Energy absorption performances of silicon carbide particles during microwave heating process

Ke, Cunfeng; Liu, Tao; Zhang, Yaning; Xiong, Qingang

doi:10.1016/j.cep.2022.108796

Cited by 21 publications

(7 citation statements)

References 27 publications

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“…Processing materials using microwave (MW) energy can offer a wide range of advantages [ 1 , 2 , 3 , 4 ] if it is properly implemented, as compared to other processing techniques. In fact, it had been successfully used to process many materials [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ] in different fields recently, such as but not limited to coal, oxide and carbide ceramics, composites, cement and concrete, alloys, fly ash, and even in CO 2 adsorption. Furthermore, MW energy has been used to heat and to sinter metals and their alloys [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ], from the early reported works where MW was used to heat metals to the most recent reported studies where it has been used to join metals and alloys, but its full use needs a comprehensive understanding of MW–material interactions.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Native Oxide Shell of Copper Metal Powder Spherical Particles

Mahmoud

2022

Materials

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The native oxide layer that forms on copper (Cu) metal spherical particle surfaces under ambient handling conditions has been shown to have a significant effect on sintering behavior during microwave heating in a previous study, where an abnormal expansion was observed and characterized during sintering of Cu compacts using reducing gases. Because microwave (MW) heating is selective and depends greatly on the dielectric properties of the materials, this thin oxide layer will absorb MW energy easily and can consequently be heated drastically starting from room temperature until the reduction process occurs. In the current study, this oxide ceramic layer was qualitatively and quantitatively characterized using the carrier gas hot extraction (CGHE) method, Auger electron spectroscopy (AES), and a dual-beam focused ion beam (FIB)/scanning electron microscope (SEM) system that combines both FIB and SEM in one single instrument. Two different commercial gas-atomized spherical Cu metal powders with different particle sizes were investigated, where the average oxygen content of the powders was found to be around 0.575 wt% using the CGHE technique. Furthermore, AES spectra along with depth profile measurements were used to qualitatively characterize this oxide layer, with only a rough quantitative thickness approximation due to method limitations and the electron beam reduction effect. For the dual-beam FIB-SEM system, a platinum (Pt) coating was first deposited on the Cu particle surfaces prior to any characterization in order to protect and to preserve the oxide layer from any possible beam-induced reduction. Subsequently, the Pt-coated Cu particles were then cross-sectioned in the middle in situ using an FIB beam, where SEM micrographs of the resulted fresh sections were characterized at a 36° angle stage tilt with four different detector modes. Quantitative thickness characterization of this native oxide layer was successfully achieved using the adapted dual-beam FIB-SEM setup with more accuracy. Overall, the native Cu oxide layer was found to be inhomogeneous over the particles, and its thickness was strongly dependent on particle size. The thickness ranged from around 22–67 nm for Cu powder with a 10 µm average particle size (APS) and around 850–1050 nm for one with less than 149 µm.

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Section: Introductionmentioning

confidence: 99%

Characterization of the Native Oxide Shell of Copper Metal Powder Spherical Particles

Mahmoud

2022

Materials

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“…1 a; this can be attributed to higher MW power leads to rapid temperature rise. The initial rapid temperature rise was seen in case of 6 mm particle size, 25 g biochar dosing and 1000 W, which may be attributed to low particle size/higher surface area than other particle sizes (8 mm & 10 mm) leading to higher MW irradiation absorption 25 , 27 . For other MW powers (400 W and 700 W), there was an irregular temperature profile showing that a large amount of MW heat dissipated owing to a small sample size (25 g).…”

Section: Resultsmentioning

confidence: 95%

“…The second component comprises energy loss within the cavity itself, primarily influenced by the cavity’s walls and the elements within it. The third component involves the MW energy escaping through the furnace outlet and exhaust hole 25 .…”

