Influence of Sintering Conditions on Bending Tolerance at RT and I c of In Situ MgB2 wire

2019 ◽  
Vol 29 (5) ◽  
pp. 1-4 ◽  
Author(s):  
Hideki Tanaka ◽  
Takaaki Suzuki ◽  
Motomune Kodama ◽  
Gen Nishijima ◽  
Akiyoshi Matsumoto
Keyword(s):  
Mgb2 Wire ◽  
Sintering Conditions

Tensile and Bending Stress Tolerance on Round MgB2 Wire Made By In Situ PIT Process

2018 ◽  
Vol 28 (4) ◽  
pp. 1-5 ◽  
Author(s):  
Hideki Tanaka ◽  
Takayuki Suzuki ◽  
Motomune Kodama ◽  
Yota Ichiki ◽  
Toshio Haba ◽  
...  
Keyword(s):  
Stress Tolerance ◽  
Bending Stress ◽  
Mgb2 Wire

Effect of C Content on Properties and Microstructure of Steel-Bonded Cemented Carbide GT35 Produced by In Situ Reduction of Ilmenite

2009 ◽  
Vol 610-613 ◽  
pp. 687-691 ◽  
Author(s):  
Yi Wu ◽  
Xin Wang ◽  
Fei Long ◽  
Yu Fang Shen ◽  
Zheng Guang Zou
Keyword(s):  
Mechanical Properties ◽  
Carbothermic Reduction ◽  
Bending Strength ◽  
Low Cost ◽  
Cemented Carbide ◽  
Steel Matrix ◽  
In Situ Reduction ◽  
The Mean ◽  
Sintering Conditions

Steel-bonded cemented carbide GT35 was fabricated from natural ilmenite by in-situ carbothermic reduction and vacuum pressureless sintering. The effects of C content on the mechanical properties and microstructures of GT35 composites were investigated. As an excellent reducer, carbon provides an impetus for a series of reductive process. C content determines the melting point of the steel matrix, and directly affects the mechanism of dissolving and segregating of TiC particles, forming a netlike microstructure. Besides, the liquid steel whose viscosplasticity is determined by C content was coated on the surface of the composite and refrained the release of CO. The results showed that the good mechanical properties of steel-bonded cemented carbide GT35 composite were obtained with 0.9wt.% C at the same sintering conditions and the density reached 6.12g/cm3, the average bending strength was over 1229MPa after heat treatment, the mean hardness HRC was 69.4. It also showed that in-situ reduction of natural limonite was a feasible way to fabricate good performance GT35 composite with a relatively low cost.

Electro-mechanical behaviour of in situ W added MgB2 wire

Cryogenics ◽  
2014 ◽  
Vol 60 ◽  
pp. 5-8 ◽  
Author(s):  
P. Kováč ◽  
L. Kopera ◽  
T. Melišek ◽  
I. Hušek
Keyword(s):  
Mechanical Behaviour ◽  
Mgb2 Wire

scholarly journals Sintering of Ti(C,N)-WC/Mo2C-(Ta,Nb)C-Co/Ni Cermets Investigated by CO and N2 Outgassing

Metals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 427 ◽  
Author(s):  
Viktoria Schwarz ◽  
Fabio Scagnetto ◽  
Walter Lengauer
Keyword(s):  
Evolved Gases ◽  
Calibration Measurement ◽  
Solid State Sintering ◽  
Before And After ◽  
Binder Composition ◽  
Sintering Conditions ◽  
Metallurgical Reactions ◽  
N Powder ◽  
Insight Into

Cermets of the type Ti(C,N)-WC/Mo2C-(Ta,Nb)C-Co/Ni with changing [Mo]/([Mo] + [W]) ratio were subjected to an investigation of outgassing of CO and N2 upon sintering. Quantification of CO and N2 was performed by gas calibration, measurement of masses 12 (12C), 14 (14N) and 28 (28CO and 28N2), as well as C, N, O analysis of the samples before and after sintering. The formation of CO occurs at lower temperatures than that of N2, both gases being completely evolved already at solid-state sintering conditions. If pre-alloyed powders are employed in the starting formulation, the amount of evolved gases is substantially reduced, because part of the formation of mixed hard phases is anticipated. Changing binder composition from Co:Ni = 1:1 to 2:1 and 3:1 does not change the outgassing characteristics, while different batches of nominally the same Ti(C,N) powder can have significant influence. Mass spectrometry is a most valuable in situ tool for getting insight into the metallurgical reactions occurring upon sintering. These reactions result in the typical microstructure and influence the properties of cermets.

