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Wyświetlanie 1-15 z 32
Tytuł:
Pattern of stress-strain accumulation due to a long dipslip fault movement in a viscoelastic layered model of the lithosphere–asthenosphere system
Autorzy:
Debnath, S. K.
Sen, S.
Powiązania:
https://bibliotekanauki.pl/articles/264497.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
trzęsienie ziemi
lepkosprężystość
aktywność sejsmiczna
aseismic period
dip-slip fault
earthquake prediction
stress accumulation
viscoelastic-layered model
Opis:
The process of stress accumulation near earthquake faults during the aseismic period in between two major seismic events in seismically active regions has become a subject of research during the last few decades. In the present paper a long dip -slip fault is taken to be situated in a viscoelastic layer over a viscoelastic half space representing the lithosphere-asthenosphere system. A movement of the dip-slip nature across the fault occurs when the accumulated stress due to various tectonic reasons, e.g., mantle convection etc., exceeds the local friction and cohesive forces across the fault. The movement is assumed to be slipping in nature, expressions for displacements, stresses and strains are obtained by solving the associated boundary value problem with the help of integral transformation and Green's function method. A detailed study of these expressions may give some ideas about the nature of stress accumulation in the system, which in turn will be helpful in formulating an earthquake prediction programme.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 653-670
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wear Properties of the Surface Alloyed AISI 1020 Steel with Vanadium and Boron by TIG Welding Technique
Autorzy:
Abakay, E.
Sen, S.
Sen, U.
Powiązania:
https://bibliotekanauki.pl/articles/1215751.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.77.Fv
81.40.Cd
81.40.Ef
81.05.Je
81.40.-z
81.40.Pq
Opis:
It is now well known that surface alloying caused improvement in the mechanical/chemical properties of near surface regions of materials. In the present study, surface alloying treatment with boron, vanadium and iron on the AISI 1020 steel was realized by the technique of TIG welding. Ferrous boron, ferrous vanadium and Armco iron were used for surface alloying treatment. Before the treatment, ferrous alloys were ground and sieved to be smaller than 38 μm. The powders were mixed to be composed of $Fe_{15 - x}V_{x}B_5$, where x = 1, 3, and 5 (by at.). Prepared powders were pressed on the steel substrate and melted by TIG welding for surface alloying. Coated layers formed on the steel substrate were investigated using scanning electron microscopy, X-ray diffraction analysis and Vickers microhardness testers. It was shown that the surface alloyed layer has a composite structure including steel matrix and eutectic borides. Wear tests of the surface alloyed AISI 1020 steels were realized against WC-Co ball using ball-on-disk method.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 251-253
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Micaceous iron oxide production by application of magnetic separation
Autorzy:
Tanriverdi, M.
Sen, S.
Ciçek, T.
Powiązania:
https://bibliotekanauki.pl/articles/110370.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
micaceous iron oxide (MIO)
magnetic separation
belt type high gradient magnetic separator
high gradient magnetic separator
pulsating high gradient magnetic separator
Opis:
In this study, different flowsheet options were evaluated to achieve the best upgrading conditions for a micaceous iron oxide ore. The first option included the recovery of micaceous iron oxide particles using a double stage magnetic separation circuit after the grinding and classifying of the ore into coarse (-1000+106 μm) and fine (-106 μm) size fractions. A belt type dry high gradient magnetic separator (BHGMS) was used to beneficiate the coarse fraction. The concentrate of the BHGMS was ground to -106 μm, and combined with the fine fraction produced at screening stage, and subjected to high gradient magnetic separation (HGMS) at 1.2 T. A concentrate grading about 61.33% Fe with 60.3% recovery was obtained applying the separation process incorporating BHGMS and HGMS. A single stage separation circuit considering the use of HGMS after the grinding the ore below 106 μm was employed as the second concentration option. A concentrate having 63.80% Fe with 37.1% weight recovery was obtained in this test. As the highest Fe grade and the lowest S concentration was obtained by application of HGMS after the grinding the ore below 106 μm, and it was decided to conduct a pilot scale study using pulsating HGMS. A concentrate assaying 69.45% Fe with 60.1% weight recovery was produced by operating the pulsating HGMS at 0.6 T. The results showed that it was possible to obtain a micaceous iron oxide concentrate to be used in pigment production using magnetic separation method.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 2; 546-553
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of ZrO₂ Addition on the Structure and Dielectric Properties of BaTiO₃ Ceramics
Autorzy:
Oksuz, K.
