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  • 1
    Electronic Resource
    Electronic Resource
    Influence of Strong Fiber/Coating Interfaces on the Mechanical Behavior and Lifetime of Hi-Nicalon/(PyC/SiC)n/SiC Minicomposites (2001)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 84 (2001), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Hi-Nicalon fiber-reinforced silicon carbide matrix minicomposites (Hi-Nicalon/SiC) with nanoscale multilayered (PyC/SiC)n fiber coatings (also referred to as interphases) have been manufactured via pressure pulse chemical vapor infiltration (P-CVI). Fiber/coating interfaces were strengthened by using treated fibers. The microstructures of the interphases as well as the propagation and deflection of cracks in the interfacial region were investigated by SEM and TEM. Interfacial shear stress was estimated using various methods based on either the width of hysteresis loops on unloading–reloading, crack spacing, or fitting of the force–deformation curve using a micromechanics-based model. Tensile behavior at room temperature and lifetime in static fatigue in air at 700°C were related to the interphase/interface characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2001.tb00742.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Hi-Nicalon/SiC Minicomposites with (Pyrocarbon/SiC)n Nanoscale Multilayered Interphases (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: SiC/SiC minicomposites that comprise different pyrocarbon/silicon carbide ((PyC/SiC)n) multilayered interphases and a tow of SiC fibers (Hi-Nicalon) have been prepared via pressure-pulsed chemical vapor infiltration. Pyrocarbon and SiC were deposited from propane and a CH3SiCl3/H2 mixture, respectively. The microstructure of the interphases has been investigated using transmission electron microscopy. The mechanical tensile behavior of the minicomposites at room temperature exhibits the classical features of tough composites, regardless of the characteristics of the (PyC/SiC) sequences. The interfacial shear stress has been determined from the width of hysteresis loops upon unloading/reloading and from the crack-spacing distance at saturation. All the experimental data indicate that the strength of the fiber/interphase interfaces is rather weak (∼50 MPa).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb02105.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Impregnation of 3D Woven Carbon Fibre Preforms by Electrophoretic Deposition of Single and Mix of Non Oxide Ceramic Nanoscale Powders, and Densification of the Composite Material (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 50 (Oct. 2006), p. 91-96 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: 3D woven carbon fibre preforms (~ 2 mm thickness) were impregnated with single ormixture of non oxide ceramic nanoscale powders in ethanolic suspensions using electrophoreticdeposition (EPD). The measurement of the ζ potential of the suspension compared with itsbehaviour in sedimentation permits to conclude about the optimal concentration of surfactantnecessary to get the most stable suspension. The experimental results were in agreement with thetheoretical ones obtained using DLVO (Derjaguin, Landau, Verwey and Overbeek) theory. EPDswere carried out by applying a constant voltage between the 3D carbon fibre preform serving asdeposition electrode and counter electrodes in graphite. The effect of the powder concentrationon the rate and the quality of impregnation was studied. A qualitative model based on theexperimental results and literature was then proposed. Experiments were not only carried out onraw 3D fibrous preforms but also on preforms with interphases. SEM and optical micrographiesof fractured and polished sections of the infiltrated fabrics revealed that a quite high degree ofinfiltration (rates of impregnation estimated between 50 and 70 %) was obtained. At last, thecomposite was densified using spark plasma sintering (SPS)
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.50.91.pdf
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  • 4
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    Geochemistry and grain-size of sediment core PC29A, Quitralco Fjord, Chilean Patagonia (2014)
    PANGAEA
    In:  Supplement to: Bertrand, Sebastien; Hughen, Konrad A; Sepúlveda, Julio; Pantoja, Silvio (2014): Late Holocene covariability of the southern westerlies and sea surface temperature in Northern Chilean Patagonia. Quaternary Science Reviews, 105, 195-208, https://doi.org/10.1016/j.quascirev.2014.09.021
    Details
    Publication Date: 2023-10-14
    Description: The climate of Chilean Patagonia is strongly influenced by the southern westerlies, which control the amount and latitudinal distribution of precipitation in the southern Andes. In austral summer, the Southern Westerly Wind Belt (SWWB) is restricted to the high latitudes. It expands northward in winter, which results in a strong precipitation seasonality between 35 and 45°S. Here, we present a new precipitation seasonality proxy record from Quitralco fjord (46°S), where relatively small latitudinal shifts in the SWWB result in large changes in precipitation seasonality. Our 1400 yr record is based on sedimentological and geochemical data obtained on a sediment core collected in front of a small river that drains the Patagonian Andes, which makes this site particularly sensitive to changes in river discharge. Our results show Fe/Al and Ti/Al values that are low between 600 and 1200 CE, increasing at 1200-1500 CE, and high between 1500 and 1950 CE. The increasing Fe/Al and Ti/Al values reflect a decrease in mean sediment grain-size from 30 to 20 µm, which is interpreted as a decrease in seasonal floods resulting from an equatorward shift of the SWWB. Our results suggest that, compared to present-day conditions, the SWWB was located in a more poleward position before 1200 CE. It gradually shifted towards the equator in 1200-1500 CE, where it remained in a sustained position until 1950 CE. The comparison of our record with published regional sea surface temperature (SST) reconstructions for the late Holocene shows that equatorward shifts in the SWWB are systematically coeval with decreasing SSTs and vice versa, which resembles fluctuations over glacial-interglacial timescales. We argue that the synchronicity between SST and SWWB changes during the last 1400 years represents the response of the SWWB to temperature changes in the Southern Hemisphere.
