Viscoelastic toughening of refractory ceramics

2021 ◽  
Author(s):  
Edem T. Akpan
Keyword(s):  
Refractory Ceramics

Lattice Imaging of Grain Boundaries in Ceramics

1977 ◽  
Vol 35 ◽  
pp. 114-115
Author(s):  
D. R. Clarke ◽  
G. Thomas
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Silicon Nitride ◽  
Grain Boundaries ◽  
High Temperature Strength ◽  
Current Interest ◽  
Lattice Imaging ◽  
Special Significance ◽  
Structural Applications ◽  
Refractory Ceramics

Grain boundaries have long held a special significance to ceramicists. In part, this has been because it has been impossible until now to actually observe the boundaries themselves. Just as important, however, is the fact that the grain boundaries and their environs have a determing influence on both the mechanisms by which powder compaction occurs during fabrication, and on the overall mechanical properties of the material. One area where the grain boundary plays a particularly important role is in the high temperature strength of hot-pressed ceramics. This is a subject of current interest as extensive efforts are being made to develop ceramics, such as silicon nitride alloys, for high temperature structural applications. In this presentation we describe how the techniques of lattice fringe imaging have made it possible to study the grain boundaries in a number of refractory ceramics, and illustrate some of the findings.

High-refractory ceramics based on alumina-yttria binders

2015 ◽  
Vol 51 (7) ◽  
pp. 722-727 ◽  
Author(s):  
M. S. Varfolomeev ◽  
V. S. Moiseev ◽  
G. I. Shcherbakova ◽  
N. S. Krivtsova ◽  
G. Yu. Yurkov
Keyword(s):  
Refractory Ceramics

Influence of Fly Ash on Corrosion Resistance of Refractory Forsterite-Spinel Ceramics

2021 ◽  
Vol 325 ◽  
pp. 181-187
Author(s):  
Martin Nguyen ◽  
Radomír Sokolář
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Corrosion Resistance ◽  
Fly Ash ◽  
Raw Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transition Zones ◽  
Refractory Ceramics ◽  
Scanning Electron

This article examines the influence of fly ash on corrosion resistance of refractory forsterite-spinel ceramics by molten iron as a corrosive medium. Fly ash in comparison with alumina were used as raw materials and sources of aluminium oxide for synthesis of forsterite-spinel refractory ceramics. Raw materials were milled, mixed in different ratios into two sets of mixtures and sintered at 1550°C for 2 hours. Samples were characterized by X-ray diffraction analysis and thermal dilatometric analysis. Crucibles were then made from the fired ceramic mixtures and fired together with iron at its melting point of 1535°C for 5 hours. The corrosion resistance was evaluated by scanning electron microscopy on the transition zones between iron and ceramics. Mixtures with increased amount of spinel had higher corrosion resistance and mixtures with fly ash were comparable to mixtures with alumina in terms of corrosion resistance and refractory properties.

scholarly journals Recycling of Secondary Aluminium Production Waste in Processing of Mullite Based Refractory Ceramics

2015 ◽  
Vol 127 (4) ◽  
pp. 1035-1037 ◽  
Author(s):  
D. Kirsever ◽  
N.K. Karabulut ◽  
N. Toplan ◽  
H.O. Toplan
Keyword(s):  
Production Waste ◽  
Aluminium Production ◽  
Refractory Ceramics

Electromagnetic waves transmission performance of alumina refractory ceramics in 2.45 GHz microwave heating

2019 ◽  
Vol 45 (17) ◽  
pp. 23493-23500 ◽  
Author(s):  
Xiaobiao Shang ◽  
Di Zhai ◽  
Fucheng Zhang ◽  
Cong Wei ◽  
Junruo Chen ◽  
...  
Keyword(s):  
Microwave Heating ◽  
Electromagnetic Waves ◽  
Transmission Performance ◽  
Alumina Refractory ◽  
Refractory Ceramics

scholarly journals Study of aluminium oxide from high-alumina refractory ceramics by thermoluminescence

2008 ◽  
Vol 31 (6) ◽  
pp. 891-895 ◽  
Author(s):  
V. Correcher ◽  
J. Garcia-Guinea ◽  
R. Gonzalez-Martin ◽  
E. Crespo-Feo ◽  
D. Jimenez-Cordero
Keyword(s):  
Aluminium Oxide ◽  
High Alumina ◽  
Alumina Refractory ◽  
Refractory Ceramics

FGM Fabrication by Combustion Synthesis

MRS Bulletin ◽  
1995 ◽  
Vol 20 (1) ◽  
pp. 52-53 ◽  
Author(s):  
Gregory C. Stangle ◽  
Yoshinari Miyamoto
Keyword(s):  
High Temperature ◽  
Combustion Synthesis ◽  
Volume Fraction ◽  
Synthesis Process ◽  
Composition Gradient ◽  
Synthesis Methods ◽  
High Temperature Synthesis ◽  
Exothermic Chemical Reaction ◽  
Reactant Powder ◽  
Refractory Ceramics

FGMs have been fabricated using the combustion synthesis (or self-propagating high-temperature synthesis (SHS)) process by exploiting a rapid and exothermic chemical reaction, in order to synthesize some (or all) of the constituents in an FGM to simultaneously increase its density. The thermal energy required to drive the process is derived from this internal, chemical source, rather than from an external and usually expensive source (e.g., a furnace). The combustion synthesis process is a powder-based process that has been used to synthesize over 300 compounds, and is particularly useful in preparing materials such as highly refractory ceramics and high-temperature intermetallics that are difficult to prepare by other synthesis methods. In addition, the process can be used to prepare ceramic-metal and ceramic-intermetallic composite materials. As a result, only slight modifications of the combustion synthesis are required to prepare functionally gradient materials from these same combinations of materials.Sample preparation begins by the creation of a series of mixtures from the powders that will react to form the constituent materials of the FGM sample. Each of these mixtures contains a slightly different percentage of reactants, so that each mixture will yield its own (predetermined) volume fraction of each of its constituents, following the combustion synthesis process. Prior to the combustion step, the samples are assembled by stacking layers of each of the reactant powder mixtures in appropriate amounts, in such a way that the multilayered powder mixture will faithfully produce the composition gradient that is required in the resultant FGM.

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