In situ Investigation of Titanium Powder Microwave Sintering by Synchrotron Radiation Computed Tomography

Yu, Xiao; Xu, Feng; Hu, Xiaofang; Li, Yongcun; Li, Wenchao; Dong, Bo

doi:10.3390/met6010009

“…Sub-micrometer-resolution synchrotron X-ray computed tomography has been used by both Xiao et al [5] and Ma et al [6] for in situ investigations of microwave sintering metals. Xiao et al [5] work on titanium powder, which was sintered at 1173 K and data recorded in 900 s time steps. The reconstructed data allows for the extraction of phenomena such as particle densification together with neck formation and growth.…”

Section: Sintering Techniques and Microstructure Evolutionmentioning

confidence: 99%

Metals Challenged by Neutron and Synchrotron Radiation

2018

0

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In the past one and a half decades, neutron and synchrotron radiation techniques have come to the forefront as an excellent set of tools for the wider investigation of material structures and properties, becoming available to a large user community. This holds especially true for metals, which are a fascinating class of materials with both structural and functional applications. With respect to these application classes, metals are used to engineer bridges and automotive engines as well as to exploit magnetic and electric properties in computer storage, optics, and electronics. Both neutron sources and synchrotrons are large user facilities of quantum-beam installations [3] with the implementation of a common accelerator or nuclear reactor-based source, often serving over 50 beamlines simultaneously and even more end stations. Up to a few thousand experiments are undertaken yearly, utilizing specialized beam conditions, sample environments, and detection systems. Their variations range across spectroscopy, diffraction, small-angle scattering, and inelastic scattering for sample sizes ranging from nanometers to meters. Examples of such installations can be found in the Topical Collection Facilities of Metals' sister journal Quantum Beam Science. The scope of the present Special Issue in Metals comprises articles on research case studies on individually selected systems. Fields of interest range from engineering, through materials design, to fundamental materials science, including non-exclusively, strain scanning, texture analysis, phase transformation, precipitation, microstructure reconstruction, crystal defects, atomic structures (both crystalline and amorphous), order and disorder, kinetics, timeresolved microstructure evolution, local structure correlations, phonons, deformation and transformation mechanisms, response to extreme conditions, local and integrated studies, both within the bulk and at interfaces. Regarding the breadth of the discipline, this contribution is not exhaustive by far, but stimulates important and evolving studies throughout the metals community.

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“…Sub-micrometer-resolution synchrotron X-ray computed tomography has been used by both Xiao et al [5] and Ma et al [6] for in situ investigations of microwave sintering metals. Xiao et al [5] work on titanium powder, which was sintered at 1173 K and data recorded in 900 s time steps.…”

Section: Sintering Techniques and Microstructure Evolutionmentioning

confidence: 99%

“…Xiao et al [5] work on titanium powder, which was sintered at 1173 K and data recorded in 900 s time steps. The reconstructed data allows for the extraction of phenomena such as particle densification together with neck formation and growth.…”

Section: Sintering Techniques and Microstructure Evolutionmentioning

confidence: 99%

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Metals Challenged by Neutron and Synchrotron Radiation

Liss

¹

2017

Metals

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“…Microwave energy has become a newly-developing energy source in recent years. Since its first application reported by Roy et al in 1990, microwave heating technology and related equipment have been widely applied in both industrial and small-scale applications, such as the microwave sintering of metal and alloy, and the processing of food, ceramics, composites, biomaterials, chemical and agricultural products [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. Many potential advantages have been recognized in the area of materials processing.…”

Section: Introductionmentioning

confidence: 99%

A Phase-Shifting Method for Improving the Heating Uniformity of Microwave Processing Materials

Liao

¹

,

Lan

²

,

Zhang

³

et al. 2016

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Microwave processing of materials has been found to deliver enormous advantages over conventional processing methods in terms of mechanical and physical properties of the materials. However, the non-uniform temperature distribution is the key problem of microwave processing, which is related to the structure of the cavity, and the placement and physical parameters of the material. In this paper, a new microwave cavity structure with a sliding short based on phase-shifting heating is creatively proposed to improve the temperature uniformity. An electronic mathematical model based on the Finite Element Method (FEM) is built to predict the temperature distribution. Meanwhile, a new computational approach based on the theory of transformation optics is first provided to solve the problem of the moving boundary in the model simulation. At first, the experiment is carried out to validate the model, and heating results from the experiment show good agreement with the model’s prediction. Based on the verified model, materials selected among a wide range of dielectric constants are treated by stationary heating and phase-shifting heating. The coefficient of variation (COV) of the temperature and temperature difference has been compared in detail between stationary heating and phase-shifting heating. A significant improvement in heating uniformity can be seen from the temperature distribution for most of the materials. Furthermore, three other materials are also treated at high temperature and the heating uniformity is also improved. Briefly, the strategy of phase-shifting heating plays a significant role in solve the problem of non-uniform heating in microwave-based material processing. A 25%–58% increase in uniformity from adapting the phase-shifting method can be observed for the microwave-processed materials.

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In situ Investigation of Titanium Powder Microwave Sintering by Synchrotron Radiation Computed Tomography

Cited by 15 publications

References 15 publications

Metals Challenged by Neutron and Synchrotron Radiation

Metals Challenged by Neutron and Synchrotron Radiation

Metals Challenged by Neutron and Synchrotron Radiation

A Phase-Shifting Method for Improving the Heating Uniformity of Microwave Processing Materials

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