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Статті в журналах з теми "Slurry spray"
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R. Verma, R. Verma, S. Kumar S. Kumar, N. M. Suri N. M. Suri, and S. Kant S. Kant. "Optimization of Mullite Based Coating Using Slurry Spray Technique." International Journal of Scientific Research 2, no. 8 (June 1, 2012): 166–69. http://dx.doi.org/10.15373/22778179/aug2013/56.
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Wei, Xiao Hua, Hong Xing Zhang, Lan Zhu Ren, and Yang Fang. "The Atomizing Experimental Study of the Refined Oil-Water Coal Slurry on the Diesel Engine of the Large-Scale Ship." Advanced Materials Research 152-153 (October 2010): 1822–25. http://dx.doi.org/10.4028/www.scientific.net/amr.152-153.1822.
Повний текст джерелаАнотація:
At present almost all low-speed diesel engines burn heavy fuel oil or low-quality fuel oil, the viscosity, low calorific value and impurities are similar as oil-water coal slurry, so, oil-water coal slurry is possible as the fuel of large marine diesel. This article has carried on the description about atomized characteristic of oil-water slurry, and it’s atomizing performance and analysis to the nozzle of type ZCK154S432 and type ZCK154S423 is studied experimentally from different spurting pressure, the different spray nozzle type as well as the different density of refined oil-water slurry, obtained the main factors of affect oil-water slurry’s atomization, illustrated the importance of developing coal instead of oil.
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Spencer, Nicholas D., Thorvald S. Peders, and Matthew B. Baer. "Processing tetramethylammonium-carbonate-coprecipitated slurries to obtain small-particle-size YBa2Cu3O7." Journal of Materials Research 6, no. 2 (February 1991): 220–26. http://dx.doi.org/10.1557/jmr.1991.0220.
Повний текст джерелаАнотація:
The effect of different drying and calcination methods on the ultimate particle size of YBa2Cu3O7 (Y-123) has been investigated. The starting material was a tetramethylammonium (TMA) carbonate-precipitated slurry. Spray-drying the slurry after filtering and reslurrying (to remove residual TMA) was most effective in the ultimate formation of finely divided Y-123. The morphology of the spray-dried powder could be preserved by calcining in very low total pressures of flowing oxygen. When a slurry with 0.16% solids content was spray dried, and this powder calcined at 750 °C in 2 Torr of flowing oxygen, a Y-123 powder of mean particle size 0.74 μm (66% submicron) was obtained.
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Indacochea, J. Ernesto, Ira Bloom, Michael Krumpelt, and Thomas G. Benjamin. "A comparison of two aluminizing methods for corrosion protection in the wet seal of molten carbonate fuel cells." Journal of Materials Research 13, no. 7 (July 1998): 1834–39. http://dx.doi.org/10.1557/jmr.1998.0260.
Повний текст джерелаАнотація:
The corrosion behavior of aluminized Type 310S stainless steel (SS) in the wet seal of molten carbonate fuel cells was investigated. Coupons of Type 310S SS were aluminized by two different aluminizing methods: thermal spray and slurry-coating. In both types of samples Fe and Cr diffused readily into the Al layer at 650 °C. At first this interdiffusion is limited to the interfacial area. With time, Fe and Cr aluminides precipitate in the Al layer. The slurry-coated layer contains a higher concentration of FeAl and Fe3Al than does the thermal spray layer. Consequently, the slurry-coated layer also displays a greater degree of corrosion than the thermal spray layer.
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Seshadri, A. K., J. A. Caton, and K. D. Kihm. "Coal-Water Slurry Spray Characteristics of a Positive Displacement Fuel Injection System." Journal of Engineering for Gas Turbines and Power 114, no. 3 (July 1, 1992): 528–33. http://dx.doi.org/10.1115/1.2906621.
Повний текст джерелаАнотація:
Experiments have been completed to characterize coal-water slurry sprays from a modified positive displacement fuel injection system of a diesel engine. The injection system includes an injection jerk pump driven by an electric motor, a specially designed diaphragm to separate the abrasive coal from the pump, and a single-hole fuel nozzle. The sprays were injected into a pressurized chamber equipped with windows. High speed movies and instantaneous fuel line pressures were obtained. For injection pressures of order 30 MPa or higher, the sprays were similar for coal-water slurry, diesel fuel, and water. The time until the center core of the spray broke up (break-up time) was determined both from the movies and from a model using the fuel line pressures. Results from these two independent procedures were in good agreement. For the base conditions, the break-up time was 0.58 and 0.50 ms for coal-water slurry and diesel fuel, respectively. The break-up times increased with increasing nozzle orifice size and with decreasing chamber density. The break-up time was not a function of coal loading for coal loadings up to 53 percent. Cone angles of the sprays were dependent on the operating conditions and fluid, as well as on the time and location of the measurement. For one set of cases studied, the time-averaged cone angle was 15.9 and 16.3 deg for coal-water slurry and diesel fuel, respectively.
