scholarly journals Microstructural Development of MnCO3 Microsphere Compacts through Hydrothermal Hot-Pressing

2021 ◽  
Author(s):  
Takahiro Kozawa
Keyword(s):  
Hot Pressing ◽  
Microstructural Development

Particle-Level Investigation of Densification During Uniaxial Hot Pressing: Continuum Modeling and Experiments

1992 ◽  
Vol 114 (1) ◽  
pp. 105-110 ◽  
Author(s):  
R. L. Williamson ◽  
J. R. Knibloe ◽  
R. N. Wright
Keyword(s):  
Hot Pressing ◽  
Composite System ◽  
Microstructural Development ◽  
Stress And Strain ◽  
Densification Rate ◽  
Strain Fields ◽  
Particle Distributions ◽  
Particle Level ◽  
Modeling And Experiments ◽  
Individual Particles

A combination of continuum models and experiments is used to investigate the deformation of individual particles during hot pressing. Results are described for both monosized and bimodal particle distributions, including a simple bimodal composite system. The effects of pressure and temperature on the densification rate, particle shape, and stress and strain fields are described. The detailed strain fields calculated by the model are useful for predicting microstructural development during the pressing process and thus can aid in the design of optimal pressing cycles.

Microstructural development of platelet alumina while hot-pressing to transparency

2021 ◽  
Author(s):  
Andrew P. Schlup ◽  
William J. Costakis ◽  
Jeffrey P. Youngblood ◽  
Rodney W. Trice
Keyword(s):  
Hot Pressing ◽  
Microstructural Development

Microstructural development of Si3N4–SiC–Y2O3 ceramics derived from polymeric precursors

1998 ◽  
Vol 13 (2) ◽  
pp. 353-361 ◽  
Author(s):  
Yuji Iwamoto ◽  
Ko-ichi Kikuta ◽  
Shin-ichi Hirano
Keyword(s):  
Heat Treatment ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Hot Pressing ◽  
Microstructural Development ◽  
Polymeric Precursors ◽  
Fine Grained ◽  
Chemically Modified ◽  
Amorphous Powders

[Si–Y–O–C–N] amorphous powders were synthesized by the pyrolysis at 1000 °C in N2 of chemically modified perhydropolysilazane using n-decyl alcohol and yttrium tri-methoxide. [Si–Y–O–C–N] amorphous powders yielded a unique fibrous microstructure by heat treatment in N2 at 1800 °C. The fibrous microstructure was composed of β–Si3N4 whiskers of submicron in diameter and more than 10 μm in length. Fully dense Si3N4 –SiC–Y2O3 ceramics were also fabricated by heat treatment at 1800 °C followed by powder-vehicle hot pressing at 1700 °C. After these two-step processings, [Si–Y–O–C–N] amorphous powders yielded a unique fine-grained microstructure composed of submicron grains with high aspect ratio.

scholarly journals Microstructural Development of Furan Resin by Hot-Pressing

TANSO ◽  
1987 ◽  
Vol 1987 (128) ◽  
pp. 7-11 ◽  
Author(s):  
Eiichi Yasuda ◽  
Yasuhiro Tanabe ◽  
Hiroshi Machino ◽  
Shiushich Kimura
Keyword(s):  
Hot Pressing ◽  
Microstructural Development ◽  
Furan Resin

Microstructural Development in Nb-Ti Multifilamentary Superconductors During Processing

1985 ◽  
Vol 43 ◽  
pp. 190-191
Author(s):  
A. W. West
Keyword(s):  
Heat Treatment ◽  
Critical Current Density ◽  
Copper Matrix ◽  
Wire Drawing ◽  
Heat Treatments ◽  
Microstructural Development ◽  
Final Size ◽  
Density Values ◽  
The Wire ◽  
Multifilamentary Superconductors

The influence of the filament microstructure on the critical current density values, Jc, of Nb-Ti multifilamentary superconducting composites has been well documented. However the development of these microstructures during composite processing is still under investigation.During manufacture, the multifilamentary composite is given several heat treatments interspersed in the wire-drawing schedule. Typically, these heat treatments are for 5 to 80 hours at temperatures between 523 and 573K. A short heat treatment of approximately 3 hours at 573K is usually given to the wire at final size. Originally this heat treatment was given to soften the copper matrix, but recent work has shown that it can markedly change both the Jc value and microstructure of the composite.

Processing and characterization of YBa2Cu3O7−x/Ag composites

1990 ◽  
Vol 48 (4) ◽  
pp. 46-47
Author(s):  
Jafar Javadpour ◽  
Bradley L. Thiel ◽  
Sarikaya Mehmet ◽  
Ilhan A. Aksay
Keyword(s):  
Composite System ◽  
Precursor Solution ◽  
Microstructural Development ◽  
Superconducting Properties ◽  
Practical Applications ◽  
Nitrate Precursor ◽  
Cold Pressed ◽  
Tape Cast ◽  
Composite Samples

Practical applications of bulk YBa2Cu3O7−x materials have been limited because of their inadequate critical current density (jc) and poor mechanical properties. Several recent reports have indicated that the addition of Ag to the YBa2Cu3O7−x system is beneficial in improving both mechanical and superconducting properties. However, detailed studies concerning the effect of Ag on the microstructural development of the cermet system have been lacking. Here, we present some observations on the microstructural evolution in the YBa2Cu3O7−x/Ag composite system.The composite samples were prepared by mixing various amounts (2.5 - 50 wt%) AgNO3 in the YBa2Cu3O7−x nitrate precursor solution. These solutions were then spray dried and the resulting powders were either cold pressed or tape cast. The microstructures of the sintered samples were analyzed using SEM (Philips 515) and an analytical TEM (Philips 430T).The SEM micrographs of the compacts with 2.5 and 50 wt% Ag addition sintered at 915°C (below the melting point of Ag) for 1 h in air are displayed in Figs. 1 and 2, respectively.

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