Fabrication of the 19-filament Fe/Cu clad MgB2 wire via in situ powder-in-tube method

2007 ◽  
Vol 52 (19) ◽  
pp. 2621-2625 ◽  
Author(s):  
ZhengGuang Yu ◽  
YanWei Ma ◽  
DongLiang Wang ◽  
ZhaoShun Gao ◽  
XianPing Zhang
Keyword(s):  
Mgb2 Wire ◽  
Powder In Tube

Fabrication of Cu-sheathed MgB2 wire with high Jc–B performance using a mixture of in situ and ex situ PIT techniques

2009 ◽  
Vol 469 (15-20) ◽  
pp. 1531-1535 ◽  
Author(s):  
T. Nakane ◽  
K. Takahashi ◽  
H. Kitaguchi ◽  
H. Kumakura
Keyword(s):  
Ex Situ ◽  
Mgb2 Wire

scholarly journals Synthesis of Dense MgB2 Superconductor via In Situ and Ex Situ Spark Plasma Sintering Method

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7395
Author(s):  
Joseph Longji Dadiel ◽  
Sugali Pavan Kumar Naik ◽  
Paweł Pęczkowski ◽  
Jun Sugiyama ◽  
Hiraku Ogino ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Microstructural Characterization ◽  
Ex Situ ◽  
Synthesis Methods ◽  
Mgb2 Bulk ◽  
Bulk Superconductors ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Sintering Conditions

In this study, high-density magnesium diboride (MgB2) bulk superconductors were synthesized by spark plasma sintering (SPS) under pressure to improve the field dependence of the critical current density (Jc-B) in MgB2 bulk superconductors. We investigated the relationship between sintering conditions (temperature and time) and Jc-B using two methods, ex situ (sintering MgB2 synthesized powder) and in situ (reaction sintering of Mg and B powder), respectively. As a result, we found that higher density with suppressed particle growth and suppression of the formation of coarse particles of MgB4 and MgO were found to be effective in improving the Jc-B characteristics. In the ex situ method, the degradation of MgB2 due to pyrolysis was more severe at temperatures higher than 850 °C. The sample that underwent SPS treatment for a short time at 850 °C showed higher density and less impurity phase in the bulk, which improved the Jc-B properties. In addition, the in situ method showed very minimal impurity with a corresponding improvement in density and Jc-B characteristics for the sample optimized at 750 °C. Microstructural characterization and flux pinning (fP) analysis revealed the possibility of refined MgO inclusions and MgB4 phase as new pinning centers, which greatly contributed to the Jc-B properties. The contributions of the sintering conditions on fP for both synthesis methods were analyzed.

Microstructural Design by Selective Grain Growth of β-Si3N4

1992 ◽  
Vol 287 ◽  
Author(s):  
Naoto Hirosaki ◽  
Yoshio Akimune ◽  
Mamoru Mitomo
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Material Properties ◽  
Weibull Modulus ◽  
Sintered Material ◽  
High Reliability ◽  
Uniform Size ◽  
Microstructural Design ◽  
Sintering Conditions

ABSTRACTRaw β-Si3N4 powder was gas-pressure sintered with Y2 O3-Nd2O3additives at > 1700ºC. Graingrowth behavior was investigated in relation to sintering conditions. Selective growth of large grains was accomplished by sintering the powder at high temperatures with small amounts of additives. As a result, in-situ composites were obtained from β-powder.The desired material properties have been attained by controlling the microstructural design using large grains. Materials with high reliability, having a Weibull modulus of about 50, were fabricated by maintaining a uniform size and distribution of elongated grains. Tough materials, having fracture toughness of, were developed by increasing the diameter of elongated grains. This method was applied to the sintering of refractory grade powder with the aim of lowering sintered material cost. Fairly good mechanical properties have been obtained even with impure powders.

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.

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