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- Niobium carbide (NbC) (5)
- Tungsten carbide (WC) (4)
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- Niobcarbid (1)
- Niobcarbid (NbC) (1)
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Organisationseinheit der BAM
Maintenance, Repair and Overhaul (MRO) is acquiring increasing commercial and socio-economic significance. For products and goods with high investment costs and a long lifespan, especially in the sectors of energy and transportation, a considerable portion of commercial profits are generated by after-sales services. In the field of research and development, not enough attention has been paid so far to tasks and approaches involving MRO. The field thus has a limited scientific background, despite a high potential in the business sector for technological and scientific optimization. The challenges and chances of MRO for sustainable enterprises will be explained with reference to the Fraunhofer Innovation Cluster Maintenance, Repair and Overhaul in Energy and Transport. The developments and project results of the four fields of innovation »Cleaning«, »Repair and Overhaul«, »Condition Monitoring and Diagnosis«, as well as »MRO Planning and Digital Assistance« will be explained.
The ultra–precision cutting of steel materials is possible but needs modifications of machine tools or the workpiece material. One approach of actual research is the development of cutting materials that gives the opportunity for direct cutting of surfaces with ultra–precision quality. Binderless–cBN is here one of the most promising materials. The paper shows results of experimental studies with binderless–cBN as cutting material while turning stainless steel. Various investigations were carried out to determine the wear mechanisms. Furthermore, measurements are shown regarding the surface quality. The achieved results show the high potential ofbinderless–cBN as cutting material for the machining of steel.
Evaluating innovative process technologies has become highly important within the last decades. As standard tools different Life Cycle Assessment methods have been established, which are continuously improved. While those are designed for evaluating single processes they run into difficulties when it comes to assessing environmental impacts of process innovations at macroeconomic level. In this paper we develop a multi-step evaluation framework building on multi regional inputeoutput data that allows estimating macroeconomic impacts of new process technologies, considering the network characteristics of the global economy.
Our procedure is as follows: i) we measure differences in material usage of process alternatives, ii) we identify where the standard processes are located within economic networks and virtually replace those by innovative process technologies, iii) we account for changes within economic systems and evaluate impacts on emissions.
Within this paper we exemplarily apply the methodology to two recently developed innovative technologies: longitudinal large diameter steel pipe welding and turning of high-temperature resistant materials. While we find the macroeconomic impacts of very specific process innovations to be small, its conclusions can significantly differ from traditional process based approaches. Furthermore, information gained from the methodology provides relevant additional insights for decision makers extending the picture gained from traditional process life cycle assessment.
Niobcarbid (NbC) stellt aufgrund vorteilhafter Eigenschaften, wie zum Beispiel eine geringe Diffusionsneigung, in der Zerspannung eine vielversprechende Alternative zu konventionellen Schneidstoffen wie Wolframcarbid (WC) dar. Als Substitution der Hartstoff-Phase WC im Hartmetall wird NbC in der trockenen Drehbearbeitung von eisen-basierten Werkstoffen untersucht. Diesbezüglich wurden zwei NbC-Substrate mit WC hinsichtlich ihres Werkzeugverschleißes quantitativ verglichen. Im Gegensatz zu WC-Werkzeugen wird das Potential von NbC bei zunehmender Schnittgeschwindigkeit vc durch eine steigende Prozessstabilität deutlich.
Komplexe Bauteile ohne Fügestellen sind die Spezialität additiver Verfahren. Immer deutlicher wird der Wert dieser Technologie für den Turbomaschinenbau, etwa bei der Fertigung von Turbinenschaufeln mit inneren Kühlstrukturen. Wichtig für vorbildgetreue Turbinenkomponenten: Die Technologie ermöglicht die Fertigung von Freiformen und Hinterschnitten, von außen- und innenliegenden filigranen, komplexen Strukturen als Einzelteil - und das in einem einzigen Arbeitsschritt. Des Weiteren benötigen additive Verfahren keine formgebenden Werkzeuge und weisen demnach kürzere Prozessketten im Vergleich zu konventionellen Herstellungsverfahren auf. Wirtschaftliche Vorteile kommen vor allem bei kleinen Losgrößen und Bauteilabmessungen zur Geltung.
In diesem Artikel werden am Beispiel einer Turbinenschaufel Schlüsseltechnologien einer additiven Prozesskette gezeigt. Zunächst erfolgt die additive Fertigung einer Turbinenschaufel mittels Selective Laser Melting (SLM). Das Verfahren ermöglicht die Integration innenliegender Kühlkanäle. An dieser Schaufel wird anschließend mittels Laser-PulverAuftragschweißen (LPA) die Reparatur unterschiedlicher Beschädigungen demonstriert. Im nächsten Schritt der Prozesskette bietet ein optischer 3D-Scan der Schaufel die Möglichkeit zur Qualitätskontrolle und zum Vergleich der Bauteilabmessungen mit der Sollgeometrie.
The Federal Institute for Materials Research and Testing (BAM) and the Institute for Machine Tools and Factory Management (IWF) of the Technical University Berlin analyzed the suitability of various NbC types in comparison to tungsten carbide (WC) for use as a tool in cutting processes. The focus was placed on the optimization of the functional profile of NbC-based cutting materials with reproducible industrial production.