scholarly journals Applicability of Infrared Thermography for the Detection of Phase Transitions in Metal Alloys

2021 ◽  
Vol 11 (19) ◽  
pp. 8885
Author(s):  
Clément Mailhé ◽  
Alexandre Godin ◽  
Amélie Veillère ◽  
Marie Duquesne
Keyword(s):  
Phase Transitions ◽  
Infrared Thermography ◽  
Phase Change Materials ◽  
Metal Alloys ◽  
Detection Capability ◽  
Complex Phase ◽  
Pure Sample ◽  
Dsc Measurements ◽  
Multiple Samples ◽  
Dsc Calibration

This work aims at assessing the applicability of a screening-oriented device dedicated to the establishment of increasingly complex phase diagrams of phase change materials. A thermography-based method has recently been proven to allow the detection of phase transitions of organic materials for multiple samples at a time. The phase transition detection capability of the infrared thermography method is here evaluated for metal systems based on well-referenced materials commonly employed in DSC calibration (pure sample of Gallium and a mixture of Gallium and Indium). The detected transitions are compared to literature data and DSC measurements. All transitions documented in the literature could be retrieved by thermography, and liquidus transitions are validated with DSC measurements. The encouraging nature of the results is discussed, and avenues for improving the method are considered.

scholarly journals Improved infrared thermography method for fast estimation of complex phase diagrams

2019 ◽  
Vol 675 ◽  
pp. 84-91 ◽  
Author(s):  
Clément Mailhé ◽  
Marie Duquesne ◽  
Imane Mahroug ◽  
Elena Palomo del Barrio
Keyword(s):  
Phase Diagrams ◽  
Infrared Thermography ◽  
Complex Phase ◽  
Fast Estimation

scholarly journals Photoacoustic characterization of phase transitions in amorphous metal alloys

1998 ◽  
Vol 66 (2) ◽  
pp. 245-249 ◽  
Author(s):  
D.J. Orzi ◽  
G.M. Bilmes ◽  
J.O. Tocho ◽  
N. Mingolo ◽  
O.E. Martínez
Keyword(s):  
Phase Transitions ◽  
Amorphous Metal ◽  
Metal Alloys ◽  
Amorphous Metal Alloys

scholarly journals A Comparative Study on the Thermal Energy Storage Performance of Bio-Based and Paraffin-Based PCMs Using DSC Procedures

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1705 ◽  
Author(s):  
Mona Nazari Sam ◽  
Antonio Caggiano ◽  
Christoph Mankel ◽  
Eddie Koenders
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Measurement Errors ◽  
Phase Change Materials ◽  
Alternative Methods ◽  
Classical Dynamic ◽  
Human Thermal Comfort ◽  
Dsc Measurements

Thermal-Energy Storage (TES) properties of organic phase change materials have been experimentally investigated and reported in this paper. Three paraffin-based Phase Change Materials (PCMs) and one bio-based PCM are considered with melting temperatures of 24 °C, 25 °C and 26 °C. Sensible heat storage capacities, melting characteristics and latent heat enthalpies of the studied PCMs are investigated through Differential Scanning Calorimetry (DSC) measurements. Two alternative methods, namely the classical dynamic DSC and a stepwise approach, are performed and compared with the aim to eliminate and/or overcome possible measurement errors. In particular, for DSC measurements this could be related to the size of the samples and its representativity, heating rate effects and low thermal conductivity of the PCMs, which may affect the results and possibly cause a loss of objectivity of the measurements. Based on results achieved from this study, clear information can be figured out on how to conduct and characterize paraffin and bio-based PCMs, and how to apply them in TES calculations for building applications and/or simulations. It is observed that both paraffinic and bio-based PCMs possess a comparable TES capacity within the selected phase transition temperature, being representative for the human thermal comfort zone. The phase change of bio-based PCMs occurred over a much narrower temperature range when compared to the wider windows characterizing the paraffin-based materials. Bio-based PCMs turned out to be very suitable for building applications and can be an environmentally friendly substitute for petroleum-based PCMs.

