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PVD Coating (pvd + coating)

Distribution by Scientific Domains
Polymers and Materials Science100%

Selected Abstracts

Engineering and Design of Wear and Corrosion Resistant PVD Coatings Regarding the Exceptional Properties of Magnesium Substrates

PLASMA PROCESSES AND POLYMERS, Issue S1 2007
Holger Hoche
Abstract Although magnesium alloys were popular in the first half of the 20th century, the bad corrosion properties prevented their breakthrough in industrial mass production. Since the technology for the production of high purity alloys was introduced in the 1970s, magnesium alloys became more and more in the focus of industrial attention. Today magnesium alloys are state-of-the-art in construction parts in automotive industry. Despite its outstanding properties like good castability, low density and nearly unlimited availability the negative aspects like weak corrosion and wear behaviour still limit the application of magnesiums in industry, due to the need of sufficient surface protection (E. Aghion, B. Bronfin, Mater. Sci. Forum2000, 350,351, 19). Today, plasma electrolytic anodisations are state-of-the-art (H. Haferkamp, "Magnesiumkorrosion,Prozesse, Schutz von Anode und Kathode", in: Moderne Beschichtungsverfahren, F.-W. Bach, T. Duda, Eds., Wiley-VCH, Weinheim 2000, ISBN 3-527-30117-8, 242; M. Thoma, Metalloberfläche1984, 38, 393; T. W. Jelinek, Galvanotechnik2003, 94, 46; A. Kuhn, Galvanotechnik2003, 94, 1114). They provide acceptable corrosion resistance and protect the magnesium from mechanical damage due to their high hardness. On the other hand, their high porosity limits their use in combination with electrochemically noble materials, leading to galvanic corrosion (J. Senf, "Untersuchung und Beschreibung von Magnesiumdruckgusslegierungen unter tribologischer, korrosiver und mechanisch-korrosiver Beanspruchung, Berichte aus der Werkstofftechnik", Shaker Verlag, Germany 2001, ISBN 3-8265-8428-7). In addition, the high surface roughness of the plasma electrolytic anodisations restricts their use in tribological applications, particularly under sliding conditions (H. Hoche, "Grundlegende Untersuchungen zur Entwicklung von PVD-Beschichtungen auf Magnesiumlegierungen im Hinblick auf die Erhöhung der Verschleißbeständigkeit und unter Berücksichtigung des Korrosionsverhaltens", Dissertation, TU-Darmstadt D17, Shaker Verlag, Germany 2004). In order to achieve smooth surfaces with high quality, the PVD technology moves into the centre of interest. Since the 1980s PVD coatings are well established and widely used for different industrial applications, mainly for steel and tool coatings. The authors were the first who carried out serious studies on the development of PVD coatings for magnesium alloys in 1999 (J. Senf, "Untersuchung und Beschreibung von Magnesiumdruckgusslegierungen unter tribologischer, korrosiver und mechanisch-korrosiver Beanspruchung, Berichte aus der Werkstofftechnik", Shaker Verlag, Germany 2001, ISBN 3-8265-8428-7; H. Hoche, "Grundlegende Untersuchungen zur Entwicklung von PVD-Beschichtungen auf Magnesiumlegierungen im Hinblick auf die Erhöhung der Verschleißbeständigkeit und unter Berücksichtigung des Korrosionsverhaltens", Dissertation, TU-Darmstadt D17, Shaker Verlag, Germany 2004). The extensive research activities lead to the recent development of a coating system, which provides both, good wear properties as well as good corrosion behaviour. [source]

Damage Phenomena Observed on PVD Coatings Submitted to Repeated Impact Tests

PLASMA PROCESSES AND POLYMERS, Issue S1 2007
Florent Ledrappier
Abstract Thin hard coatings obtained by PVD process are widely used to improve the mechanical and friction behaviour of industrial parts. Depending on the friction conditions, the failure mechanisms and resulting selection criteria may be very different. This study aims to investigate the endurance life of some PVD coatings under repeated impact conditions. Impact tests at controlled impact energy have been performed using a hemispherical tip. Long-term tests have been done to determine the coating endurance life while short tests enable us to identify the damage phenomena. Depending on the nature of the PVD coating, cracks, blisters or spalling may be observed under impact. These phenomena may worsen until the complete film rupture occurs. [source]

VmeCN Based Nanoscale Multilayer PVD Coatings Deposited by the Combined High Power Impulse Magnetron Sputtering/Unbalanced Magnetron Sputtering Technology

