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Wyświetlanie 1-3 z 3
Tytuł:
Potencjometryczny sensor chloru
Potentiometric chlorine sensor
Autorzy:
Dziubaniuk, M.
Janora, S.
Pasierb, P.
Rękas, M.
Powiązania:
https://bibliotekanauki.pl/articles/155648.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
sensory potencjometryczne
ogniwa stałe
sensor chloru
tlenochlorek lantanu
potentiometric gas sensors
solid cells
chlorine gas sensor
lanthanum oxy-chloride
Opis:
Do konstrukcji sensora chloru wybrano tlenochlorek lantanu, LaOCl, jako elektrolit stały. Jego warunki preparatyki określono metodą analizy termicznej oraz dyfrakcji promieniowania rentgenowskiego. Mikrostrukturę spieku elektrolitu określono przy użyciu mikroskopii elektronowej. Charakterystykę sensora wyznaczono dla koncentracji chloru w powietrzu w zakresie 0-100 ppm. Skonstruowany sensor pracuje poprawnie i jest stabilny w zakresie temperatur 500 - 800°C. Wyznaczona zależność napięcia źródłowego ogniwa od koncentracji chloru jest zgodna z prawem Nernsta dla n=2.
A chlorine gas sensor was fabricated with the Cl- ion conducting lanthanum oxy-chloride, LaOCl, a solid electrolyte. Preparation conditions, especially the optimal calcination temperature, were determined by means of the differential thermal analysis (DTA), thermogravimetry (TG) as well as mass spectrometry (MS). According to the x-ray diffraction (XRD) analysis, the product was homogenous and crystallized in tetragonal P4/nmm structure. Scanning electron microscopy (SEM) revealed that it is composed of uniform grains of the 210-260 nm dimension. The sensor manu-facture consisted of several steps. Firstly, the powder of LaOCl was pressed in pellet die (100 MPa) and calcined at 700°C for 2 hours. Then, both sides of polished pellet were covered with Pt paste. It was fired at 1100°C for 2 hours after cooling down the pellet was attached to Al2O3 tube using the ceramic binder to allow the separation of both electrode compartments during the sensor operation. The device was dried and heated at 370°C. The electromotive force (EMF) of the constructed cell was measured asa function of temperature (400- 800°C), Cl2 concentration in air (0-100 ppm) at sensing electrode and time. Air with constant concen-tration of chlorine (100 ppm) gas atmosphere was kept at reference electrode. The sensor exhibited reliable, stable and reproducible signal at operation temperature between 500 - 800°C. The deter-mined EMF vs. logp(Cl2) dependence may be described by the Nernst law for n= 2.
Źródło:
Pomiary Automatyka Kontrola; 2010, R. 56, nr 6, 6; 525-528
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations on the Microstructure and Corrosion Performance of Different WC-Based Cermet Coatings Deposited by High Velocity Oxy Fuel Process onto Magnesium Alloy Substrate
Autorzy:
Jonda, Ewa
Łatka, Leszek
Maciej, Artur
Khozhanov, Aleksandr
Powiązania:
https://bibliotekanauki.pl/articles/2201928.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
AZ91 magnesium alloy
HVOF
thermal spraying
metal matrix composite coatings
microstructure
electrochemical corrosion
Opis:
In the field of surface engineering, thermal spraying is very wide adopted in many branches of the industry. The main reasons of such situation are its flexibility as well as cost effectiveness. Among others, High Velocity Oxy Fuel (HVOF) technique is dedicated for spraying hardmetal and cermet coatings, especially for wear- and corrosion resistance. Such type of coating could be a promising candidate as protective layer for magnesium alloys elements. These materials need a strong improvement in the corrosion protection as well as on the field of wear resistance in order to be widely used in the industry. In this work, different WC-based coatings, namely: (i) WC-Co, (ii) WC-Co-Cr and (iii) WC-Cr3C2-Ni manufactured by HVOF spraying, were investigated. The form of all feedstock materials was agglomerated and sintered powder. All coatings were sprayed with the same technological parameters, especially spray distance which was equal to 400 mm on the AZ91 magnesium alloy substrate. The main aim of the studies was to investigate the influence of the powder material on the corrosion resistance of obtained coatings. The manufactured coatings were examined in terms of its microstructure, using scanning electron microscope (SEM) and corrosion performance, which was assessed in the electrochemical corrosion investigations in 3.5% NaCl solution by Tafel method. The study showed that the corrosion resistance increasing in such order: AZ91 < WC-Cr3C2-Ni < WC-Co < WC-Co-Cr. It should be stressed that WC-Cr3C2-Ni coating exhibits very low corrosion performance, which could be effected by relatively high porosity (c.a. 3 vol.%) and because of that the more complex composition promotes creation of many corrosion cells.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 2; 25--35
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factors Influencing Cavitation Erosion of NiCrSiB Hardfacings Deposited by Oxy-Acetylene Powder Welding on Grey Cast Iron
Autorzy:
Szala, Mirosław
Walczak, Mariusz
Hejwowski, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/2023792.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
hardness
stainless steel
cavitation erosion
cast iron
surface engineering
powder welding
surface roughness
hardfacing
twardość
stal nierdzewna
erozja kawitacyjna
żeliwo
inżynieria powierzchni
spawanie proszkowe
chropowatość powierzchni
utwardzanie
Opis:
The work presents the results of a study on cavitation erosion (CE) resistance of two NiCrSiB self-fluxing powders deposited by oxy-acetylene powder welding on cast iron substrate grade EN-GJL-200. The mean hardness of deposits A-NiCrSiB, C-NiCrSiB is equal to 908 HV, 399 HV and exceeds those of EN-GJL-200 and X5CrNi18-10 reference specimens 197 HV and 209 HV, respectively. To study CE, the vibratory apparatus has been used and tests were conducted according to the ASTM G32 standard. Cavitation eroded surfaces were examined using a profilometer, optical and scanning electron microscopy. The research indicated that the CE resistance, expressed by the cumulative mass loss decreased in the following order C-NiCrSiB > A-NiCrSiB > X5CrNi18-10 > EN-GJL-200. Therefore, hardfacings were characterised by lower cumulative mass loss, in turn, higher CE resistance than the reference sample and therefore they may be applied as layers to increase resistance to cavitation of cast iron machine components. Results indicate that in the case of multiphase materials, hardness cannot be the main indicator for CE damage prediction while it strongly depends on the initial material microstructure. To qualitatively estimate the cavitation erosion damage (CEd) of NiCrSiB self-fluxing alloys at a specific test time, the following factors should be considered: material microstructure, physical and mechanical properties as well as surface morphology and material loss both estimated at specific exposure time. A general formula for the CEd prediction of NiCrSiB deposits was proposed.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 4; 376-386
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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