Portal de Periódicos da CAPES

Thermal expansion of copper-carbon fiber composites

1994; Elsevier BV; Volume: 20; Issue: 1 Linguagem: Inglês

10.1016/0167-8442(94)90026-4

1872-7638

Pavol Štefánik, P. Šebo,

Material Properties and Applications

Abstract The thermal expansion data are obtained for carbon fiber copper matrix composites prepared from variously arranged crossed ply unidirectional monolayers and copper foils. Four types of specimens are made with different thickness of monolayers and copper foils and constant carbon fiber content. The initial thermal treatment of all specimens was the same. After being cooled from the bonding temperature, they were cycled up to 673 K three times. Due to this treatment the cracks were created in the monolayers. The specimens were additionally cycled between the temperature of 293 K to 623 K and coefficient of thermal expansion calculated from the linear slope for lower temperatures was about 10−5 m/m/K and decreased to zero at 600 K due to the very low coefficient of thermal expansion of the carbon fibers. Thermal expansion led to large hysteresis by plastic flow of the copper matrix. The hysteresis loops after additional cycling did not change. No other cracks were observed by optical microscopy.