Solid-liquid co-existent phase process: towards fully dense and thermally efficient Cu/C composite materials

Clio Azina (1, 2) , Jerome Roger (3) , Anne Joulain (4) , Vincent Mauchamp (5) , Bruno Mortaigne (6) , Yongfeng Lu (1) , Jean-François Silvain (2)

1 Department of Electrical Engineering
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
3 LCTS - Laboratoire des Composites Thermostructuraux
4 PDP - Physique des Défauts et de la Plasticité [Institut Pprime]
5 PPNa - Physique et Propriétés des Nanostructures [Institut Pprime]
6 DGA/MRIS - DGA/Mission pour la Recherche et l'Innovation Scientifique

Metal matrix composites are currently being investigated for thermal management applications. In the case of a copper/carbon (Cu/C) composite system, a particular issue is the lack of affinity between the Cu matrix and the C reinforcements. Titanium-alloyed Cu (Cu-Ti) powders were introduced in a Cu/C powder mixture and sintered under load at a temperature at which the Cu-Ti powders became liquid, while the rest of the Cu and C remained solid. Fully dense materials were obtained (porosity of less than 5%). The creation of regular and homogeneous interphases was confirmed. All Ti reacted with the carbon, hence purifying the Cu matrix. Thermal conductivities were enhanced as compared with the Cu/C composites without interphase. The chemical analyses are in agreement with thermodynamic simulations carried out to predict the phase transformation during the sintering process.

Mots clés: CALPHAD; conduction; metal matrix composites; heat; solid-liquid co-existent phase process

Domaines: Matériaux

Clio Azina, Jerome Roger, Anne Joulain, Vincent Mauchamp, Bruno Mortaigne, et al.. Solid-liquid co-existent phase process: towards fully dense and thermally efficient Cu/C composite materials. Journal of Alloys and Compounds, 2018, 738, pp.292-300. ⟨10.1016/j.jallcom.2017.12.196⟩. ⟨hal-01686477⟩