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Gvozdyakov, D. V., A. V. Zenkov, V. E. Gubin, A. Zh Kaltaev, and Ya V. Marysheva. "Experimental studies into the effect of air pressure on the atomization characteristics of coal-water slurries." iPolytech Journal 25, no. 5 (November 9, 2021): 586–600. http://dx.doi.org/10.21285/1814-3520-2021-5-586-600.
Повний текст джерелаАнотація:
The paper studies the effect of atomizing agent pressure on the spray characteristics after spraying coal-water slurry that contains small additives of liquid waste from the pyrolysis of industrial rubber goods and used engine oil. The conducted experiments used automobile tires as the indicated rubber products; spraying was carried out employing an internal mixing pneumatic atomizer. Following the atomization of considered fuels, droplet size changes were studied using the interferometric particle imaging (IPI) technique. The spray angle was determined by means of a Photron high-speed camera. In addition, coal-water slurry containing liquid waste from the pyrolysis of industrial rubber goods and used engine oil (3–12 wt%) was sprayed to study the effect of atomizing agent pressure on the spray characteristics. A decrease in air pressure was found to reduce the spray angle by less than 6%, which resulted in the formation of rather large droplets exceeding 600 µm in size. It is experimentally confirmed that more fine droplets are formed at similar fuel and air pressures when using a spraying device equipped with an internal mixing chamber for slurry and air. The number of droplets, in this case, is 2–9% higher as compared to a typical two-component coal-water slurry fuel, with the spray angle of the sprayed coal slurry having the greatest value. When using an atomizer having an internal mixing chamber for slurry and an atomizing agent, fuel droplet breakup occurs due to the aerodynamic drag forces of the environment. Thus, the use of such atomizers reduces the number of possible breakup mechanisms for sprayed fuel droplets.
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Chiangka, Saowaluk, Sukasem Watcharamaisakul, and Boris Golman. "Effect of Slurry Formulation on Morphology and Flowability of Spray-Dried Alumina/Zirconia Composite Particles." Key Engineering Materials 675-676 (January 2016): 531–34. http://dx.doi.org/10.4028/www.scientific.net/kem.675-676.531.
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Alumina/zirconia composite materials are widely used for biomedical applications because of their high biocompatibility and good mechanical properties. In this work, the effects of slurry solid content and binder type are studied on the characteristics of spray-dried composite particles. The tap density and particle size of composite particles increase while the compressibility index decreases with increasing solid content of slurry. An analysis of the SEM micrographs of spray-dried particles confirms the formation of dense composite particles of round shape without internal holes with 70 wt.% slurry using PVA+PEG co-binder.
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Goyal, D. K., H. Singh, and H. Kumar. "An overview of slurry erosion control by the application of high velocity oxy fuel sprayed coatings." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 225, no. 11 (September 19, 2011): 1092–105. http://dx.doi.org/10.1177/1350650111412443.
Повний текст джерелаАнотація:
Slurry erosion of turbine components is a serious problem in most of the hydraulic power plants all around the world. Although some counter measures such as catchment area treatment to reduce the amount of sand particles going through the turbine components and modifying the hydraulic shape of turbine to reduce slurry erosion have been taken, still slurry erosion is responsible for heavy economic losses. Research is also in progress for improving the surface properties of the turbine components by the application of thermal sprayed coatings. Among various thermal spray processes, high-velocity oxy fuel (HVOF) spray process is a relatively industrially established and economical process. In this paper, an attempt has been made to describe HVOF thermal spray technology. Further, this paper presents a tutorial introduction, comprehensive history, and review of research work done on the use of this technique to provide protection against slurry erosion of some metals and alloys with a special emphasis on the hydraulic turbine steels.
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Siebers, D. L., and T. M. Dyer. "The Autoignition and Combustion of Coal-Water Slurry Under Simulated Diesel Engine Conditions." Journal of Engineering for Gas Turbines and Power 108, no. 4 (October 1, 1986): 654–60. http://dx.doi.org/10.1115/1.3239961.
Повний текст джерелаАнотація:
The combustion characteristics of a coal-water slurry spray were examined under diesel engine conditions. A two-stage combustion process was used to simulate the diesel engine conditions in a constant-volume combustion bomb. The combustion characteristics investigated were ignition delay, ignition site, combustion development, combustion duration, and combustion completeness. The results show that the ignition delay of the coal-water slurry fuel is temperature and pressure dependent. Also, the coal slurry ignition delay is approximately a factor of five longer and the energy release rate is significantly slower in comparison to the ignition delay and energy release rate for conventional No. 2 diesel fuel. The combustion of the slurry spray was incomplete for all test conditions due to the impingement and the adherence of the coal slurry on the wall. This fundamental testing provides insight into engine design parameters which must be considered if coal-water slurry is to be used in practice.