NQR, DSC, and X-Ray Structure Studies of Pyridinium Tetrabromozincate and Pyridinium Tetrabromocadmate (C5H5NH)2MBr4 · nH2O (M = Zn and Cd; n = 0, 1); Phase Transitions and Weak Hydrogen Bond Interactions

2011 ◽  
Vol 66 (12) ◽  
pp. 1261-1269
Author(s):  
Hideta Ishihara ◽  
Naoko Hatano ◽  
Keizo Horiuchi ◽  
Hiromitsu Terao ◽  
Ingrid Svoboda ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Positive Temperature ◽  
Triclinic Space Group ◽  
Hydrogen Bond Interactions ◽  
Dsc Measurements ◽  
First Order Phase Transition ◽  
Increasing Temperature ◽  
First Order Phase ◽  
Metastable Forms ◽  
T Phase

Crystals of pyridinium tetrabromozincate and pyridinium tetrabromocadmate were obtained as monohydrates and anhydrous compounds. The crystal structure of metastable (C5H5NH)2- CdBr4・H2O was determined at 300(2) K; triclinic space group P1̄ with a = 7.875(2), b = 8.151(1), and c = 16.356(2) Å, α = 79.260(10), β = 86.030(10), and γ = 61.440(10)°, Z = 2. All compounds except for stable (C5H5NH)2CdBr4・H2O gave four 81Br NQR lines at temperatures between 77 and around 325 K. The stable (C5H5NH)2CdBr4・H2O undergoes a first-order phase transition at TC = 116 K. Four 81Br NQR lines below TC merged into two with equal intensities above TC, indicating a 180° flip motion of water molecules in the r. t. phase. The 81Br NQR lines of the two anhydrous compounds faded out around 325 K probably due to the reorientational motion of ZnBr42− or CdBr42− ions. The respective two 81Br NQR lines of the hydrates exhibited anomalous positive temperature dependence. This is considered to be induced by a weakening in the interionic C-H・ ・ ・Br hydrogen bonds with increasing temperature. The DSC measurements of the anhydrous compounds have revealed phase transitions above r. t. The thermal behavior of (C5H5NH)2CdBr4 is complicated by the formation of metastable forms.

scholarly journals Nanofluid based on self-nanoencapsulated metal/metal alloys phase change materials with tuneable crystallisation temperature

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Nuria Navarrete ◽  
Alexandra Gimeno-Furio ◽  
Rosa Mondragon ◽  
Leonor Hernandez ◽  
Luis Cabedo ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Metal Alloys ◽  
Metal Metal ◽  
Crystallisation Temperature

scholarly journals Phase Transitions in the Co–Al–Nb–Mo System

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1887
Author(s):  
Denis Davydov ◽  
Nataliya Kazantseva ◽  
Nikolai Popov ◽  
Nina Vinogradova ◽  
Igor Ezhov
Keyword(s):  
Crystal Structure ◽  
Electron Microscopy ◽  
Phase Transitions ◽  
Vacuum Solution ◽  
Intermetallic Phase ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Dsc Measurements ◽  
Transmission Electron ◽  
L12 Structure

Phase transitions in the Co-rich part of the Co–Al–Nb–Mo phase diagram are studied by energy dispersive spectroscopy (EDS), X-ray analysis, transmission electron microscopy (TEM), and differential scanning calorimetry (DSC) measurements. The obtained results were compared with the results for alloys of the binary Co–Al and ternary Co–Al–Nb, and Co–Al–Mo systems. Formation of the intermetallic phase with the L12 structure was found in a range of alloys with 10 at.% Al, 2–9 at.% Nb, and 3–7 at.% Mo. Intermetallic compound Co2Nb, Laves phase with the different chemical composition and crystal structure (C14 and C36) was detected in the Co–Al–Nb and Co–Al–Nb–Mo samples after vacuum solution treating at 1250 °C for 30 h.

Phase-Change Materials/HDPE Composite Filament: A First Step Toward Use With 3D Printing for Thermal Management Applications

2019 ◽  
Vol 11 (5) ◽  
Author(s):  
Thomas B. Freeman ◽  
David Spitzer ◽  
Patrick N. Currier ◽  
Virginie Rollin ◽  
Sandra K.S. Boetcher
Keyword(s):  
Thermal Properties ◽  
Electron Microscope ◽  
Phase Change ◽  
Thermal Management ◽  
Latent Heat ◽  
Phase Change Materials ◽  
3D Printer ◽  
Dsc Measurements ◽  
Composite Filament ◽  
Scanning Electron

Phase-change materials (PCMs) are a useful alternative to more traditional methods of thermal management of various applications. PCMs are materials that absorb large amounts of latent heat and undergo solid-to-liquid phase change at near-constant temperature. The goal of the research is to experimentally investigate the thermal properties of a novel shape-stabilized PCM/HDPE composite extruded filament. The extruded filament can then be used in a 3D printer for custom PCM/HDPE shapes. The PCM used in the study is PureTemp PCM 42, which is an organic-based material that melts around 42 °C. Four PCM/HDPE mixtures were investigated (all percentages by mass): 20/80, 30/70, 40/60, and 50/50. Preliminary findings include differential scanning calorimeter (DSC) measurements of melting temperature and latent heat as well as scanning electron microscope (SEM) pictures of filament composition.

Sign in / Sign up

Export Citation Format

Share Document