Thermal shock resistance of a refractory castable containing andalusite aggregate

Ribeiro, Guilherme Cunha; Resende, W. S.; Rodrigues, J. A.; Ribeiro, S.

doi:10.1016/j.ceramint.2016.09.079

Cited by 36 publications

(8 citation statements)

References 24 publications

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“…On one hand, the existed andalusite phase in outer layer or inner layer could endow SiC RPCs with better thermal shock resistance at 1300-1400°C. 25 On the other hand, the thermal expansion mismatch between outer layer and SiC skeleton resulted in the residual stress in multi-layered struts in the case of the well-bonded interface during cooling. The quantitative analysis of residual stresses in different layers could be carried out considering a cylindrical shape in three-layered struts ( Figure 6), and the residual stresses between outer layer and SiC skeleton layer were calculated via Equations (1) and (2).…”

Section: Discussionmentioning

confidence: 99%

Enhanced mechanical properties of SiC reticulated porous ceramics via adjustment of residual stress within the strut

Liang

Sang

et al. 2017

Int J Applied Ceramic Tech

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Silicon carbide reticulated porous ceramics (SiC RPCs) with multi-layered struts were fabricated by polymer replica technique with SiC slurry, followed by infiltrating alumina slurries containing andalusite under vacuum condition. The effects of andalusite addition on the microstructure and mechanical properties of SiC RPCs were investigated, also the residual stress within the multi-layered strut was predicted. Theoretical calculations showed that the residual tensile stress generated in the outer layer of SiC RPCs because of its larger thermal expansion coefficient of infiltration slurry than that of SiC slurry at elevated temperature. Furthermore, the addition of andalusite reduced the thermal expansion coefficient and Young's modulus of infiltration slurries, thereby significantly reducing the residual stress of the outer layer in multi-layered struts. The reduced residual tensile stress within the outer layer was beneficial to eliminate surface cracks on the struts, thus improving the mechanical properties and thermal shock resistance of SiC RPCs. K E Y W O R D Smechanical properties, multi-layered struts, residual stress, SiC reticulated porous ceramics

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Section: Discussionmentioning

confidence: 99%

Enhanced mechanical properties of SiC reticulated porous ceramics via adjustment of residual stress within the strut

Liang

Sang

et al. 2017

Int J Applied Ceramic Tech

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“…(NAKAYAMA, 1965;SAKAI;SIMPSON, 1972). Para as curvas B e C, respectivamente trinca semi-estável e estável, o valor de energia aplicado na amostra foi totalmente utilizado no processo de fratura, gerando o valor real de (NAKAYAMA, 1965;SAKAI;. Fonte: Adaptado de Sakai e A energia de fratura pode ser determinada por ensaios mecânicos de flexão em três ou quatro pontos utilizando amostra prismática entalhada ou pelo método da cunha.…”

Section: Energia De Fraturaunclassified

“…Como observado em outros trabalhos (BOCCACCINI et al, 2008;LARSON;HASSELMAN, 1974;RIBEIRO et al, 2016), após os primeiros choques térmicos a taxa de perda de MOR e de ME é acentuada. Após os primeiros choques térmicos as trincas no material são propagadas utilizando a energia das tensões térmicas geradas pelo choque térmico.…”

Section: Massa Específica Aparente E Porosidade Aparenteunclassified

“…O uso de dados de propagação de trinca instável para cálculo de energia de fratura pode levar a resultados superiores aos valores reais de energia de fratura do concreto (NAKAYAMA, 1965;SAKAI;SIMPSON, 1972). Isto se deve a energia fornecida ao corpo de prova durante o ensaio ser superior a energia necessária para fraturar o material.…”

Section: Energia De Fraturaunclassified

“…Os concretos que obtiveram propagação instável da trinca obtiveram taxa de energia fornecida e energia liberada no processo de fratura superiores aos valores para fraturar o material. Isto pode ser observado caso o valor da força de carregamento no material durante a propagação da trinca tiver uma mudança drástica em um intervalo de tempo muito baixo (NAKAYAMA, 1965;SAKAI;. Os concretos A1, B1, B2, B3, B4 e E1 tiveram uma mudança drástica da força em função do tempo.…”