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Cheng, Xiao Su, Meng Qi Peng, and Yu Fa Zhong. "Process Factors Using Centrifugal Spray Drying to Prepare Bauxite Microspheres." Advanced Materials Research 399-401 (November 2011): 828–33. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.828.
Повний текст джерелаАнотація:
The centrifugal spray drying process of bauxite slurry was studied to investigate the influence of slurry solid content on the particle size distribution and the sphericity of the microspheres, and so was operation technology on average diameter and the sphericity of the microspheres. The optimal operation parameters are obtained to prepare high spherical microspheres bauxite with the diameter distribution of 100 μm and whose particle size distribution is narrow: the slurry solid content is 70 wt%, the dry air temperature is 250 °C, the rotation rate of spray head is 6000 rpm and the feed flow rate is 1 L/h in the experiments.
Дисертації з теми "Slurry spray"
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Carreto, Vazquez Victor Hugo. "Spray drying and attrition behavior of iron catalysts for slurry phase Fischer-Tropsch synthesis." Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/1138.
Повний текст джерелаАнотація:
This thesis describes results of a study aimed at developing and evaluating attrition resistant iron catalysts prepared by spray drying technique. These catalysts are intended for Fischer-Tropsch (F-T) synthesis in a slurry bubble column reactor (SBCR). One of the major challenges associated with the use of SBCR for this purpose is the problem of catalyst/wax separation. If the catalyst particles break up into smaller ones during the F-T synthesis, these small particles (>5-10 m in diameter) will cause problems with the catalyst/wax separation. Several research groups have worked on development of attrition resistant spray-dried iron catalysts, and methodology to measure and predict their attrition behavior. However, these attrition tests were not conducted under conditions representative of those encountered in a SBCR.
In this work, the attrition behavior of six spray-dried catalysts and two precipitated catalysts was evaluated under slurry reaction conditions in a stirred tank slurry reactor (STSR). Spray-dried catalysts used in this study were prepared at Texas A&M University (TAMU) and at Hampton University (HU), employing different preparation procedures and silica sources (potassium silicate, tetraethyl orthosilicate or colloidal silica). The attrition properties of F-T catalysts were determined by measuring particle size distribution (PSD) of catalysts before and after F-T synthesis in the STSR. This provides a direct measure of changes in particle size distribution in the STSR, and accounts for both physical and chemical attrition effects. Also, scanning electron microscopy (SEM) was used to investigate the mechanism of attrition - erosion vs. fracture, and to obtain morphological characteristics of catalysts. Spray dried 100Fe/3Cu/5K/16SiO2 catalyst (WCS3516-1), prepared from wet precursors using colloidal silica as the silica source, was the best in terms of its attrition strength. After 337 hours of F-T synthesis in the STSR, the reduction in the average particle size and generation of particles less than 10 m in diameter were found to be very small. This indicates that both particle fracture and erosion were insignificant during testing in the STSR. All other catalysts, except one of the spray dried catalysts synthesized at Hampton University, also had a good attrition resistance and would be suitable for use in slurry reactors for F-T synthesis.
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Patankar, Isha Anirudha. "Influence of slurry viscosity on cemented carbide powder properties." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-286893.
Повний текст джерелаАнотація:
Cemented carbide powder production is the first step in the manufacturing of cemented carbide inserts.The quality of the powder affects the successive process steps in the production of the cemented carbide inserts. The powder is produced by spray drying of a slurry. The slurry consists of polymer, water, ethanol, and dry components. The operating conditions of the spray dryer have been studied greatly to optimize the powder properties but less is known about the influence of the slurry on the powder. This work examines the effect of slurry composition on the cemented carbide powder properties. The work is necessary to predict optimum slurry composition to produce good quality cemented carbide powders. To characterise the powders, flowability, density, particle morphology and hollowness of the powder granules were measured for different slurry compositions. No direct correlation was observed between slurry viscosity and the powder properties but a change in the amount of raw material and organic additives in the slurry affected various powder properties. An optimum slurry composition was obtained which can produce better quality of cemented carbide powder. Additionally, it was found that an increase in slurry viscosity can hinder the spray drying process.Tillverkning av hårdmetallpulver är det första steget i tillverkningen av hårdmetallinsatser. Pulverkvaliteten påverkar de successiva processstegen vid tillverkningen av hårdmetallinsatserna. Pulvret framställs genom spraytorkning av en uppslamning. Uppslamning består av polymer, vatten, etanol och torra komponenter. Driftförhållandena för spraytork har studerats mycket för att optimera pulveregenskaperna, men mindre är känt om påverkan av uppslamningen på pulvret. Detta arbete undersöker effekten av uppslamningskomposition på egenskaperna för hårdmetallpulver. Arbetet är nödvändigt för att förutsäga optimal uppslamningskomposition för att producera hårdmetallpulver av god kvalitet. För att karakterisera pulvren mättes flytbarhet, densitet, partikelmorfologi och hålighet hos pulvergranulerna för olika uppslamningskompositioner. Ingen direkt korrelation observerades mellan uppslamningsviskositet och pulveregenskaperna men en förändring i mängden råmaterial och organiska tillsatser i uppslamningen påverkade olika pulveregenskaper. En optimal uppslamningskomposition erhölls som kan ge bättre kvalitet på hårdmetallpulver. Dessutom fann man att en ökning av uppslamningsviskositeten kan hindra spraytorkningsprocessen.
