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Tribologické chovaní tvrdých uhlíkových kompozitních vrstev
Fořt, Tomáš ; Grossman, Jan ; Sobota, Jaroslav ; Vítů, T. ; Novák, R.
Carbon hard composite coatings were exposed to dynamical load and high temperature pin-on-disc CSM Tribometer. To evaluate the impact resistance of thin hard composite coating in dynamic loading wear applications an impact test was used. The sliding tests in air were carried out in the range from room temperature to 500 °C with controlled relative humidity. Hardness, elastic modulus and fracture toughness of deposited coatings were studied by indentation technique using Fisherscope H100 tester.
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Testování odolnosti vůči nárazu tvrdých nanokompozitních povlaků
Fořt, Tomáš ; Sobota, Jaroslav ; Grossman, Jan
To evaluate the impact resistance of hard nanocomposite coatings in dynamic loading wear applications an impact test using system developed at the Institute of Scientific Instruments in collaboration with Brno University of Technology has been used. During testing the specimen is cyclically loaded by a ball that impacts of the coating surface. After the test, wear scars were evaluated by means of scanning electron microscope, spectral analyses and profilometer. The impact test offers an important new method for determination of the fracture toughness of hard thin coatings and simulates a wide range of tribological systems.
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Dynamic impact wear testing of nanostructured coatings
Boušek, Jaroslav ; Sobota, Jaroslav
Successive impacts of the cemented carbide ball onto a film coated sample induce high contact loads, which can vary in amplitude depending on the probe mass and the velocity of the probe immedialtely before the stroke. The method permits the variation of the impact force, the impact frequency and the number of impacts. Thus it is possible to quantify the number of the load cycles which a coated component can withstand and define a critical fatigue force. A simple probe including electronic circuity for this method use was designed. The basic equipment scheme and example of measurement are given.
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