Section: Critério De Estabilidade Da Propagação Da Trincaunclassified

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Estudo comparativo da resistência ao dano por choque térmico em refratários para conjunto de porta ventos de alto-forno

Cristante¹

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Indeck pela paciência, orientação, ensinamentos e suporte. Agradeço aos colegas da sala A13 e UAH pelo suporte, paciência, ensinamento e amizade. Agradeço aos colegas da CSN (especialmente Leocimar, Elton, Fusco e Tiago), da República DNA (especialmente Panda e Planta), Demar-EEL-USP (especialmente Bento, Beto, Chico Paiva), República Pé Na Jaka, República Hospício pelas conversas, conselhos, suporte e amizade. Agradeço aos amigos e colegas de Rio Preto, Mirassol, Itabira, Birmingham, Huntsville, Lorena, São Paulo e Volta Redonda. Especialmente Antônio Mauricio, Aljomar, Betina, Milad, Daniel, Meaghan, Rachel, Sara pela amizade, suporte e conselhos. Agradeço as famílias Cristante, Vechiato e Kummer pelo suporte, paciência e carinho. Especialmente Thales, Catharina, Siamar, Rebekah e José Roberto, que mesmo não estando presente ajudou na formação deste trabalho.Agradeço muito a todos os amigos, colegas e conhecidos que com certeza contribuíram de alguma forma para a realização deste trabalho.Agradeço à CAPES pela bolsa de estudos.Agradeço a USP, CSN e FACTE pelo suporte laboratorial e financeiro para realização deste trabalho.Palavras chave: Choque térmico. Concreto refratário comercial. Parâmetros de resistência ao dano por choque térmico. Propriedades termomecânicas.ABSTRACT CRISTANTE NETO, Â. Comparative study of the thermal shock damage resistance of refractories for blast furnace blowpipe. 2019. 108p. Dissertation (Master This work compares the thermomechanical properties of commercial castable refractories for blast furnace blowpipe application. Ten different compositions of commercial castable refractories with compositions of high alumina, high mullite, and high andalusite were characterized. In order to identify and quantify the composition and microstructure of the castables, X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy with energy dispersive spectrum (SEM-EDS), bulk density, and apparent porosity were used. The thermomechanical characterization was performed through threepoint flexural strength, work of fracture through crack propagation in notched samples, dynamic elasticity modulus, Poisson ratio, and the calculation of the thermal expansion coefficient using the mix law. Cyclic thermal shocks at 1100°C were realized in order to characterize the materials under thermal shock damage environment followed by elasticity modulus, modulus of rupture, and SEM analysis. The parameters for thermal shock resistance (R e R´) and the parameters for thermal shock damage resistance (R´´´, R´´´´ e Rst) were calculated. The thermal shock cycling tests and the thermal shock resistance correlated and showed that all castables had crack nucleation after a thermal shock of 1100°C or higher. The thermal shock damage parameters and the SEM analysis correlate. Castable D1 showed high resistance to thermal shock damage and lower thermal conductivity, which are required properties for the blast-furnace blowpipe application. Thermal shock cycling tests performed on castables should therefore ...

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Reaction mechanism and microstructure evolution of andalusite with zirconia

Zhang

Bao

et al. 2018

J Mater Sci

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Thermal shock resistance of a refractory castable containing andalusite aggregate

Cited by 36 publications

References 24 publications

Enhanced mechanical properties of SiC reticulated porous ceramics via adjustment of residual stress within the strut

Enhanced mechanical properties of SiC reticulated porous ceramics via adjustment of residual stress within the strut

Estudo comparativo da resistência ao dano por choque térmico em refratários para conjunto de porta ventos de alto-forno

Reaction mechanism and microstructure evolution of andalusite with zirconia

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