Influence of milling energy of in-situ precursor powder on the properties of Ti-doped MgB2

2020 ◽  
Vol 571 ◽  
pp. 1353617
Author(s):  
W. Häßler ◽  
J. Scheiter ◽  
C. Damm
Keyword(s):  
Precursor Powder ◽  
Doped Mgb2

Formation of in-situ reinforced microstructure in α–sialon ceramics I: Stoichiometric oxygen-rich compositions

2002 ◽  
Vol 17 (2) ◽  
pp. 336-342 ◽  
Author(s):  
Zhijian Shen ◽  
Hong Peng ◽  
Mats Nygren
Keyword(s):  
Hot Pressing ◽  
Single Phase ◽  
Transient Liquid Phase ◽  
Precursor Powder ◽  
Temperature Dependent ◽  
Consolidation Process ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Equiaxed Grains

The abnormal grain growth in α–sialon ceramics was investigated. The preparations had stoichiometric compositions on the oxygen-rich phase boundary, and they were stabilized by Y, Nd, Sm, Dy, and Yb, respectively. Specimens were prepared from α–Si3N4 as precursor powder by applying conventional hot pressing and a novel rapid consolidation process, namely spark plasma sintering (SPS). Single-phase α–sialon ceramics with in situ reinforced bimodal microstructure, i.e., large elongated grains embedded in a matrix consisting of small equiaxed grains, were obtained above 1750 °C in all systems compacted by SPS and above 1800 °C in systems stabilized by Nd and Sm but not Dy, Y, or Yb by a two-step hot-pressing procedure. It was observed that the formation of abnormally grown α–sialon grains was strongly temperature-dependent, indicating that it was encouraged by the formation of a transient liquid phase that stimulated the dissolution of any remaining nitride precursors and early formed small α–sialon grains and sequentially facilitated supersaturation by the α–sialon constituents. The presence of elongated grains improves fracture resistance in the obtained materials.

Cu and nano-SiC doped MgB2 thick films on Ni substrates processed using a very short-time in situ reaction

2004 ◽  
Vol 402 (1-2) ◽  
pp. 38-44 ◽  
Author(s):  
Q.W. Yao ◽  
X.L. Wang ◽  
J. Horvat ◽  
S.X. Dou
Keyword(s):  
Thick Films ◽  
In Situ Reaction ◽  
Short Time ◽  
Doped Mgb2

scholarly journals Dependence of magnetoelectric properties on sintering temperature for nano-SiC-doped MgB2/Fe wires made by combined in situ/ex situ process

2012 ◽  
Vol 111 (7) ◽  
pp. 07E135 ◽  
Author(s):  
W. X. Li ◽  
R. Zeng ◽  
J. L. Wang ◽  
Y. Li ◽  
S. X. Dou
Keyword(s):  
Sintering Temperature ◽  
Ex Situ ◽  
Magnetoelectric Properties ◽  
Doped Mgb2

scholarly journals In-Situ Manufacturing of SiC-Doped MgB2 Used for Superconducting Wire

2021 ◽  
Vol 45 (2) ◽  
pp. 175-179
Author(s):  
Satrio Herbirowo ◽  
Agung Imaduddin ◽  
Hendrik ◽  
Andika Widya Pramono ◽  
Sunardi ◽  
...  
Keyword(s):  
Critical Temperature ◽  
Magnesium Diboride ◽  
Morphological Characteristics ◽  
X Ray ◽  
Stainless Steel 304 ◽  
Mgb2 Wire ◽  
Carbon Substitution ◽  
Doped Mgb2 ◽  
Powder In Tube

Magnesium diboride (MgB2) is a highly potential superconducting material, in substitution of Nb3Sn, which has a critical temperature of ~ 39 K. This synthesis and manufacturing of MgB2 wire were conducted by in-situ powder in tube (PIT). The method doped with silicon carbide (SiC) was aimed to study the effect of phase formation on carbon substitution and morphological characteristics with the motivation to improve superconductivity properties. Magnesium, boron, and SiC powders were synthesized and functionally processed with stainless Steel 304 tube. Heat treatment was conducted at 750℃, 800℃, and 850℃ for 2 hours followed by furnace cooling. Characterization was carried out by x-ray diffractometer (XRD), scanning electron microscopy (SEM), and cryogenic magnet testing. The results showed that 1% SiC optimally increased the zero critical temperature of MgB2 ~ 37.18 K along with the sintering at 750℃ for 2 hours.

scholarly journals Corrosion Resistance of Titanium Based Composites Reinforced with in situ TiB Precipitation Phase

2016 ◽  
Vol 61 (4) ◽  
pp. 1767-1770 ◽  
Author(s):  
A. Miklaszewski
Keyword(s):  
Corrosion Resistance ◽  
Composite Structures ◽  
Processing Parameters ◽  
Precursor Powder ◽  
Nacl Solution ◽  
Powder Preparation ◽  
Linear Voltammetry ◽  
Precipitation Phase ◽  
Morphology Influence

Abstract The paper presents the results of corrosion resistance tests carried out on titanium based composites reinforced with different TiB precipitation phase amount, dependent from boron addition in starting powder blends. Precursor powder preparation and processing parameters of conventional powder metallurgical approach influence density and obtained porosity of bulk compacts. The potentiodynamic tests performed in 0.1 M NaCl solution by the technique of linear voltammetry shows visible difference between compared composite structures. Studies have confirmed that the reinforcement phase amount and its morphology influence obtained microstructure and have important effect on the composite corrosion resistance.

Rendez vous with Saturn's rings

1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock
Keyword(s):  
Solar Energy ◽  
Electric Propulsion ◽  
Power Source ◽  
Propulsion System ◽  
Low Thrust ◽  
Ring Plane ◽  
The Earth ◽  
Total Impulse ◽  
Saturn's Rings

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.

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