PLASMA PROCESSES AND POLYMERS, Issue S1 2007
Papken Eh.
Abstract TiAlCN/VCN has been deposited by the combined high power impulse magnetron sputtering/unbalanced magnetron sputtering (HIPIMS/UBM) technology using a Hauzer HTC 1000-4 PVD system. V+ ion flux has been generated by HIPIMS discharge to sputter-clean the substrates prior to the coating deposition. The sputtering was carried out in a mixed CH4, N2 and Ar atmosphere. Coatings phase and nanoscale structure were characterised using a variety of surface analysis techniques. In dry milling of Al 7010-T 7651 alloy, a TiAlCN/VCN nanoscale multilayer PVD coating outperformed state-of-the-art diamond-like carbon (DLC, Cr/WC/a-CH) coating by a factor of four. In drilling Al-alloy enforced MMC materials, cemented carbide drills coated with TiAlCN/VCN produced 130 holes compared to one to two holes with uncoated drills. [source]

Werkzeugbeschichtungen für die Trockenbearbeitung,

MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK, Issue 10 2006
E. Abele
PVD coating; tribology; dry machining; tool wear Abstract Bei der Trockenbearbeitung wirkt an der Werkzeugschneide ein Belastungskollektiv aus mechanischen, thermischen und chemischen Einflussgrößen. Im Vergleich zur konventionellen Bearbeitung unter Verwendung von Vollstrahl-Emulsionskühlung erhöht die Trockenbearbeitung die auf den Schneidkeil wirkenden Belastungen. Eine sehr gute Möglichkeit die Schneide vor thermischen, abrasiven und tribo-oxidativem Verschleißangriff zu schützen stellt die Verwendung von PVD Beschichtungen dar. Neu entwickelte PVD Beschichtungen aus CrxAlyYzN, CrxAlyBzN und CrxAlySizN- wurden sowohl im tribologischen Modelltest als auch im realen Zerspanungstest auf ihre Eignung zur Trockenbearbeitung untersucht. In diesem Paper wird neben der verwendeten Beschichtungstechnologie detailliert auf die Schichteigenschaften eingegangen. Im Zusammenhang mit dem im Zerspanungstest gemessenen Verschleißverhalten und der Prozesskräfte werden anschließend Rückschlüsse auf das weitere Optimierungspotential dieser Schichtsysteme gezogen. Tool coatings for dry machining During dry machining a strain collective consisting of mechanical, thermal, and chemical loads is imposed upon the cutting edge. Compared to conventional machining using cooling lubrication fluids, the loads are increased in dry cutting. A feasible solution to protect the cutting edge from thermal wear, abrasion, and tribo-oxidation is the application of hard coatings. Newly developed CrxAlyYzN, CrxAlyBzN and CrxAlySizN PVD coatings were both evaluated in tribological model tests and machining tests concerning their suitability for dry cutting applications. Herein, the used coating technology and the coating properties are described in detail. The measured tool wear and the process forces give further hints for the optimization of the coating system. [source]

Verschleißreduzierung in hydraulischen Verdrängereinheiten durch Verwendung PVD-beschichteter Komponenten

MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK, Issue 10-11 2004
H. Murrenhoff
Wear; hydraulic system; PVD coating Abstract In hydrostatischen Verdrängereinheiten sind Komponenten und mineralölbasierte, meist hochadditivierte, Fluide für einen optimalen Betrieb aufeinander abgestimmt. Ein Wechsel zu niedrig oder unadditivierten Druckübertragungsmedien bedeutet den Verlust wichtiger Funktionsträger in den verschiedenen Tribokontakten. Im SFB 442 ,Umweltverträgliche Tribosysteme" wird dies durch die Übertragung der entsprechenden Funktionen auf die PVD-beschichteten Kontaktflächen kompensiert. Dabei werden gradierte Kohlenstoffschichten verwendet. Auf verschiedenen Prüfständen sind dabei maßgebliche Fortschritte beim Einsatz beschichteter Tribokontaktkörper gemacht worden. Wear reduction with PVD-coatings in hydrostatic displacement units Hydrostatic pumps and motors are most important parts of hydraulic systems. The majority of these systems is designed to be used with fluids, which are based on mineral oil and improved by numerous additives. These systems are a rather optimal synthesis of fluid and solids, developed in this unity to a high performing standard. A change to fluids, which are environmentally friendly, means the loss of environmental harmful additivs and though, among other things, an increasing friction and wear of the system. To compensate this loss of technically helpful additivs, their tribological functions have to be transferred to the surface of the solid parts. That may be done with coating the surfaces of the tribological contacts with PVD-coatings, like those based on ZrC-materials. Experiments on speciments and pistons have shown the potential of that method. [source]

