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Changes
→5.1.6.2.2 Copper-Zirconium Alloys
The solubility of Zirconium in copper is 0.15 wt% Zr at the eutectic temperature of 980°C ''(Fig. 5.36)''. Copper-zirconium materials have a similar properties spectrum compared to the one for copper-chromium materials. At room temperature the mechanical properties of copper-zirconium are less suitable than those of copper chromium, its temperature stability is however at least the same.
======5.1.6.2.3 Copper-Chromium-Zirconium Alloys======
The earlier used CuCr and CuZr materials have been partially replaced over the years by the capitation hardening three materials alloy CuCr1Zr. This material exhibits high mechanical strength at elevated temperatures and good oxidation resistance as well as high softening temperatures. In its hardened condition CuCr1Zr has also a high electrical conductivity (Bild 5.37). Their usage extends from mechanically and thermally highly stressed parts such as contact tulips in high voltage switchgear to electrodes for resistance welding.
Fig. 5.36:
Copper corner of the copperzirconium
for up to 0.5 wt%
zirconium
Fig. 5.37:
Softening of CuCr1Zr after
1 hr annealing and after 90%
cold working