Sen, S.
Sen, U.
Powiązania:
https://bibliotekanauki.pl/articles/1032539.pdf
Data publikacji:
2017-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.50.-n
77.84.-s
82.45.Xy
81.30.-t
Opis:
Ba(Ti_{1-x}Zr_{x})O₃ (x=0÷0.3) ceramics were prepared by the standard solid state reaction method and were sintered at 1450°C for 4 h. The structural and dielectric properties of the samples were studied. The phases formed in the ZrO₂ doped BaTiO₃ were tetragonal and of cubic symmetry. Increase in ZrO₂ content in the BaTiO₃ caused to increase of the lattice parameter and crystallite size of the perovskite structure. The evolution of the Raman spectra was studied for various compositions and the spectroscopic signature of the corresponding phase was determined. The scanning electron microscope was used to investigate the microstructure and surface morphology of the sintered samples. Scanning electron microscope observations revealed enhanced microstructural uniformity and retarded grain growth with increase of ZrO₂ content. Dielectric characteristics of ZrO₂ doped barium titanate were studied using a Hioki 3532-50 LCR meter in the frequency range of 1 kHz-1 MHz. It is found that the dielectric constant (ε_{r}) increases while the dielectric loss (tan δ) decreases with increase in zirconium oxide content (x<0.3).
Źródło:
Acta Physica Polonica A; 2017, 131, 1; 197-199
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of aluminum addition to Nb-Al-C-N coatings on AISI M2 steel obtained by thermo-reactive deposition technique
Autorzy:
Abakay, E.
Sen, S.
Sen, U.
Powiązania:
https://bibliotekanauki.pl/articles/1061918.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Gh
81.40.Ef
62.20.Qp
81.05.-t
Opis:
In this study, aluminum-doped (1 and 2 wt.%) and Al-free niobium carbo-nitride coatings were applied to the surface of AISI M2 high speed steel using the process of thermo-reactive deposition technique (TRD) at 1000°C during 1-4 h. The obtained coatings were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) analysis and micro hardness test. Nb-Al-C-N layers were compact and homogeneous. X-ray diffraction analysis has shown that the major phases formed in the coating layer are Nb₂CN and NbN. The depth of the coating layer had increased with the treatment time and ranged from 6.65 to 9.05 μm. The measured values of the hardness of the coating layers were ranging between 2136 and 2636 HK_{0.005}.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 653-655
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Comparative Study on the Corrosion Behaviour of Gas Nitrided and TiAlN Coated AISI D2 Steel by Thermo-Reactive Diffusion Technique
Autorzy:
Cegil, O.
Sen, U.
Sen, S.
Powiązania:
https://bibliotekanauki.pl/articles/1399731.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Je
81.65.Kn
Opis:
In this study, the corrosion behaviors of nitride and titanium aluminum nitride (TiAlN) layers deposited on AISI D2 steel samples are reported. Steel was at first nitrided in a nitrogen and ammonia atmosphere at 575C for 8 h and then titanium nitride coating treatment was performed in the powder mixture consisting of ferro-titanium, aluminum, ammonium chloride and alumina at 1000C for 2 h by thermo-reactive diffusion technique. Phase analysis and corrosion tests were realized on the titanium aluminum nitride coated steel. The corrosion properties of uncoated and coated samples were characterized by potentiostatic polarization test. The tests were conducted using a three-electrode system test unit with a platinum counter electrode of $2.269 cm^2$ and an Ag/AgCl, 3 M KCl electrode as the reference electrode. Nitrided and TiAlN coated steel specimens exhibited higher corrosion resistance than uncoated steel in 0.5 M $H_2SO_4$ solution. Conclusively, the application of nitride and TiAlN films on AISI D2 steel increased surface hardness and corrosion resistance. TiAlN coating exhibits the highest corrosion resistance.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 265-267
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Properties of Cr-Al-N Based Coatings Formed on AISI D2 Steel by Thermo-Reactive Diffusion Technique
Autorzy:
Kılınc, B.
Sen, U.
Sen, S.