Damage Phenomena Observed on PVD Coatings Submitted to Repeated Impact Tests

PLASMA PROCESSES AND POLYMERS, Issue S1 2007
Florent Ledrappier
Abstract Thin hard coatings obtained by PVD process are widely used to improve the mechanical and friction behaviour of industrial parts. Depending on the friction conditions, the failure mechanisms and resulting selection criteria may be very different. This study aims to investigate the endurance life of some PVD coatings under repeated impact conditions. Impact tests at controlled impact energy have been performed using a hemispherical tip. Long-term tests have been done to determine the coating endurance life while short tests enable us to identify the damage phenomena. Depending on the nature of the PVD coating, cracks, blisters or spalling may be observed under impact. These phenomena may worsen until the complete film rupture occurs. [source]

VmeCN Based Nanoscale Multilayer PVD Coatings Deposited by the Combined High Power Impulse Magnetron Sputtering/Unbalanced Magnetron Sputtering Technology

PLASMA PROCESSES AND POLYMERS, Issue S1 2007
Papken Eh.
Abstract TiAlCN/VCN has been deposited by the combined high power impulse magnetron sputtering/unbalanced magnetron sputtering (HIPIMS/UBM) technology using a Hauzer HTC 1000-4 PVD system. V+ ion flux has been generated by HIPIMS discharge to sputter-clean the substrates prior to the coating deposition. The sputtering was carried out in a mixed CH4, N2 and Ar atmosphere. Coatings phase and nanoscale structure were characterised using a variety of surface analysis techniques. In dry milling of Al 7010-T 7651 alloy, a TiAlCN/VCN nanoscale multilayer PVD coating outperformed state-of-the-art diamond-like carbon (DLC, Cr/WC/a-CH) coating by a factor of four. In drilling Al-alloy enforced MMC materials, cemented carbide drills coated with TiAlCN/VCN produced 130 holes compared to one to two holes with uncoated drills. [source]

Analyses of the Performance Potential of Oxidic PVD Wear-Protection Coatings on Cutting Tools Using the Example of Crystalline ,-Al2O3,

ADVANCED ENGINEERING MATERIALS, Issue 7 2008
F. Klocke
This paper focuses on the high performance potential of oxidic PVD coatings on cutting tools using the example of crystalline ,-Al2O3. The materials used during the cutting processes were the nickel-based alloy, Inconel 718, in wet-cut drilling and milling as well as a quenched and tempered steel in dry-cut milling. The conclusion that may be drawn from these analyses is that oxidic PVD coatings are characterised by outstanding wear behaviour and can contribute to a significant increase in cutting performance. [source]

Werkzeugbeschichtungen für die Trockenbearbeitung,

MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK, Issue 10 2006
E. Abele
PVD coating; tribology; dry machining; tool wear Abstract Bei der Trockenbearbeitung wirkt an der Werkzeugschneide ein Belastungskollektiv aus mechanischen, thermischen und chemischen Einflussgrößen. Im Vergleich zur konventionellen Bearbeitung unter Verwendung von Vollstrahl-Emulsionskühlung erhöht die Trockenbearbeitung die auf den Schneidkeil wirkenden Belastungen. Eine sehr gute Möglichkeit die Schneide vor thermischen, abrasiven und tribo-oxidativem Verschleißangriff zu schützen stellt die Verwendung von PVD Beschichtungen dar. Neu entwickelte PVD Beschichtungen aus CrxAlyYzN, CrxAlyBzN und CrxAlySizN- wurden sowohl im tribologischen Modelltest als auch im realen Zerspanungstest auf ihre Eignung zur Trockenbearbeitung untersucht. In diesem Paper wird neben der verwendeten Beschichtungstechnologie detailliert auf die Schichteigenschaften eingegangen. Im Zusammenhang mit dem im Zerspanungstest gemessenen Verschleißverhalten und der Prozesskräfte werden anschließend Rückschlüsse auf das weitere Optimierungspotential dieser Schichtsysteme gezogen. Tool coatings for dry machining During dry machining a strain collective consisting of mechanical, thermal, and chemical loads is imposed upon the cutting edge. Compared to conventional machining using cooling lubrication fluids, the loads are increased in dry cutting. A feasible solution to protect the cutting edge from thermal wear, abrasion, and tribo-oxidation is the application of hard coatings. Newly developed CrxAlyYzN, CrxAlyBzN and CrxAlySizN PVD coatings were both evaluated in tribological model tests and machining tests concerning their suitability for dry cutting applications. Herein, the used coating technology and the coating properties are described in detail. The measured tool wear and the process forces give further hints for the optimization of the coating system. [source]

