Thermal Conductivity and Thermal Expansion of Copper Matrix Composites Reinforced with High Modulus C Fibres

Abstract

Copper matrix composite with pure copper matrix reinforced with high modulus carbon fibres Thornel K 1100 was prepared by gas pressure infiltration technique. As-received composite was subjected to thermal expansion and thermal conductivity measurements in longitudinal and transversal directions. Large anisotropy of properties as well as surprisingly good structural stability has been observed. The mean coefficients of thermal expansion as low as 0.8 x 10-6 K-1 in longitudinal and as high as 23.5 x 10-6 K-1 in transversal directions were determined, the thermal conductivities as high as 650 Wm-1K-1 in longitudinal direction and as low as 60.7 Wm-1K-1in transversal directions were measured.

Structure and thermal expansion behaviour of Al/C composites reinforced with unidirectionally aligned continuous high modulus C fibres

“…The particular distribution of reinforcing fibres is decisive not only for mechanical properties but also for the thermal conductivity of the composite. Large differences in TC for the current Al-3Mg/K1100 composite were confirmed already in [24]. The TC in L direction was 540.8 W m −1 K −1 whereas in T direction only 25.4 W m −1 K −1 .…”

Review of Recent Development in Copper/Carbon Composites Prepared by Infiltration Technique

“…Nad'a Beronská and her colleagues used HM carbon fibres with 900-1000 Wm −1 K −1 thermal conductivity and-1.5 × 10 −6 CTE in the longitudinal direction. The thermal conductivity improved more than 60% in the longitudinal direction, since copper has conductivity of 400 Wm −1 K −1 [50]. Addition of Cu caused a major impact on the thermal conductivity by reaching a value almost double in comparison to C/C-SiC, which was 45.9 Wm −1 K −1 in the horizontal direction [41].…”

“…A study held in 2010 [50] focused on C f /Cu composite's thermal conductivity and thermal expansion measurements in both the longitudinal and transversal directions. Preforms (Figure 2) had been placed in a high-pressure autoclave and preheated in a vacuum of 100 Pa before being used in the process.…”

“…The carbon preform is an important factor in determining the mechanical and physical properties of composites. The carbon preforms used in reviewed studies can be broadly divided into two categories, carbon/carbon preforms [37,38,51] and carbon preforms [48][49][50]53]. Although most of them are produced from carbon fibers [34,35,37,44,50,51], it has been observed in some cases that the starting material was carbon powder [47,52,53].…”

“…The carbon preforms used in reviewed studies can be broadly divided into two categories, carbon/carbon preforms [37,38,51] and carbon preforms [48][49][50]53]. Although most of them are produced from carbon fibers [34,35,37,44,50,51], it has been observed in some cases that the starting material was carbon powder [47,52,53]. Apart from this, preforms produced with 3D printing [36] are slowly starting to be used by researchers also.…”