Containerless processing for preparation of akermanite bioceramic spheres with homogeneous structure, tailored bioactivity and degradation

2013 ◽  
Vol 1 (7) ◽  
pp. 1019-1026 ◽  
Author(s):  
Chengtie Wu ◽  
Minghui Zhang ◽  
Dong Zhai ◽  
Jianding Yu ◽  
Yan Liu ◽  
...  
Keyword(s):  
Homogeneous Structure ◽  
Containerless Processing

scholarly journals Localising the smallest stiffness and its direction of a homogeneous structure by spectral and optimisation approaches

2021 ◽  
Vol 232 ◽  
pp. 111842
Author(s):  
Petr Henyš ◽  
Danas Sutula ◽  
Jiří Kopal ◽  
Michal Kuchař ◽  
Lukáš Čapek
Keyword(s):  
Homogeneous Structure

TEM Characterization of Pseudotetragonal Mullite

2001 ◽  
Vol 7 (S2) ◽  
pp. 426-427
Author(s):  
Bradley R. Johnson ◽  
Waltraud M. Kriven
Keyword(s):  
Phase Diagram ◽  
Spatial Relationship ◽  
Equilibrium Structure ◽  
Lattice Parameters ◽  
Orthorhombic Structure ◽  
Containerless Processing ◽  
Rich Phase ◽  
Tem Characterization ◽  
Solution Field

Mullite (3Al2O3•2SiO2) exists in a solid solution field (∼57-63 mol% Al2O3) as the only stable compound in the Al2O3•SiO2 phase diagram at ambient pressures. Equilibrium 3:2 mullite has an orthorhombic structure with b>a (o-mullite). However, when initially crystallized from molecularly mixed, 3:2 precursors at temperatures < 1200°C, the first phase that forms has lattice parameters with a ≈b. This structure is often termed pseudotetragonal mullite (pt-mullite), since even when the ‘a’ and ‘b’ lattice parameters are identical, they are symmetrically independent. Pseudotetragonal mullite has been shown to contain approx. 70 mol% Al2O3. with increasing time and temperature, the structure gradually assimilates the residual SiO2, and the lattice parameters change, such that by 1400°C, the material has attained its equilibrium structure and composition.TEM was used to determine the spatial relationship between the crystalline phase and the residual, amorphous, SiO2-rich phase in pt-mullite. The starting materials were quenched, 3:2 mullite beads and fibers (made by containerless processing).

Overview of Containerless Processing Technologies

1981 ◽  
Vol 9 ◽  
Author(s):  
M. Barmatz
Keyword(s):  
Space Shuttle ◽  
Physical Contact ◽  
Materials Processing ◽  
Containerless Processing ◽  
Processing Technologies ◽  
Air Jets ◽  
Developmental Progress ◽  
Processing Techniques ◽  
And Control ◽  
Near Future

ABSTRACTIn the near future, a large segment of the scientific community will have an opportunity to perform materials processing experiments on the Space Shuttle in the reduced gravity environment of space. Many of these experiments will require containerless processing techniques that provide manipulation and control of weightless (molten) materials without physical contact with container walls or other holding devices. A variety of containerless processing technologies are now being developed for space and ground-based materials processing facilities. The utilization of air jets or high intensity acoustic, electromagnetic or electrostatic fields can produce forces that support and manipulate materials. Most of the present containerless research is directed toward the development of high temperature systems capable of melting and resolidifying materials. This paper will review the materials processing capabilities and level of developmental progress of each technique. An introduction to available NASA test facilities will also be given.

scholarly journals Normal forms on contracting foliations: smoothness and homogeneous structure

2016 ◽  
Vol 183 (1) ◽  
pp. 181-194 ◽  
Author(s):  
Boris Kalinin ◽  
Victoria Sadovskaya
Keyword(s):  
Normal Forms ◽  
Homogeneous Structure

A distributed method for reconfiguration of a three-dimensional homogeneous structure

1998 ◽  
Vol 13 (4) ◽  
pp. 363-379 ◽  
Author(s):  
Echi Yoshida ◽  
Satoshi Murata ◽  
Haruhisa Kurokawa ◽  
Kohji Tomita ◽  
Shigeru Kokaji
Keyword(s):  
Three Dimensional ◽  
Homogeneous Structure ◽  
Distributed Method
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