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  • American Ceramics Society  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Near-Net-Shaped Calcium Hydroxyapatite by the Oxidation of Machinable, Calcium-Bearing Precursors (the Volume Identical Metal Oxidation, or VIMOX, Process) (2000)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 83 (2000), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A novel VIMOX (volume identical metal oxidation) route to near-net-shaped calcium hydroxyapatite, Ca10(PO4)6(OH)2, is demonstrated: the oxidation of machinable Ca—Ca2P2O7 precursors. Mechanically alloyed mixtures of Ca and β-Ca2P2O7 were compacted into disk- and bar-shaped preforms. The latter preforms could be machined into cylinders using a metalworking lathe (200 rpm, hardened steel tooling). After oxidation at 600°C in O2, and then postoxidation annealing in H2O/O2 mixtures at 850°C and 1150°C, phase-pure hydroxyapatite was obtained. Because of offsetting volume changes from calcium oxidation and hydroxyapatite formation, porous hydroxyapatite bodies were produced that retained the shapes and dimensions (within 1%) of the machined precursors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2000.tb01317.x
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  • 2
    Electronic Resource
    Electronic Resource
    Fabrication of Free-Standing Titania-Based Gas Sensors by the Oxidation of Metallic Titanium Foils (2000)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 83 (2000), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A simple method for fabricating TiO2-based sensors of CO(g) is demonstrated: the oxidation of Ti-bearing foils. Metallic foils (35 μm thick) were converted into free-standing, porous rutile foils (60 μm thick) by exposure to O2(g) at 800°—965°C. The oxidized foils contained thin (0.5—1 μm thick), regularly spaced oxide layers oriented parallel to the external surface. The exposure of such porous foils to increasing concentrations of CO(g) resulted in a monotonic increase in the steady-state electrical resistance. Rutile foils sensitive to 50 ppm changes in CO(g) content with response times of a few minutes were produced. The effects of oxidation conditions and copper doping on sensing performance are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2000.tb01320.x
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  • 3
    Electronic Resource
    Electronic Resource
    Dense, Shaped Ceramic/Metal Composites at lessthan equal to1000°C by the Displacive Compensation of Porosity (DCP) Method (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The Displacive Compensation of Porosity method for fabricating dense, shaped ceramic/metal composites at modest temperatures is demonstrated. In this process, liquid-metal/solid-ceramic displacement reactions are used to generate more ceramic (by volume) than is consumed, so that pores within a ceramic preform can be filled with the new ceramic phase (i.e., densification without sintering). Dense, lightweight MgO/Mg-Al composites (74–86 vol% oxide) and higher-melting, co-continuous MgAl2O4/Fe-Ni-Al-bearing composites (42–59 vol% oxide) have been produced via the pressureless infiltration and reaction of magnesium-bearing liquids with porous preforms of Al2O3 and NiAl2O4+Fe, respectively, at temperatures of 900°−1000°C. The composites are relatively tough and retain the shapes and dimensions (to within a few percent) of the starting preforms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb01829.x
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  • 4
    Electronic Resource
    Electronic Resource
    Dense, Near Net-Shaped, Carbide/Refractory Metal Composites at Modest Temperatures by the Displacive Compensation of Porosity (DCP) Method (2002)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 85 (2002), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Dense, near-net-shaped, carbide-rich, carbide/tungsten composites have been produced at modest temperatures by the displacive compensation of porosity (DCP) method. Porous, freestanding WC preforms were infiltrated and reacted with a Zr2Cu liquid at 1300°C and ambient pressure. The carbon in the WC was displaced by zirconium in the melt to yield ZrCxand tungsten. The increase in solid volume associated with this displacement reaction was compensated by the prior pore volume of the preform. Dense ZrCx/WC/W composites that possessed 〈5 vol% residual copper-bearing phase, and retained the shape and dimensions of the preform, were produced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00164.x
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  • 5
    Electronic Resource
    Electronic Resource
    Low-Temperature Synthesis of BaAl2O4/Aluminum-Bearing Composites by the Oxidation of Solid Metal-Bearing Precursors (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: BaAl2O4/aluminum-bearing composites have been synthesized via the low-temperature oxidation of Ba-Al precursors. Ba-Al powder mixtures that were prepared via high-energy vibratory milling were uniaxially pressed into bar-shaped specimens that were then exposed to a series of heat treatments in pure, flowing oxygen at temperatures up to 640°C. Oxidation at a temperature of 300°C resulted in the formation of barium peroxide (BaO2). Additional heat treatment at a temperature of 550°C resulted in the consumption of BaO2 and some aluminum to yield BaAl2O4 and Al4Ba. The oxidation of Al4Ba at a temperature of 640°C yielded additional BaAl2O4. Microstructural analyses revealed that a well-dispersed, co-continuous mixture of Al2O3-excess BaAl2O4 and 99.5% pure aluminum was produced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb01752.x
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