Influence of the Characteristics of Spinels on the Slag
Abstract. The XRD patterns at ambient temperature and at 1500°C showed that the spinel in the Al 2 O 3 –MgO castables fired at 1500°C for 3 h has the higher peak intensity compared to those in Al 2 O 3 –spinel castables the interplanar distance in the set (311) is 2.43 Å for the spinel in Al 2 O 3 –MgO castables as well as the spinels in Al 2 O 3 –spinel castables using spinels
Chat OnlineHigh‐Temperature Behavior of the Aluminum Oxycarbide
A large number of high‐temperature experiments involving binary mixtures of alumina and aluminum carbide (Al 4 C 3) were performed to clarify the behavior of the aluminum oxycarbide Al 2 OC. It is first shown from heat treatments on the molar composition 55Al 2 O 3 ·45 Al 4 C 3 that in conditions of stable equilibrium Al 2 OC decomposes to Al 4 O 4 C and Al 4 C 3 at 1715°C according to
Chat OnlineInfluence of the Characteristics of Spinels on the Slag
Abstract. The XRD patterns at ambient temperature and at 1500°C showed that the spinel in the Al 2 O 3 –MgO castables fired at 1500°C for 3 h has the higher peak intensity compared to those in Al 2 O 3 –spinel castables the interplanar distance in the set (311) is 2.43 Å for the spinel in Al 2 O 3 –MgO castables as well as the spinels in Al 2 O 3 –spinel castables using spinels
Chat OnlineInteraction of the oxyfluoride melts of Ca Al Mg Si Ba
The interaction of slags consisting of the oxides and fluorides of Ca Al Mg Si Ba and Cr with refractories based on Al2O3 MgO and MgO · Al2O3 is experimentally studied at 1600–1700°C
Chat OnlineEffect of CaO/Al2O3 Ratio of Ladle Slag on Formation
Department of Materials Engineering Hanyang University Ansan Korea. (Received on August 8 2017 accepted on September 13 2017) The effect of CaO/Al 2O 3 (=C/A) ratio of the ladle slag on the formation behavior of non-metallic inclu-sions in the Mn-V-alloyed steel was investigated using both the experimental method and refractory-slag-
Chat OnlineThe effect of mechanochemically activated MgO in Al2O3
Jun 01 2016 · Al 2 O 3–MgO–C is increasingly being used in refractories for secondary steelmaking especially for ladle applications due to their particular combination of resistance to slag corrosion high thermal shock resistance and excellent hot strength.
Chat OnlineReview on the elaboration and characterization of ceramics
The porous MgO-Al2O3 refractory containing 30-92wt. Al2O3 were prepared via an in situ decomposition pore-forming route using magnesite and Al(OH)3. The results showed that the Al2O3 contents in the porous refractory aggregates strongly affected the spinel formation change of the neck bonds between the particles pore structure and then
Chat OnlineFormation of dense non-oxide layer in Al–TiO2–MgO–Al2O3
Oct 15 2019 · The dense layer structure in a refractory can enhance its high-temperature service performances. In order to obtain such a structure the formation diffusion and deposition processes of Mg (g) were designed in resin-bonded Al–TiO 2 –MgO–Al 2 O 3 refractory at high temperatures in flowing nitrogen. The AlN–Al 2 O 3 –MgO ternary system was constructed to obtain the dense layer
Chat OnlineIssue No. 1Techna Group
Abstract. The main target of this work is to prepare refractory magnesia- and alumina- based ceramics within the MgO-Al2O3-ZrO2-SiO2 system. These include periclase (MgO) and its composites with MgAl2O4-spinel and forsterite (MgSiO4)-zirconia (ZrO2) as well as corundum (α-Al2O3) and its composite with mullite (Al6Si2O13)-zirconia (ZrO2).
Chat OnlineEffect of CaO/Al2O3 Ratio of Ladle Slag on Formation
Department of Materials Engineering Hanyang University Ansan Korea. (Received on August 8 2017 accepted on September 13 2017) The effect of CaO/Al 2O 3 (=C/A) ratio of the ladle slag on the formation behavior of non-metallic inclu-sions in the Mn-V-alloyed steel was investigated using both the experimental method and refractory-slag-
Chat OnlinePreparation and slag erosion resistance mechanism of
Nov 01 2020 · 1. Introduction. Refractory materials refer to a class of inorganic non-metallic materials whose refractoriness is not less than 1853 K .Refractory materials are widely used in the metallurgical chemical and other industrial fields with the former accounting for the largest proportion i.e. 60 of the total consumption 4 5 recent years with the rapid growth in China s steel
Chat OnlineInfluence of Residual Stresses on the Wear Behavior of
Dec 20 2004 · Changxia Liu Junlong Sun Gang Li Bin Li Feng Gong Fabrication mechanical properties and fracture behaviors of the laminated Al2O3–ZrB2–MgO / Al2O3–TiN–MgO ceramic composite Ceramics International 10.1016/j.ceramint.2019.09.043 (2019).
Chat OnlinePatents Assigned to Shinagawa Refractories Co. Ltd
Sep 27 2004 · Abstract A subject for the invention is to provide an unshaped refractory composition having not only high thermal resistance but also improved corrosion resistance and improved unsusceptibility to slag infiltration. The invention is "an unshaped refractory composition comprising (1) 20 to 70 by weight raw spinel material comprising an MgO—Al2O3 spinel phase and containing 2
Chat OnlineReaction-sintered AluminaSpinel Composites Effect of
Some of the refractory varieties are fireclays chromite magnesite high alumina chromites silicon carbide refractory etc. Spinel as a ceramic and refractory material Introduction Magnesium aluminate spinel (MgO.Al 2 O 3) Fig.3 is the parent member of chemical compound group with the common notation AB 2 X 4
Chat OnlineCleanliness of Low Carbon Aluminum‐Killed Steels during
Yang Sun Yong Li Lixin Zhang Ling Li Jialin Sun Effect of TiO2 on the formation of novel non-oxide phases in Al-MgO-Al2O3 composite at high temperatures in flowing N2 Materials Chemistry and Physics 10.1016/j.matchemphys.2020.123963 (123963) (2020).
