Abstract
The diffusion of zirconium and copper deposited on a flat graphite surface after annealing at 898 K for 1800 s and 1233 K for 300 s was studied by glow discharge optical emission spectrometry. At the temperature of 898 K no mutual diffusion of Zr and Cu appears. At the temperature of 1233 K Zr diffuses into Cu, and a zirconium containing phase at the contact with carbon may occur. The obtained results have a qualitative character and are discussed in connection with the influence of zirconium on the thermal conductivity of the Cu-Zr matrix.

Key words
zirconium, copper, carbon, optical emission spectrometry, heat treatment, mutual diffusion

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