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Farshchi, Amin. "The influence of slurry formulation on the multi-scale structure and functional properties of spray dried detergent powders." Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/21912/.
Повний текст джерелаАнотація:
Globally, spray drying is the most commonly used process by which detergent slurries can be transformed into low-density and free-flowing powders. The structure and formulation of these granules have a profound effect on the functional properties, e.g. flow behaviour, storage stability and dissolution rate, of the final product. Nevertheless, little is known about the structure and functional properties of the spray-dried powders due to the lack of scientific works in the public domain. In this thesis, four simple model formulations based on linear alkyl benzene sulphonate (NaLAS) and sodium sulphate were used to probe the influence of initial slurry water content and binder, SiO2:Na2O molar ratio of sodium silicate, on the structure. Moreover, flow behaviour and water sorption characteristics were chosen to be investigated as the findings of these studied can provide a better understanding of the influence of slurry formulation on the granule structure. The complex multiscale structure of these granules was characterized using a complementary range of techniques including scanning electron microscopy (SEM), image analysis, x-ray micro-tomography, wide angle and small angle x-ray scattering (WAXS, SAXS). A complex composite structure is revealed due to the multiphase nature of the starting slurry and its evolution during the drying process. The structure revealed can be viewed as a continuous matrix consisting of NaLAS, sodium sulphate and binder in which large, dense, crystals of sodium sulphate are embedded. These were initially undissolved in the slurry and are consequently reduced in number in the product made from higher water content slurry. Air is also dispersed in this matrix at two length scales, large vacuoles, at sizes of the order of the particle diameter which are the result of ‘puffing’ i.e. water boiling, and micro-scale porosity which evolved during the crystallisation of the drying matrix. The matrix is a composite structure of binder, dried surfactant liquid crystalline phase and sub-micron scale crystallites of sodium sulphate. Changes in the initial composition, water content or binder, of this phase are seen to change both the sulphate polymorphs present and the d-spacing of the NaLAS phase. Morphology and surface characteristics are also seen to change with the high initial moisture content particles producing more irregular structure and a rougher surface. The SAXS data were further analysed by reconstructing electron density profiles (EDP) of the one-dimensional repeat of bilayer stacking by Fourier analysis, and the parameters of lamellar d-spacing, bilayer thickness (dHH ) and water layer thickness (dW ) were determined. The relative humidity was found to be a critical factor determining the number of coexisting lamellar polymorphs. The greater the RH value, the fewer is the number of lamellar polymorphs. The presence of binders is another factor, due to its hygroscopic properties, controlling the short-range order structures of self-assembled surfactants. To investigate the influence of relative humidity on the microstructural evolution and moisture sorption behaviour of spray-dried detergent powders, the samples were stored at various relative humidity. The moisture sorption isotherms of the powders were gravimetrically determined using a dynamic vapour sorption (DVS) technique. The extent of moisture uptake in these samples was found to be determined by the solid state of sodium silicate. The powder flowability was investigated using a Schulze ring shear tester. The initial water content of the slurries was found to have a profound effect on the flowability of the resulting spray-dried powders. The powders produced from high-water content showed a better flow behaviour. This was attributed to the influence of water content on the matrix composition. The chemical composition of the detergent powders was also probed using Raman confocal microscopy techniques. The powders containing lower surface concentration of surfactant had a better flowability. Sodium silicates significantly improved the flow behaviour of the particles. The silicate is thought to form a glassy continuum linking sulphate crystals and surfactant domains, which consequently increases the apparent granule strength, and hence improves the flow behaviour.
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Nguyen, Phuc. "Slurry sprayed thermal barrier coatings for aerospace applications." Thesis, 2010. http://hdl.handle.net/2440/63483.
Повний текст джерелаАнотація:
Thermal Barrier Coatings (TBCs) were introduced to reduce operating temperatures and thermal stresses in structures and machine components across a wide range of industries and applications more than 40 years ago, and within the last 15 years their use in various high temperature applications has increased dramatically. These include the aeronautical, aerospace, automotive and nuclear industries and heavyduty utilities such as diesel trucks.