    Keywords: GC; Gravity corer; PC29A; Quitralco Fjord, Chilean Patagonia
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 5
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    Geochemical, sedimentological and micropaleontological analysis of the 9.2 m long, radiocarbon-dated (last 16.8 kyr) LAR sediment core from Larenas Bay (48°S; Chile) (2021)
    PANGAEA
    Details
    Publication Date: 2023-10-14
    Description: We performed geochemical, sedimentological and micropaleontological analyses on a 9.2 m long radiocarbon-dated sediment core collected from Larenas Bay (48°S; Chile) to reconstruct basin isolation and marine ingression over the last 16.8 kyr. The LAR sediment core was collected with a 5 m long Uwitec piston corer (63 mm diameter) onboard the R/V Gran Campo II on September 12th 2008. Two overlapping ~4.6 m long piston cores (LAR I and LAR II) and a 65 cm long gravity core that preserved the sediment-water interface were retrieved. To investigate modern sediments, the top centimeter of an additional Rumohr gravity core (LAR R2) taken at the same location on January 19th 2020 was used. The piston cores were sampled in 2 cm thick slices which were subsequently freeze-dried. Discrete analyses were performed at a 10 to 20 cm interval. A separate set of 1 cm thick samples was used for density measurements.
    Keywords: Alkenones; Baker-Martínez fjord system; biogenic silica; Bulk organic geochemistry; Calcium Carbonate; Chilean Patagonia; density; Diatoms; Grain Size; Holocene; Late Glacial; magnetic susceptibility; stable carbon isotopes
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 6
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    XRF - geochemistry of sediment core PC29A (2014)
    PANGAEA
    Details
    Publication Date: 2023-10-14
    Keywords: Age; AGE; DEPTH, sediment/rock; GC; Gravity corer; Iron; PC29A; Quitralco Fjord, Chilean Patagonia; Titanium; X-ray fluorescence core scanner (XRF)
    Type: Dataset
    Format: text/tab-separated-values, 6174 data points
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  • 7
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    Geochemical, sedimentological and micropaleontological data of the LAR sediment core (2021)
    PANGAEA
    Details
    Publication Date: 2023-10-14
    Description: Bulk organic geochemistry, stable carbon isotopes, biogenic opal, calcium carbonate, geometric mean grain size, C37 alkenones, and freshwater vs. marine diatoms analyzed at a 10 to 20 cm interval.
    Keywords: AGE; Alkenone, C37; Alkenones; Baker-Martínez fjord system; biogenic silica; Bulk organic geochemistry; Calcium carbonate; Calcium Carbonate; Calculated; Calendar age; Carbon, organic, total; Chilean Patagonia; COMPCORE; Composite Core; density; Depth, composite; Diatoms; Diatoms, freshwater; Diatoms, marine; Grain Size; Grain size, mean; Holocene; LAR; LAR_GC_PC; Larenas Bay, Baker-Martínez fjord system, Chile; Late Glacial; Lithogenic material; magnetic susceptibility; Opal, biogenic silica; Sample ID; stable carbon isotopes; δ13C
    Type: Dataset
    Format: text/tab-separated-values, 1023 data points
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  • 8
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    Table 1. Radiocarbon ages obtained on sediment core PC29A (2014)
    PANGAEA
    Details
    Publication Date: 2023-10-14
    Keywords: Age, dated; Age, dated material; Age, dated standard deviation; Age, lower confidence level; Age, upper confidence level; DEPTH, sediment/rock; GC; Gravity corer; PC29A; Quitralco Fjord, Chilean Patagonia; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 42 data points
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  • 9
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    Magnetic susceptibility of the LAR sediment core (2021)
    PANGAEA
    Details
    Publication Date: 2023-10-14
    Description: Continuous high-resolution logging of magnetic susceptibility was accomplished using a Bartington MS2E spot sensor integrated into an automatic logging system. Measurements were performed on the split cores in steps of 1 mm with drift correction every 10 mm using readings in air. The gravity and piston cores were correlated using the magnetic susceptibility data, resulting in a composite core length of 9.20 m.
    Keywords: Alkenones; Baker-Martínez fjord system; Bartington MS2E point sensor; biogenic silica; Bulk organic geochemistry; Calcium Carbonate; Chilean Patagonia; COMPCORE; Composite Core; density; Depth, composite; Diatoms; Grain Size; Holocene; LAR; LAR_GC_PC; Larenas Bay, Baker-Martínez fjord system, Chile; Late Glacial; magnetic susceptibility; Magnetic susceptibility, volume; stable carbon isotopes
    Type: Dataset
    Format: text/tab-separated-values, 17862 data points
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  • 10
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    Density data of the LAR sediment core (2021)
    PANGAEA
    Details
    Publication Date: 2023-10-14
    Description: Wet and dry bulk density were measured on 1 cm thick slices (2.9 ± 0.7 cm3) every 20 cm.
    Keywords: Alkenones; Baker-Martínez fjord system; biogenic silica; Bulk organic geochemistry; Calcium Carbonate; Chilean Patagonia; COMPCORE; Composite Core; density; Density, dry bulk; Density, wet bulk; Depth, composite; Diatoms; Grain Size; Holocene; LAR; LAR_GC_PC; Larenas Bay, Baker-Martínez fjord system, Chile; Late Glacial; magnetic susceptibility; Measured; Sample ID; stable carbon isotopes
    Type: Dataset
    Format: text/tab-separated-values, 187 data points
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    DATA PANGAEA
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