Phase formation in porous liquid phase sintered silicon carbide: Part III: Interaction between Al2O3–Y2O3 and SiC

Ihle, J.; Herrmann, Matthias; Adler, J.

doi:10.1016/j.jeurceramsoc.2004.04.017

Cited by 53 publications

(20 citation statements)

References 21 publications

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“…Nevertheless, some coarse grains are also detected as 300 nm T-SiC sintered sample shows some differences. In fact, the main phase is a mixture of cubic β-SiC (3C) and hexagonal α-SiC (4H), whereas small peaks of yttrium silicide (YSi 2 ) and aluminum silicon carbide (Al 4 [29,30]. In particular, they demonstrated that the formation of these phases is favored at 1950 ℃ in flowing argon due to the interaction of silicon carbide powder with additives and the carbonaceous atmosphere inside the furnace.…”

Section: Resultsmentioning

confidence: 99%

Sintering and mechanical properties of β‐SiC powder obtained from waste tires

et al. 2016

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Plasma synthesized SiC powder obtained from quartz and carbonaceous residue of waste tires was successfully sintered at 1925 ℃ by pressureless liquid-phase method using yttria and alumina as sintering aids (T-SiC). Comparison with sintered SiC obtained from commercial powder (C-SiC) put in evidence of similar sintered density (98%T.D.), but much finer microstructure of T-SiC than that of C-SiC. T-SiC also showed higher flexural strength than C-SiC both at room temperature (508 vs. 458 MPa) and at 1500 ℃ (280 vs. 171 MPa). Difference in liquid phase was responsible for the differences in hardness and fracture toughness. The high value of the Young's modulus of T-SiC (427 MPa) confirmed the high degree of sinterability of this powder and that it can be a promising candidate for structural applications with high added value.

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Section: Resultsmentioning

confidence: 99%

Sintering and mechanical properties of β‐SiC powder obtained from waste tires

et al. 2016

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“…In contrast, the ASC specimen maintained its 6H polytype, even after sintering at 2000°C. According to the thermodynamic calculations on the interactions between Al2O3-Y2O3 and SiC by Ihle et al, 27) the most probable reaction for liquid metal phase and gaseous phase formations at temperatures higher than 1877°C in the SiC-Al2O3-Y2O3 system is as follows:…”

Section: Resultsmentioning

confidence: 99%

Suppression of free Si formation during liquid phase sintering of polysiloxane-derived, porous silicon carbide ceramics

Eom

Kim

2010

J. Ceram. Soc. Japan

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Porous silicon carbide ceramics were prepared from a polysiloxane, carbon black, SiC filler, sacrificial templates (co-polymer microbeads) and Al2O3-Y2O3 additives by a carbothermal reduction and subsequent sintering process. The effect of the sintering temperature on the microstructural development and structural characteristics of the porous ceramics was examined by scanning electron microscopy (SEM), X-ray diffractometry (XRD), and Raman spectroscopy. The polysiloxane-derived silicon carbide (PDSC) specimens showed a more homogeneous pore distribution than the powder-processed ones. Both the PDSC and powder-processed specimens contained only β -SiC when sintered at 1700°C. On the other hand, the PDSC specimens sintered at 2000°C revealed the formation of free Si clusters, detected by XRD and Raman spectroscopy, whereas the powderprocessed ones showed only the SiC phases. The formation of such Si clusters was effectively suppressed by adding an excess of carbon during the synthetic process. Raman spectroscopy revealed the existence of carbon layers in the 1700°C-sintered specimens, which were hardly detectable in the 2000°C-sintered ones.

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“…For example, the system is of major interest for the understanding of the liquid phase sintering of SiC ceramics using oxide additives such as Y 2 O 3 . [1] In addition, phase reactions in this quaternary system have to be understood to analyze the compatibility and reactions of protective yttrium silicate coatings on carbon fiber reinforced carbon-based composite engineering materials. The yttrium silicate Y 2 SiO 5 was introduced by Ogura et al [2] as a promising candidate material for the oxidation protection of such materials (e.g., carbon/carbon (C/C), carbon/silicon carbide (C/SiC, C/C-SiC)).…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Calculations and Phase Stabilities in the Y-Si-C-O System

Cupid

Seifert

2007

J Phs Eqil and Diff

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A thermodynamic computer dataset for the Y-Si-C-O system was used for calculations of multicomponent, multiphase reactions. The phase reactions of yttrium silicate coatings for the oxidation protection of C/SiC-based composites were analyzed. They were simulated as a function of the temperature and other environmental conditions. To illustrate the high temperature behavior of the coatings, isothermal sections, isopleths, pseudo-binary and -ternary diagrams, phase fraction diagrams, volatility diagrams and potential phase diagrams are presented. Additionally to the thermodynamic aspects, mass balance criteria were taken into account for the analysis of the active/passive oxidation in the coating system.

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Phase formation in porous liquid phase sintered silicon carbide: Part III: Interaction between Al2O3–Y2O3 and SiC

Cited by 53 publications

References 21 publications

Sintering and mechanical properties of β‐SiC powder obtained from waste tires

Sintering and mechanical properties of β‐SiC powder obtained from waste tires

Suppression of free Si formation during liquid phase sintering of polysiloxane-derived, porous silicon carbide ceramics

Thermodynamic Calculations and Phase Stabilities in the Y-Si-C-O System

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