Engineering and Design of Wear and Corrosion Resistant PVD Coatings Regarding the Exceptional Properties of Magnesium Substrates

PLASMA PROCESSES AND POLYMERS, Issue S1 2007
Holger Hoche
Abstract Although magnesium alloys were popular in the first half of the 20th century, the bad corrosion properties prevented their breakthrough in industrial mass production. Since the technology for the production of high purity alloys was introduced in the 1970s, magnesium alloys became more and more in the focus of industrial attention. Today magnesium alloys are state-of-the-art in construction parts in automotive industry. Despite its outstanding properties like good castability, low density and nearly unlimited availability the negative aspects like weak corrosion and wear behaviour still limit the application of magnesiums in industry, due to the need of sufficient surface protection (E. Aghion, B. Bronfin, Mater. Sci. Forum2000, 350,351, 19). Today, plasma electrolytic anodisations are state-of-the-art (H. Haferkamp, "Magnesiumkorrosion,Prozesse, Schutz von Anode und Kathode", in: Moderne Beschichtungsverfahren, F.-W. Bach, T. Duda, Eds., Wiley-VCH, Weinheim 2000, ISBN 3-527-30117-8, 242; M. Thoma, Metalloberfläche1984, 38, 393; T. W. Jelinek, Galvanotechnik2003, 94, 46; A. Kuhn, Galvanotechnik2003, 94, 1114). They provide acceptable corrosion resistance and protect the magnesium from mechanical damage due to their high hardness. On the other hand, their high porosity limits their use in combination with electrochemically noble materials, leading to galvanic corrosion (J. Senf, "Untersuchung und Beschreibung von Magnesiumdruckgusslegierungen unter tribologischer, korrosiver und mechanisch-korrosiver Beanspruchung, Berichte aus der Werkstofftechnik", Shaker Verlag, Germany 2001, ISBN 3-8265-8428-7). In addition, the high surface roughness of the plasma electrolytic anodisations restricts their use in tribological applications, particularly under sliding conditions (H. Hoche, "Grundlegende Untersuchungen zur Entwicklung von PVD-Beschichtungen auf Magnesiumlegierungen im Hinblick auf die Erhöhung der Verschleißbeständigkeit und unter Berücksichtigung des Korrosionsverhaltens", Dissertation, TU-Darmstadt D17, Shaker Verlag, Germany 2004). In order to achieve smooth surfaces with high quality, the PVD technology moves into the centre of interest. Since the 1980s PVD coatings are well established and widely used for different industrial applications, mainly for steel and tool coatings. The authors were the first who carried out serious studies on the development of PVD coatings for magnesium alloys in 1999 (J. Senf, "Untersuchung und Beschreibung von Magnesiumdruckgusslegierungen unter tribologischer, korrosiver und mechanisch-korrosiver Beanspruchung, Berichte aus der Werkstofftechnik", Shaker Verlag, Germany 2001, ISBN 3-8265-8428-7; H. Hoche, "Grundlegende Untersuchungen zur Entwicklung von PVD-Beschichtungen auf Magnesiumlegierungen im Hinblick auf die Erhöhung der Verschleißbeständigkeit und unter Berücksichtigung des Korrosionsverhaltens", Dissertation, TU-Darmstadt D17, Shaker Verlag, Germany 2004). The extensive research activities lead to the recent development of a coating system, which provides both, good wear properties as well as good corrosion behaviour. [source]

Damage Phenomena Observed on PVD Coatings Submitted to Repeated Impact Tests

PLASMA PROCESSES AND POLYMERS, Issue S1 2007
Florent Ledrappier
Abstract Thin hard coatings obtained by PVD process are widely used to improve the mechanical and friction behaviour of industrial parts. Depending on the friction conditions, the failure mechanisms and resulting selection criteria may be very different. This study aims to investigate the endurance life of some PVD coatings under repeated impact conditions. Impact tests at controlled impact energy have been performed using a hemispherical tip. Long-term tests have been done to determine the coating endurance life while short tests enable us to identify the damage phenomena. Depending on the nature of the PVD coating, cracks, blisters or spalling may be observed under impact. These phenomena may worsen until the complete film rupture occurs. [source]