Papers by Keyword: Cleaning

Abstract: The research presents the capabilities of the method of plasma-electrolytic treatment of metal surface that define it as an innovative and resource-saving technology. It is characterized by the synergetic effect of the plasma-electrolytic technology on the surface being treated. The paper shows the effect of different plasma-electrolytic treatment conditions on change of metal physico-chemical and structural-energy properties.

Abstract: In order to ensure adherence of the arc sprayed layer, on the metal substrate, a few specific operations must be performed: initial cleaning, degreasing, roughening, final cleaning and degreasing. At the moment, there are standards which refer to the degree of preparation for processing metal surfaces by spraying. Performing metallic surface preparation operations require compliance with specific health and safety measures and environment protection.

Abstract: Remanufactured parts need to be cleaned before testing and repairing.Molten salt cleaning become a new research focus in remanufacturing cleaning. This paper analyze and research the dirt removal mechanism. This paper analyzes the effect of different salt bath cleaning time and temperature, from the action of heat, comprising a plurality of aspects of surface tension, expansion coefficient and chemical analysis of the role removal mechanism. cleaning effect is researched controlling different conditions in experiments according to the removal mechanism. Experimental results show that the cleaning effect is more obvious, cleaning a relatively short time, ready to meet the requirements of remanufacturing blanks.

Abstract: Classical EPD has typically been conducted in organic solvent media. Many suitable solvents are volatile and highly flammable and this limits the industrial application of the technique on the basis of safety alone. Aqueous EPD may be seen as a safer method, but issues relating to electrolysis and surface energy phenomena become prominent and can create interferences and variability unless the substrate type and its preparation are compatible with the aqueous EPD chemistry and its deposition method. As EPD layers become thinner, factors such as substrate surface structure and wettability become more critical. Industrial processes utilising some principles of EPD for applying paint from water-based preparations are well established in the metal finishing sector. Consequently there is a significant body of practical experience available from this sector that can be of use in translating classical EPD from a solvent to an aqueous technique while avoiding interferences inherent in the use of water as the deposition medium. In this paper, substrate selection is discussed in relation to the electrolyte content of the system where phenomena such as dissolution and micro-arcing can occur. The initial wetting of the substrate must be considered prior to applying voltage. Surface preparation techniques and the methods of introducing the substrate into the EPD dispersion all can have an impact on the final result. Note: This paper is based on the authors’ personal and practical experience of industrial electrophoretic painting over more than 40 years. Only metal substrates are discussed because these have been almost exclusive in this sector during that time. Non-metal substrates such as conductive plastics, graphite and carbon fibre have also been coated with electrophoretic paints but this is not yet at any significant scale and so no general principles have been established

Abstract: The silicon carbide CVD reactor cleaning process was studied by means of detaching silicon carbide particles, which was formed on the silicon carbide coated carbon susceptor surface during the silicon carbide film deposition. The contact points between the particles and the susceptor surface were etched using chlorine trifluoride gas at temperatures lower than 290 °C for 120 min. During this process, the carbon susceptor covered with the silicon carbide coating film suffered from little damage while achieving cleaning.

Abstract: The graphite ore from Australia is a sort of the low-grade and fine-scaled graphite ore. On the basis of the optimum rough grinding fineness, an open and a closed circuit tests were conducted which consist of one rougher, one scavenging, then four-time-regrinding and five-time-cleaning to the rough concentrate, one grinding and scavenging to the mixture of middling1~3, and the middling4~6 returned to the rougher, cleaning1 and cleaning2 respectively. Taking the kerosene, pine oil, lime as flotation reagents, the concentrate with grade improvement from 12.78% to 90.5% was achieved through the routine flotation method, as the flotation recovery rate reached to 92.46%.

Abstract: This article analyzes the problem of recycling of used tires and-retired rubber products, which is of great ecological and economic importance for all developed countries. Nonrenewable natural oil feedstock necessitates the use of secondary resources with maximum efficiency, ie place in the mountains of garbage we could get a new one for our region industry - commercial recycling. This paper presents an overview of methods and technologies for disposal of tires in the world and ways of using waste in the form of dispersed materials.

Abstract: A cleaning process for dyeing apparatus was investigated by employed a self-developed supercritical equipment. The solubility of C.I. Disperse Red 167 was evaluated with acetone, ethanol and carbinol in supercritical carbon dioxide at temperatures of 60, 80,100 and 120 °C and pressures ranging from 12 to 28 MPa. As revealed from the experimental results, the optimal cleaning conditions were as follows: cleaning temperature 100 °C, cleaning pressure 18 MPa, and cleaning time 40 min. Acetone was the most suitable cosolvent and the best cleaning effect was obtained when its concentration was 1%.

Abstract: Interdigitated back contacted (IBC) silicon solar cells have long been shown as high conversion efficiency solar cells, with values as high as 25.0% reported by Sunpower [1]. Such high efficiencies are enabled by the cell structure, with the absence of front side metal shading, which can then be optimised from optical and passivation perspectives. High bulk lifetime silicon and a low series resistance metallisation scheme can also enhance the efficiencies. Other advantages include the easier module incorporation given both metal contacts are located on the rear of the cell.

Abstract: Airborne Molecular Contamination (AMC) concentrations become critical during queue-time (between two successive process steps) when wafers are degassing inside Front Opening Unified Pod (FOUP), a confined environment [1]. In that case, AMC concentrations can reach maximum level.