The process of hot forging with permanent moulds is a challenge in respect to the very high thermal, mechanical and tribological loads on tools. Ensuring sufficient lifetime application of protective films can be beneficial. Initial screening experiments using PVD coated compression plates show that one of the metastable phases of alumina, the g-phase, exhibits high strength and toughness and fulfils the requirements for a protective coating. The next important step in the development towards an industrial application is the implementation on complex tool shapes and verification in real forming experiments. After coating deposition using an industrial coating unit, coated dies were tested in forming experiments under industrial conditions. The forming experiments show an improvement of the wear resistance after 1000 forming cycles for the coated dies compared to the uncoated dies.
Es wurden Reduktionsversuche an Nickel‐ und Kupferoxyden mit festem Kohlenstoff durchgeführt. Die Reduktion der Kupferoxyde beginnt bereits bei etwa 550° praktisch merklich zu werden, während der Sauerstoffabbau der Nickeloxyde erst bei etwa 800° die Werte der Kupferoxydreduktion für 500° erreicht.
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