التفاصيل البيبلوغرافية
| العنوان: |
MICROSTRUCTURE CHARACTERISTICS OF Cr3C2-NiCr COATINGS DEPOSITED WITH THE HIGH-VELOCITY OXY-FUEL THERMAL-SPRAY TECHNIQUE. |
| Alternate Title: |
KARAKTERISTIKE MIKROSTRUKTUR Cr3C2-NiCr PREVLEK IZDELANIH S TEHNIKO NAPRŠEVANJA V TOKU PLINSKE MEŠANICE KISIKA IN PROPANA Z VELIKO HITROSTJO. (Slovenian) |
| المؤلفون: |
Lauzuardy, Jason, Basuki, Eddy Agus, Martides, Erie, Septianissa, Selly, Prawara, Budi, Dedi, Junianto, Endro, Riyanto, Edy |
| المصدر: |
Materials & Technologies / Materiali in Tehnologije; Mar/Apr2024, Vol. 58 Issue 2, p137-145, 9p |
| مصطلحات موضوعية: |
BOILER tubes, THERMAL efficiency, METAL spraying, X-ray fluorescence, SCANNING electron microscopy |
| Abstract (English): |
With the goals of protecting boiler tubes from hostile surroundings, increasing thermal efficiency, and minimizing time losses from damage, thermal-spray coating methods for high-temperature operations were created. Ceramic-metal composite materials (e.g., Cr3C2-NiCr) are well known for protecting components from erosion decay in a high-temperature environment. In this investigation, the high-velocity oxy-fuel (HVOF) thermal-spray technique was employed to successfully deposit several variations of feedstocks containing Cr3C2-NiCr and NiCr powders onto a medium-carbon steel substrate, with and without filtering through a 400-mesh screen. Utilizing X-ray fluorescence (XRF), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD), the microstructure features of the deposited coatings were assessed. The experiment results demonstrate that the crystallite and grain sizes of the deposited coatings can be increased by reducing the powder size through a sifting process using a 400-mesh sieve. This procedure also resulted in a coating with a higher density and lower porosity. Furthermore, new compounds including Cr2O3 and MnCr2O4 were formed in the coating layers as indicated by the XRD spectra. These phenomena are in good agreement with the EDS mapping of Cr and O, which reveals highly similar distributions. Manganese was originally a part of the substrate composition. Manganese could diffuse rapidly across the Cr2O3 layer and form the MnCr2O4 compound, indicating the manganese diffusion from the substrate into the Cr3C2-NiCr coating. The formation of MnCr2O4 can be attributed to the prior emergence of the Cr2O3 compound. [ABSTRACT FROM AUTHOR] |
| Abstract (Slovenian): |
Z namenom, da bi se cevi bojlerjev zaščitile pred škodljivimi vplivi oklice, povečala njihova toplotna učinkovitost in zmanjšale časovne izgube zaradi poškodb oziroma vzdrževanja, se v novejšem času za nanašanje tankih zaščitnih slojev uporabjajo metode termičnega naprševanja v toku plinske mešanice kisika in propana z veliko hitrostjo (HVOF; angl.: high velocity oxy-fuel thermal spray coating). Za ta namen so danes poznani kot najučinkovitejši kompozitni materiali keramika-kovina (to je: Cr3C2-NiCr), ki uspešno preprečujejo propadanje komponent (cevi) zaradi visoko temperaturne korozije. V tem članku avtorji opisujejo uporabo termičnega naprševanja zaščitnih plasti s HVOF postopkom. Uspešno so izdelali več vrst zaščitnih plasti (slojev), ki so jih izdelali z omenjenim postopkom. Na podlago iz srednje ogljičnega jekla so nanašali Cr3C2-NiCr in NiCr nefiltrirane prahove ter predhodno presejane prahove na filtru z velikostjo odprtin cca 37 mikrometrov (400 mesh). Za karakterizacijo mikrostrukture izdelanih zaščitnih slojev so uporabili rentgensko fluorescenco (XRF), vrstično elektronsko mikroskopijo (SEM), spektroskopijo na osnovi energije sipanja elektronov (EDS), in rentgensko difrakcijo (XRD). Eksperimentalni rezultati so pokazali, da narašča velikost dendritov in kristalnih zrn z zmanjšanjem količine doziranja prašne mešanice skozi 37 mikrometersko sito. Ta postopek je zmanjšal poroznost in povišal gostoto izdelanih zaščitnih slojev. V XRD spektru so avtorji zaznali tudi nastanek novih spojin, kot sta Cr2O3 in MnCr2O4. To se je dobro ujemalo tudi z izdelano vzdolžno in prečno EDS porazdelitvijo vsebnosti kroma (Cr) in kisika (O). Mangan (Mn) originalno izvira oziroma je difundiral v napršene plasti iz jeklene podlage preko Cr2O3 in tvoril MnCr2O4. To nakazuje, da se je med naprševanjem Cr3C2-NiCr prahu pri visoki temperatur najprej tvoril Cr2O3, nato pa je zaradi difuzije Mn iz jeklene podlage v plasteh začela nastajati še faza MnCr2O4. [ABSTRACT FROM AUTHOR] |
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