Chat OnlineMaterials Free Full-Text Thermodynamic Properties
The effect of TiO2 and the MgO/Al2O3 ratio on the viscosity heat capacity and enthalpy change of CaO–SiO2–Al2O3–MgO–TiO2 slag at constant heat input was studied. The variation of slag structure was analyzed by the calculation of activation energy and FTIR spectrum measurements. The results showed that the heat capacity and enthalpy change of the slag decreased with the increase of
Chat OnlineAnalysis and Prediction of Corrosion of Refractory
Oct 23 2020 · 2. Thermodynamic Calculations. Thermodynamic simulation is based on the version 7.2 of FactSage TM software for thermodynamic equilibrium calculations. In this paper the components of refractory materials such as MgO·Cr 2 O 3 MgO·Al 2 O 3 Al 2 O 3 MgO and Cr 2 O 3 are selected as research objects. The corrosion mechanism of Na 2 CO 3 Na 2 SO 4 and NaCl on refractory materials
Chat OnlineInfluence of the Characteristics of Spinels on the Slag
Abstract. The XRD patterns at ambient temperature and at 1500°C showed that the spinel in the Al 2 O 3 –MgO castables fired at 1500°C for 3 h has the higher peak intensity compared to those in Al 2 O 3 –spinel castables the interplanar distance in the set (311) is 2.43 Å for the spinel in Al 2 O 3 –MgO castables as well as the spinels in Al 2 O 3 –spinel castables using spinels
Chat OnlineAbstractsUNITECR 2017
o55) high-performance refractory ceramics from waste materials . 54 o56) a review on recycling of refractories for the iron steel industry.. 54 o57) application of recycled refractory materials to
Chat OnlinePatents Assigned to Shinagawa Refractories Co. Ltd
Sep 27 2004 · Abstract A subject for the invention is to provide an unshaped refractory composition having not only high thermal resistance but also improved corrosion resistance and improved unsusceptibility to slag infiltration. The invention is "an unshaped refractory composition comprising (1) 20 to 70 by weight raw spinel material comprising an MgO—Al2O3 spinel phase and containing 2
Chat OnlineCoherent Precipitation in the System MgO‐Al2O3‐Cr2O3
An isothermal section of the ternary system MgO–Al 2 O 3 ‐Cr 2 O 3 was determined at 1700°± 15°C to delineate the stability field for spinel crystalline solutions (cs). Crystalline solutions were found between the pseudobinary joins MgAl 2 O 4 –Cr 2 O 3 and MgCr 2 O 4 ‐Al 2 O 3 and the binary join MgAl 2 O 4 ‐MgO. The first two crystalline solutions exhibit cation vacancy models
Chat OnlineInvestigation on Al-Al2O3-MgO·Al2O3 Composites Refractory
The unfired Al-Al2O3-MgO﹒Al2O3 bricks were prepared with white fused corundum fused spinel power and metallic aluminum powder. Effects of metallic aluminum powder content (mass =0 2 4 6 8 respectively) on normal temperature physical properties and microstructure were investigated. The result revealed that by adding aluminum powder the sample showed the characteristics of "plastic
Chat OnlinePreparation and characterization of porous MgO–Al2O3
Jan 01 2015 · The porous MgO–Al 2 O 3 refractory aggregates containing 30–92 wt Al 2 O 3 were prepared via an in-situ decomposition pore-forming route using magnesite and Al(OH) 3 as starting raw materials. The phase compositions pore characteristics and mechanical strengths were characterised by means of X-ray diffractometry (XRD) scanning electron microscopy (SEM) and mercury porosimetry
Chat Online(PDF) Microstructural evolution in MgOp/AlN composites
Many composites have been fabricated by infiltration are unsuitable for multiple heat operations because magnesia– and nitridation of Al Al–Mg or Al–Mg–Si alloys into Al2O3 or graphite slide gates have poor spalling resistance due to the SiC reinforcement materials 4–7 . MgO composite reinforced large thermal expansion coefficient
Chat OnlineCorrosion Behavior of Al2O3‐C Refractories with Casting
May 19 2015 · The degradation behavior of alumina (10–20 wt ) carbon refractories was investigated during high temperature (1 550 °C) contact with a ternary casting mould meniscus slag containing 50 MnO 25 SiO 2 and 25 Al 2 O 3 and a binary slag containing 40 MnO and 60 SiO 2.Using the sessile drop approach the transient progress of corrosion reactions was investigated as a function of
Chat OnlineIssue No. 1Techna Group
Abstract. The main target of this work is to prepare refractory magnesia- and alumina- based ceramics within the MgO-Al2O3-ZrO2-SiO2 system. These include periclase (MgO) and its composites with MgAl2O4-spinel and forsterite (MgSiO4)-zirconia (ZrO2) as well as corundum (α-Al2O3) and its composite with mullite (Al6Si2O13)-zirconia (ZrO2).
Chat Online(PDF) Thermal evolution of Al2O3-MgO-C refractories
Abstract and Figures In spite of the high cost of bauxite Al2O3-MgO-C refractory bricks (AMC) are widely used for steelmaking vessel working linings due to their excellent properties high
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