The Experts below are selected from a list of 33 Experts worldwide ranked by ideXlab platform
Hong-chao Zhang - One of the best experts on this subject based on the ideXlab platform.
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Supercritical carbon dioxide Cleaning of Metal parts for remanufacturing industry
Journal of Cleaner Production, 2015Co-Authors: Mingzheng Li, Tim Short, Xiao-chuan Qing, Yan-ming He, Yan-zeng Li, Heng Zhang, Hong-chao ZhangAbstract:The Cleaning of Metal parts, as stage of a remanufacturing process, should be environmentally benign and it is therefore essential to propose a new Cleaning technology which can reduce or remove environmental contamination. Therefore the research presented in this paper investigates the feasibility of using supercritical carbon dioxide (SC–CO2) as a Cleaning agent, here on a laboratory scale. The effect on the Cleaning performance of different parameters – including Cleaning temperature (65–75 °C); pressure (22.0–25.0 MPa); flow rate of CO2 (4.8–6.8 L/h); Cleaning time (30–40 min); and with or without dehydrated ethyl alcohol as a co-solvent – was examined, using the fractional factorial design of experiments. Based on the experimental data, a second order polynomial model was established to analyse the interaction between distinct variables, which was beneficial in optimising system performance. In addition, degreasing processes of remanufacturing Metal parts were also tested. The experimental results indicated that supercritical carbon dioxide was excellent at decontamination during the remanufacturing Cleaning process, but it was easily affected by variations of the operating parameters. In the tested range, with dehydrated ethyl alcohol as co-solvent, a calculated Cleaning performance index could be up to 89.30% under the temperature 75 °C and pressure 25.0 MPa, respectively. Therefore, it is concluded that supercritical carbon dioxide can be used in the remanufacturing process for removing contamination from the surface of used Metal parts.
Manyalibo J Matthews - One of the best experts on this subject based on the ideXlab platform.
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characterization of laser induced plasmas associated with energetic laser Cleaning of Metal particles on fused silica surfaces
Optics Letters, 2015Co-Authors: Candace D Harris, Nan Shen, Alexander M Rubenchik, Stavros G Demos, Manyalibo J MatthewsAbstract:Time-resolved plasma emission spectroscopy was used to characterize the energy coupling and temperature rise associated with single, 10-ns pulsed laser ablation of Metallic particles bound to transparent substrates. Plasma associated with Fe(I) emission lines originating from steel microspheres was observed to cool from >24,000 to ~15,000 K over ~220 ns as τ(-0.28), consistent with radiative losses and adiabatic gas expansion of a relatively free plasma. Simultaneous emission lines from Si(II) associated with the plasma etching of the SiO(2) substrate were observed yielding higher plasma temperatures, ~35,000 K, relative to the Fe(I) plasma. The difference in species temperatures is consistent with plasma confinement at the microsphere-substrate interface as the particle is ejected, and is directly visualized using pump-probe shadowgraphy as a function of pulsed laser energy.
J C Jiang - One of the best experts on this subject based on the ideXlab platform.
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electrolytic plasma processing for Cleaning and Metal coating of steel surfaces
Surface & Coatings Technology, 2002Co-Authors: E I Meletis, Xueyuan Nie, F L Wang, J C JiangAbstract:Abstract Electrolytic plasma processing (EPP) involves electrolysis and electrical discharge phenomena and it is an emerging, environmentally friendly surface engineering technology. Electrolytic-plasma/material surface interactions during processing can be used for Cleaning of Metal surfaces, formation of diffusion layers and/or deposition of Metal, ceramic and composite coatings. The present work was concerned with Cleaning and deposition of Metal coatings on steel surfaces for corrosion protection. The effects of processing parameters on (i) Cleaning steel surfaces (oxides and contamination); and (ii) Zn and Zn–Al coating deposition were investigated. Surface roughness and oxygen content prior to and after Cleaning were evaluated by profilometry and energy dispersive X-ray analysis (EDAX), respectively. The structure of the EPP cleaned outer surface layer as it evolves after the electrolytic–plasma interaction was studied by high resolution TEM. Morphology, microstructure, composition, adhesion and density of EPP-deposited Zn and Zn–Al coatings on cleaned surfaces were studied as a function of processing parameters. Corrosion properties of the cleaned and coated steels were evaluated by corrosion potential and potentiodynamic polarization measurements. The results show that EPP can effectively produce clean surfaces and also Metal and alloy coatings at high deposition rates, and it has a great potential as a new plasma surface engineering technique.
Mingzheng Li - One of the best experts on this subject based on the ideXlab platform.
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Supercritical carbon dioxide Cleaning of Metal parts for remanufacturing industry
Journal of Cleaner Production, 2015Co-Authors: Mingzheng Li, Tim Short, Xiao-chuan Qing, Yan-ming He, Yan-zeng Li, Heng Zhang, Hong-chao ZhangAbstract:The Cleaning of Metal parts, as stage of a remanufacturing process, should be environmentally benign and it is therefore essential to propose a new Cleaning technology which can reduce or remove environmental contamination. Therefore the research presented in this paper investigates the feasibility of using supercritical carbon dioxide (SC–CO2) as a Cleaning agent, here on a laboratory scale. The effect on the Cleaning performance of different parameters – including Cleaning temperature (65–75 °C); pressure (22.0–25.0 MPa); flow rate of CO2 (4.8–6.8 L/h); Cleaning time (30–40 min); and with or without dehydrated ethyl alcohol as a co-solvent – was examined, using the fractional factorial design of experiments. Based on the experimental data, a second order polynomial model was established to analyse the interaction between distinct variables, which was beneficial in optimising system performance. In addition, degreasing processes of remanufacturing Metal parts were also tested. The experimental results indicated that supercritical carbon dioxide was excellent at decontamination during the remanufacturing Cleaning process, but it was easily affected by variations of the operating parameters. In the tested range, with dehydrated ethyl alcohol as co-solvent, a calculated Cleaning performance index could be up to 89.30% under the temperature 75 °C and pressure 25.0 MPa, respectively. Therefore, it is concluded that supercritical carbon dioxide can be used in the remanufacturing process for removing contamination from the surface of used Metal parts.
Candace D Harris - One of the best experts on this subject based on the ideXlab platform.
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characterization of laser induced plasmas associated with energetic laser Cleaning of Metal particles on fused silica surfaces
Optics Letters, 2015Co-Authors: Candace D Harris, Nan Shen, Alexander M Rubenchik, Stavros G Demos, Manyalibo J MatthewsAbstract:Time-resolved plasma emission spectroscopy was used to characterize the energy coupling and temperature rise associated with single, 10-ns pulsed laser ablation of Metallic particles bound to transparent substrates. Plasma associated with Fe(I) emission lines originating from steel microspheres was observed to cool from >24,000 to ~15,000 K over ~220 ns as τ(-0.28), consistent with radiative losses and adiabatic gas expansion of a relatively free plasma. Simultaneous emission lines from Si(II) associated with the plasma etching of the SiO(2) substrate were observed yielding higher plasma temperatures, ~35,000 K, relative to the Fe(I) plasma. The difference in species temperatures is consistent with plasma confinement at the microsphere-substrate interface as the particle is ejected, and is directly visualized using pump-probe shadowgraphy as a function of pulsed laser energy.