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A spinel forming castable with an initial MgO content of 8%, commonly applied in refractory linings in the steel industry, was characterised with regard to the creep behaviour. Three creep stages were observed for 1300, 1400, and 1500 °C for application relevant loads between 3 and 8 MPa for sintered samples.
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The modulus of rupture and creep behaviour of refractory castables at high temperature (1000–1400 °C) with additions of spinel, periclase and dolomite has been studied. Three processing routes for obtaining refractory concretes within the alumina-rich zone of the Al 2 O 3 –MgO–CaO ternary system were employed. To achieve high temperature mechanical …
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DOI: 10.1016/j.ceramint.2021.10.103 Corpus ID: 239602642; Investigation of three-stage compressive creep of a spinel forming refractory castable containing 8% MgO @article{Akbari2021InvestigationOT, title={Investigation of three-stage compressive creep of a spinel forming refractory castable containing 8% MgO}, author={Behnam Akbari and Dietmar …
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Generally, the creep behavior of materials can be split in three stages. The first stage, called primary creep, presents a time-dependent strain rate which decreases with time. In the secondary creep stage, the strain rate is considered to be constant, and an approximate equilibrium between hardening and softening processes can be assumed [2].
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Creep behaviour of alumina spinel brick at various temperature and stress level is researched for small specimens [15], however, the effect of creep behaviour at large-scale on a masonry is not ...
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Therefore, experimental studies to investigate the creep behavior of alumina spinel at lower temperatures and higher stress levels (up to the ultimate compressive stress of the material) are ...
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A spinel forming castable with an initial MgO content of 8%, commonly applied in refractory linings in the steel industry, was characterised with regard to the creep behaviour.
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Creep behaviour of nearly stoichiometric spinel, (Al2O3)n MgO, n=1.1, is investigated for compression axis [001], at temperatures 0.77 to 0.83 Tm and constant loads 88.2 to 117.6 MPa. Experimental observations, including the mechanical creep law and the dislocation substructures as imaged by TEM and Berg-Barrett X-ray topography support the following picture: {100} …
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The current study investigated the scatter in compressive creep behavior of a shaped alumina spinel containing refractory material. A sampling scheme was considered to examine the effect of specimen's spatial position in a brick on the creep behavior. It showed that the drilling position and direction of specimens in a brick had an evident ...
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The flow law for diffusion creep of chromite spinel has been determined from uniaxial compressive creep experiments at temperatures of 1400° to 1600 °C and a pressure of 0.1 MPa on ...
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Wu and Holmes [7] performed tensile creep and creep strain recovery tests on silicon carbide fiber/calcium aluminosilicate-reinforced ceramic composites.The composites used in their study contained 40 vol% Nicalon fibers. The creep strain recovery ratio (R cr) and total strain recovery ratio (R t) were used to quantify the recovered strain.R cr is defined as the …
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These results are in agreement with patterns of multipolar Cr-Al zoning observed in natural chromite spinel samples deformed by diffusion creep. Diffusion coefficients of Cr and Al in chromite spinel have been determined at pressures ranging from 3 to 7 GPa and temperatures ranging from 1,400 to 1,700°C by using the diffusion couple of natural ...
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Creep behaviour of nearly stoichiometric spinel, (Al2O3)n MgO, n=1.1, is investigated for compression axis [001], at temperatures 0.77 to 0.83 T m and constant loads 88.2 to 117.6 MPa. Experimental observations, including the mechanical creep law and the dislocation substructures as imaged by TEM and Berg-Barrett X-ray topography support the following picture: {100} …
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The model shows good flexibility in fitting the test data of the alumina-spinel refractory over the three creep stages. A temperature and stress dependence model is derived for the theta coefficients, reducing the number of material parameters necessary to describe the material's behaviour. The experimental creep curves are presented, as well ...
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in the dislocation creep regime (e.g., Christiansen 1986; Hwang et al. 1988), multipolar chemical zoning of Cr and Al in elongated spinel grains demonstrates the dominance of diusion creep (Ozawa 1989). Such zoning of Al and Cr within individual spinel grains, which is also known as stress-driven kinetic demixing (Dimos et al. 1988a), contains
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A spark plasma sintering (SPS) apparatus was used for the first time as an analytical testing tool for studying creep in ceramics at elevated temperatures. Compression creep experiments on a fine-grained (250 nm) polycrystalline magnesium aluminate spinel were successfully performed in the 1100-1200 …
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Download scientific diagram | Compressive creep test results at 1300 • C (a), 1400 • C (b), and 1500 • C (c). from publication: Investigation of three-stage compressive creep of a spinel ...
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The flow law for diffusion creep of chromite spinel has been determined from uniaxial compressive creep experiments at temperatures of 1400° to 1600 °C and a pressure of 0.1 MPa on ...
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The creep in granular refractories made from mixtures of corundum and magnesia spinel depends on the phase composition of the refractory, the grain-size composition of the original components, the crystal sizes composing the body, the nature of the bond between grain and binding body and the presence of glassy substance.We did not detect any influence of porosity on creep: the …
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Download scientific diagram | XRD result after sintering at 1600 • C. from publication: Investigation of three-stage compressive creep of a spinel forming refractory castable containing 8% MgO ...
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The modulus of rupture and creep behaviour of refractory castables at high temperature (1000–1400 °C) with additions of spinel, periclase and dolomite has been studied.
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Creep behaviour of nearly stoichiometric spinel, (AI 2 03 )n MgO, n = 1.1, is investigated for compression axis [0 0 1], at temperatures 0.77 to 0.83 Tm and constant loads 88.2 to 117.6 MPa. Experimental observations, including the mechanical creep law and the
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The flow law for diffusion creep of chromite spinel has been determined from uniaxial compressive creep experiments at temperatures of 1400° to 1600 °C and a pressure of 0.1 MPa on polycrystalline samples of Mg(Cr,Al)2O4 with grain sizes of ~ 10 μm and chromium mole fractions, XCr, of 0.25, 0.50, and 0.75. Under our experimental conditions, creep rate is …
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Since refractories have similar creep responses to metals, the theta projection creep model is validated to characterize the compressive creep behaviour of alumina-spinel refractories at ...
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theta projection creep method to represent refractory creep. In the present work, the application of the theta projection creep method is adopted to characterize the compressive creep of alumina-spinel refractories over a range of stresses and constant temperatures levels. The goal is to represent all creep stages and their tran-
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