Powiązania:
https://bibliotekanauki.pl/articles/1399772.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.-z
62.20.Qp
68.55.J-
81.65.Lp
Opis:
In this study, chromium aluminum nitride coating was applied on pre-nitrided AISI D2 steel by the thermo-reactive deposition technique in a powder mixture consisting of ferrochromium, aluminum, ammonium chloride, and alumina at 1000C for 2 h. Steels were gas nitrided for the purpose to enrich the surfaces with nitrogen of the steels in a nitrogen and ammonia atmosphere at 560C for 8 h. The effect of aluminum content in the powder mixture on the Cr-Al-N layer properties was investigated. The coated samples were characterized by X-ray diffraction analysis, scanning electron microscope, and micro-hardness tests. Chromium aluminum nitride layer formed on the pre-nitrided AISI D2 steel was compact and homogeneous. Electron dispersive spectrometer results showed that coating layer includes chromium, aluminum, and nitrogen. X-ray studies showed that the phases formed in the coating layers on the steel surfaces are $Cr_2N$, $(Cr,Fe)_2N_{1-x}$, $AlN$, and $Fe_2N$. The depth of the Cr-Al-N layer ranged from 10.01 ± 1.2 to 13.2 ± 1.7 μm, depending on the aluminum content. The hardness of the coated layers produced on AISI D2 steel are changing from 1743 ± 150 $HV_{0.01}$ to 2067 ± 160 $HV_{0.01}$ depending on bath compositions.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 271-273
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of B₂O₃ Addition on the Sintering Behavior of 0-5-10% ZrO₂ Doped BaTiO₃ Based Ceramics
Autorzy:
Öksüz, K.
Şen, Ş.
Şen, U.
Powiązania:
https://bibliotekanauki.pl/articles/1401289.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.84.Cg
77.84.-s
Opis:
In this study, the effect of B₂O₃ addition on the sintering behavior of 0-5-10% ZrO₂ doped barium titanate based microwave dielectric ceramics were investigated. For this purpose, the powder mixtures consisting of BaCO₃, TiO₂ and ZrO₂ were prepared by ball milling technique in alcohol using ZrO₂ balls at 200 cycle/min for 20 h. The prepared powders were calcined at 900°C for 2 h. Produced powders were mixed 0.5% B₂O₃ and 5% PVA and pressed as green body under the pressure of 100 MPa. The disc-shaped die-pressed samples were sintered at 1250°C, 1350°C and 1450°C for 4 h. X-ray diffraction analysis showed that the main phases formed in the sintered samples are BaTiO₃ and $Ba(Ti_{1-x}Zr_{x})O_3$. The scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS) were used to investigate microstructure of the sintered samples. The bulk densities of the sintered samples increased with the addition of B₂O₃ content due to the low number of pores trapped between the grains.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1086-1089
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of the Surface Alloyed AISI 1020 Steel with $Fe_{(15-x)}Mo_{x}B_5$ Alloy
Autorzy:
Abakay, E.
Sen, S.
Sen, U.
Powiązania:
https://bibliotekanauki.pl/articles/1292852.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.77.Fv
81.40.Cd
81.40.Ef
81.05.Je
81.40.-z
Opis:
It is now well established that considerable improvement in the mechanical/chemical properties of near surface regions of materials can be achieved by the process of surface alloying. In the present study, surface alloying treatment with molybdenum and boron on the surface of the AISI 1020 steel was realized by the technique of tungsten inert gas welding. Ferrous boron alloy and ferrous molybdenum were used for surface alloying treatment. Before the treatment, ferrous alloys were grinded and sieved to be smaller than 45 μm. Prepared powder was pressed on the steel substrate and melted by tungsten inert gas welding for surface alloying. Coated layers formed on the steel substrate were investigated using optical and scanning electron microscopy, X-ray diffraction analysis and Vickers microhardness testers. It was shown that surface alloyed layer has composite structure including steel matrix and well distributed boride phases. Borides formed in the coated layers have a small precipitated structure and distributed in the grain boundaries as continuous phases. X-ray diffraction analyses show that coated layers include $Fe_2B$, $Fe_{13}Mo_2B_5$, $Mo_2FeB_4$, and iron.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 584-586
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wear Properties of the Surface Alloyed AISI 1020 Steel with $Fe_{(15-x)}Mo_{x}B_5$ by TIG Welding Technique
Autorzy:
Abakay, E.
