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- 저자 : Sumana Ghosh (검색결과 2 건)
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Interfacial Properties of Metallized Alumina Ceramics
Sumana Ghosh,Kalyan Sundar Pal,Nandadulal Dandapat,Someswar Datta,Debabrata Basu 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.4
An alumina ceramic material (purity-96%) was metallized by the conventional molybdenum-manganese (Mo-Mn) process in which an alumina substrate was coated with Mo-Mn paste and subsequently heat treated at 1400 °C for 10 min. During the entire process a moist H2 and N2 gas mixture (dew point-20 °C)with 3:1 ratio was passed continuously through the furnace. X-ray diffraction analysis of the metallized alumina substrate identified only molybdenum phase at the surface of the metallizing layer. The microstructural observations of the metallized alumina substrate were made by scanning electron microscopy. Energy dispersive X-ray analysis showed the elemental compositions along the cross-sectional region of the metallized alumina substrate. The adhesion of the metallic coatings on the alumina substrates was evaluated qualitatively by a scratch testing technique and quantitatively by an adhesion tester. Nanohardness measurements showed gradual change in the nanohardness values across the metallized alumina substrate.
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Parthiban K.,Ghosh Sumana 한국세라믹학회 2024 한국세라믹학회지 Vol.61 No.3
Oxidation behavior of a novel double-layered thermal barrier coating (TBC) system consisting of glass–ceramic–25 wt.% yttria-stabilized zirconia (YSZ) bond coat and 8 wt.% YSZ top coat was investigated at 900 °C and 1000 °C for 100 h. Devel- oped TBC system showed changes in phase, microstructure, and mechanical properties with increasing temperature. Zircon formation in the glass–ceramic during oxidation (1000 °C, 100 h) enhanced oxidation resistance of the TBC system. Weight gain per unit surface area was about 0.085 mg/cm 2 after 100 h at 1000 °C during oxidation test; whereas, it was much lower (~ 0.04 × 10 –2 mg/cm 2) at 900 °C after same period of time. Tetragonal zirconia (t-ZrO 2) top coat changed to both cubic and tetragonal phases after 100-h exposure at 1000 °C. Nanohardness and Young’s modulus values of bond coat and top coat were increased with increasing temperature.
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