Preparation of SiC nanowires-filled cellular SiCO ceramics from polymeric precursor

Pan, Jianmei; Yan, Xuehua; Cheng, Xiaonong; Lu, Qingbo; Wang, Mingsong; Zhang, Chenghua

doi:10.1016/j.ceramint.2012.05.081

Cited by 28 publications

(9 citation statements)

References 36 publications

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“…The growth mechanism was evidenced from the presence of a spherical nodule of catalyst at the tip of the nanostructure. On the other hand, growth of SiC nanowires in absence of a metallic catalyst is also reported in the literature . In this, the nanowires growth is by the vapor–solid (VS) mechanism .…”

Section: Resultsmentioning

confidence: 88%

“…On the other hand, growth of SiC nanowires in absence of a metallic catalyst is also reported in the literature. [55][56][57][58][59] In this, the nanowires growth is by the vapor-solid (VS) mechanism. [55][56][57][58] In the VS mechanism, SiO vapor produced by the reaction of SiO 2 present on the silicon surface with carbon or silicon reacts with carbon to form SiC nanowires.…”

Section: Resultsmentioning

confidence: 99%

“…[55][56][57][58][59] In this, the nanowires growth is by the vapor-solid (VS) mechanism. [55][56][57][58] In the VS mechanism, SiO vapor produced by the reaction of SiO 2 present on the silicon surface with carbon or silicon reacts with carbon to form SiC nanowires. [55][56][57][58] In the present case, we have not intentionally added any catalyst.…”

Section: Resultsmentioning

confidence: 99%

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Low‐Density Open Cellular Silicon Carbide Foams from Sucrose and Silicon Powder

et al. 2016

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Open cellular SiC foams with low densities were prepared by thermo‐foaming and setting (130°C–150°C) of silicon powder dispersions in molten sucrose followed by pyrolysis and reaction sintering at 1500°C. The bubbles generated in the dispersion by water vapor produced by the –OH condensation was stabilized by the adsorption of silicon particles on the air‐molten sucrose interface. The composition of a sucrose‐silicon powder mixture for producing SiC foam without considerable unreacted carbon was optimized. The sucrose in the thermo‐foamed silicon powder dispersion leaves 24 wt% carbon during the pyrolysis. The sintering additives such as alumina and yttria promoted the silicon‐carbon reaction. SiC nanowires with diameters in the range of 35–55 nm and length >10 μm observed on the cell walls as well as in the fractured strut region were grown by both vapor–liquid–solid and vapor–solid mechanisms. Large SiC foam bodies without crack could be prepared as the total shrinkage during pyrolysis and reaction sintering was only ~30 vol%. The relatively low compressive strength (0.06–0.41 MPa) and Young's modulus (14.9–24.2 MPa) observed was due to the large cell size (1.1–1.6 mm) and high porosity (93%–96%).

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Low‐Density Open Cellular Silicon Carbide Foams from Sucrose and Silicon Powder

et al. 2016

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“…There are no droplets on the tips of the SiC nanowires indicating that the VLS mechanism cannot be applied to the growth of SiC nanowires. Therefore, the vapor-solid (VS) growth mechanism is the most plausible growth model for the SiC nanorods [29][30][31]. The carbothermal reduction between silica and free carbon generally produces a large amount of SiO and CO gas, and thus promotes the generation of SiC nanorods according to the gas reaction (1) [27].…”

Section: Resultsmentioning

confidence: 99%

High temperature structure evolution of macroporous SiOC ceramics prepared by a sol–gel method

Liu

Meng

Zhang

et al. 2015

Ceramics International

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“…The results indicate that different pore characteristics can be obtained from template method. Furthermore, the carbon source and pores derived from the pyrolysis of templates can contribute to the formation of expected phases, such as SiC nanocrystallines and nanowires [20,21]. It is highly desirable to obtain one-dimensional SiC nanowires as a reinforcement material because of their chemical stability, good resistance to thermal shock and oxidation, and high temperature strength [22].…”

Section: Introductionmentioning

confidence: 99%