Filtern
Erscheinungsjahr
Dokumenttyp
- Zeitschriftenartikel (62)
- Beitrag zu einem Tagungsband (30)
- Beitrag zu einem Sammelband (19)
- Forschungsbericht (3)
- Buchkapitel (1)
- Vortrag (1)
- Sonstiges (1)
- Posterpräsentation (1)
Schlagworte
- Corrosion (6)
- Corrosion testing (6)
- Deckschichtbildung (6)
- KorroPad (6)
- Korrosionsprüfung (6)
- Zinc coatings (6)
- Broadband dielectric spectroscopy (5)
- Gel-type electrolytes (5)
- Gelartige Elektrolyte (5)
- Molecular mobility (5)
- Nanocomposites (5)
- Zinkdeckschichten (5)
- Fehlstellen (4)
- Layer formation (4)
- Minderdicken (4)
- Polymers of intrinsic microporosity (4)
- ZfP an Holzbauteilen (4)
- Bauwesen (3)
- Fäulnis (3)
- Gas permeation (3)
- Holz (3)
- Korrosion (3)
- Martensitic stainless steel (3)
- Neutron scattering (3)
- Nichtrostender Stahl (3)
- PIM-1 (3)
- Pitting corrosion (3)
- Polyhedral oligomeric silsesquioxane (POSS) (3)
- Polymer-based nanocomposites (3)
- SAXS (3)
- Stainless steel (3)
- Ultraschall-Echo (3)
- Ultraschallecho (3)
- Ultraschallecho-Experimente an Probekörpern (3)
- Zerstörungsfreie Prüfung (3)
- Advanced calorimetry (2)
- Aluminium (2)
- Atmosphärische Korrosion (2)
- Boson peak (2)
- Dielectric properties (2)
- Dielectric spectroscopy (2)
- Electrical conductivity (2)
- Electrochemical potentiodynamic reactivation (2)
- Gas separation (2)
- Gas separation membranes (2)
- Grinding (2)
- Heat treatment (2)
- Korrosionsschutz (2)
- Maritime Atmosphäre (2)
- Maritime atmosphere (2)
- Nanoparticle (2)
- Nanoparticles (2)
- Neutron Scattering (2)
- POSS (2)
- Polycarbonates (2)
- Polymer of intrinsic microporosity (2)
- Polymers of Intrinsic Microporosity (2)
- Polymers with intrinsic microporosity (2)
- Polynorbornenes (2)
- Quality control (2)
- Qualitätskontrolle (2)
- Quasielastic neutron scattering (2)
- Radar (2)
- Relaxation (2)
- Salinization (2)
- Threshold (2)
- Versalzung (2)
- XANES (2)
- Zink (2)
- Abbildungsverfahren (1)
- Ablation (1)
- Abrasive belt (1)
- Absorption spectrometry (1)
- Agar (1)
- Amonium polyphosphate (1)
- Anion exchange (1)
- Artificial defect (1)
- Atmospheric corrosion (1)
- Atmospheric exposure (1)
- Austenitic Stainless Steel (1)
- Austenitic stainless steel (1)
- BDS broadband dielectric spectroscopy (1)
- Beta-relaxation (1)
- Beton (1)
- Bewehrung (1)
- Bildgebende Darstellung (1)
- Broadband Dielectric Spectroscopy (1)
- Broadband Dielectric Spectrscopy (1)
- Brücke (1)
- CHOCLAB (1)
- Calcium monofluoride (1)
- Carbon dioxide (1)
- Cathodic protection (1)
- Cavitation (1)
- Color X-ray camera (1)
- Combustibility of liquids (1)
- Compaction faults (1)
- Compound refractive lens (1)
- Corrosion resistance (1)
- Corrosivity category (1)
- Covalent Organic frameworks (1)
- Crystal Texture (1)
- Cutlery (1)
- DL-EPR (1)
- Damage (1)
- Deckschichten (1)
- Dielectric measurements (1)
- Dielectric relaxation spectroscopy (1)
- Diesel Fuel (1)
- Diffusion (1)
- Digitale Radiographie (1)
- Distribution of nanoparticles (1)
- Drop Evaporation Test (1)
- Dust explosions (1)
- EDM (1)
- EPR-Test (1)
- Electric discharge machining (1)
- Electrochemical noise (1)
- Exothermic and pressure-inducing chemical reactions (1)
- Expandable graphite (1)
- Explosive condensed substances (1)
- FT-IR (1)
- Fast Scanning Calorimetry (1)
- Fast scanning calormetry (1)
- Femtosecond (1)
- Femtosecond laser ablation (1)
- Femtosekunden (1)
- Filled rubbers (1)
- Filled thermosets and plastics (1)
- Firework display (1)
- Flammable gases and vapors (1)
- GMR (1)
- GMR-Sensor (1)
- Gas separation membrane (1)
- Gel electrolytes (1)
- Gelartige Elektolyte (1)
- Glass (1)
- Gold nanoparticles (1)
- Graphite furnace (1)
- Growth mechanism (1)
- HR-CS-MAS (1)
- Hagen (1)
- Hard coatings (1)
- Harmful effects of substances (1)
- Highly permeably polynorbornenes (1)
- Hot Cracking (1)
- ISO 11254-2 (1)
- ISO 9223 (1)
- Impact-echo (1)
- Impakt-Echo (1)