The research and development of TBCs were centred on ceramic coatings possessing a relatively low thermal conductivity which is critically important for the thermal protection of load bearing structures. There are many manufacturing techniques for depositing ceramics coatings on a metallic substrate. Many of these techniques are very expensive and often inapplicable to coat large or curved surfaces. In this work a new, relatively simple and low cost method of manufacturing TBCs, the Slurry Spray Technique (SST), was developed by the candidate with a focus on aerospace applications. The challenge in the development of this technique was to achieve the coating quality comparable to the quality of the coating manufactured with the existing manufacturing techniques.
The research began with the Wet Powder Spray (WPS), a promising and cost effective technique for fabricating TBCs, which was adopted by the candidate. However TBCs fabricated with this technique normally have an extremely low quality in comparison to the existing fabricating techniques, such as Electron Beam Physical Vapour Deposition or Atmospheric Plasma Spray. Through the analysis and examination of the individual fabricating stages of the WPS method, a new technique, Slurry Spray Technique (SST), was developed by the candidate and investigated. In particular, it was demonstrated that the TBC fabricated with SST have higher quality, strength and reliability than coatings fabricated with the WPS technique. The quality of TBCs achieved in this work is approaching to the quality of the thermal coating fabricated with commercially available manufacturing methods. The main advantages of the new technique are the low costs and ability to cover large and curved areas, which are critical for a number of important practical applications. This technique also allows the fabrication of multi-layered graded coatings, which were demonstrated to have a significantly improved performance in scale tests under conditions similar to a hypersonic flight than single layered coatings.
The scale and virtual testings conducted with the help of the finite element modelling provided the confidence that with the future development of this technique it can be effectively utilised in numerous practical applications, specifically in the aerospace industry.Thesis (Ph.D.) -- University of Adelaide, School of Mechanical Engineering, 2010
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Hwang, Tzuen-Yuh, and 黃尊裕. "The Study of Spray Drying Flue Gas Desulfurization : The Efficiency of Limestone Slurry." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/48921373591425808204.
Повний текст джерелаАнотація:
碩士國立臺灣大學
化學工程學系研究所
86
The spray-drying flue gas desulfurization process using finely groun d limestone slurry has been investigated. The SO2 removal efficiency increased with the increasing limestone surface area and leveled off after the surface area being greater than 11 m2/g. The SO2 removal efficiency of limestone (14.2 1 m2/g) slurryXe lower than that of lime (14.49 m2/g) slurry, and the diffe rence was about 5% as the Ca/S molar ratio was greater than 1.5.(61℃,73%RH). The SO2 removal efficiency of limestone s increased dramatically with increasi ng relative humidity, slightly increased with increasing NOx concentration , a nd slightly decreased with increasing CO2 concentration. Under the conditions of the typical flue gas composition, 61℃, 73%RH, and Ca/S molar ratio =1, th e total SO2 removal efficiency was 58%. The addition of fly ash into limestone slurry had positive effect on the SO2 removal, At constant Ca/S molar ratio, the SO2 removal efficiency of limestone or fly ash/limestone slurry decreased as Sncentration decreased.
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Wang, Jun-Hong, and 王駿宏. "Spray coating of CaCO3/Ca3(SiO4)O slurry containing SiO2/modified desulfurization slag on AZ91D Mg alloy for improving the corrosion performance and the heat resistance of the alloy." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/91507866886936251391.
Повний текст джерелаАнотація:
碩士國立中興大學
材料科學與工程學系所
103
In this study, CaCO3/Ca3(SiO4)O slurry containing different weight ratio of SiO2 and modified desulfurization slag, sprayed coating on AZ91D for improving the corrosion performance and the heat resistance of the alloy. The result of experiment show the corrosion performance of the spray-coated AZ91D is improved with increasing SiO2 content added into cement slurry. When the spray coating containing >12 wt.% SiO2, the corrosion performance of the spray-coated AZ91D is not enhanced and C-S-H (CaO-SiO2-H2O) gel is hindered self-repair. In addition, when 30 wt.% modified desulfurization slag added into containing 12 wt.%SiO2 cement slurry spray coating on AZ91D (C+12S+30M@AZ91D), the corrosion current density of the spray-coated AZ91D was decreased from 198 μAcm-2 (AZ91D) to 14.61 μAcm-2. The anti-salt spray time of C+12S+30M@AZ91D is improved to 144 hour. The corrosion resistance ability has elevated the phenomenon. After 48 hour of salt spray test, the C+12S+30M@AZ91D surface can be found the forming of CaO-CaCO3 dense layer. In heat resistance properties, the C+12S+30M@AZ91D surface on the coatedside was heated to 500 ℃, the tensile strength of C+12S+30M@AZ91D can be maintained at 204 MPa. The ignition temperature of C+12S+30M@AZ91D is increased from 580 ℃ (AZ91D) to 650 ℃. The time to onset burning at 735 ℃ of C+12S+30M@AZ91D can be increased from 45 second (AZ91D) to 89 second. The spray-coated AZ91D, the coating materials containing the 12 wt.% SiO2 cement slurry added with 30 wt.% modified desulfurization slag, can improve the corrosion performance and the heat resistance of AZ91D. After spray-coated on AZ91D, the density rising of the spray-coated AZ91D was maintained at <5 %.
