Ingenieurwissenschaften und zugeordnete Tätigkeiten
Filtern
Erscheinungsjahr
Dokumenttyp
- Posterpräsentation (797) (entfernen)
Sprache
- Englisch (663)
- Deutsch (133)
- Französisch (1)
Schlagworte
- Corrosion (36)
- Additive manufacturing (30)
- Mechanochemistry (24)
- Additive Manufacturing (20)
- Glass (20)
- Nanoparticles (19)
- Crystallization (17)
- Degradation (14)
- Fluorescence (14)
- In situ (14)
Organisationseinheit der BAM
- 6 Materialchemie (203)
- 5 Werkstofftechnik (97)
- 8 Zerstörungsfreie Prüfung (95)
- 6.3 Strukturanalytik (65)
- 8.5 Röntgenbildgebung (60)
- 6.6 Physik und chemische Analytik der Polymere (55)
- 9 Komponentensicherheit (53)
- 1 Analytische Chemie; Referenzmaterialien (45)
- 6.1 Oberflächen- und Dünnschichtanalyse (44)
- 4 Material und Umwelt (36)
- 7 Bauwerkssicherheit (34)
- 5.1 Mikrostruktur Design und Degradation (28)
- 6.0 Abteilungsleitung und andere (26)
- 1.2 Biophotonik (25)
- 5.4 Multimateriale Fertigungsprozesse (22)
- 8.0 Abteilungsleitung und andere (21)
- 9.4 Integrität von Schweißverbindungen (20)
- 4.1 Biologische Materialschädigung und Referenzorganismen (19)
- 5.2 Metallische Hochtemperaturwerkstoffe (19)
- 5.6 Glas (19)
- 6.2 Material- und Oberflächentechnologien (19)
- 9.3 Schweißtechnische Fertigungsverfahren (19)
- 2 Prozess- und Anlagensicherheit (14)
- 6.5 Synthese und Streuverfahren nanostrukturierter Materialien (13)
- 7.1 Baustoffe (13)
- 6.7 Materialsynthese und Design (12)
- 3 Gefahrgutumschließungen; Energiespeicher (11)
- 4.2 Material-Mikrobiom Wechselwirkungen (11)
- 7.6 Korrosion und Korrosionsschutz (11)
- 5.3 Polymere Verbundwerkstoffe (8)
- 7.5 Technische Eigenschaften von Polymerwerkstoffen (8)
- 9.6 Additive Fertigung metallischer Komponenten (8)
- 1.9 Chemische und optische Sensorik (7)
- 8.4 Akustische und elektromagnetische Verfahren (7)
- 1.4 Prozessanalytik (6)
- 9.0 Abteilungsleitung und andere (6)
- 2.5 Konformitätsbewertung Explosivstoffe/Pyrotechnik (5)
- 3.1 Sicherheit von Gefahrgutverpackungen und Batterien (5)
- 4.5 Kunst- und Kulturgutanalyse (5)
- 8.1 Sensorik, mess- und prüftechnische Verfahren (5)
- 9.5 Tribologie und Verschleißschutz (5)
- 1.6 Anorganische Referenzmaterialien (4)
- 2.0 Abteilungsleitung und andere (4)
- 5.5 Materialmodellierung (4)
- 8.3 Thermografische Verfahren (4)
- 9.2 Versuchsanlagen und Prüftechnik (4)
- 2.1 Sicherheit von Energieträgern (3)
- 4.0 Abteilungsleitung und andere (3)
- 7.2 Ingenieurbau (3)
- 8.2 Zerstörungsfreie Prüfmethoden für das Bauwesen (3)
- 8.6 Faseroptische Sensorik (3)
- VP Vizepräsident (3)
- VP.1 eScience (3)
- 1.1 Anorganische Spurenanalytik (2)
- 1.5 Proteinanalytik (2)
- 2.2 Prozesssimulation (2)
- 3.2 Gefahrguttanks und Unfallmechanik (2)
- 3.4 Sicherheit von Lagerbehältern (2)
- 1.8 Umweltanalytik (1)
- 3.0 Abteilungsleitung und andere (1)
- 3.3 Sicherheit von Transportbehältern (1)
- 3.6 Elektrochemische Energiematerialien (1)
- 5.0 Abteilungsleitung und andere (1)
- 6.4 Materialinformatik (1)
- 7.4 Baustofftechnologie (1)
- MP Mitglied des Präsidiums (1)
- MP.0 Mitglied des Präsidiums und andere (1)
- P Präsident (1)
- PST Präsidiale Stabsstelle (1)
Eingeladener Vortrag
- nein (1)
In this study, series of coatings with the goal of sensitising gold SPR sensors towards CO, NH4, etc. were prepared. To better understand the mechanism behind the sensitizing effect and to enable the targeted production of optimized layers, the wide range of coatings was studied by multiple methods from spectroscopic ellipsometry for their dielectric function, by XPS for chemical composition and SEM, TEM to determine their microscopic structure. The coatings were deposited at inert Ar gas and reactive Ar/O2 gas mixture by RF magnetron sputtering or DC pulsed magnetron sputtering with settable RF bias on the substrates. The plasma processes were monitors by mass spectrometry.
