Magnesium aluminate (MgAl O ) spinel produced via self
spinel was greatly influenced by variation in composition. Similar work by Serry et al. 13 describes the effect of various phase compositions and presence of dopants/impurities on the densification of spinel. Bulk density obtained after firing at 1700°C was 90 on impure batches compared to pure stoichiometric (85–88 ) spinel grains.
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Structure and phase formation of combustion products
Synthesis of aluminum oxynitride (γ-AlON) in conditions of self-propagating high-temperature synthesis (SHS) gas-statting under high pressures (10–100 MPa) of gaseous nitrogen including the mode of so-called coupled combustion reactions (chemical furnaces) is investigated. It is shown that chemical and phase compositions of combustion products as well as their structure and morphology
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(PDF) The effect of nano sized carbon black on the phase
THE EFFECT OF NANOSIZED CARBON BLACK ON THE PHASE EVOLUTION AND RHEOLOGICAL PROPERTIES OF AL2O3- SICSIO2-C CASTABLE 1 2 Mohamad Hassan Amin Mohsen Amin-Ebrahimabadi 1 Materials and Energy Research Centre(MERC) Meshkin-Dasht Road Karaj IRAN 2 Pars Refractories Co. Yazd Iran INTRODUCTION Al2O3-SiC-SiO2 composites have been widely
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THE PROPERTIES OF A LOW CEMENT CASTABLE CONTAINING
in situ spinel alumina castables fabricated by hydrous spinel gel prepared by the cost effective precursors via the rapid coprecipitation technique. The evolved gel phase has been categorically characterized and then added to a low cement castable batch 18-24 in differ-ent concentrations. The properties of such castable
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Effect of SiC on Microstructure Phase Evolution and
Ultra-high temperature ceramic composites have been widely investigated due to their improved sinterability and superior mechanical properties compared to monolithic ceramics. In this work high-entropy boron-carbide ceramic/SiC composites with different SiC content were synthesized from multicomponent carbides HfC Mo2C TaC TiC B4C and SiC in spark plasma sintering (SPS) from
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Effects of rare earth oxides additions on microstructure
Jun 15 2017 · The phase evolution such as spinel and CA 6 formation in cement-bonded spinel-forming castables was more complicated . Thus the non-homogeneous distribution of yttrium and cerium as well as the morphology of CA 6 in alumina-magnesia castables was most likely related to the respective interaction mechanism of Y 2 O 3 and CeO 2.
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Microstructure Control and Performance Evolution of
Jul 23 2019 · Study on the damage evolution of torsional fretting fatigure in a 7075 aluminum alloy. Wear 402–403 160–168 (2018). Article Google Scholar
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The evolution of microstructure during the transformation
Evolution de la microstructure de Mg2Ge04 au cours de la transformation olivine-spinelle . partielles. L. 1. Introduction. The olivine to spinel phase transformation is believed to occur at a depth of 400 km in the Earth s mantle. This transformation is of great importance because of the effect it must have on the dynamics of mantle
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Behaviour of alumina-spinel self-flowing castables with
The microstructure and phase composition of alumina–spinel self-flowing refractory castables added with nano-alumina particles at different temperatures are investigated.
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Ivar E. ReimanisMetallurgical and Materials Engineering
A. Miller I. E. Reimanis and M. Rubat du Merac "Enhanced Fracture Toughness in Non-Stoichiometric Magnesium Aluminate Spinel Through Dissolution of Second Phase Alumina" in press in Journal of the American Ceramic Society (2017).
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Effects of nano-alumina content on the formation of
Dec 15 2017 · The phase composition of the specimens with different of nano-alumina particle contents after firing at 1650 °C are shown in Fig. 1 can be seen that the main phase was α-Al 2 O 3 in all compositions. This result demonstrated that the nano γ-Al 2 O 3 overall transformed into α-Al 2 O 3 at 1650 °C. Additionally the intensities of the main α-Al 2 O 3 peaks increased slightly with
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Preparation Microstructure and Mechanical Properties of
The solid wastes fly ash and aluminum dross were used to prepare the low cost high added-value product spinel-corundum-Sialon with an in situ aluminothermic reduction-nitridation reaction. The effects of varying raw material components and heating temperatures on the phase compositions microstructure bulk density apparent porosity and bending strength of products were investigated.
