Statistical Analysis of the Flexural Strength of Free-Standing Flame-Sprayed Alumina Coatings Prior and After Thermal Shock

Neumann, Marc; Gehre, Patrick; Hubálková, Jana; Zielke, H.; Abendroth, Martin; Aneziris, Christos G.

doi:10.1007/s11666-020-01114-6

Cited by 9 publications

(2 citation statements)

References 15 publications

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“…Durch das Ausbrennen vom Graphitsubstrat wurden mit dem atmosphärischen Plasmaspritzen hergestellte CoNiCrAlY-Schichten vom Substrat entfernt [9]. Flammgespritzte Aluminiumoxidschichten wurden mechanisch vom Graphitsubstrat abgelöst [10]. Freistehende aluminiumoxidbasierte Schichten wurden mithilfe einer Kohlenstoffschicht als Trennschicht hergestellt [11].…”

Section: Introductionunclassified

Process development for the production of free‐standing titanium coatings with plasma spraying

Bobzin,

Zhao,

Heinemann

et al. 2023

Materialwissenschaft Werkst

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Poröse Transportschichten aus Titan bilden einen wichtigen Bestandteil für die Polymerelektrolytmembran‐Wasserelektrolyse. In der Forschung wird bereits aufgezeigt, dass poröse Transportschichten durch das Vakuumplasmaspritzen hergestellt werden können. Dazu werden Titanschichten durch die Ablösung vom Stahlsubstrat mit Hilfe einer Schwefelsäure‐Lösung hergestellt. Im Rahmen dieser Veröffentlichung werden neue Prozesse zur Herstellung freistehender Titanschichten verfolgt. Dazu wurden Titanschichten mit dem atmosphärischen Plasmaspritzen auf verschiedene Substrate aus kohlenstofffaserverstärktem Kohlenstoff, austenitischem Stahl sowie Titan appliziert. Die Temperatur der Proben wurde beim Beschichten mit einer Thermokamera erfasst. Titanschichten wurden mechanisch bzw. mit Hilfe der Ablösung einer Natriumchloridschicht im Wasser vom Substrat abgetrennt. Die Topografie der Substrate sowie der Titanschichten wurden mit dem konfokaler Laserscanning‐Mikroskop untersucht. Die Schichtstruktur der Titanschichten sowie die Oberfläche der Natriumchloridschicht wurden mithilfe von Rasterelektronenmikroskopie analysiert. Die Ergebnisse zeigen, dass die Titanschicht auf Basis der Eigenspannung im Schichtsystem vom Substrat aus kohlenstofffaserverstärktem Kohlenstoff mechanisch abgetrennt werden konnte. Die Neigung zur Schichtabtrennung vom Stahlsubstrat ist jedoch abhängig von den eingestellten Prozessparametern. Im Vergleich zu einer rein mechanischen Schichtablösung ermöglicht eine Natriumchlorid‐Zwischenschicht auf dem Titansubstrat eine deutlich höhere Zuverlässigkeit und Reproduzierbarkeit der Schichtablösung.

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Section: Introductionunclassified

Process development for the production of free‐standing titanium coatings with plasma spraying

Bobzin,

Zhao,

Heinemann

et al. 2023

Materialwissenschaft Werkst

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“…Such free-standing coatings allow measurements of properties that are difficult or rather impossible to determine with a substrate underneath. These measurements can be mechanical tests, e.g., for the evaluation of Young's modulus [1], bending strength [2], creep [3,4] or sintering properties [5][6][7], toughness [8], and crack propagation [9,10]. Additionally, functional properties like thermal diffusivity [11], optical properties [12], phase evolution [13], and attack by corrosive species as Calcium-Magnesium-Aluminum-Silicate (CMAS, [14]) are measured on free-standing coatings.…”

Section: Introductionmentioning

confidence: 99%

Influence of Substrate Removal Method on the Properties of Free-Standing YSZ Coatings

2021

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Thermally sprayed ceramic coatings are often tested as free-standing layers to investigate different properties such as thermal expansion coefficient, thermal conductivity, sintering, mechanical behavior, corrosion resistance, gas tightness, or electrical properties. In this paper, four different substrate removal methods were used to obtain free-standing YSZ coatings. At first, spraying on a steel substrate and subsequent dissolution of the substrate-coating interface by hydrochloric acid (HCl) was used. Second, the steel substrate was removed by applying an electrical field via electrochemical corrosion of the surface of the substrate. In a third method, the coating was sprayed on a salt (NaCI) interlayer, which was removed later by dissolution in water. At last, the coating was sprayed on a graphite substrate and the substrate was removed by heat treatment. After the preparation of free-standing coatings, these were characterized using scanning electron microscopy, mercury porosimetry, indentation tests, and room temperature three-point bending tests, which allowed the determination of Young’s modulus and viscosity. The results revealed measurable differences in coating properties as a result of the substrate removal methods, i.e., HCl method led to higher porosity and lower modulus in the YSZ coating.

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Carbon-Bonded Filter Materials and Filter Structures with Active and Reactive Functional Pores for Steel Melt Filtration

Bock-Seefeld,

Gehre,

Aneziris

2024

Springer Series in Materials Science

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There exists an increasing pressure on the metal making and metal using industry to remove solid and liquid inclusions such as deoxidation products, sulfides, nitrides carbides etc. and thereby improve metal cleanliness. It is well known that size, type and distribution of non-metallic inclusions in metal exert considerable effects on the mechanical properties of the cast products. In terms of this contribution a new generation of metal qualities via melt filtration with superior mechanical properties for use in light weight structures and high demand construction materials are explored. The main target is an enormous reduction of non-metallic inclusions in the metal matrix by the use of intelligent filter materials as well as filter systems with a functionalized filter surface. Especially a new generation of combined refining filter systems will be illustrated. The metal melt comes first in contact with a reactive filter which generates gas bubbles in the melt as well as activates gas bubbles on the surface of the inclusions. As a result, a kind of flotation of the inclusions towards the slag on the surface of the melt takes place. Further the high reactivity as well as the gas bubbles contribute to the agglomeration of the fine inclusions to big clusters which flow due to buoyancy forces to the surface of the melt or are filtrated on the surface of active filters, which do not form gas bubbles but provide on their functionalized surfaces the same chemistry as the inclusions for a sufficient adhesion and as a result for a sufficient filtration of the inclusions. With this approach a purification higher than 95% can be achieved. Another topic is dealing with carbon-bonded filter materials based on environmentally friendly binder system based on lactose and tannin. Furthermore, functional calcium aluminate coatings in combination with carbon are studied with regard to their impact on the active/reactive filtration and flotation in steel melts, respectively. Another major focus is the investigation of water-soluble filter skeleton-templates, which are produced by 3D-hybrid-printing techniques and coated by flame spraying technology. Subsequently, the filter skeleton-templates are removed in water, avoiding sharp-edged cavities inside the filter.

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Statistical Analysis of the Flexural Strength of Free-Standing Flame-Sprayed Alumina Coatings Prior and After Thermal Shock

Cited by 9 publications

References 15 publications

Process development for the production of free‐standing titanium coatings with plasma spraying

Process development for the production of free‐standing titanium coatings with plasma spraying

Influence of Substrate Removal Method on the Properties of Free-Standing YSZ Coatings

Carbon-Bonded Filter Materials and Filter Structures with Active and Reactive Functional Pores for Steel Melt Filtration

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