Chemical Characterization of Si‐Al‐C‐O Precursor and Its Pyrolysis

Babonneau, Florence; Sorarù, Gian Domenico; Thorne, K.; Mackenzie, John D.

doi:10.1111/j.1151-2916.1991.tb07172.x

Cited by 62 publications

(35 citation statements)

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“…Therefore, the SiC grain bulk could be used as an internal standard to make a correction for the carbon content in the neighboring areas. The composition was determined to be close to Al 2 OC-2.5SiC, a solid solution phase similar to that reported in Al-O-Si-C systems [10,[33][34][35]. This is a 2H-wurtzite structure with structures and lattice parameters similar to those of the α-Al 2 OC or 2H-SiC [33].…”

Section: Resultsmentioning

confidence: 67%

“…9. Under suitable conditions, such as at sufficiently high temperatures, the formation of a Al 2 OC-SiC solid solution was preferred in the Al-O-Si-C system, presumably because SiC can stabilize the Al 2 OC structure [10,[33][34]. Experimentally we found that when crystallized after prolonged annealing at 1100-1500 o C, a 2H-wurtzite structure with Al 2 OC or Al 2 OC-mSiC compositions was formed [22].…”

Section: Resultsmentioning

confidence: 78%

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Aluminum-containing intergranular phases in hot-pressed silicon carbide

Zhang

Jonghe

2004

J. Mater. Res.

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Section: Resultsmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 78%

Aluminum-containing intergranular phases in hot-pressed silicon carbide

Zhang

Jonghe

2004

J. Mater. Res.

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“…173,174,253,254 The microstructural analysis of the ceramics can be quantitatively analyzed by means of Raman spectroscopy. The Raman spectra of the SiCO products obtained at 1300c C are shown in Fig.…”

mentioning

confidence: 99%

Silicon-Based Polymer-Derived Ceramics: Synthesis Properties and Applications-A Review

Riedel

Mera

Hauser

et al. 2006

Nippon Seramikkusu Kyokai gakujutsu ronbunshi

408

316

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“…The resonance peaks at 0 and +50 ppm can be assigned to AlO 6 and AlO 4 sites, respectively, which are very similar to those of Al 2 O 3 [18] . The resonance peak at +140 ppm can be assigned to the Al-C bond [19] . The element aluminum exists in the form of Al-O bond and Al-C bond in the fibers.…”

Section: The Structure Of Continuous Si-al-c Fibersmentioning

confidence: 99%

Preparation and characterization of continuous high-temperature resistant Si-Al-C fibers by one-step method

Zheng

Wang

et al. 2008

Sci. China Ser. E-Technol. Sci.

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Using polymer-derived technology, continuous high-temperature resistant Si-Al-C fibers were prepared by one step method, which included melt-spinning of polyaluminocarbosilane (PACS), curing of continuous PACS fibers, and sintering of the cured products. The results show that the average diameter and tensile strength of continuous Si-Al-C fibers are 11 to 12 μm and 1.8 to 2.0 GPa, respectively. The chemical formula of Si-Al-C fibers is SiC 1.01 O 0.040 0Al 0.024 , which is nearly stoichometric.The fibers are mainly composed of β-SiC crystalline, small amount of α-SiC, and amorphous SiC. Continuous Si-Al-C fibers exhibit excellent thermal stability. When the fibers were exposed in argon for 1 h, the tensile strength did not decrease until 1500℃. After heat treatment at 1800℃ in argon for 1 h, the fibers maintained about 80% of the initial strength. It was higher than that of Nicalon and Hi-Nicalon fibers.high-temperature resistant, continuous Si-Al-C fibers, one step method, polymer-derived technology Silicon carbide (SiC) fibers, which have high tensile strength, high elastic modulus, good thermal stability, and oxidation resistance, are one of the best candidates of the reinforcements available for continuous-fiber-reinforced ceramic-matrix composites (CMCs) [1] . Polymer-derived technology is one of the main methods to produce continuous SiC fibers [2,3] . It includes four steps: synthesis of polycarbosiane (PCS), melt-spinning, curing of continuous PCS fibers, and pyrolysis of the cured products. But, one problem of those fibers such as Nicalon is that thermo-mechanical stability is good only below 1200℃. The major mechanism of the thermal degradation of SiC fibers has been reported to be the oxidation of silicon and carbon to form volatile CO and SiO products, which eventually develops a porous microstructure in the fibers [4,5] .Recently, several attempts have been made in order to improve the mechanical properties and thermal stability of these fibers. One of the methods is to prepare continuous SiC fibers including hetero-elements through the physical or chemical modification of precursor [6] . For example, the

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Chemical Characterization of Si‐Al‐C‐O Precursor and Its Pyrolysis

Cited by 62 publications

References 20 publications

Aluminum-containing intergranular phases in hot-pressed silicon carbide

Aluminum-containing intergranular phases in hot-pressed silicon carbide

Silicon-Based Polymer-Derived Ceramics: Synthesis Properties and Applications-A Review

Preparation and characterization of continuous high-temperature resistant Si-Al-C fibers by one-step method

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