Particle Attrition Analysis in a High Temperature Rotating Drum

2008 ◽  
Author(s):  
B. R. Vijayarangan ◽  
Samir Moujaes ◽  
Michael Flores
Keyword(s):  
High Temperature ◽  
Rotating Drum ◽  
Particle Attrition ◽  
Attrition Analysis

Particle Attrition Characteristics in a Bubbling Fluidized Bed Under High Temperature and High Pressure Conditions

2014 ◽  
Vol 20 (4) ◽  
pp. 359-366 ◽  
Author(s):  
Jong-Ho Moon ◽  
Dong-Ho Lee ◽  
Ho-Jung Ryu ◽  
Young Cheol Park ◽  
Jong-Seop Lee ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Fluidized Bed ◽  
Bubbling Fluidized Bed ◽  
Particle Attrition

High temperature contact treatment of hard seed in Stylosanthes

1979 ◽  
Vol 30 (5) ◽  
pp. 847 ◽  
Author(s):  
JJ Mott
Keyword(s):  
High Temperature ◽  
High Surface ◽  
Contact Period ◽  
Rotating Drum ◽  
Optimum Temperature ◽  
Hard Seed ◽  
Stylosanthes Humilis ◽  
Seed Content ◽  
Metal Plates ◽  
Palisade Cells

Samples of hard seed of Stylosanthes humilis, S. hamata, S. scabra and S. viscosa were agitated on high temperature metal plates in order to reduce the hard seed content. The optimum temperature for reduction of hard seed was found to be 140–150°C, with a contact period of 15–30 s, and hard seed content was reduced by up to 70%. Internal seed temperatures generally remained below 70° during this treatment, and there was little loss of viability. As with percussion treatments, imbibition took place through the strophiole, which indicates that break of hard seed occurred by mechanical stresses fracturing the palisade cells at the strophiole. On the basis of this principle of high surface temperatures and brief seed contact, a heated rotating drum was constructed and successfully used to treat bulk quantities of hard seed.

Particle attrition with supersonic nozzles in a fluidized bed at high temperature

2012 ◽  
Vol 228 ◽  
pp. 385-394 ◽  
Author(s):  
Feng Li ◽  
Cedric Briens ◽  
Franco Berruti ◽  
Jennifer McMillan
Keyword(s):  
High Temperature ◽  
Fluidized Bed ◽  
Supersonic Nozzles ◽  
Particle Attrition

Influence of Thermo-Mechanical Processing on the Microstructure of Beryllia Dispersed Nickel Alloys

1973 ◽  
Vol 31 ◽  
pp. 184-185
Author(s):  
M.S. Grewal ◽  
S.A. Sastri ◽  
N.J. Grant
Keyword(s):  
High Temperature ◽  
Nickel Alloys ◽  
Thermomechanical Processing ◽  
Cold Work ◽  
High Temperature Strength ◽  
Strengthening Effect ◽  
Mechanical Processing ◽  
Uniform Dispersion ◽  
Oxide Particles ◽  
Nickel Base

Currently there is a great interest in developing nickel base alloys with fine and uniform dispersion of stable oxide particles, for high temperature applications. It is well known that the high temperature strength and stability of an oxide dispersed alloy can be greatly improved by appropriate thermomechanical processing, but the mechanism of this strengthening effect is not well understood. This investigation was undertaken to study the dislocation substructures formed in beryllia dispersed nickel alloys as a function of cold work both with and without intermediate anneals. Two alloys, one Ni-lv/oBeo and other Ni-4.5Mo-30Co-2v/oBeo were investigated. The influence of the substructures produced by Thermo-Mechanical Processing (TMP) on the high temperature creep properties of these alloys was also evaluated.

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

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.

Effect of Improved ThO2 Particle Dispersion in Nickel on High-Temperature Strength

1970 ◽  
Vol 28 ◽  
pp. 444-445
Author(s):  
E. R. Kimmel ◽  
H. L. Anthony ◽  
W. Scheithauer
Keyword(s):  
High Temperature ◽  
Metal Matrix ◽  
Oxide Particle ◽  
Oxide Phase ◽  
Dislocation Motion ◽  
Particle Dispersion ◽  
High Temperature Strength ◽  
Strengthening Effect ◽  
Oxide Particles ◽  
The Stability

The strengthening effect at high temperature produced by a dispersed oxide phase in a metal matrix is seemingly dependent on at least two major contributors: oxide particle size and spatial distribution, and stability of the worked microstructure. These two are strongly interrelated. The stability of the microstructure is produced by polygonization of the worked structure forming low angle cell boundaries which become anchored by the dispersed oxide particles. The effect of the particles on strength is therefore twofold, in that they stabilize the worked microstructure and also hinder dislocation motion during loading.

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