Section: Methodsmentioning

confidence: 99%

“…Among all, SiC is the most prominent contenders which have significant properties such as heating performance, dielectric property, good stability at higher temperatures. Ke et al 25 have investigated the heating performance and microwave absorption efficiency of different SiC amounts (20 g-40 g) under MW heating, which means different MW power (300–500 W). It observed that average heating rate obtained as 7.08 °C/s, whereas microwave absorption efficiency was increased from 4.7 to 37.38% at MW power of 300–500 W. It showed that heating rate depends upon the increasing the MW power and SiC dosing.…”

Section: Introductionmentioning

confidence: 99%

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Unveiling the microwave heating performance of biochar as microwave absorber for microwave-assisted pyrolysis technology

Singh,

Lindenberger,

Chawade

et al. 2024

Sci Rep

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Microwave (MW) heating has gained significant attention in food industries and biomass-to-biofuels through pyrolysis over conventional heating. However, constraints for promoting MW heating related to the use of different MW absorbers are still a major concern that needs to be investigated. The present study was conducted to explore the MW heating performance of biochar as a low-cost MW absorber for performing pyrolysis. Experiments were performed on biochar under different biochar dosing (25 g, 37.5 g, 50 g), MW power (400 W, 700 W, 1000 W), and particle sizes (6 mm, 8 mm, 10 mm). Results showed that MW power and biochar dosing significantly impacted average heating rate (AHR) from 17.5 to 65.4 °C/min at 400 W and 1000 W at 50 g. AHR first increased, and then no significant changes were obtained, from 37.5 to 50 g. AHR was examined by full factorial design, with 94.6% fitting actual data with predicted data. The model suggested that the particle size of biochar influenced less on AHR. Furthermore, microwave absorption efficiency and biochar weight loss were investigated, and microwave absorption efficiency decreased as MW power increased, which means 17.16% of microwave absorption efficiency was achieved at 400 W rather than 700 W and 1000 W. Biochar weight loss estimated by employing mass-balance analysis, 2–10.4% change in biochar weight loss was obtained owing to higher heating rates at higher powers and biochar dosing.

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“…The microwave pyrolysis of oil sludge can absorb the microwave using water in it, and rapidly heating it to a higher temperature from the inside [8]. It can also crack heavy hydrocarbons into small molecular compounds, which is considered as the most promising pyrolysis technology [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of nano-metal oxides types on oil sludge during microwave pyrolysis

Chen

Wang

et al. 2023

Matéria (Rio J.)

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In this paper, based on the analysis of oil sludge composition and environmental hazards, the microwave catalytic pyrolysis of oil sludge for recovering combustible gas and chain hydrocarbon light oil disposal process, is proposed to perform the recycling of oil sludge and reduce the risk of environmental pollution. In order to improve the yield of combustible gas and light oil in oil sludge pyrolysis, the impact of adding four catalysts (nano-CuO, nano-NiO, nano-MgO, and nano-γ-Al 2 O 3 ) on the heating characteristics of oil sludge and the composition and quality of products during microwave pyrolysis, were experimentally studied and analyzed. The results show that the catalyst can increase the heating rate of sludge and the yield of pyrolysis oil and gas. The increasing order of heating is: nano-CuO > nano-γ-Al 2 O 3 > nano-MgO > nano-NiO > blank group. Compared with the blank group, the content of combustible gas (H 2 + CH 4 + CO) increases by 18.824wt% (MgO), 4.511wt% (CuO), 9.28wt% (NiO), and 16.164wt% (γ-Al 2 O 3 ), respectively. It can be deduced that nanometal oxide catalysts, especially γ-Al 2 O 3 , can promote the decomposition of oil sludge, improve the content of low carbon straight chain hydrocarbons and alcohols, and improve the quality of pyrolysis oil products.

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Energy absorption performances of silicon carbide particles during microwave heating process

Cited by 21 publications

References 27 publications

Characterization of the Native Oxide Shell of Copper Metal Powder Spherical Particles

Characterization of the Native Oxide Shell of Copper Metal Powder Spherical Particles

Unveiling the microwave heating performance of biochar as microwave absorber for microwave-assisted pyrolysis technology

Effect of nano-metal oxides types on oil sludge during microwave pyrolysis

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