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Statements

Subject Item
n2:RIV%2F68407700%3A21220%2F14%3A00227853%21RIV15-GA0-21220___
rdf:type
skos:Concept n15:Vysledek
dcterms:description
Processes when a large amount of hard particles such as alumina, zirconia and silica are pressed together represent a challenge not only for dies, where scratching took place, but also for punches with occurrence of multiple indentations. The damage of punches’ due to the indentations can even lead to substantial embedding of the hard particles into the surface and, ultimately, the surface obtains a character of stickiness and must be repeatedly mechanically cleaned by e.g. brushing. A multilayer consisting of three different layers, which limit the above described phenomena, was suggested and successfully tested during alumina-silica object pressing. The multilayer was created onto 56 HRC tempered hot work tool steel grade X40CrMoV5-1 that stands out by its high level toughness and dimensional stability. The novel multilayer consisted of nitrided layer, chromium nitride PVD coating and a morphous hydrogenated carbon diamond-like coating. Optimization of the multilayer structure and properties was ensured by (i) XRD analyses of phase composition and residual stresses and by (ii) observations of microstructure and chemical composition on SEM after each stage of multilayer bulit - up. Residual stresses in nitride layer were determined by conventional single hkl diffraction experiment, but residual stresses in C rN were obtained by measuring several hkl reflections and the resulting macroscopic stress tensor determined by method proposed by Winholtz and Cohen. The optimized multilayer movement in the die was much smoother and it exhibited superb resistance to particle deadlock in the surface. Moreover, the punches’ brushing could have been bypassed altogether and the quality of the alumina-silica surface after pressing was considerably improved Processes when a large amount of hard particles such as alumina, zirconia and silica are pressed together represent a challenge not only for dies, where scratching took place, but also for punches with occurrence of multiple indentations. The damage of punches’ due to the indentations can even lead to substantial embedding of the hard particles into the surface and, ultimately, the surface obtains a character of stickiness and must be repeatedly mechanically cleaned by e.g. brushing. A multilayer consisting of three different layers, which limit the above described phenomena, was suggested and successfully tested during alumina-silica object pressing. The multilayer was created onto 56 HRC tempered hot work tool steel grade X40CrMoV5-1 that stands out by its high level toughness and dimensional stability. The novel multilayer consisted of nitrided layer, chromium nitride PVD coating and a morphous hydrogenated carbon diamond-like coating. Optimization of the multilayer structure and properties was ensured by (i) XRD analyses of phase composition and residual stresses and by (ii) observations of microstructure and chemical composition on SEM after each stage of multilayer bulit - up. Residual stresses in nitride layer were determined by conventional single hkl diffraction experiment, but residual stresses in C rN were obtained by measuring several hkl reflections and the resulting macroscopic stress tensor determined by method proposed by Winholtz and Cohen. The optimized multilayer movement in the die was much smoother and it exhibited superb resistance to particle deadlock in the surface. Moreover, the punches’ brushing could have been bypassed altogether and the quality of the alumina-silica surface after pressing was considerably improved
dcterms:title
Functionally graded multilayer for withstanding indentations and inhibition of hard particle embedding into the surface Functionally graded multilayer for withstanding indentations and inhibition of hard particle embedding into the surface
skos:prefLabel
Functionally graded multilayer for withstanding indentations and inhibition of hard particle embedding into the surface Functionally graded multilayer for withstanding indentations and inhibition of hard particle embedding into the surface
skos:notation
RIV/68407700:21220/14:00227853!RIV15-GA0-21220___
n4:aktivita
n16:P
n4:aktivity
P(GA101/09/0702)
n4:dodaniDat
n11:2015
n4:domaciTvurceVysledku
n8:2687070 n8:8226660
n4:druhVysledku
n6:O
n4:duvernostUdaju
n14:S
n4:entitaPredkladatele
n13:predkladatel
n4:idSjednocenehoVysledku
17683
n4:idVysledku
RIV/68407700:21220/14:00227853
n4:jazykVysledku
n9:eng
n4:klicovaSlova
FGM; multilayer; punch surface; nitriding; CrN; DLC; residual stresses
n4:klicoveSlovo
n5:DLC n5:punch%20surface n5:CrN n5:FGM n5:nitriding n5:multilayer n5:residual%20stresses
n4:kontrolniKodProRIV
[1D1E9E9AB5BD]
n4:obor
n10:BM
n4:pocetDomacichTvurcuVysledku
2
n4:pocetTvurcuVysledku
5
n4:projekt
n12:GA101%2F09%2F0702
n4:rokUplatneniVysledku
n11:2014
n4:tvurceVysledku
Pala, Zdeněk Kolařík, Kamil Kyncl, Jiří Beránek, Libor Mušálek, R.
n17:organizacniJednotka
21220