Sen, S.
Sen, U.
Powiązania:
https://bibliotekanauki.pl/articles/1292921.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Cd
81.40.Ef
52.77.Fv
81.05.Je
81.40.Pq
Opis:
Surface alloying caused the improvement in the mechanical/chemical properties of near surface regions of the steels. In the present study, surface alloying treatment with boron, molybdenum, and iron on the AISI 1020 steel was realized by the technique of TIG welding. Ferrous boron, ferrous molybdenum, and Armco iron were used for surface alloying treatment. Before the treatment, ferrous alloys were ground and sieved to be smaller than 45 μm. The powders were mixed to be composed of $Fe_{(15-x)}Mo_{x}B_5$, where x = 1, 3, and 5 (by at.%). Prepared powders were pressed on the steel substrate and melted by TIG welding for surface alloying. Wear tests of the surface alloyed AISI 1020 steels were realized against WC-Co ball using by ball-on-disk method under the loads of 2.5, 5, and 10 N at the sliding speeds of 0.1 m/s for 250 m sliding distance. Friction coefficient and wear rates of the surface alloyed steel with $Fe_{(15-x)}Mo_{x}B_5$ alloy powder are changing between 0.30 and 0.80 and 5.86 × $10^{-5} mm^3$/m to 2.52 × $10^{-3} mm^3$/m depending on applied load and alloy composition, respectively.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 587-589
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion Behavior of Nitride and Cr-Al-N Coatings Formed on AISI D2 Steel
Autorzy:
Kılınc, B.
Demirkiran, S.
Sen, U.
Sen, S.
Powiązania:
https://bibliotekanauki.pl/articles/1399749.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.65.Kn
68.55.J-
81.65.Lp
Opis:
In the present work, the corrosion behavior of Cr-Al-N coating formed on the pre-nitrided AISI D2 cold work tool steel by thermo-reactive diffusion technique in the powder mixture consisting of ferro-chromium, aluminum, ammonium chloride and alumina at 1000C for 2 h was investigated. The phases formed in the coating layers were $Cr_2N$, $(Cr,Fe)_2N_{1-x}$, $AlN$, and $Fe_2N$ which were confirmed by X-ray diffraction analysis. The uncoated, nitrided, and Cr-Al-N coated specimens were placed in corrosive media (3.5 wt% salt solution). A standard saturated calomel electrode was used as a reference and graphite as a counter or auxiliary electrode. The effectiveness of the coatings in preventing corrosion was tested in the NaCl solution by electrochemical impedance studies using the Nyquist plots and potentiodynamic studies as well. Conclusively, the application of nitride and Cr-Al-N layers on AISI D2 steel increased its surface hardness and corrosion resistance. The corrosion resistance of Cr-Al-N coatings is higher than that of uncoated and nitrided steels.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 268-270
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Electrochemical Study of the Corrosion Resistance of Niobium-Aluminum Carbonitride Coating Produced on Steels by Thermo-Reactive Diffusion Technique
Autorzy:
Abakay, E.
Durmaz, M.
Sen, S.
Sen, U.
Powiązania:
https://bibliotekanauki.pl/articles/1031643.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.65.Lp
81.65.Kn
87.64.Ee
Opis:
Thermo-reactive diffusion/deposition technique is an alternative to physical vapor deposition and chemical vapor deposition techniques for obtaining wear and corrosion resistant coatings on steel parts. In this work, thermo-reactive diffusion/deposition technique was used to produce niobium aluminum carbonitride-based coatings on AISI M2 steel. Characterization of the coatings was done by X-ray diffraction analysis, scanning electron microscopy and energy dispersive spectroscopy. The corrosion resistance of the produced coatings was investigated by using potentiodynamic polarization in a solution of 0.5 M NaCl. Hard, compact and adherent coatings, mainly consisting of NbC and NbN phases were obtained. The corrosion behavior of the samples was investigation by potentiodynamic polarization measurements.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 682-684
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion Properties of CrAlN and TiAlN Coatings Deposited by Thermoreactive Deposition Process
Autorzy:
Cegil, O.
Kılınc, B.
Sen, S.
Sen, U.