- Inelastic neutron scattering (1)
- Interfacial polarisation (1)
- Internal Surfaces (1)
- Korrosionsbeständigkeit (1)
- Korrosionsschnelltest (1)
- Korrosionsuntersuchungen (1)
- Kurzpulslaser (1)
- Laser (1)
- Laser Welding (1)
- Laser safety (1)
- Lasersicherheit (1)
- Lasertechnik (1)
- Liquid chromatography (1)
- Low-frequency impedance spectroscopy (1)
- Luftultraschall (1)
- Magnetic flux leakage (1)
- Mass loss (1)
- Materialbearbeitung (1)
- Materials processing (1)
- Matrimid (1)
- Membrane (1)
- Membrane polymers (1)
- Metallic coatings (1)
- Methane removal (1)
- Methane total oxidation (1)
- Methyl group rotation (1)
- Microporous polymers (1)
- Mobiles Röntgen (1)
- Multiple-pulse damage (1)
- NDT (1)
- NDT of Wood (1)
- Nano structure (1)
- Nanocomposite (1)
- Nanodielectrics (1)
- Nanoparticle formation (1)
- Ni-Base Alloy (1)
- Nondestructive (1)
- Normung (1)
- Oberfläche (1)
- Oberflächenbehandlung (1)
- Ochratoxin A (1)
- PE-HD Sorption (1)
- Particles (1)
- Passivität (1)
- Permeation (1)
- Physical ageing (1)
- Physical aging (1)
- Polarisation (1)
- Polycapillary optic (1)
- Polyhedral oligomeric silsesquioxanes (1)
- Polymer (1)
- Polymer clay nanocomposites (1)
- Polymer of intrisic microporosity (1)
- Polymerbasierte Nanokomposite (1)
- Polymers (1)
- Polynorbornes (1)
- Polystyrene (1)
- Prüfmethoden (1)
- Rapid corrosion test (1)
- Reaction products (1)
- Reconstruction (1)
- Reference defect (1)
- Round-robin experiment (1)
- S on 1-LIDT (1)
- SAFT (1)
- SIP (1)
- Scannende Systeme (1)
- Schleifen (1)
- Schneidwaren (1)
- Separation membranes (1)
- Silicon impurities (1)
- Small-angle X-ray scattering (1)
- Solar cell (1)
- Solid-phase extraction (1)
- Sound pressure (1)
- Spannglied (1)
- Spectral induced polarization (1)
- Spektroskopie (1)
- Stress corrosion Cracking (1)
- Streuflussprüfung (1)
- Surface (1)
- Surface treatment (1)
- Synchrotron radiation (1)
- Synergy (1)
- Synthetic aperture focusing technique (SAFT) (1)
- Tandem mass spectrometry (1)
- Testing methods (1)
- Textile (1)
- Thermoplastic elastomers (1)
- TiMgN (1)
- Ultraschallecho-Verfahren (1)
- Ultrasonic echo (1)
- Verfleckungen (1)
- WAXS (1)
- Wine (1)
- X-ray fluorescence (1)
- X-ray micro beam (1)
- X-ray photoelectron spectroscopy (1)
- X-ray refraction (1)
- Xerogel (1)
- ZfP (1)
- Zirconium (1)
- corrosion invetsigations (1)
- gel-type electrolytes (1)
- pnCCD (1)
- zinc coatings (1)
- Überzüge (1)
Organisationseinheit der BAM
- 7 Bauwerkssicherheit (30)
- 6 Materialchemie (21)
- 6.6 Physik und chemische Analytik der Polymere (18)
- 7.5 Technische Eigenschaften von Polymerwerkstoffen (18)
- 7.6 Korrosion und Korrosionsschutz (12)
- 6.5 Synthese und Streuverfahren nanostrukturierter Materialien (6)
- 6.1 Oberflächen- und Dünnschichtanalyse (3)
- 1 Analytische Chemie; Referenzmaterialien (1)
- 1.1 Anorganische Spurenanalytik (1)
- 1.4 Prozessanalytik (1)
Eingeladener Vortrag
- nein (1)
Dielectric Study of Molecular Mobility in Poly(propylene-graft-maleic anhydride)/Clay Nanocomposites
(2005)
Polymer/clay nanocomposite materials based on poly(propylene-graft-maleic anhydride) (PPgMAH) and two different organophilic modified clays were investigated by dielectric relaxation spectroscopy (DRS). In contrast to ungrafted polypropylene (PP), PPgMAH shows a dielectrically active relaxation process which can be assigned to localized fluctuations of the polar maleic anhydride groups. Its relaxation rate exhibits an unusual temperature dependence, which could be attributed to a redistribution of water molecules in the polymeric matrix. This is confirmed by a combination of Raman spectroscopy and thermogravimetric experiments (TGA) with real-time dielectric measurements under controlled atmospheres. In the nanocomposites this relaxation process is shifted to higher frequencies up to 3 orders of magnitude compared to the unfilled polymer. This indicates a significantly enhanced molecular mobility in the interfacial regions. In the nanocomposite materials a separate high-temperature process due to Maxwell-Wagner-Sillars (MWS) polarization was observed. The time constant of this MWS process can be correlated with characteristic length scales in nanocomposites and therefore provides additional information on dispersion and delamination/exfoliation of clay platelets in these materials. These properties also influence the diffusivity of the water molecules as revealed by real-time dielectric investigations.
