Densification and Phase Evolution of SHS Derived Ti2Aln Active Precursor Powders During Hot Pressing Processes

2017 ◽  
pp. 211-221
Author(s):  
L. Chlubny ◽  
J. Lis ◽  
P. Borowiak ◽  
K. Chabior ◽  
K. Zieleńska
Keyword(s):  
Hot Pressing ◽  
Phase Evolution ◽  
Precursor Powders ◽  
Active Precursor

The influence of precursor powders on the phase evolution, grain size and transport current properties of BSCCO 2223 Ag-sheathed tapes

2000 ◽  
Vol 331 (3-4) ◽  
pp. 285-291 ◽  
Author(s):  
Xiao-dong Su ◽  
Jai-moo Yoo ◽  
Jae-wong Ko ◽  
Hai-doo Kim ◽  
Hyung-sik Chung ◽  
...  
Keyword(s):  
Grain Size ◽  
Phase Evolution ◽  
Transport Current ◽  
Precursor Powders

Cryogenically Synthesized Mechanically Alloyed Calcia Stabilized Zirconia

2009 ◽  
Vol 67 ◽  
pp. 271-276 ◽  
Author(s):  
Raja Ram Prasad ◽  
B.S. Sunder Daniel
Keyword(s):  
Electron Microscopy ◽  
Phase Evolution ◽  
Precursor Powder ◽  
X Ray Diffraction ◽  
Stabilized Zirconia ◽  
Mechanically Alloyed ◽  
X Ray ◽  
Precursor Powders ◽  
Cryogenic Conditions ◽  
Scanning Electron

Precursor powder of calcia-stabilized zirconia (CSZ) with 4, 7 and 15 wt % was synthesized by mechanical alloying (MA) in cryogenic conditions. The phase evolution of the precursor powders over 100 hours of MA was analyzed by powder X-ray diffraction technique. Cylindrical shaped sensor elements of the calcined powders were fabricated in a uniaxial press followed by sintering at 15000C for 3 hours. Scanning electron microscopy (SEM) was used to analyze the microstructure of the sintered pellets. The co-relation between material compositions, microstructure of the sinter pellets and the electrical properties of the sensors are discussed.

Phase evolution and microstructure of highJcSiC doped MgB2fabricated by hot pressing

2009 ◽  
Vol 22 (7) ◽  
pp. 075014 ◽  
Author(s):  
B Qu ◽  
X D Sun ◽  
J-G Li ◽  
Z M Xiu ◽  
C P Xue
Keyword(s):  
Hot Pressing ◽  
Phase Evolution

scholarly journals Influence of Cu Content in Precursor Powders on the Phase Evolution and Superconducting Properties of Bi-2212 Superconductors

2017 ◽  
Vol 46 (3) ◽  
pp. 585-590 ◽  
Author(s):  
Zhang Shengnan ◽  
Li Chengshan ◽  
Hao Qingbin ◽  
Feng Jianqing ◽  
Zhang Pingxiang
Keyword(s):  
Phase Evolution ◽  
Superconducting Properties ◽  
Cu Content ◽  
Precursor Powders

Investigation of γ-Alon Structural Evolution during Sintering and Hot-Pressing

2009 ◽  
Vol 409 ◽  
pp. 313-316 ◽  
Author(s):  
Dariusz Zientara ◽  
Mirosław M. Bućko ◽  
Jerzy Lis
Keyword(s):  
Hot Pressing ◽  
Structural Changes ◽  
Structural Evolution ◽  
Phase Evolution ◽  
Pressureless Sintering ◽  
Low Dielectric ◽  
High Temperature Mechanical Properties ◽  
Thermal Expansion Coefficients ◽  
Infrared Wavelengths ◽  
Aluminium Oxynitride

Dense polycrystalline aluminium oxynitride with spinel structure, -alon, is noted for its excellent thermal properties, high-temperature mechanical properties, low dielectric constant, thermal expansion coefficients and intrinsic transparency extending from ultraviolet to mid-infrared wavelengths. The dense materials were made by reactive pressureless sintering or hot-pressing of the SHS derived powders. Powders were synthesized from mixtures of aluminium and corundum powders of different proportions. The products of the SHS synthesis were composed mostly of -alon and in lesser extend of aluminium nitride. Ground powders were pressureless sintered at temperatures of 1800-2100°C for 2-6hs as well as hot-pressed at 1750-1950°C for 1 h under 25 MPa in nitrogen flow. The present work is focused on phase evolution of -alon materials during pressureless sintering and hot-pressing. The structural changes of -alon, a Al2O3 and AlN were also examined.

Effect of precursor powders on phase evolution and electromagnetic properties of controlled melting processed Bi-2223 Ag-sheathed tapes

1998 ◽  
Vol 308 (1-2) ◽  
pp. 105-114 ◽  
Author(s):  
Ling Hua ◽  
Jaimoo Yoo ◽  
Jaewoong Ko ◽  
Haidoo Kim ◽  
Hyungsik Chung ◽  
...  
Keyword(s):  
Phase Evolution ◽  
Electromagnetic Properties ◽  
Precursor Powders

TEM Studies of Silicon Nitride-Silicon Carbide Nanocomposites

1997 ◽  
Vol 3 (S2) ◽  
pp. 411-412
Author(s):  
E. Y. Wang ◽  
X. Pan ◽  
J. P. Mansfield ◽  
T. Kennedy ◽  
S. Hampshire
Keyword(s):  
Fracture Toughness ◽  
Hot Pressing ◽  
Nitrogen Atmosphere ◽  
University Of Michigan ◽  
Sintering Aids ◽  
Processing Procedure ◽  
Analysis Laboratory ◽  
Amorphous Si ◽  
Precursor Powders ◽  
The University

Si3N4/SiC nanocomposites have been shown to exhibit excellent strength and fracture toughness compared to monolithic Si3N4 materials. Recently, the microstructure and chemistry of Si3N4-based nanocomposites fabricated by hot-pressing amorphous Si-C-N precursor powders has been investigated. In the present work, our studies on the microstructure of Si3N4/SiC nanocomposites made by hot-pressing the mixture of Si3N4 and SiC commercial powders are reported.Si3N4/SiC nanocomposites were prepared by hot-pressing at 1750 °C for 1 hour at 40 Mpa in a nitrogen atmosphere, with sintering aids of 5.5 wt% Y2O3 and 3 wt% Al2O3. The details of the processing procedure have been reported elsewhere. Two different materials were investigated in this work: specimen A consisting of 5 vol% β-SiC; and specimen B consisting of 5 vol% α-SiC. TEM specimens were prepared by conventional procedures. The microstructure and chemical composition were studied in the University of Michigan Electron Microbeam Analysis Laboratory on a JEOL 2000FX.

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