniza.sk/journal-mi/PDF/2009/01-03.pdf |
| Summary: | The preparation of copper matrix reinforced by high modulus carbon fibres (Thornel K1100) as well as the microstructure and dilatation changes during thermocycling is presented.Unidirectional composites with two types of matrix - pure copper and/or copper alloy with 0.2 wt. % of chromium - were thermally cycled between 30-600 °C three times.The composite with pure Cu exhibited larger voids and weak interfacial bonding. Due to the chemical reaction with K1100 fibres a reactive interfacial bonding has been formed. During thermocycling the hysteresis, but no large disintegration was observed. The coefficients of thermal expansion (CTEs) strongly depend on fibre orientation. In direction parallel to the fibre orientation in the temperature range of 220-500°C CTEs were very low (0.7-1.0x10-6/K), but in perpendicular direction the CTEs were higher than that of pure copper. |
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| ISSN: | 1335-0803 1338-6174 |