Книги з теми "Slurry spray"
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Masnyk, Marek. Sprawy polskie w wyborach parlamentarnych na terenie rejencji opolskiej w swietle raportow polskiej sluzby dyplomatycznej i konsularnej (1924-1933). Opole: Wydawnictwo Uniwersytetu Opolskiego, 2004.
Знайти повний текст джерелаЧастини книг з теми "Slurry spray"
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Doğu, Gülşen, Gökhan Ölmez, and Timur Doğu. "Removal of SO2 with Lime Slurry in a Spray Dryer." In Chemical Reactor Technology for Environmentally Safe Reactors and Products, 499–505. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2747-9_20.
Повний текст джерела
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"Metal Slurry Droplet and Spray Combustion." In Advances in Combustion Science: In Honor of Ya. B. Zel'dovich, 117–30. Reston ,VA: American Institute of Aeronautics and Astronautics, 1997. http://dx.doi.org/10.2514/5.9781600866456.0117.0130.
Повний текст джерела
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Verma, Rajeev, Narendra Mohan Suri, and Suman Kant. "Slurry Sprayed Mullite Coatings and Their Corrosion Performances." In Production, Properties, and Applications of High Temperature Coatings, 187–214. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-4194-3.ch008.
Повний текст джерелаАнотація:
Slurry spray technique (SST) is a distinctive variant among the numerous and already established coating techniques. Functionally graded thermal barrier and environmental barrier coating have been the functionalities developed so far for the process. Among the choice of the various ceramic feedstocks available mullite and partially stabilized zircona have been found suitable and investigated for the coating deposition via SST. This chapter reports the findings of the corrosion studies in simulated industrial corrosive environments and characterization results of the six sets of slurry sprayed mulite-nickel based coatings. Decent protection against coating has been found during the immersion test performed on these coatings for evaluating their corrosion performance. The developed coatings are recommended for use in applications to endure the elevated temperature and inflict corrosion. Thermal cycling test was performed to support the acceptable thermal shock resistance and coating compliance of the developed coatings.
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LEE, GIL-YONG, JONG-HEE KIM, SUNG-NAM RYOO, DONG-HYUN PECK, DOO-HWAN JUNG, YONG-GUN SHUL, DONG-RYUL SHIN, and RAK-HYUN SONG. "STUDY ON CERAMIC INTERCONNECT MANUFACTURED BY SLURRY DIP COATING AND PLASMA SPRAY COATING PROCESSES." In Solid State Ionics, 261–69. WORLD SCIENTIFIC, 2004. http://dx.doi.org/10.1142/9789812702586_0027.
Повний текст джерелаТези доповідей конференцій з теми "Slurry spray"
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Keller, N., G. Bertrand, B. Comas, and C. Coddet. "On the Tailoring of Spray Dried Thermal Spray Powders." In ITSC2001, edited by Christopher C. Berndt, Khiam A. Khor, and Erich F. Lugscheider. ASM International, 2001. http://dx.doi.org/10.31399/asm.cp.itsc2001p0285.
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Abstract In thermal spray, it is well established that tailoring the powder characteristics is of major importance to achieve reproducible coatings on a microstructural and chemical point of view. Among the techniques developed to produce thermal spray powders, spray drying has proved to be the most versatile process. The spray drying method consists in spraying a slurry containing finely dispersed particles of the materials to be agglomerated. However, in order to prepare specific thermal spray powders, two steps have to be mastered: the slurry stability and the spray drying operating conditions. The present study was focused on the relationships that exist between the slurry rheology, the powder morphology and the coating properties. This work was performed on a model material namely Al2O3. In a first part, the effects of the surfactant percentage and pH on the stability of the suspensions were determined. The evolution of the viscosity of the slurries versus the amount of binder was measured. In a second part, these slurries were used to prepare spray-dried powders. The effects of some process parameters such as atomizing air pressure and slurry feed rate on the granule characteristics (morphology, density, particle size distribution, and powder flow ability) were investigated. Finally, some coatings were deposited using the APS technique on steel substrates from the non-sintered spray-dried powder previously realized. The coating morphology and the crystallographic structure were evaluated as a function of the spraying conditions.
