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This paper presents thermal expansion data for cross-ply and woven copper matrix-carbon fibre composites (Cu-C f MMCs) that were prepared by diffusion bonding. Thermal expansion was measured in two perpendicular in-plane directions of plate samples. For cross-ply samples (57 vol.%fibres) the mean coefficient of thermal expansion (CTE) between -20 and 300 o C changed from approximately 6.5x10 -6 / o C to 3.5x10 -6 / o C during heating/cooling. The in-plane CTE increases with decreasing fibre content. Composites with woven arrangement of carbon fibres show a slightly higher CTE at elevated temperature.