Powiązania:
https://bibliotekanauki.pl/articles/1194669.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.45.Bb
81.65.Kn
81.15.-z
Opis:
In the present study, the corrosion behaviors of chromium aluminum nitride (CrAlN) and titanium aluminum nitride (TiAlN) coatings deposited on AISI D2 steel samples are reported. Steel samples were pre-nitrided at 575C for 8 h in the first step of the coating process, and then TiAlN and CrAlN coatings were performed by thermoreactive deposition process in a powder mixture consisting of alumina, ammonium chloride, aluminum and ferrous titanium or ferrous chromium for TiAlN or CrAlN, respectively. Coating treatments were realized at 1000C for 2 h. Coated samples were characterized by X-ray diffraction analysis, optical microscopy, scanning electron microscopy, and microhardness tester. The corrosion properties of uncoated and coated samples were characterized by potentiostatic polarization test. CrAlN and TiAlN coated steel specimens exhibited the higher corrosion resistance than uncoated steels in a 0.5 M NaCl solution.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 359-361
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wear Behavior of TiAlN and CrAlN Coatings Deposited by TRD Process on AISI D2 Steel
Autorzy:
Kılınc, B.
Cegil, O.
Sen, S.
Sen, U.
Powiązania:
https://bibliotekanauki.pl/articles/1219208.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.-z
46.55.+d
81.65.Lp
Opis:
The wear properties of uncoated, chromium aluminum nitride (CrAlN) and titanium aluminum nitride (TiAlN) coated AISI D2 steel were investigated and compared using ball-on-disc method at 0.3 m/s sliding speed and under the loads of 2.5 N, 5 N, and 10 N against $Si_3N_4$ ball as a counter material. Steel samples were nitrided at 575C for 8 h in the first step of the coating process, and then titanium aluminum nitride coating and chromium aluminum nitride were performed by thermoreactive deposition (TRD) process at 1000C for 2 h. Coated samples were characterized by X-ray diffraction analysis, scanning electron microscopy, microhardness, and ball on disk wear tests. The results of friction coefficient and wear rate of the tested materials showed that the TiAlN coating presents the lowest results.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 362-364
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advanced studies on coal injection into a cavitation cell for the purpose of comminution
Badania procesu wtłaczania węgla do komór kawitacyjnych w celu rozdrabniania
Autorzy:
Galecki, G.
Akar, G.
Sen, S.
Li, Y.
Powiązania:
https://bibliotekanauki.pl/articles/219516.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
struga wody
węgiel
rozdrabnianie
wykresy Rosina-Rammlera
waterjet
coal
comminution
Rosin-Rammler plots
Opis:
In this study, the effect of coal comminution with waterjets enhanced by cavitation was investigated. The experiments were carried out using mono-size coal feeds in a batch closed circuit, in a specially designed cell to induce cavitation at 69 MPa inlet pressure and back pressures of zero and 0.345 MPa. Test results were evaluated on the product calculated surface area and the Rosin-Rammler parameters. The experiments showed that the maximum particle size reduction was achieved during the first run through the comminution circuit operated without back pressure. However, a decreasing tendency in comminution efficiency was noted with the number of runs through the system. The use of 0.345 MPa back pressure resulted in a wider size distribution of the product.
W pracy przedstawiono badanie procesu rozdrabniania węgla przy pomocy dysz wodnych, wspomaganego przez kawitację. Eksperymenty prowadzono na partiach brył węgla o jednakowych rozmiarach, w układzie zamkniętym, w specjalnej komorze kawitacyjnej przystosowanej do działania przy ciśnieniu wlotowym 69 MPa i przy przeciwciśnieniu zero i 0.345 MPa. Wyniki eksperymentu określono na podstawie obliczeń pól powierzchni, przy wykorzystaniu parametrów Rosina-Rammlera. Eksperymenty wykazały, że maksymalną redukcję rozmiarów ziaren węglowych uzyskuje się w trakcie pierwszej próby dokonanej w komorze bez zastosowania przeciwciśnienia. Z każdym kolejnym przebiegiem obserwowano malejącą skuteczność rozdrabniania. Zastosowanie przeciwciśnienia rzędu 0.345 MPa spowodowało większy rozrzut wymiarów ziaren w produkcie końcowym.
Źródło:
Archives of Mining Sciences; 2012, 57, 3; 769-778
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
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