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Testing of the Impact Load of Thin Hard Nanocomposite, Multilayer and Monolayer Coatings

To evaluate the impact resistance of thin hard nanocomposite, multilayer and monolayer coatings in dynamic loading wear applications an impact test has been used. An impact testing of the coatings was proposed by Knotek et al in the 1990s. During testing the specimen is cyclically loaded by tungsten carbide ball that impacts of the coating/substrate surface. The test simulates a wide range of tribological systems.

Thin Layers

Thin layers are prepared by magnetron sputtering by using the commercially available LEYBOLD-HERAEUS Z 550 sputtering device. This device enables one to produce smaller batches or single pieces with maximum diameter of 100 mm and thickness less then 20 mm. It is equipped with three magnetrons with targets of 152 mm in diameter (the typical target thickness is 6 mm) which enables the deposition of three different materials without interrupting the vacuum. To meet special demands it is possible to apply some voltage to the substrate (bias sputtering, plasma etching) or to heat the substrate by using an infra-red radiator. Any materials which can be shaped as a disc of 152 mm in diameter and 1 – 6 mm thick can be deposited. The thickness of the deposited layers ranges from the unit of nanometers to the unit of micrometers, only for materials having a very low speed of sputtering, e.g. oxides, the upper limit lies in the region of hundreds of nanometers.

Vacuum soldering

Provádíme klasické vakuové pájení např. mědí nebo niklovou pájkou. Pro spojování kovů s křehkými nekovovými materiály bylo zavedeno pájení tvárnými aktivními pájkami.

Production and developement of the vacuum feedthroughs

In our department we develop and produce vacuum feedthroughs based on glass-to-metal seal (matched kovar-glass or compression seal). The feedthroughs can be welded to custom flanges.

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