Zusammenfassung
Die Anwendung des Ultraschallecho-Verfahrens zur Hohlstellenortung in Holzbalken wird beschrieben.
An Hand der Versuchsergebnisse wird der Einfluss der Anisotropie des Holzes auf die Messkopfanordnung und Schallgeschwindigkeit dargestellt. Mit der optimierten Messanordnung ist die erfolgreiche Detektierung von Nachbildungen von Minderdicken und Kernfäule möglich. Besonders klar sind Schäden in Faserrichtung (Kernfäulenachbildung) nachzuweisen. Die sehr guten Ergebnisse zeigen die Anwendbarkeit des Ultraschallecho-Verfahrens an Holz.
Femtosecond laser pulses are close to industrial use. The advantages of ultrashort laser pulses for micromachining applications especially in the case of dielectric and biological samples down to pulse durations of 5 fs have been established. The current international standards of laser safety are primarily concerned with CW and pulsed lasers down to the nanosecond range. Therefore, human tissue and laser-protection equipment was investigated with respect to its resistance and protection performance for femtosecond laser illumination down to 30 fs. This included filter glasses for laser protection eyewear, polymer and textile materials used in curtains and guards. Bulk absorber filters can provide enough protection against laser radiation, give a sufficiently broad absorption spectrum. Materials are damaged more easily by femtosecond laser radiation. The need for sufficient spectral broadness as well as the different damage thresholds have to be included in international laser safety standards. This work should trigger the development of novel eye-protection devices that are lighter and ergonomically more acceptable than present commercial models.
Hot cracks as stress corrosion cracking initiation sites in laser welded corrosion resistant alloys
(2005)
Although hot cracks at weld surfaces of corrosion resistant alloys (CRAs) might provide access to respective aggressive media and thus, might provide the conditions for a local potential and pH drop, the interaction between hot cracking and corrosion phenomena has not been investigated up to the present. This particularly concerns the initiation of stress corrosion cracking inside such crevices.
As a first approach to clarify the influence of hot cracks on corrosion resistance, considering particularly stress corrosion cracking, hot crack afflicted laser welds of three different CRAs have been subjected to a series of different corrosion tests.
Besides the fact that the Drop Evaporation (DE) Test represents a more realistic procedure than standard immersion tests it turned out that hot cracks can obviously represent an initiation site of stress corrosion cracking in the austenitic stainless steel AISI 309 (German No. 1.4828). The susceptibility of such hot crack afflicted laser welds to stress corrosion cracking (SCC) significantly depends on temperature and chloride concentration of the test environment In comparison, the high nitrogen austenitic stainless steel AISI S 34565 (German No. 1.4565) did not exhibit any stress corrosion cracking associated with hot cracking. This material exhibited pitting corrosion and stress corrosion only in the base material. The Alloy 50 (German No. 2.4850), a Nickel based material, was susceptible to pitting corrosion, but showed no tendency towards stress corrosion cracking at all.