Gegen Flußsäure korrosionsbeständige Werkstoffe

Hauffe, K.

doi:10.1002/mawe.19850160805

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…Nickel based superalloys are widely used for components operating in hostile environments due to their ability to maintain their strength and withstand corrosion and oxidation at elevated temperatures . Hastelloy‐C276 is one variation of corrosion‐resistant NiMo superalloys and known for its strong resistance to oxidizing agents, acids and several chlorine solutions which makes it widely applied in chemical and environmental engineering as well as in oil and gas industries . The surface finish of components operating in this type of applications is highly concerned since most of the failures are initiated from surface defects, thus, several studies are concerned about surface damages and the mechanism of their formation in machining nickel based superalloys .…”

Section: Introductionmentioning

confidence: 99%

Surface damages and tool wear mode in end milling of hastelloy‐C276 under dry and wet conditions

Al-Falahi¹,

Fadaeifard

Baharudin

et al. 2016

Materialwissenschaft Werkst

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Hastelloy‐C276 is a nickel based superalloy that is widely used in chemical, petro‐chemical, environmental and nuclear industries due to its outstanding performance in a wide range of corrosive mediums. The superior properties of nickel based superalloys impair their machinability which increases the difficulty in obtaining a good surface finish. Because most of the components' failures are initiated from surface defects, several researchers have been concerned about surface integrity in machining aerospace superalloys particularly Inconel‐718. Due to the lack of studies done on machining corrosion‐resistant superalloys, this study aims to investigate surface damages and tool wear modes in milling Hastelloy‐C276 under dry and wet conditions. The absence of cooling and lubricating actions in dry machining resulted in the formation of craters, severe plastic deformation, voids, debris re‐deposition and materials drag. The breakage of the nucleated carbide phases resulted in the formation of nucleated cavities on the machined surface in both wet and dry machining. Adhesive tool wear was less in dry machining due to the formation of oxide layers on tool faces which suppressed the formation of built‐up edges due to the weak adhesion properties of oxide compounds which resulted in less surface roughness at vc = 50 m/min. On the other hand, the higher temperature and friction in dry machining resulted in severer tool coating delamination.

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Section: Introductionmentioning

confidence: 99%

Surface damages and tool wear mode in end milling of hastelloy‐C276 under dry and wet conditions

Al-Falahi¹,

Fadaeifard

Baharudin

et al. 2016

Materialwissenschaft Werkst

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“…Only a few metals are corrosion resistant against both reactants. These include platinum, palladium, gold, nickel and nickel alloys (especially monel) [18,19]. Metal microchannels can be fabricated by micromilling, etching or laser machining into the metal substrate [12].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of three-dimensional freestanding metal micropipes for microfluidics and microreaction technology

Lang¹,

Neiß²,

Woias³

2011

J. Micromech. Microeng.

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In this paper, we describe a simple and novel fabrication process to produce three-dimensional freestanding metal micropipes. This process is based on conventional micromachining and electroless nickel plating inside a microfluidic channel of structured and stacked silicon substrates. The nickel micropipe resists an etching with KOH, which facilitates to fabricate freestanding, functional micropipes. The in-channel electroless plating achieves a continuous and homogeneous deposition of nickel and shows an accurate coating of small microstructures down to 20 μm. Furthermore, the deposited nickel layers possess a high tensile strength for bonding (>200-300 N mm −2 ), are chemically inert against fluorine gas and withstand pressures up to 6 bar. Thermal measurements have shown that released micropipes show better heat flux densities than embedded micropipes with 86% at a cooling flow rate of 16 ml h −1 . Hence, released micropipes feature accurate control of the temperature in the micropipe via a variance of the cooling fluid flow rate.

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