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Wear of hard coatings
Černý, Libor ; Křupka, Ivan (referee) ; Omasta, Milan (advisor)
This bachelor's thesis was made as a description of the main technological methods, which are used in order to manufacture hard coatings. Applications of hard coatings are realized to improve tribological properties of components in various industries. The aim is to minimize the amount of wear and friction losses. Thesis also discusses methods of measuring the hard coatings wear. These methods are important to determine the properties of coating layers and their subsequent use. A lot of testing methods offer sufficient possibilities to test various mechanisms of wear in variety of laboratory conditions. Additionally in the end of the thesis there is an experimental wear measurement of specimen on tribometer using the "Pin on disc" method. Both size and type of the wear are evaluated by profilometer.
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Wear of hard coatings
Černý, Libor ; Křupka, Ivan (referee) ; Omasta, Milan (advisor)
This bachelor's thesis was made as a description of the main technological methods, which are used in order to manufacture hard coatings. Applications of hard coatings are realized to improve tribological properties of components in various industries. The aim is to minimize the amount of wear and friction losses. Thesis also discusses methods of measuring the hard coatings wear. These methods are important to determine the properties of coating layers and their subsequent use. A lot of testing methods offer sufficient possibilities to test various mechanisms of wear in variety of laboratory conditions. Additionally in the end of the thesis there is an experimental wear measurement of specimen on tribometer using the "Pin on disc" method. Both size and type of the wear are evaluated by profilometer.
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Dynamic impact tester of hard thin coatings
Grossman, Jan ; Dupák, Libor ; Fořt, Tomáš ; Sobota, Jaroslav
An impact test has been used to evaluate the impact wear resistance of nanostructured hard coatings using a system developed at the Institute of Scientific Instruments in collaboration with the Brno University of Technology. 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 the determination of both the fracture toughness and wear behaviour of hard thin coatings.
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Institute of Scientific Instruments: An Overview Presenatation
Kolařík, Vladimír ; Zobač, Martin ; Fořt, Tomáš ; Vlček, Ivan ; Dupák, Libor ; Mikmeková, Šárka ; Mikmeková, Eliška ; Mrňa, Libor ; Horáček, Miroslav ; Sobota, Jaroslav
The aim of this contribution is to present the Institute of Scientific Instrument of the Academy of Sciences of the Czech Republic, mainly from the potential of applied research viewpoint. It covers mainly the six application fields including material study of metals and alloys, nano layer residual stress observation methods, 2 kW fibre laser, impact testing of hard coatings, e-beam welding, machining and engraving, and finally e-beam lithography. Recently achieved results as well as the new application potential are presented. Furthermore, each topic is assumed to have a separate presentation prepared in more details within this event. A brief overview follows. Scanning low energy electron microscopy (SLEEM) is increasingly becoming recognized as a valuable analytical tool in the field of materials science. The SLEEM is also used for observation of compressive stress in nano layers that leads to wrinkling and film delamination. Using the fibre laser, we can offer 3D laser welding and cutting of various type of materials and laser surface hardening too. For the hard coatings testing and evaluation of their impact resistance a new method was suggested (Dynamic Impact Wear Test). During testing the specimen is cyclically loaded by tungsten carbide ball that impacts of the coating/substrate surface. In house e-beam welding machine allows for welding, machining, engraving and other utilizations of intense electron beam. The group of micro lithography is able to prepare micro and nano structures in thin layers of metals and other materials; including the characterization of the realized structures
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