Cordierite - an overview | ScienceDirect Topics
WEBCordierite granites. The cordierite granites have the greatest crustal affinity, though in some ways their petrogenesis and magmatic evolution is the most problematic. In a general sense, the petrography and geochemistry of these plutons accords with derivation from aluminous metasedimentary protoliths (Chappell and White, 1974). Such a process ...
Mechanism of cordierite formation obtained by high temperature ...
WEBJun 15, 2023 · However, cordierite has a very narrow sintering temperature, so the sintering of high-purity cordierite is challenging [9, 10]. Various procedures, such as adding sintering aids to raw materials and switching to natural minerals and solid waste, have been extensively investigated to reduce the sintering temperature [ [11] , [12] , [13] ].
Comprehensive chemical analyses of natural cordierites: …
WEBDec 1, 2004 · Most of the Na–Be-cordierites with more than 0.1 wt.% BeO have been found in pegmatites (unmetamorphosed and metamorphosed) and in related vein deposits (Grew, 2002, Černý, 2002), whereas the Be-cordierite of Alpe Sponda occurs in a kyanite–paragonite–staurolite schist and is strictly metamorphic with no evidence for the introduction of Be from an external source (Armbruster and ...
Low temperature synthesis of highly pure cordierite materials by …
WEBOct 15, 2020 · Cordierite is known to exist in three forms, α- and β-cordierite that are stable at high- and low-temperature, respectively, and metastable μ-cordierite [28]. The XRD results, confirmed that cordierite formation is a multistage process which is mainly influenced by temperature and time.
Cordierite ceramic membrane preparation using gas solid reaction …
WEBFig. 7 presents the XRD results of the cordierite honeycomb ceramics with different conditions. It is evident that cordierite phase (Mg 2 Al 4 Si 5 O 18, PDF#13–0294) as the main crystalline phase of cordierite porous substrates, while mullite (Al 6 Si 2 O 13, PDF#15–0776) is the minor phase. The patterns of cordierite exhibit typical ...
Low-temperature cordierite ceramics with porous structure for …
WEBMar 1, 2024 · The cordierite phase content is low. The cordierite crystals are of irregular form, mostly 0.1−0.5 μm in size. Firing C–4S cordierite ceramics at 1100 °C provides for the formation of a microporous structure represented by a large amount of plate-like circular-shaped cordierite crystals. Crystals of 0.2–0.3 μm in size are predominant.
Thermal expansivity and Raman spectra of natural cordierite: A ...
WEBNov 1, 2022 · Cordierite is widely found to coexist with garnet-group minerals at high temperatures and below 1 GPa in natural settings, and traditionally adopted in geological thermometers and barometers, such as Fe 2+-Mg-exchange cordierite-garnet thermometer and Na-in-cordierite thermometer.
Structural origin of negative thermal expansion of cordierite …
WEBJul 1, 2019 · Three-phase model including low cordierite (SG Cmcm), high cordierite (indialite, SG P6/mcc), and spinel [(Fe,Mg) 2 SiO 4, SG Fd-3 m] phases is refined for the HT XRD data. Silimanite impurity phase [23] is not detected in the HT XRD patterns. Since the amount of indialite and spinel phases in HT XRD sample are …
Microstructure, thermal expansion, hardness and thermodynamic ...
WEBSep 1, 2021 · Cordierite ceramics [1], whether in the form of monolithic cordierite [2] or materials based on cordierite [3], have achieved outstanding technological importance. As one of the main phases of the magnesia-alumina-silica system, cordierite has values of 2.53 g/cm 3 , 1470 °C, and >10 12 Ω cm for its density, melting temperature, and ...
Fabrication and characterization of porous cordierite ceramics …
WEBOct 15, 2019 · Three forms of cordierite have been discovered: α-cordierite (hexagonal, P6/mcc), β-cordierite (orthorhombic, Cccm) and μ-cordierite (a meta-stable modification) [8]. The α-cordierite, which is also known as indialite, is the most common form found in ceramic bodies, while the other two forms are much less …