Effect of Heat Treatment on Superconducting Properties of Pure and Ti, Zr-Doped MgB2 Superconducting Wires Fabricated by In Situ PIT Method

2007 ◽  
pp. 1913-1918
Author(s):  
G. Yan ◽  
Ya Feng Lu ◽  
Y. Feng ◽  
Ping Xiang Zhang ◽  
L. Zhou ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Superconducting Properties ◽  
Superconducting Wires

Effect of Heat Treatment on Superconducting Properties of Pure and Ti, Zr-Doped MgB2 Superconducting Wires Fabricated by In Situ PIT Method

2007 ◽  
Vol 546-549 ◽  
pp. 1913-1918
Author(s):  
G. Yan ◽  
Ya Feng Lu ◽  
Y. Feng ◽  
Ping Xiang Zhang ◽  
Lian Zhou ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Superconducting Properties ◽  
Superconducting Wires

Superconducting properties and heat treatment condition on in-situ PIT MgB2 tapes made from Mg flakes

2006 ◽  
Vol 445-448 ◽  
pp. 788-792 ◽  
Author(s):  
N. Harada ◽  
O. Miura ◽  
H. Takemasa ◽  
Y. Hino ◽  
D. Ito
Keyword(s):  
Heat Treatment ◽  
Treatment Condition ◽  
Heat Treatment Condition ◽  
Superconducting Properties

Effect of Two-Stage Heat Treatment on Superconducting Properties for In-Situ${\rm MgB}_{2+{\rm x}}$ Tapes Using Mg Flakes

2007 ◽  
Vol 17 (2) ◽  
pp. 2810-2813 ◽  
Author(s):  
Osuke Miura ◽  
Atsuhiro Saeki ◽  
Hiroshi Tomioka ◽  
Daisuke Ito ◽  
Naoyuki Harada
Keyword(s):  
Heat Treatment ◽  
Superconducting Properties ◽  
Two Stage ◽  
Stage Heat Treatment

Reaction Diffusion Behaviour in Bronze Route Cu-Nb-Sn Superconducting Wires

2006 ◽  
Vol 258-260 ◽  
pp. 152-157
Author(s):  
Simon C. Hopkins ◽  
K.S. Tan ◽  
I. Pong ◽  
Bartek A. Glowacki
Keyword(s):  
Heat Treatment ◽  
Reaction Diffusion ◽  
Heat Treatments ◽  
Matrix Composition ◽  
Superconducting Wires ◽  
Reaction Diffusion Model ◽  
Wire Cross Section ◽  
The Wire ◽  
Diffusion Behaviour

The bronze process is a mature technology for the production of Nb3Sn superconducting wires exploiting reaction diffusion behaviour in the Cu-Nb-Sn system. However, the superconducting properties depend strongly on the applied heat treatment, and optimisation of the heat treatment is still largely by trial and improvement. Modelling of the reaction-diffusion behaviour would allow improved heat treatments to be designed; combination of this with a nondestructive in situ characterisation technique would also permit improved superconducting wires to be produced. A finite difference reaction diffusion model has been designed to permit rapid calculation of the bronze matrix composition and Nb3Sn layer thickness profiles across the wire cross-section as a function of time for any applied heat treatment. The model has also been designed to calculate the electrical resistivity of the wire, which has previously been demonstrated as a suitable in situ characterisation technique. This model has been applied to isothermal and more complex heat treatments and compared with experimental results. Good qualitative agreement has been found, and plans for further improvement of the model are described in detail.

Significant improvement in superconducting properties of in situ powder-in-tube MgB2 wires through anthracene doping and heat treatment optimization

2019 ◽  
Vol 32 (10) ◽  
pp. 105004 ◽  
Author(s):  
Chunyan Li ◽  
Hongli Suo ◽  
Lin Ma ◽  
Liangqun Yang ◽  
Minoru Maeda ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Superconducting Properties ◽  
Treatment Optimization ◽  
Mgb2 Wires ◽  
Heat Treatment Optimization ◽  
Powder In Tube

Effects of heat treatment on the superconducting properties of Bi2Sr2CaCu2Ox fibers produced by the laser-heated pedestal growth method

1990 ◽  
Vol 5 (3) ◽  
pp. 351-357 ◽  
Author(s):  
J.M. Brenner ◽  
R.S. Feigelson ◽  
D. Gazit ◽  
P.N. Peszkin
Keyword(s):  
Heat Treatment ◽  
Superconducting Properties ◽  
Growth Method ◽  
Laser Heated

