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      저자 : Q. Mohsen (검색결과 2 건)
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        Studying the self-healing reaction based on zirconium silicide in the Thermal Barrier Coating system

        Z. I. Zaki,Q. Mohsen,S. H. Alotaibi,M. H. El-Sadek 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.2

        This work investigated the behaviour of introducing ZrSi2 layer between the top coat layer Yttria-stabilized zirconia (YSZ)and the bond coat layer CoNiCrAlY in thermal barrier coatings where ZrSi2 layer helped self-healing of the cracks. Powdermixtures of ZrSi2/8YSZ and ZrSi2 /CoNiCrAlY were used to imitate the real case. At 800 °C under argon, there was no changein the chemical composition of both ZrSi2 and 8YSZ. ZrSi2 was oxidized in case of treatment in air atmosphere at 800 °C withno evidence for any self-healing reactions. At 1000 and 1200 °C under argon the formation of ZrSiO4 phase was detected whichwas a strong evidence of self-healing reaction. ZrSiO4 phase was also detected at 1200 °C in air with the appearance of SiO2phase. A limited interaction was detected at 1000 °C between ZrSi2 and CoNiCrAlY under vacuum. Si was detected in thesurface of CoNiCrAlY grains and Ni was detected in the composition of ZrSi2. This behavior could contribute to a chemicalbonding between ZrSi2 and CoNiCrAlY layers. The obtained data were confirmed by XRD, SEM and EDX analyses.

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        Influence of Ti Additions on Martensitic Transformation and Magnetic Properties of Cast Ni51Fe22-xGa27Tix Shape Memory Alloys

        Nader El-Bagoury,Q. Mohsen,M. A. Kaseem,M. M. Hessien 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.5

        The effect of Ti addition on the microstructure, martensitic transformation, magnetic and mechanical properties of polycrystalline Ni51Fe22-xGa27Tix (x=0, 2 and 4) ferromagnetic shape memory alloy was investigated by scanning electron microscope, differential scanning calorimetry and X-ray diffraction. The results showed that the martensitic transformation temperature increases monotonously with the increase of fraction of Ti substitution for Fe. The increase in the martensite transformation temperatures should be related to the change of the electron concentration after the addition of Ti to Ni51Fe22-xGa27Tix alloys. According to the results of X-ray diffraction and magnetic properties, Ti has significant effect the structure of Ni51Fe22-x Ga27Tix. Adding of 4 at% Ti altered the structure of the matrix from five-layered tetragonal martensite of Ni51Fe22Ga27 and Ni51Fe20Ga27Ti2 alloys to non-modulated tetragonal martensite. Magnetic properties proved that the alloy transits from ferromagnetic, five-layered tetragonal martensite, to paramagnetic, non-modulated martensite structure,with increasing Ti content to 4 at.%. Saturation magnetization, remnant magnetization and coercivity of the alloy were significantly influenced by Ti additions. Hardness values of Ni51Fe22Ga27 increased by the addition of Ti.

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