Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 43 for “"Cordierite"”.
-
An investigation of low expansion cordierite-zirconia bodies
… was to undertake a systematic study of cordierite compositions to determine to what extent the ultimate refractoriness and use temperature could be increased by the addition of zirconia without increasing the thermal expansion above 4.0 x 10⁻⁶ cm./cm./°c. A procedure has been presented …
-
Adhesion Strength of Cordierite Bulk Coatings on Molybdenum Substrates
Cordierite was adhered to molybdenum using various metallic interlayers of copper, nickel, and chromium. The development of a coating adhesion test methodology was required to choose between interface designs. An indentation method was chosen because of ease in testing and availability of fracture …
-
Effects of crack-crystallite interaction on the fracture behavior of a cordierite glass-ceramic
… were studied in a model brittle composite, a cordierite glass-ceramic. Microstructural effects associated with the repropagation of the introduced flaws under the imposition of a mechanical load were also examined. Two general types of crystallized microstructures were investigated for samples …
-
High temperature crystal chemistry of hydrous Mg- and Fe-rich cordierites
… been completed using data recorded for a Mg-rich cordierite at 24°C, 375°C, 775°C and 24°C (after heating to 775°C) and for an Fe-rich cordierite at 24°C and 375°C. The mean T-0 bond lengths in both cordierites remain unchanged but the mean octahedral bonds (M-0) lengthen upon heating. The …
-
Cordierite and its retrograde breakdown products as monitors of fluid-rock interaction during retrograde path metamorphism : case studies in the Schwarzwald and the Bayerische Wald (Variscan belt, Germany)
Retrograde breakdown products of cordierite are commonly termed pinite, but their modes, compositions and formation conditions are only poorly known. A systematic study on pinitised cordierite from high-temperature metamorphic pelites of the Schwarzwald and the Bayerische Wald using electron …
-
Structural and petrologic aspects of the emplacement of granitoid plutons : case studies from the western margin of the Joshua Flat-Beer Creek-Pluton (White-Inyo Mountains, California) and the Flasergranitoid zone (Odenwald, Germany)
… distance from the pluton: the andalusite-cordierite, sillimanite, and cordierite-K-feldspar zones, respectively. The Na-in-cordierite thermometer gave c. 730 °C as the peak metamorphic temperature in the innermost aureole. Relative low contents of volatiles in cordierite from pelites …
-
Plasma spraying low thermal expansion alumino-silicate glasses
<p>"Near-stoichiometric cordierite (2MgO-2Al<sub>2</sub>O<sub>3</sub>-5SiO<sub>2</sub>) glasses doped with 6.3, 8.3 and 10.1 weight percent TiO<sub>2</sub> were plasma sprayed onto SiO<sub>2</sub>-based refractory concrete substrates. Substrate temperatures were controlled such that the maximum …
-
Eo-Variscan Orogenesis in the Guilleries Massif, Catalan Coastal Ranges, Northeastern Spain Recorded by U-Th-Pb ages of Monazite Inclusions in Metamorphic Garnet
… Osor formation are characterized by andalusite + cordierite and biotite + garnet + sillimanite assemblages. In garnet porphyroblasts, folded S1 inclusion trails with monazite are truncated by the regionally dominant S2 cleavage. Andalusite + cordierite grade rocks and S2 are syntectonic with the …
-
INTO THE STRUCTURE OF THE PERMIAN DEEP CONTINENTAL CRUST: A MULTISCALE APPROACH TO RECONSTRUCT MIGMATIZATION IN THE VALPELLINE SERIES (DENT BLANCHE TECTONIC SYSTEM, WESTERN ITALIAN ALPS)
… different mineral assemblages (i.e., garnet-, cordierite- and orthopyroxene-bearing), amphibolite and marble, intruded by aplite and pegmatite. Melt production in metapelite and locally in amphibolite occurred during the development of the regional foliation. Quantitative microstructural and …
-
High temperature alkali corrosion kinetics of low expansion ceramics
… carbide, silicon nitride, alumina, mullite, cordierite, transformation toughened zirconia, and aluminum titanate were systematically investigated from 950°C to 1100°C in dry air containing 1.0 +/- 0.1 vol% alkali. The linear reaction rates observed at all temperatures indicate that the alkali …
-
Durability testing of ceramic candle filters in pressurized-fluidized bed combustion environments
… and one with a minimal amount of clay binder, a cordierite filter, a mullite candle filter and an aluminosilicate refractory concrete filter. Exposure testing conditions included a range of temperature from 700-850°C and a pressure ranging from 1.7-1.8 MPa. The HTHP tests included exposing the …
-
Archean metamorphism in northwestern Ontario and southeastern Manitoba
… biotite, biotite-garnet, and biotite-garnet-cordierite paragneisses (Fig. 3). Garnet cordierite geobarometry yielded pressures of 3.8-6.S kb. The metamorphic temperatures increased slightly for the four lithologies: biotite gneisses (<610-650°C), biotite-garnet gneisses (610-670°C), and …
-
A study of mechanochemical activation in solid-state synthesis of advanced ceramic composites
… specific intermediate phases such as MAS (or μ-cordierite) and the effect of intense mechanical action on phase compositions after sintering were well recognized. Later, experiments were performed at 1300 °C, using the selected milling method from earlier tests, wherein Yttria-stabilised …
-
A comparative study of metamorphosed supracrustal rocks from the western Namaqualand metamorphic complex
… metabasites, metacarbonate rocks, magnesium-rich cordierite rocks and iron formations. Further subdivision, based on variations in mineral constituents within each group, also occurred, as well as the presence of lithologies with compositions transitional between certain groups. The various …
-
Fluid inclusions: evidence for a counterclockwise P-T trajectory in the Central Maine terrane of South-Central Massachusetts
… pseudomorphs after early andalusite, abundant cordierite in pelitic lithologies, late replacement of low-P cordierite-bearing assemblages by high-P garnet-bearing assemblages, recrystallization of mylonites associated with late shear zones to form lower-T and higher-P assemblages, and …
-
Densification Behavior of Ceramic and Crystallizable Glass Materials Constrained on a Rigid Substrate
… The densification behavior of zinc oxide and cordierite-base crystallizable glass constrained on a rigid substrate was studied to add to the understanding of the behavior of various materials undergoing sintering when subjected to external substrate constraint. Porous ZnO films were …
-
A phenomenological treatment of thermal expansion in crystals of the lower symmetry classes and the crystal structures of CaCoSi₂O₆ and CaNiSi₂O₆
… have been computed for indialite (hexagonal cordierite), emerald and beryl and for the clinopyroxenes: diopside, hedenbergite, jadeite, ureyite, acmite, and spodumene. The extended Grüneisen equation has been used to further examine the nature of the thermal expansion in emerald, beryl, and …
-
Variable water pressure metamorphic assemblages in the Meguma Group, Nova Scotia
… divariant continuous reactions and contain cordierite only where P<sub>H₂O</sub> < P<sub>Total</sub>. Thus the large number of phases is neither the result of disequilibrium nor representative of a low variance assemblage, but can be described as a divariant assemblage involving 8 to 9 major …
-
Metamorfismo ercinico di bassa-pressione: evoluzione tettonico-metamorfica del complesso di mandatoriccio (massiccio della Sila - Calabria)
… andalusite, staurolite and muscovite, whereas cordierite and fibrolite are less common. U-Pb ages and internal features of zircons suggest that the protoliths of the Mandatoriccio complex formed in a sedimentary basin filled by Cambrian to Silurian magmatic products as well as by siliciclastic …
Page 1 of 3