Mechanical Properties of Pyrolytic "SiOCN" Thin Coatings

1993 ◽  
Vol 308 ◽  
Author(s):  
Sandrine Bec ◽  
André Tonck ◽  
Jean-Luc Loubet
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Ceramic Coatings ◽  
Optical Observation ◽  
Thin Coatings ◽  
Polymer Precursors ◽  
Polymeric State

ABSTRACTPyrolysis of polymer precursors (polysilazane) is a technologically and economically interesting way to produce thin ceramic coatings. However, many cracks appear and decohesion occurs during pyrolysis when the ceramic coatings (SiOCN) are thicker than 0.5 micrometers. In order to understand these cracking phenomena, the coatings are mechanically characterized by nanoindentation at different stages of the pyrolysis heat treatment.During pyrolysis, the cracking temperature is detected by in-situ optical observation. The thickness of the coatings varies during pyrolysis from 3 micrometers at the polymeric state to 1 micrometer at the ceramic state. The coatings' properties, hardness and Young's modulus are evaluated after heat treatment, taking into account the substrate's influence. A large variation of these properties occurs at the cracking temperature. Both the hardness and the Young's modulus are multiplied by a factor of 10. By analysing these results, we show that cracking is correlated with the evolution of the coatings' mechanical properties during the transformation.

In Situ X-Ray Diffraction Studies of Crystallization Growth Behavior in ZnO-Bi2O3-B2O3 Glass as a Route to Functional Optical Devices

MRS Advances ◽  
2018 ◽  
Vol 3 (11) ◽  
pp. 563-567 ◽  
Author(s):  
Quentin Altemose ◽  
Katrina Raichle ◽  
Brittani Schnable ◽  
Casey Schwarz ◽  
Myungkoo Kang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Glass Ceramics ◽  
Treatment Temperature ◽  
Crystal Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
In Situ Xrd ◽  
Dsc Measurements ◽  
Transmission Window

ABSTRACTTransparent optical ZnO–Bi2O3–B2O3 (ZBB) glass-ceramics were created by the melt quenching technique. In this work, a melt of the glass containing stoichiometric ratios of Zn/Bi/B and As was studied. Differential scanning calorimeter (DSC) measurements was used to measure the thermal behavior. VIS/NIR transmission measurements were used to determine the transmission window. X-ray diffraction (XRD) was used to determine crystal phase. In this study, we explore new techniques and report a detailed study of in-situ XRD of the ZBB composition in order to correlate nucleation temperature, heat treatment temperature, and heat treatment duration with induced crystal phase.

scholarly journals Additive Manufacturing of Ti-Based Intermetallic Alloys: A Review and Conceptualization of a Next-Generation Machine

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4317
Author(s):  
Thywill Cephas Dzogbewu ◽  
Willie Bouwer du Preez
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Additive Manufacturing ◽  
Complex Geometries ◽  
Intermetallic Alloys ◽  
Tial Alloys ◽  
Conventional Methods ◽  
Manufacturing Technologies ◽  
In Situ Heat Treatment

TiAl-based intermetallic alloys have come to the fore as the preferred alloys for high-temperature applications. Conventional methods (casting, forging, sheet forming, extrusion, etc.) have been applied to produce TiAl intermetallic alloys. However, the inherent limitations of conventional methods do not permit the production of the TiAl alloys with intricate geometries. Additive manufacturing technologies such as electron beam melting (EBM) and laser powder bed fusion (LPBF), were used to produce TiAl alloys with complex geometries. EBM technology can produce crack-free TiAl components but lacks geometrical accuracy. LPBF technology has great geometrical precision that could be used to produce TiAl alloys with tailored complex geometries, but cannot produce crack-free TiAl components. To satisfy the current industrial requirement of producing crack-free TiAl alloys with tailored geometries, the paper proposes a new heating model for the LPBF manufacturing process. The model could maintain even temperature between the solidified and subsequent layers, reducing temperature gradients (residual stress), which could eliminate crack formation. The new conceptualized model also opens a window for in situ heat treatment of the built samples to obtain the desired TiAl (γ-phase) and Ti3Al (α2-phase) intermetallic phases for high-temperature operations. In situ heat treatment would also improve the homogeneity of the microstructure of LPBF manufactured samples.

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