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  • 1
    Electronic Resource
    Electronic Resource
    Preparation and Characterization of Cr〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 Nano-Powders by Sol-Gel Method (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2111-2114 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Cr2O3 nano-powders were successfully fabricated with using chromium nitrate andaqueous ammonia as starting material and urea as dispersant agent by sol-gel method. Theformation of crystalline phase during heat treatment of dry gel was characterized by differentialthermogravimetry (DTG) and X-ray diffraction (XRD) techniques and the temperature ofcalcination was determined as 400°C. Scanning electron microscopy (SEM) was utilized to observethe morphology of the as-fabricated Cr2O3 particles. The results showed that Cr2O3 particles arespherical or square with little agglomeration and a diameter of about 30 nm. The specific surfacearea of Cr2O3 particles was measured as 44.23 m2/g by Brunauer-Emmett-Teller (BET)
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2111.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    The Microstructure and Properties of CrN〈sub〉x〈/sub〉 Films Synthesized by Unbalanced Magnetron Sputtering (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 373-374 (Mar. 2008), p. 176-179 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: CrNx film was widely used in mechanical engineering field because of its excellentanti-wear and corrosion resistance properties. While most of research was focused on mechanicalproperties, little attention had been paid to the corrosion resistance and residual stress of CrNx film .In this paper, CrNx films were deposited on silicon wafer (100) and iron substrate by unbalancedmagnetron sputtering system (UBMS) at different N2 flow. Then the structure, thickness, residualstress, micro-hardness, wear-resistance and anti-corrosion properties of CrNx films were investigated.The results showed that the phase composition of CrNx films transformed from Cr, single phase Cr2N,Cr2N and CrN coexist to single CrN with the N2 flow rate increasing. The CrNx films composed withCr2N phase, which deposited at 6 sccm N2 flow, had the highest microhardness and had highercompressive residual stress. Whereas the CrNx films with CrN and Cr2N phase coexist had the bestwear and corrosion resistance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.373-374.176.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Grain boundary sites in fcc metals studied by PAC (1993)
    Springer
    Hyperfine interactions 79 (1993), S. 761-764 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Perturbed angular correlation of gamma rays (PAC) is applied to study the atomic structure of grain boundaries (gb) in fcc metals using nuclear quadrupole interactions.111In probes were diffused in samples of Au, Cu, Ni and Pt which had first been annealed to form high-angle gbs. Diffusions were carried out at such low temperatures that only gb diffusion should occur (Harrison's type-C kinetic regime), and measurements were made after removing any residual surface activity. For three Pt samples, a unique signal attributed to a gb site was detected with a site fraction of about 50%, coupling frequency ω1=80.0(2) Mrad/s and electric-field-gradient asymmetry parameter η=0. A Pt sample of 99.9995% purity exhibited much less inhomogeneous signal broadening than 99.998% pure samples, indicating the level of purity necessary to observe the gb sites via quadrupole interactions. The broadening is attributed to gb segregation. For Au, Cu and Ni, only ill-defined, non-unique signals were detected, apparently because of gb segregation. The small broadening in the high-purity Pt sample indicates a high degree of uniformity in the crystal structure of the high-angle gb sites. The large site fraction of the 80 Mrad/s signal demonstrates the dominance of a single site for Cd probes in high-angle gbs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567605
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