The metal oxide coatings in SPR sensors have to be prepared reproducible with thickness about 5 nm therefore lower deposition rate conditions were advantages.
Mechanochemistry is increasingly used for synthesizing soft matter materials including metal organic compounds and cocrystals. The ever-increasing interest in this method is contrasted by a limited mechanistic understanding of the mechanochemical reactivity and selectivity. Time-resolved in situ investigations of milling reactions provide direct insights in the underlying mechanisms. We recently introduced a setup enabling in situ investigation of mechanochemical reactions using synchrotron XRD combined with Raman spectroscopy. The specific combination allows to study milling processes comprehensively on the level of the molecular and crystalline structure and thus obtaining reliable data for mechanistic studies. In situ Raman spectroscopy coupled with thermography revealed a low temperature increase during milling reactions due to the mechanical impact and clear temperature increases because of the reaction heat.
Based on the data, temperature rises as postulated in the magma plasma and hot spot theory can be excluded for soft matter milling syntheses. Our results indicate that in situ investigation of milling reactions offer a new approach to tune and optimize mechanochemically synthesized compounds.
During Rutherford cable production the wires are plastically deformed and their initially round shape is distorted. Using X-ray absorption tomography we have determined the 3D shape of an unreacted Nb3Sn 11 T dipole Rutherford cable, and of a reacted and impregnated Nb3Sn cable double stack. State-of-theart image processing was applied to correct for tomographic artefacts caused by the large cable aspect ratio, for the segmentation of the individual wires and subelement bundles inside the wires, and for the calculation of the wire cross sectional
area and shape variations. The 11 T dipole cable cross section oscillates by 2% with a frequency of 1.24 mm (1/80 of the transposition pitch length of the 40 wire cable). A comparatively stronger cross sectional area variation is observed in the individual wires at the thin edge of the keystoned cable where the wire aspect ratio is largest.
Bei der Bewertung der Verlässlichkeit der im Labor gewonnenen Prüfergebnisse spielen Ringversuche eine entscheidende Rolle. Die Bundesanstalt für Materialforschung und –prüfung (BAM) unterstützt deshalb den weiteren Ausbau des Ringversuchsprogramms des im Jahr 2007 gegründeten Kompetenzzentrums zur Qualitätssicherung für Prüfungen von Gefahrgütern und Gefahrstoffen auf physikalische Gefahren (Centre for quality assurance for testing of dangerous goods and hazardous substances, CEQAT-DGHS).
Bei allen bisher untersuchten Prüfmethoden besteht ein Verbesserungsbedarf. Die RV müssen daher zunächst auf die Methodenentwicklung, -verbesserung und -validierung und auf die Bestimmung der Messunsicherheit der jeweiligen Prüfmethode abzielen und nicht auf Leistungstests.
Geothermieanlage werden teilweise unter extremen Bedingungen mit sehr salzhaltigen Wässern betrieben. Obwohl C-Stahl häufig für die Konstruktion verwendet wird, ist er in einem Hoch-temperatur- und Hochdrucksystem anfällig für gleichmäßige und örtliche Korrosion. Daher soll ein Beschichtungssystem den C-Stahl schützen.
Schlussverfolgung
Es ist notwendig, die optimale SiO2-Zugabe zur organischen Beschichtung zu untersuchen, damit deren Eigenschaften, wie z.B. Haftfestigkeit, optimale Schichtdicke, und
Temperaturbeständigkeit, verbessert werden.
