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  • 1
    Electronic Resource
    Electronic Resource
    Formation of MoS2 phase in Al2O3, ZrO2, and SiO2 through ion implantation of constituent elements (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 5169-5175 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Polycrystalline α-Al2O3 and yttria-stabilized ZrO2 substrates were coimplanted with 175-keV Mo+ and 74-keV S+ at doses of 1×1017 and 74-keV S+ and 2×1017 cm−2, respectively. An amorphous SiO2 substrate was coimplanted with 175-keV Mo+ and 74 keV S+ at doses of 4.97×1016 and 1.02×1017 cm−2, respectively. The energies of Mo+ and S+ ions were chosen to obtain a nearly overlapping depth profiles in all three substrates. Transmission electron microscopy, Rutherford backscattering, and Auger electron spectroscopy techniques were used to characterize the ion-implanted materials. The formation of MoS2 phase was observed in the as-implanted condition as well as after annealing at 700 °C in all substrates. Thermodynamic calculations were performed to predict the equilibrium binary phase formed in Al2O3, ZrO2, and SiO2 under the present implantation and annealing conditions. The predictions agree with the experimental findings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347058
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  • 2
    Electronic Resource
    Electronic Resource
    Simultaneous chromizing-aluminizing coating of austenitic stainless steels (1988)
    Springer
    Oxidation of metals 29 (1988), S. 239-254 
    Details
    ISSN: 1573-4889
    Keywords: Diffusion coating ; pack cementation ; stainless steel ; activator ; masteralloy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Chromium and aluminum were simultaneously co-deposited by diffusion into austenitic stainless steel substrates, by a single-step, pack-cementation process. The mechanism for the formation of diffusion-coated products on 304 and 316 stainless steels and on Incoloy 800 is discussed. The morphologies of the phases formed at the surface, i.e., an external beta layer and an underlying multiphase interdiffusion zone, are presented. The formation of the brittle, β, outer layer was minimized by variations in the pack composition and activator. The coated 304 and 316 steels exhibited excellent scaling resistance upon oxidation in air at 1000°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00751798
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  • 3
    Electronic Resource
    Electronic Resource
    Formation of a chromium-carbide conversion coating on silicon carbide (1994)
    Springer
    Oxidation of metals 42 (1994), S. 191-203 
    Details
    ISSN: 1573-4889
    Keywords: silicon carbide ; chromium carbide ; conversion coating ; pack cementation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The formation of a chromium-carbide conversion coating on SiC was achieved using the pack-cementation technique. The conversion coating is intended to improve the corrosion resistance of SiC and its derivatives, such as SiC-base continuous fibers and composites, by forming a protective Cr2O3 scale upon exposure to high-temperature corrosive environments. Different pack chemistry and processing parameters were evaluated in the laboratory. Results indicated that the coating morphologies and compositions achieved were significantly affected by variation of these processing factors. In this paper, the conversion coating obtained from one of the systems investigated is reported. The coating consists of a multilayered structure with each of the sublayers containing a high-Cr concentration. In addition, the coating surface is relatively dense and pore free compared to the underlying SiC substrate material. A dense and pore-free morphology is highly desirable for coating applications, especially on porous substrates. The multilayered coating structure consists of the following sublayers: Cr23C6/Cr7C3/Cr7C3+Cr3Si/Cr5Si3Cx/SiC substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01052022
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    Paper (German National Licenses)
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