Processing and microstructure characterization of liquid-phase-sintered, α-SiC matrix composites

Ma, Jingmei; Feng, Yu; Liu, Limeng; Zhang, Haijiao

doi:10.1016/j.jallcom.2009.12.090

Cited by 11 publications

(3 citation statements)

References 25 publications

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“…It is well known that eutectic in situ composite ceramics have high melting point, hardness, creep resistance and sufficient chemical stability at elevated temperatures but are sensitive to plastic deformation [4,5]. Eutectic oxide composites produced by directional solidification, in which the eutectic phases are generated simultaneously from the melt, possess very high structural stability and superior mechanical strength at high temperatures compared to individual components [6,7], and there is free of porosity in them in comparison with sintered ceramics [8]. Especially, eutectic in situ composites are composed of single crystal phases with a huge amount of clean interfaces between them, effectively eliminating grain boundaries and amorphous phases at interface [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Directional solidification and microstructural development of Al2O3/GdAlO3 eutectic ceramic in situ composite under rapid growth conditions

Zhang

et al. 2011

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Directional solidification and microstructural development of Al2O3/GdAlO3 eutectic ceramic in situ composite under rapid growth conditions

Zhang

et al. 2011

Journal of Alloys and Compounds

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“…Ceramic Coatings represent an effective, economic and workable way of protecting metal or ceramic compounds in severe environments. However for preparation of this coating, inorganic binders are required which do not burn, ignite or release any smoke or gas when heated [4][5][6][7][8]. Alkali aluminosilicate may be considered as inorganic polymers which are so called Geopolymers.…”

Section: Introductionmentioning

confidence: 99%

The Effects of SiC Grain Size on SiC-Based Refractory Paints

Khosravanihaghighi

Pakshir

2013

AMR

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Refractory paints based on silicon carbide were investigated with the alkali inorganic binders. In order to optimize the β-SiC granulometric distribution, different mixture of β-SiC along with metakaolin based geopolymers were used. The alkali activator was an aqueous solution NAOH/Na2SiO3. Metakaoline dissolved and reprecipitated in alkaline condition to form geopolymer which acts like a glue to stick un-reacted Al-Si and SiC. Paints were then cured and were exposed to 900°C for 8h. In the present study various proportions of two particle size of SiC were employed and, for providing geopolymers, NaOH/Na2SiO3 as an activator and metakaolin as a raw source material were used. They were applied on the low-carbon steel substrate then characterized and compared with a monomodal of SiC up to 900°C. Due to the analysis by increasing the proportion of Nano-SiC, macrocracks has been emerged.

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“…De acordo com estudos baseados no tipo de aditivo utilizado 45,115 e na variação da proporção entre os mesmos 37,123 São encontradas algumas teorias para explicar a existência de diversos politipos do SiC, levando em consideração algumas questões como: as relações estruturais e os fatores que controlam a formação ou a estabilidade de um determinado politipo como impurezas, pressão ou temperatura 25,116 . Até 1700 °C não há muita transformação de fase, porém, acima desta temperatura, a transformação de fase β para α ocorre de maneira mais significativa 40,45 . Verifica-se a presença de mecanismos de tenacificação, como por exemplo deflexão de trincas (fratura intergranular), assim como o mecanismo de ramificação de trincas ou formação de trincas menores ao redor da trinca principal, onde ocorre a redução da intensidade de tensão na ponta do defeito maior 71 .…”

Section: Ciclos De Choque Térmicounclassified

Resistência ao choque térmico de carbeto de silício sinterizado via fase líquida

Mello¹

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The behavior of ceramic materials towards thermal shock resistance is a topic of great interest, due to applications in which the reliability against sudden temperature variations is required. In this thesis, it was studied how the variation in the proportion of Y 2 O 3 :Al 2 O 3 additives and different parameters on the processing of liquid phase sintered silicon carbide may influence thermal shock resistance of this material. Samples were prepared with molar composition 90%SiC+10%Y 2 O 3 :Al 2 O 3 , by varying oxides molar proportion between 2:1 and 1:4, with and without previous reaction of the additives. Mixtures were compacted and sintered in a resistive graphite furnace at 1750, 1850 and 1950°C, and by hot pressing at 1750 and 1850°C, and evaluated for densification. After analysis of the first results, pressureless sintering and the mixtures with proportions of 1:3 and 1:4 of previously reacted Y 2 O 3 :Al 2 O 3 were selected for the study of thermal shock resistance. Thermal cycles were performed by heating at temperatures of 600, 750 and 900°C and sudden cooling in water at room temperature. The evaluation of samples regarding thermal shock resistance was conducted by determination of elasticity modulus, porosity, flexural strength and microstructural analysis of the cracks. The samples sintered at 1950°C temperature are those that exhibit the best performance in relation to thermal shock resistance, while the variation in the proportions Y 2 O 3 :Al 2 O 3 from 1:3 to 1:4 do not significantly change this property. Under the conditions used, the maximum temperature for liquid phase sintered SiC application must be limited to 750°C, which allows its use as a component of heat exchanges, bearings, pump bearings, gas turbines and sensors of automotive and aeronautical engines.

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Processing and microstructure characterization of liquid-phase-sintered, α-SiC matrix composites

Cited by 11 publications

References 25 publications

Directional solidification and microstructural development of Al2O3/GdAlO3 eutectic ceramic in situ composite under rapid growth conditions

Directional solidification and microstructural development of Al2O3/GdAlO3 eutectic ceramic in situ composite under rapid growth conditions

The Effects of SiC Grain Size on SiC-Based Refractory Paints

Resistência ao choque térmico de carbeto de silício sinterizado via fase líquida

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