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Son, S. Y., and K. D. Kihm. "Effect of Coal Particle Size on Coal-Water Slurry (CWS) Atomization." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0885.
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Abstract The effect of coal particle size on coal-water slurry (CWS) atomization is examined by comparing classified CWS sprays containing coal particles in different size ranges. The sprays are generated by injecting a CWS mixture into a sonic air jet and the Malvern sizing system nonintrusively measures spray Sauter mean diameters (SMD). The results consistently show that the spray SMDs of the CWS containing smaller coal particles are larger than the spray SMDs of the CWS containing larger coal particles. The internal capillary holding force between the particles and water increases with decreasing particle sizes because of their smaller radii of curvature. This increased holding force strongly resists against the external airblast and makes the atomization difficult. On the other hand, the relatively small capillary holding force of the CWS containing larger coal particles carries weaker resistance to the external airblast, and smaller spray SMDs result.
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Santavicca, J. W. "Wet Flue Gas Desulfurization (WFGD) Slurry Spray Header Design System." In ASME 2005 Power Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pwr2005-50126.
Повний текст джерелаАнотація:
The Babcock & Wilcox Company (B&W) has developed a rule-driven design (RDD) computer application to speed the design of its wet flue gas desulfurization (WFGD) slurry spray header system including support steel. The application, written using the RuleStream RDD system, captures the talents of the many people involved in the spray system’s design, including those involved in process engineering, design engineering technology, structural mechanics, and technical design. B&W’s design standards and best practices are blended with fabricator capabilities and industry standards to form the application rules. Third-party software (for example CAESAR II) and proprietary computer programs are leveraged by the application courtesy of the RuleStream RDD architecture. The application seeks to automate the routine first 80% of the design, while providing interfaces to complete the design or explore “what-if” situations. Interfaces allow the evaluation of spray coverage, pipe velocities, pressure drop, physical clearances, weights, and stresses. The application generates drawings, a solid model, and a bill of material for fabrication. Using the application, repeatable, consistent results are achieved. There is a higher confidence in the generated design and a reduction in design cycle time. This saved time may be allocated to exploring alternative designs, pursuing fabricator quotes, performing contract level analysis in the proposal phase, or may be applied to other areas of the WFGD design.
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Liburdi, J., V. Moravek, and P. Lowden. "LSR™ Slurry Coating Technologies." In ASME Turbo Expo 2001: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/2001-gt-0575.
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A novel slurry process has been developed for producing plain, silicon and platinum modified aluminides. The LSR™ coatings exhibit microstructures, chemistries and oxidation behaviour that are similar to the conventionally specified coatings and can be easily qualified to replace the older pack or spray technologies. The simple, compact LSR™ process makes it possible to incorporate the coating operation in new part manufacturing or repair cells and to reduce the overall cycle time or delivery.
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Stavros, A. J. "Surface Changes of Several Thermal Spray Coatings Abraded by a TiO2 Slurry." In ITSC2003, edited by Basil R. Marple and Christian Moreau. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.itsc2003p0411.
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Abstract Three-body wear is important in many industrial processes. A laboratory study was performed to follow the response of highly polished thermal spray coating surfaces to degradation by hard titanium dioxide particles. A scanning electron microscope, a white light interferometer and a gloss meter were used to evaluate surface structure and texture of the aspolished and abraded surfaces. Tungsten carbide coatings with differing binder material and applied by different processes all degrade by the same mechanism: softer material is worn away by the hard TiO2 particles until the remaining structure consists of the hardest carbides protruding above the general surface plane. This structure is obtained in spite of significant differences in other surface properties such as roughness (Ra) and gloss number. If a more uniform wear surface is desired the carbide spacing must be reduced so that the coating more effectively presents a carbide surface to the TiO2 particles.
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Strasser, Wayne, and Francine Battaglia. "Pulsatile Primary Slurry Atomization: Effects of Viscosity, Circumferential Domain, and Annular Slurry Thickness." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-53026.
