Thermal treatment of binary carbonaceous/ zirconia gels and formation of Zr(C,O,N) solid solutions

Preiss, H.; Berger, Lutz‐Michael; Szulzewsky, K.

doi:10.1016/0008-6223(95)00147-6

Cited by 55 publications

(28 citation statements)

References 21 publications

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“…The uniformity and small particle size of the powders and coatings derived from the ZNS-C precursors may have influenced reduction. [71][72][73][74] (5) Fiber Coatings (A) Phase and Microstructure: Coating morphology was similar to that observed for other systems. 50 Every filament was coated, but the thickness varied.…”

Section: (4) Zrsio 4 Stabilitysupporting

confidence: 63%

Zirconia–Silica–Carbon Coatings on Ceramic Fibers

Boakye

Hay

Petry

et al. 2004

Journal of the American Ceramic Society

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Precursors for zircon–carbon mixtures were made to coat fibers for ceramic‐matrix composites. Precursors were characterized using XRD, TGA, and DTA. Zircon formed from vanadium‐ or lithium‐doped precursors after heat treatments at ≥900°C in air, but it did not form at 1200°–1400°C in argon when large amounts of carbon were added. Some precursors were used to coat Nextel™ 720 and Hi‐Nicalon™ fibers. The coatings were characterized using SEM and TEM, and coated‐fiber tensile strengths were measured. Although zircon formed in powders, only tetragonal‐zirconia–silica mixed phases formed in fiber coatings at 1200°C in air. Loss of vanadium oxide flux to the fibers may have caused the lack of conversion to zircon. The strengths of the coated fibers were severely degraded after heat treatment at ≥1000°C in air, but not in argon. The coated fibers were compared with zirconia–carbon‐coated fibers made using similar methods. Mechanisms for fiber strength degradation are discussed.

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Section: (4) Zrsio 4 Stabilitysupporting

confidence: 63%

Zirconia–Silica–Carbon Coatings on Ceramic Fibers

Boakye

Hay

Petry

et al. 2004

Journal of the American Ceramic Society

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“…From the DTA curve, we can see that there is a sharp endothermic peak at about 311.6°C with a considerable weight loss in the TG curve. The exothermic peak at 606.4°C is caused by the crystallization from amorphous zirconia to tetragonal zirconia reported by Bokhimi et al 15,16 > For reaction , the calculated enthalpy change below 1500°C is positive, which shows that the carbothermal reduction process is endothermic.…”

Section: Resultsmentioning

confidence: 78%

“…From the DTA curve, we can see that there is a sharp endothermic peak at about 311.61C with a considerable weight loss in the TG curve. The exothermic peak at 606.41C is caused by the crystallization from amorphous zirconia to tetragonal zirconia reported by Bokhimi et al 15,16…”

Section: Methodsmentioning

confidence: 87%

New Route to Synthesize Ultra‐Fine Zirconium Diboride Powders Using Inorganic–Organic Hybrid Precursors

Yan

Huang

Dong

et al. 2006

Journal of the American Ceramic Society

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Ultra‐fine zirconium diboride (ZrB2) powders have been synthesized using inorganic–organic hybrid precursors of zirconium oxychloride (ZrOCl2·8H2O), boric acid, and phenolic resin as sources of zirconia, boron oxide, and carbon, respectively. The reactions were substantially completed at a relatively low temperature (∼1500°C). The synthesized powders had a smaller average crystallite size (<200 nm), a larger specific surface area (∼32 m2/g), and a lower oxygen content (<1.0 wt%), which were superior to some commercially available ZrB2 powders. The thermodynamic change in the ZrO2–B2O3–C system was mainly studied by thermogravimetric and differential thermal analysis. The crystallite size and morphology of the synthesized powders were characterized by transmission electron microscopy and scanning electron microscopy.

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“…As the argon sintering temperature is increased, the presence of a ZrC phase increases and the YSZ peak widths decrease. The ZrC phase has been reported to form around 1200°C in argon; however, a small amount of ZrC is detected at 1150°C, which is clearly seen in Fig. (b).…”

Section: Resultsmentioning

confidence: 87%

Preserving Nanomorphology in YSZ Scaffolds at High Temperatures via In Situ Carbon Templating of Hybrid Materials

2016

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Yttria‐stabilized zirconia (YSZ, 8 mol% Y2O3) scaffolds, with surface areas up to 68 m2/g, were prepared by sintering hybrid inorganic‐organic propylene oxide (PO) gels in an argon atmosphere between 1050°C and 1350°C. During sintering, a hard carbon template forms in situ that preserves the scaffold nanomorphology. The carbon template is completely removed postsinter by heating in air to 700°C. Surface areas of 24, 14, 3.2, and 2.4 m2/g were achieved for argon sintering temperatures of 1050°C, 1150°C, 1250°C, and 1350°C, respectively. By adding glucose to the gel formulation, the amount of carbon template increases from 4 to 59 wt% and the surface area increases from 14 to 68 m2/g. Remarkably, the surface area only decreases to 59 m2/g upon heating to 900°C in air. This in situ carbon templating approach offers a flexible platform to create and preserve highly desirable surface areas and nanomorphologies while sintering at high temperatures. The utility of this approach to improve low‐temperature solid oxide fuel cell electrode performance is discussed.

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Thermal treatment of binary carbonaceous/ zirconia gels and formation of Zr(C,O,N) solid solutions

Cited by 55 publications

References 21 publications

Zirconia–Silica–Carbon Coatings on Ceramic Fibers

Zirconia–Silica–Carbon Coatings on Ceramic Fibers

New Route to Synthesize Ultra‐Fine Zirconium Diboride Powders Using Inorganic–Organic Hybrid Precursors

Preserving Nanomorphology in YSZ Scaffolds at High Temperatures via In Situ Carbon Templating of Hybrid Materials

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