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A review applications of the phase field method in
Apr 14 2017 · This paper evaluates the role of the phase field method in predicting the microstructure evolution of irradiated nuclear materials and the impact on
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CERAMICS INTERNATIONAL Effects of MgO micropowder on
Development of lightweight refractories has been in high demand and the matrix of these materials is crucial for its slag resistance. This paper focuses on the relationship between the microstructure and the resistance coefficient of the Al 2 O 3
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Microstructure and mechanical properties of aluminium
Sep 06 2018 · Aluminium matrix composite (AMC) has found wide application in the fields of aerospace automobile military transportation and building due to its attractive properties such as light weight corrosion resistance and superior ductility (Bodunrin et al. 2015).Graphene is a very promising reinforcing phase in AMC because of its outstanding properties including high mechanical strength
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PART 2 SESSION IB HIGH TEMPERATURE CHEMISTRY
The Effect of Additives on Microstructural Evolution Effect of Slip Conditions on the Microstructure of Supported alpha-Alumina Layers L.G. Grönroos and T.A. Mäntylä 900 Phase Transformation and Sintering o gamma-Alf 2 O 3-Effects of Powder Characteristics and Dopants (Mg or Y) P. Bowen C. Carry H. Hofmann and C. Legros 904
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The evolution of microstructure during the transformation
Evolution de la microstructure de Mg2Ge04 au cours de la transformation olivine-spinelle . partielles. L. 1. Introduction. The olivine to spinel phase transformation is believed to occur at a depth of 400 km in the Earth s mantle. This transformation is of great importance because of the effect it must have on the dynamics of mantle
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Improvement of Resistance of MgO-Based Refractory to
tion. However the detailed analysis of microstructure and phase evolution by slag penetration has not been addressed sufficiently so far. Despite many advantages of in situ spinel bonding expansion difference between spinel and MgO is con-sidered as one of the most serious drawbacks which hinders the potential applications of this material. To
Get PriceEvolution of an alumina-magnesia/self-forming spinel
Similar ways have been observed for Al 2 O 3-based products in which fine MgO had been used instead of alumina. Thus the evolution of alumina-spinel castables has been achieved by two approaches (a) adding synthetic spinel as an aggregate in an alumina castable and/or (b) including MgO to the binder phase of the castable.
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(PDF) Spinel-Coated Graphite for Carbon Containing
The microstructure of the thin interface between the S refrac- tory and slag (Fig. 5(c)) shows the prolific existence of card-like hibonite crystals firmly interlocked with corundum and spinel grains. Microstructure and phase evolution of alumina–spinel self-flowing refractory castables containing nano-alumina particles.
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Effect of Spinel Kinds on Properties of Alumina—Spinel
The microstructure and phase composition of alumina–spinel self-flowing refractory castables added with nano-alumina particles at different temperatures are investigated.
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Zero-cement high-alumina castables Semantic Scholar
Microstructure and phase evolution of alumina–spinel self-flowing refractory castables containing nano-alumina particles S. Otroj A. Daghighi Materials Science
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Improvement of Resistance of MgO-Based Refractory to
tion. However the detailed analysis of microstructure and phase evolution by slag penetration has not been addressed sufficiently so far. Despite many advantages of in situ spinel bonding expansion difference between spinel and MgO is con-sidered as one of the most serious drawbacks which hinders the potential applications of this material. To
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Effect of gas–solid interface on pore wall microstructure
Feb 26 2021 · In this paper through thermal analysis of the melting process of foamed ceramics the microstructure evolution of foamed ceramics and the effect mechanism of the appearance of gas–solid interface on the evolution of pore wall structure are studied. A new method for regulating the microstructure of pore wall based on gas–solid interface is proposed.
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The influence of in situ spinel formation on
Jan 01 2008 · The microstructural evolution of the matrix was also influenced by the spinel formation from reactive alumina and MgO fine grains. It was also clarified that the spinel stoichiometric was varied from normal type to alumina rich depending upon the firing temperature and atmosphere.
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