Werkstoffkunde für Ingenieure

Roos, Eberhard; Maile, Karl

doi:10.1007/978-3-642-54989-2

Cited by 13 publications

(19 citation statements)

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“…Corrosion behaviour depends on material, corrosive agents, temperature, flow conditions and stress . This paper presents the properties of different metallic materials and types of corrosion which can occur in the brines depending on water chemistry and mechanical stress.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of corrosion of materials for application in geothermal systems in Central Europe

Iberl

Alt

Schluecker

2014

Materials & Corrosion

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The systematic and comprehensive evaluation of corrosion experiments in geothermal waters in Central Europe shows that the pitting resistance equivalent number (PREN) provides information on the potential chemical resistance of materials. The analysis exhibits that tested stainless steels (PREN ≥ 45), nickel‐based alloys (PREN ≥ 44) and titanium materials show a resistant behaviour in the North German – Polish Basin. In the Upper Rhine Graben most carbon steels, nickel based alloys (PREN > 40) and titanium materials are stable. Austenitic and duplex steels are resistant with a PREN ≥ 35 for temperatures up to 80 °C and with a PREN ≥ 45 for higher temperatures. In the Molasse Basin carbon steels and stainless steels are stable.

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Section: Introductionmentioning

confidence: 99%

Evaluation of corrosion of materials for application in geothermal systems in Central Europe

Iberl

Alt

Schluecker

2014

Materials & Corrosion

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“…In Figure b, the formation of three distinct Zn x Cu y phase areas is apparent in the EDX linescan. Based on their appearance in the light microscopic images, their relative positions in the bonding zone and their chemical compositions it was assumed that these were the ϵ ‐phase (80–87 at% Zn), the γ ‐phase (64–67 at% Zn), and the β ’‐phase (50 at% Zn) . By contrast, the microstructure of the specimen that was cooled in air exhibited two, albeit wider phase seams.…”

Section: Resultsmentioning

confidence: 99%

Thermal Properties of Intermetallic Phases at the Interface of Aluminum–Copper Compound Castings

et al. 2018

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High-pressure die compound casting relies on high bond quality, and high thermal contact conductance at the interface is a key issue in the context of cast advanced cooling components, such as lightweight heat sinks for desktop and portable computers. The current study aims at enhancing the thermal contact between a copper insert piece and an AlSi9Cu3(Fe) cast alloy by developing suitable Zn-based coatings, which are used to establish a firm metallurgical bond between the solid insert and the cast alloy during highpressure die-casting. It is demonstrated by microstructural analyses that various phases form at the interfaces in the casting process. As the thermal conductivities of these phases have not been available, these are determined individually using a thermoflash device. The SEM investigations indicate that mainly ternary phases of the type Al x Cu y Zn z emerge in the bonding zone, as the high casting temperatures promote the diffusion of aluminum atoms into the coating. Interestingly, an alloy containing 50 wt% zinc reaches a thermal conductivity as high as 166 W mK À1 . The microstructural characteristic at the interfaces and the ramifications with respect to applications are discussed.

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“…In Table 3, several rotor armor materials are shown with their respective mechanical properties [42]. For a given number of phases, pole pairs, and slots, Cai et al [37] demonstrated that an optimal MMF spectrum exists as the best approximation of the ideal spectrum that can be determined by solving a linear equation system.…”

Section: Rotor Armoringmentioning

confidence: 99%

“…In Table 3, several rotor armor materials are shown with their respective mechanical properties [42]. The values of the tensile strength and the Young's modulus for fibre materials are orthotropic values in the direction of the fibres.…”

Section: Rotor Armoringmentioning

confidence: 99%

Challenges and Opportunities of Very Light High-Performance Electric Drives for Aviation

et al. 2018

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Abstract:The demand for alternative fueling methods to reduce the need for fossil fuels is not limited to the electrification of ground vehicles. More-electric and all-electric aircraft pose challenges, with extensive requirements in terms of power density, efficiency, safety, and environmental sustainability. This paper focuses on electrical machines and their components, especially for high-power applications like the main propulsion. The electrical machine is evaluated from different aspects, followed by a closer look at the components and materials to determine the suitability of the current standard materials and advanced technologies. Furthermore, the mechanical and thermal aspects are reviewed, including new and innovative concepts for the cooling of windings and for the use of additive manufacturing. Aircraft have special demands regarding weight and installation space. Following recent developments and looking ahead to the future, the need and the possibilities for light and efficient electrical machines are addressed. All of the approaches and developments presented lead to a better understanding of the challenges to be expected and highlight the upcoming opportunities in electrical machine design for the use of electric motors and generators in future aircraft. Several prototypes of electrical machines for smaller aircraft already exist, such as the electric drive of the Siemens powered Extra 330LE. The focus of this paper is to provide an overview of current technical possibilities and technical interrelations of high performance electric drives for aviation. A 1 MW drive is exemplified to present the possibilities for future drives for airplanes carrying a larger number of passengers. All presented techniques can also be applied to other drive power classes.

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Werkstoffkunde für Ingenieure

Cited by 13 publications

References 0 publications

Evaluation of corrosion of materials for application in geothermal systems in Central Europe

Evaluation of corrosion of materials for application in geothermal systems in Central Europe

Thermal Properties of Intermetallic Phases at the Interface of Aluminum–Copper Compound Castings

Challenges and Opportunities of Very Light High-Performance Electric Drives for Aviation

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