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Yoshimura, Humberto Naoyuki; Cruz, Antonio Carlos da; Zhou, You; Tanaka, Hidehiko

doi:10.1023/a:1014964701803

Cited by 22 publications

(10 citation statements)

References 10 publications

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“…Campos et al [39] and Tsakiris et al [40] reported that the boron can be incorporated into the SiC via solid solution or can also persist as dispersed phase, and the B 4 C detection limit of XRD is ∼5 wt%. With increasing sintering temperature, the transition from 6H to 4H was observed in both the samples sintered by SPS and conventional sintering, which was also observed in the previous study reported by Yoshimura et al [41], who reported that 6H polytype of SiC tends to transform to 4H polytype with increasing sintering temperature in 0.4 wt% B 4 C and 1.8 wt% C-added SiC. Rietveld analysis was used for the quantitative phase analysis of the SPS and CS samples, and the results are shown in table 1.…”

Section: Methodssupporting

confidence: 87%

Effects of sintering conditions on the microstructure and mechanical properties of SiC prepared using powders recovered from kerf loss sludge

Cho

Shin

et al. 2018

Bull Mater Sci

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The effects of sintering conditions on the microstructure and mechanical properties of the sintered SiC prepared using the SiC powder recovered from the kerf loss sludge were investigated. The recovered SiC powders were consolidated by spark plasma sintering (SPS) and conventional sintering methods. The effects of sintering temperature, time and methods (SPS and conventional sintering) on the phase, grain size and density of SiC were systematically studied. The Vickers hardness of spark plasma-sintered (SPSed) samples was higher than that of conventional sintered samples due to small grain size. When holding time was increased from 10 to 30 min, the grain size and relative density of SPSed samples were also increased, which lead to the almost constant Vickers hardness by competing effects of grain size and relative density. When holding time was over 30 min, no appreciable change of the relative density and grain size were observed, which can lead to similar values of Vickers hardness. SPS process can be used to make SiC with high density and hardness at relatively low temperature compared with the conventional sintering process.

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Section: Methodssupporting

confidence: 87%

Effects of sintering conditions on the microstructure and mechanical properties of SiC prepared using powders recovered from kerf loss sludge

Cho

Shin

et al. 2018

Bull Mater Sci

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“…2) não está associada com este fenômeno. Uma possível explicação é a ocorrência de crescimento e coalescimento de poros em altas temperaturas, que leva à diminuição da pressão interna dos gases (pelo aumento do raio do poro) e, como conseqüência, resulta em expansão do volume dos gases e dos poros, o que causa a diminuição da densidade [24,25]. A pressão interna dos gases aprisionados nos poros fechados (principalmente N 2 do ar) parece ter influência significativa, pois, em experiências realizadas em nosso laboratório, o pó utilizado pode ser sinterizado a 1850 °C sob vácuo ou em atmosfera de hidrogênio e resultar em corpos com significativa transmissão luminosa, i.e., com baixa porosidade.…”

Section: Resultsunclassified

Efeito da porosidade nas propriedades mecânicas de uma alumina de elevada pureza

et al. 2005

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ResumoUma alumina de elevada pureza dopada com MgO foi sinterizada entre 1300 e 1700 °C para preparação de corpos com diferentes porosidades. Foram determinadas a resistência à flexão em quatro pontos, a tenacidade à fratura pelo método SEVNB, a dureza Vickers, as velocidades sônicas (longitudinal e transversal) e as constantes elásticas (ν, E, G e K) pelo método do pulso-eco ultrassônico. Os resultados foram comparados com os modelos baseados em concentração de tensão (CT) e modelos baseados na área sólida mínima (ASM). A porosidade das amostras variou entre 0,8% e 35%. Em geral, as propriedades diminuíram com o aumento da porosidade, sendo que a diminuição foi menos acentuada nas velocidades sônicas e mais acentuada na dureza. O coeficiente de Poisson só diminuiu em porosidade acima de 19%. O modelo analítico (CT) que melhor se ajustou aos resultados dos módulos E e G foi o de Hashin-Rosen para configuração de poros cilíndricos alinhados transversalmente à tensão aplicada. A análise pelos modelos de ASM indicou que, até 19% de porosidade, o modelo de poros esféricos em arranjo cúbico foi predominante e, acima desta porosidade, atuou também o modelo de partículas esféricas em arranjo cúbico. Palavras-chave: alumina, propriedades mecânicas, porosidade, sinterização. Abstract A high purity alumina doped with MgO was sintered between 1300 and 1700 °C in order to prepare samples with different porosities. The following properties were determined: four-point flexural strength, fracture toughness, by SEVNB method, Vickers hardness, (transversal and longitudinal) sonic velocities, and elastic constant (ν, E, G e K), by ultrasonic pulse-echo method. The results were compared with models based on stress concentration (SC) and models based on minimum solid area (MSA

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“…It is known that the transformation of b-SiC into a-phase seems to generate many defects, such as stacking faults, which cause the SiC grain to elongate. 18 In our experimental data, we observed the elongation of the SiC grain while phase transition occurred from b-to a-phase at temperatures above 2100uC. Figure 10 shows relative density of SiC sintered bodies using b-SiC powder derived from alkoxide precursor.…”

Section: Resultsmentioning

confidence: 61%

Synthesis of beta-SiC powder from alkoxide precursor and study of its sintering behaviour

Jung

Ahn

Lee

et al. 2012

Advances in Applied Ceramics

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In this study, b-SiC powder was prepared using a pyrolysed spherical precursor derived from the hydrolysis mixture of phenyltrimethoxysilane and tetraethyl orthosilicate. Before the pyrolysed experiment, an alkoxide precursor was characterised using 29 Si solid nuclear magnetic resonance, Fourier transform infrared spectroscopy and thermogravimetric analysis. The alkoxide precursor was heated at 1800uC for 4 h under an Ar atmosphere. To examine the pyrolysed residue after heat treatment, the sample was collected and analysed with X-ray diffraction. The X-ray diffraction results for the sample show diffraction peaks at ,35, 60 and 73u, which correspond to the b-SiC phase. According to the results of chemical analysis, the SiC content of the powder that was prepared at 1800uC was determined to be 99?4%. The sintering behaviour of the prepared b-SiC powder was examined using B 4 C and C as sintering additives in the temperature range of 1900-2200uC.

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Cited by 22 publications

References 10 publications

Effects of sintering conditions on the microstructure and mechanical properties of SiC prepared using powders recovered from kerf loss sludge

Effects of sintering conditions on the microstructure and mechanical properties of SiC prepared using powders recovered from kerf loss sludge

Efeito da porosidade nas propriedades mecânicas de uma alumina de elevada pureza

Synthesis of beta-SiC powder from alkoxide precursor and study of its sintering behaviour

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