Das derzeitige Projekt zielt auf die Zugabe von Polyanilin (PANi) als Wirkstoff zur Verbesserung der Schichteigenschaften für die Erhöhung der Korrosionsbeständigkeit des Systems in stark salzhaltigen Medien bei höheren Temperaturen.
Geothermal brine is considered to be an aggressive environment as it contains various dissolved salts. Even though carbon steel is commonly used as a construction material due to its machinability and economical reason, it is susceptible to uniform and localized corrosion in a high temperature and high pressure system. Therefore, a coating system is introduced to protect the carbon steel against corrosion in such environment.
-It is necessary to find the optimum composition of SiO2 addition in the organic coatings to enhance the material performance, i.e. coatings adhesion, thickness optimization, thermal resistance.
Current project aims at the addition of Polyaniline (PANi) as the active agent to improve the corrosion resistance of materials against a high saline medium at elevated temperatures.
Methanogenic Archaea
(2017)
Different environmental samples reveal that methanogenic Archaea are part of a multi-species biofilm on corroding metallic structures. Studies on microbial influenced corrosion (MIC) focus mainly on sulphate reducing Bacteria (SRB), leading to the assumption that they are exclusively responsible for metal corrosion. In fact, methanogenic Archaea are known to be involved in metal corrosion as well (e.g. Methanococcus maripaludis DSM 2067). In some cases SRB and methanogenic Archaea have comparable high corrosion rates. However, the underlying mechanisms causing corrosion are still unknown.
The goal of this study is to develop suitable methods for analyzing two environmental isolates (M. maripaludis DSM 2067, M. maripaludis KA1) and two human-related isolates (Methanobrevibacter oralis and Methanobrevibacter smithii) for their ability to deteriorate/transform metals, which are relevant for technical and clinical applications. Moreover, the studies will provide essential information on the interaction mechanisms of human-related Archaea, which are frequently found in peri-implantitis, with dental material such as implants, crowns and bridges leading to their degradation and transformation.
A research project of reconstructing historical gold mosaics deals with reconstructing weatherproof gold and silver mosaics according to historical models.
The gold mosaics examinded originate mainly from germany from 1880 to 1920 and are composed of three parts. They consist of a matching support glass, the gold or silver layer and a cover glass. By examining the morphology and layer thicknesses with the ESEM, and using chemical analysis with the EDX, the relationship of glass composition and damage patterns was established. The glass analysis provided quantitative composition data and made it possible to determine its chemical stability. It supplied the basis for calculating glass characteristics and was referred to when casting suitable historical mosaic glass. The analysis of the qualitative composition of the gold and silver layers also served as a model for reconstruction. After testing selected reconstructed gold mosaics in the climate chamber, the ESEM was used for capturing leaching and other process data and the glass composition was optimized accordingly. Over 100 predominantly historical gold mosaics were analyzed and the results entered into a database which can now be consulted for comparative investigations to determine both origin and date.
Nuclear magnetic resonance (NMR) is a well established laboratory / borehole method to characterize the storage and transport properties of rocks due to its direct sensitivity to the corresponding pore fluid saturation (water or oil) and pore sizes.
For petrophysical applications there are several different NMR laboratory devices commercially available varying over a wide range of e.g. magnetic field strength / frequency (2 MHz to 30 MHz), applicable measurement protocols (T1, T2, T1-T2, T2-D, etc.) and sample sizes (2.5 cm to 10 cm in diameter). In this work we present NMR measurements, layed out in a round robin like manner, on a set of 20 sandstone samples. We use three different NMR devices containing two standard setups with homogenous magnetic fields (LIAG and RWTH) and one single-sided setup with gradient field (BGR) to measure T1 and T2 relaxation data. In our evaluation we especially focus on the comparison of the individually inverted relaxation time distributions to quantify the differences arising from different laboratory setups. Diverging results can be deduced on the one hand to the inherit differences between homogeneous and gradient fields but on the other hand also due to quality differences between the two homogeneous setups. Additionally, we also examine the influence of the individually chosen inversion parameters (signal processing, distribution sampling points, error weighting, regularization, etc.) to establish a general standardized best practice recommendation for future petrophysical NMR laboratory measurements.