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A central theme of our prior experimental and computational work on a transonic self-sustaining pulsatile three-stream coaxial airblast injector involved obtaining spectral content from compressible 2-D models and preliminary droplet size distributions from incompressible 3-D models. The three streams entail an inner low-speed gas, and outer high-speed gas, and an annular liquid sheet. Local Mach numbers in the pre-filming region exceed unity due to gas flow blockage by the liquid. Liquid bridging at somewhat regular intervals creates resonance in the feed streams. The effects of numerical decisions and geometry permutations were elucidated. The focus now shifts to compressible 3-D computational models so that geometric parameters, modeled domain size, and non-Newtonian slurry viscosity can be more elaborately explored. While companion studies considered circumferential angles less than 45°, specific attention in this work is given to the circumferential angles larger than 45°, the slurry annular dimension, and how this annular dimension interacts with inner nozzle retraction (pre-filming distance). Additional metrics, including velocity point spectral analyses, are investigated. Two-stream experimental studies are also computationally studied. Multiple conclusions were drawn. Narrower annular slurry passageways yielded a thinner slurry sheet and increased injector throughput, but the resulting droplets were actually larger. Unfortunately the effect of slurry sheet thickness could not be decoupled from another important geometric permutation; injector geometry physical constraints mandated that, in order to thin the slurry sheet, the thickness of the lip which separates the inner gas and slurry had to be increased accordingly. Increased lip thickness reduced the interfacial shear and increased the thickness of the gas boundary layer immediately adjacent to the slurry sheet. This suppressed the sheet instability and reduced the resulting liquid breakup. Lastly, velocity point correlations revealed that an inertial subrange was difficult to find in any of the model permutations and that droplet length scales correlate with radial velocities. As anticipated, a higher viscosity resulted in larger droplets. Both the incremental impact of viscosity and the computed slurry length scale matched open literature values. Additionally, the employment of a full 360° computational domain produced a qualitatively different spray pattern. Partial azimuthal models exhibited a neatly circumferentially repeating outer sheath of pulsing spray ligaments, while full domain models showed a highly randomized and broken outer band of ligaments. The resulting quantitate results were similar especially farther from the injector; therefore, wedge models can be used for screening exercises. Lastly, droplet size and turbulence scale predictions for two external literature cases are presented.
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Khor, K. A., Y. W. Gu, Y. Li, C. H. Quek, V. J. P. Lim, and P. Cheang. "Novel Bioactive Composites by Thermal Spray Process." In ITSC 2000, edited by Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0625.
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Abstract This paper compares two types of hydroxyapatite (HA) composite coatings, HA/Ti-6Al-4V and HA/Y-ZrO2. The powders used in the study were prepared using a slurry process then deposited by plasma spraying. The resulting coatings were characterized based on their microstructure, mechanical properties, and biocompatibility. Both composite coatings performed better than pure HA coatings in tensile adhesion and indentation tests. Testing also revealed that the HA/Y-ZrO2 coatings had favorable strength and fracture toughness and that the HA/Ti-6Al-4V coatings had good affinity to living tissue and sufficient mechanical strength.
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Chicoski, André, Ramón Sigifredo Cortés Paredes, Gustavo Bavaresco Sucharski, and Anderson Geraldo Marenda Pukasiewicz. "COMPARRISON OF SLURRY JET EROSION BEHAVIOUR OF THERMAL SPRAY COATINGS WITH DIFFERENT LEVELS OF HARDNESS." In 26th International Congress of Mechanical Engineering. ABCM, 2021. http://dx.doi.org/10.26678/abcm.cobem2021.cob2021-2042.
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Tobler, W. J., and W. Durisch. "Slurry and Plasma-spray Coating of Selective Emitting Rare-earth Oxides on High Temperature Resistant Substrates." In THERMOPHOTOVOLTAIC GENERATION OF ELECTRICITY: TPV7: Seventh World Conference on Thermophotovoltaic Generation of Electricity. AIP, 2007. http://dx.doi.org/10.1063/1.2711718.
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Bertrand, G., B. Hansz, F. Tourenne, and C. Coddet. "Plasma Spraying of Spray-Dried AI2O3 Powders." In ITSC 2000, edited by Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p1371.
Повний текст джерелаАнотація:
Abstract Today, powder particles diameter used for thermal spraying is generally comprised between 5 and 100µm with a preferred range around 40µm for APS applications. Actually, the future trends in plasma spraying are directed to the use of fine or ultrafine powders and the reduction of the steps between raw materials and coatings. So, the present paper investigates the way to use directly spray dried ceramic powders in suppressing the sintering stage. AI2O3 based powders were obtained by the spray drying process. By optimizing the parameters (slurry composition and injection as well as drying characteristics), a narrow grain size distribution was achieved. Chemical composition and shape of synthesized powders were analyzed by scanning electron microscopy (SEM) equipped with energy dispersive spectrometry (EDS). The crystallographic structure was identified by X-ray diffraction (XRD). Demonstration was made that it is possible to obtain coatings using directly spray dried ceramic powders. The plasma spray process parameters (such as current intensity, gas flow rate, powder feed rate and injection mode, cooling stage,...) have to be managed to achieve cohesive coatings. The structure and chemical composition of these coatings were studied. In this way, the direct use of spray dried powders appears as a promising way to realize ceramic coatings.
Звіти організацій з теми "Slurry spray"
1
Caton, J. A., and K. D. Kihm. Characterization of coal-water slurry fuel sprays from diesel engine injectors. Office of Scientific and Technical Information (OSTI), June 1993. http://dx.doi.org/10.2172/10104865.
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