Wyniki wyszukiwania - Biblioteka Nauki

1

Adhesion measurement of coating made of mononitrides and composite materials by the scratch method.

100%

Kupczyk M. , Wieczorowski K.

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tom vol. 22, nr 3

115-122

EN

Theoretical assumption and experimental results concerning the technological and functional quality of thin, hard coatings produced on cutting edges are described. Mononitrides and composite material coatings were produced on SW7M (S4) high-speed steel by the arc-plasma method. The adhesion force of the CrN, TiN, ZrN, (TiCr)N, (TiZr)N, (TiNbCr)N, (Ti0,85Cr0,15)N, (TiCr0,15Zr)N and (TiCr0,25Zr)N coatings to the substrate was estimated using the scratch test. The usefulness of this non-destructive method, both in a laboratory and industry practice, is stressed. On the base of investigation results it can be stated that hardness of coatings have influence on a critical load.

PL

Teoretyczne założenia i wyniki badań eksperymentalnych dotyczące jakości technologicznej i użytkowej cienkich, twardych powłok wytwarzanych na ostrzach skrawających. Powłoki z monoazotków i materiałów złożonych były wytwarzane na stali szybkotnącej SW7M (S4) metodą łukowo-plazmową. Pomiary siły adhezji powłok CrN, TiN, ZrN, (TiCr)N, (TiZr)N, (TiNbCr)N, (Ti0,85Cr0,15)N, (TiCr0,15Zr)N i (TiCr0,25Zr)N do podłoża oceniano za pomocą testu na zarysowanie. Podkreślono przydatność tej nieniszczącej metody zarówno w warunkach laboratoryjnych, jak i w praktyce przemysłowej. Na podstawie wyników badań stwierdzono istotny wpływ twardości powłok na wartość obciążenia krytycznego.

2

Tribological properties of CrNx coatings

80%

Warcholinski B. , Gilewicz A.

Journal of Achievements in Materials and Manufacturing Engineering

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2009

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tom Vol. 37, nr 2

498-504

EN

Purpose: The purpose of this work is the characterization of the tribological properties thin Cr-N coatings, both monolayer Cr2N, CrN coatings and multilayer Cr/CrN, Cr2N/CrN coatings, deposited by cathodic arc physical vapour deposition (CAPVD). Design/methodology/approach: The deposition parameters of Cr2N and CrN were determined. Structure of the coatings were investigated using the scanning electron microscopy (SEM). The XRD examination was carried out to specify the phase structure, EDS to define the chemical composition of the coatings. The investigation includes also microhardness, roughness tests, adhesion, friction coefficient and wear rate. Findings: Basing on the scratch test it was shown that the influence of the architecture on the coating’ adhesion is dominant. It was found that the all tested coatings show high critical load Lc2 >70 N. The multilayer coatings show higher critical load when compared to monolayer coatings. Research limitations/implications: The main limitation of this work is linked to the deposition technique itself.It is difficult to avoid surface defects and pinholes that strongly influence the tribological results. Practical implications: Chromium based coatings present good mechanical properties which allow them to be used in several applications; from decorative to protective coatings. Originality/value: The comparison of adhesion and wear resistance of mono- and multilayer coatings based on chromium. The deposition technology enable to obtain the coatings with high adhesion to the substrate. This may be important to advanced coatings industry.

3

Influence of the PVD and CVD technologies on the residual macrostresses and functional properties of the coated tool ceramics

80%

Dobrzański L. A. , Skrzypek S. , Pakuła D. , Mikuła J. , Křiž A.

Journal of Achievements in Materials and Manufacturing Engineering

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2009

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tom Vol. 35, nr 2

162-168

EN

Purpose: The goal of this work is to compare the macro-stresses as well as mechanical and functional properties of the PVD and CVD coatings deposited on oxide and nitride ceramics tool. Design/methodology/approach: In the paper the residual macro-stresses of PVD and CVD coatings deposited on tool ceramics substrates, measured with the application of the grazing angle X-ray diffraction geometry are compared in relation to the fundamental mechanical properties like hardness and adhesion. Findings: Basing on the tribological test made by the use of the „pin-on-disk” method, the influence of the residual macro-stresses to wear resistance is being investigated. Practical implications: The process of covering tools with the thin wear resistant PVD and CVD coatings is currently the most commonly method used to extend their life. Investigations of those coatings determining their mechanical properties, chemical composition, and structure, enable to pick out the optimum coatings for given industrial applications. Originality/value: New X-ray diffraction g-sin2ř method based on glancing angle X-ray beam geometry (GID), macro-stresses of the examined CVD and PVD coatings have been measured.

4

Investigation of the life-time of drills covered with the anti-wear Cr(C,N) complex coatings, deposited by means of Arc-PVD technique

80%

Kusiński J. , Rozmus M. , Bujak J.

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tom Vol. 33, nr 1

86-93

EN

Purpose: This research was done to study the tribological behavior of twist HS6-5-2 drills covered with Cr/CrN/CrN+Cr2N/Cr(C, N) and Cr/CrN/ Cr(C, N) coatings as well as to obtain detailed information about microstructure and properties of investigated coatings. Design/methodology/approach: The coatings were deposited by the ARC-PVD process and examined revealing their microstructure: with the use of SEM and TEM microscopy and composition: chemical (EDS microanalysis) and phase (XRD). Also microhardness, Young’s modulus and adhesion were measured using NHT CSEM hardness tester and scratch tester. Findings: The electron energy disspersive (EDS) analysis of coatings showed higher concentration of nitrogen (in the internal coating-zone) and carbon (in the external coating-zone). The X-ray diffractometry showed that coatings are mainly composed of CrN and Cr2N nitrides. The TEM analysis revealed that coating crystallization starts with nanometric Cr2N nitrides coherent with the ferrite matrix grains. The coatings turned out to improve the lifetime of the drills (much better than that of un-coated ones). Practical implications: The main aim of this work is to determine properties of multilayer and multi-component coatings on basis of Cr, C and N, which are potential candidates for replacing TiN coatings in certain applications. Originality/value: The paper contributes to better understanding of microstructure and properties of the coatings (chemical and phase composition, microhardness, Young’s modulus, adhesion), as well as lifetime of the coated drills.