Effect of magnetic field waveform on microstructure and properties of laser cladding

Chen, Zixin; Zhou, Houming; Li, Mingfu; Zhang, Gaofeng; Xu, Caixing; He, Fangjia

doi:10.1016/j.mlblux.2021.100084

Cited by 6 publications

(6 citation statements)

References 10 publications

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“…After a long period of geological changes, many fissures in coal reservoirs are blocked by many minerals, such as quartz, kaolinite, calcite, hematite, chlorite, and so on. The principle diagram of coal reservoir acidizing and penetration enhancement is shown in Figure 5 40 …”

Section: Resultsmentioning

confidence: 99%

Research on how acidification affects the coal's microscopic pore structure in the Guizhou mining region

He,

Li,

Xue

et al. 2023

Energy Science & Engineering

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By eliminating their minerals, acidification technology makes coal seams more permeable. Acidification technology were conducted in the Farr and Qinglong mining areas using a mixed acid solution to study the impact of acidification technology on increasing the permeability of primary structural coals in the Guizhou region, China. The microphysical and chemical structure of the coal samples before and after acidification transformation was compared using X‐ray diffraction, scanning electron microscope, mercury intrusion porosimetry, and Fourier transform infrared spectrometry experiments. The results show that after acidification, the volatile matter content is reduced by 4.2% and 16.25%, the carbon content is increased, the degree of coalification is deepened, the gas content of the coal seam is elevated, and the gas source is more abundant. The minerals on the surface are dissolved to different degrees, and the pores and cracks are dredged, so that the surface of the coal samples shows better connectivity, which is conducive to the diffusion and transport of coalbed methane. The volume and pore diameter of the macropore and mesopore in the Farr coal samples were improved after acidification, and the fractal structure was more prominent, the pore connectivity was good, and the pore diameter of the Qinglong coal samples was greatly increased. The content of oxygen‐containing functional groups increased by 11.2% and 2.1%, respectively, which is conducive to the desorption of coalbed methane after acidification, and with the increasing degree of metamorphism of the coal samples, the higher the content of oxygen‐containing functional groups was and the less pronounced the effect of acidification. Acidification technology can effectively remove the minerals in the coal body and has a good effect on penetration enhancement, and the results of the study can provide certain theoretical references for the penetration enhancement of coal seams in Guizhou mining areas.

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Section: Resultsmentioning

confidence: 99%

Research on how acidification affects the coal's microscopic pore structure in the Guizhou mining region

He,

Li,

Xue

et al. 2023

Energy Science & Engineering

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“…With growing magnetic field intensity, the WC content in the middle of the coating becomes higher, and the carbide hard phase precipitated in the middle of the coating increases. Furthermore, with the increase in magnetic field intensity, the carbide hard phase is “broken”, forming more and smaller carbide hard phases, and the average microhardness increases to realize dispersion strengthening [ 23 ]. Figure 5 b shows that coating hardness decreases sharply in the area 1.3~1.7 mm away from the coating surface, because coarse dendrites are mainly concentrated at the bottom of the coating and feature low hardness.…”

Section: Resultsmentioning

confidence: 99%

Study on Microstructure and Properties of Ni60A/WC Composite Coating by Alternating-Magnetic-Field-Assisted Laser Cladding

et al. 2022

Self Cite

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Ni60A/WC composite coating is prepared on 45 steel substrate by alternating-magnetic-field-assisted laser cladding. We compare the effects of different magnetic field intensity on WC particle distribution, microstructure, phase composition, microhardness and wear; in addition, the mechanism of alternating magnetic fields on cladding layers is briefly analyzed. The results show that an alternating magnetic field can significantly homogenize the distribution of WC particles. WC particles at the bottom are stirred and dispersed to the middle and upper area of the laser pool. The distribution of WC in the bottom region 6 of the coating decreases from 19.1% to 10%, the distribution of WC in the bottom region 5 decreases from 46.46% to 33.3%, the WC distribution in the top region 1 of the coating increases from 0 to 7.7% and the WC distribution in the top region 2 of the coating increases from 8.08% to 12.2%. The stirring of alternating magnetic fields strengthens the solute convection in the laser pool, refines the snowflake-shaped carbide hard phase and improves the coating microhardness and wear property, and adhesive wear and abrasive wear decrease gradually with increasing magnetic field strength.

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“…To improve the friction performance of graphene, graphene-based nanocomposites were prepared by loading nanoparticles on the surface of graphene with excellent friction reduction and antiwear properties, which can reduce the secondary agglomeration of graphene lamellae, thus having better friction performance than graphene single agents. However, conventional preparation methods are difficult to ensure the dispersion of the nanoparticles for the loading nanoparticles dispersed on the surface of graphene (Hong et al , 2019; Qiao et al , 2015; Tu et al , 2020; Kim et al , 2013; Padgurskas et al , 2013).…”

Section: Introductionmentioning

confidence: 99%

Tribological properties of lyophilized graphene loading nano-copper as lubricating oil additive

Peng

Liu

Wang

et al. 2023

ILT

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Purpose This study aims to investigate the synergistic friction reduction and antiwear effects of lyophilized graphene loading nano-copper (RGO/Cu) as lubricating oil additives, compared with graphene. Design/methodology/approach The friction performance of freeze-drying graphene (RGO) and RGO/Cu particles was investigated at different addition concentrations and under different conditions. Findings Graphene plays a synergistic friction reduction and antiwear effect because of its large specific surface area, surface folds and loading capacity on the nanoparticles. The results showed that the average friction coefficients of RGO and RGO/Cu particles were 22.9% and 6.1% lower than that of base oil and RGO oil, respectively. In addition, the widths of wear scars were 62.3% and 55.3% lower than those of RGO/Cu particles, respectively. Originality/value The RGO single agent is suitable for medium-load and high-speed conditions, while the RGO/Cu particles can perform better in the conditions of heavy load and high speed.

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Effect of magnetic field waveform on microstructure and properties of laser cladding

Cited by 6 publications

References 10 publications

Research on how acidification affects the coal's microscopic pore structure in the Guizhou mining region

Research on how acidification affects the coal's microscopic pore structure in the Guizhou mining region

Study on Microstructure and Properties of Ni60A/WC Composite Coating by Alternating-Magnetic-Field-Assisted Laser Cladding

Tribological properties of lyophilized graphene loading nano-copper as lubricating oil additive

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