Changes

Under the aspect of reducing the gold content ternary alloys with a gold content of approximately 70 wt% and additions of Ag and Cu or Ag and Ni resp., for example AuAg25Cu5 or AuAg20Cu10 are used which exhibit for many applications good mechanical stability while at the same time have sufficient

resistance against the formation of corrosion layers ''(Table 2.3)''. Other ternary alloys based on the AuAg system are AuAg26Ni3 and AuAg25Pt6. These alloys are mechanically similar to the AuAgCu alloys but have significantly higher oxidation resistance at elevated temperatures ''(Table 2.4)''.

Caused by higher gold prices over the past years the development of alloys with

''(Table 2.5)''.

Table 2.3: Mechanical Properties of Gold and Gold-Alloys