International Journal of Minerals, Metallurgy and Materials
MaterialsThermodynamic analysis and preparation of β-SiC/ZrO2 composites
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Cited by (10)
Carbothermal reduction of ZrSiO<inf>4</inf> for in situ formation of ZrO<inf>2</inf>-based composites using spark plasma sintering
2023, Ceramics InternationalCitation Excerpt :In 2009, Ma et al. synthesized ß SiC/ZrO2 composite powder by zirconium carbonyl reduction and carbon black with La2O3 at 1530 °C for 4 h in an argon atmosphere. Their results showed that the use of 2% by weight of La2O3 in the initial composition of powders will cause the faster decomposition of zircon and the formation of SiC [6]. Changes in the Gibbs free energy of reactions (1), (2), and (3) show that these reactions are possible at temperatures above 1740, 1490, and 1580 °C, respectively, due to the negative Gibbs free energy values [10].
Embedded ZrC-SiC nanocomposites from hydrothermal precursor with temperature-dependent oxidation resistance and high sinterability
2019, Journal of Alloys and CompoundsCitation Excerpt :Preparation of ZrC or SiC from an oxide-carbon precursor is generally represented by the following equations:ZrO2 (s) + 3C (s) = ZrC (s) + 2CO (g)SiO2 (s) + 3C (s) = SiC (s) + 2CO (g) Eq. (1) or (2) is a simplified carbothermal reduction that actually consists of a series of solid-solid, solid-gas, and gas-gas reactions [11,40–42]. It is necessary to determine and optimize the C/(Zr + Si) molar ratio to produce a stoichiometric ZrC-SiC without residual carbon.
Fabrication of non-oxide ceramic powders by carbothermal-reduction from industrial minerals
2016, Ceramics InternationalCitation Excerpt :During heat treatment, Si, or SiO in gaseous form, is liberated and further reacts with excess of carbon to form SiC. Reaction of carbothermal reduction of zircon and diatomaceous earth, or any other source of SiO2, strongly depends on amount and shape of particles of the starting materials as well as on specific surface of the added carbon [10,11,18–23]. Formation of ZrC from zirconia is usually represented by the following general reaction [18]:ZrO2+3C=ZrC+2CO(g)
In situ synthesis of ZrC/SiC nanocomposite via carbothermic reduction of binary xerogel
2014, Journal of Alloys and CompoundsPreparation of ZrO<inf>2</inf> and ZrO<inf>2</inf>/SiC powders by carbothermal reduction of ZrSiO<inf>4</inf>
2011, Journal of Alloys and CompoundsCitation Excerpt :Weak reflections of SiC and m-ZrO2 are also present, together with some traces amounts of t,c-ZrO2. Subsequent formation of ZrC at 1673 K in respect to formation of SiC at 1573 K, is in accordance with thermodynamic predictions based on free-energy calculations [2,24,27,30], i.e. formation of SiC is favored at lower temperatures than that of ZrC. At 1773 K (Fig. 10d), m-ZrO2 phase is completely transformed into the ZrC.
[This study was financially supported by the National Natural Science Foundation of China (No.50274021) and Baoshan Iron and Steel Co. Ltd.]