Investigation on cristobalite crystallization in silica-based ceramic cores for investment casting

Kazemi, Arqavan; Faghihi-Sani, M.A.; Alizadeh, Hamid

doi:10.1016/j.jeurceramsoc.2013.06.025

Cited by 141 publications

(95 citation statements)

References 7 publications

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“…Kazemi et al (2014) investigated the effect of the zircon content on the mechanical and chemical behaviours of injection moulded silica-based ceramic cores. Kazemi et al (2013) presented the results of the crystallisation of fused silica and its effects on the most important properties of injection moulded silica-based ceramic cores, including the flexural strength and leachability. Qin and Pan (2009) prepared a series of alumina-based ceramic core nanocomposites by adding silicasol to an alumina matrix and using the in situ synthesis method.…”

Section: Introductionmentioning

confidence: 99%

Ceramic cores for turbine blades via injection moulding

Gromada

Świeca

Kostecki

et al. 2015

Journal of Materials Processing Technology

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Section: Introductionmentioning

confidence: 99%

Ceramic cores for turbine blades via injection moulding

Gromada

Świeca

Kostecki

et al. 2015

Journal of Materials Processing Technology

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“…Meanwhile, these indicate that the crystallization process of cristobalite mainly occurs at 1300 °C, which is consistent with the results of the previous paper. [9] However, the amount of cristobalite in the sample at 1250 °C in Figure 2 is slightly more than that of the other samples prepared below 1250 °C, which is mainly caused by a small amount of the existed cristobalite as the seed in the raw sample. [3] Figure 4(b) shows the XRD pattern of the samples without silicone resin subjected to the same heat treatment.…”

Section: Resultsmentioning

confidence: 82%

“…Although the amount of cristobalite in the sample increases at 1300 °C, the amount of cristobalite formed is not high enough to have a significant effect on the bending strength. [9][10][11] Therefore, any increase in strength caused by the additional densification at 1300 °C will be limited by the negative effect of cristobalite.…”

Section: Resultsmentioning

confidence: 99%

Effect of silicone resin on the properties of silica ceramic cores by heating treatment

Yang

et al. 2016

Journal of Adhesion Science and Technology

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state Key laboratory of advanced special steels, shanghai university, shanghai, china ABSTRACT Silica ceramic cores prepared by heat-press molding were strengthened by impregnating silicone resin. The effect of heating treatment conditions on the properties of silica ceramic cores was analyzed. Results showed that the ambient bending strength increased from 9.3 ± 2.0 MPa to 24.8 ± 1.5 MPa by curing process at low temperature of 250 °C. However, further heating treatment at high temperature ranging from 1150 to 1300 °C made the strength of the samples lower than that of the cured samples owing to the decomposition of silicone resin. But the strength of the samples was still higher than that of raw samples. The increasing heating treatment temperature promoted an increase in the strength by a densification process.

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“…In addition, microcracks formed by volume contraction of cristobalite decrease the flexural strength. 6), 8) 10) In our previous study, colloidal alumina was infiltrated in the ceramic core of silica-zircon composite to prevent the crystallization of cristobalite. Through the adsorption of infiltrated alumina onto the surface of silica, mullite, which inhibits the formation of microcracks induced by the phase transformation of cristobalite, was formed and improved the mechanical properties.…”

Section: ¹1mentioning

confidence: 99%

Effective infiltration with polyethyleneimine-grafted colloidal alumina particles for silica-based ceramic cores

Choi

Kim

et al. 2017

J. Ceram. Soc. Japan

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Amine-functionalized alumina colloidal particles were prepared using polyethyleneimine (PEI) for enhancing the infiltration process of silica based ceramic core. The surface properties of PEI-grafted alumina particles were adjusted to improve their dispersion behavior in aqueous suspension, and the surface charge was adjusted to enhance their adsorption behavior, in neutral pH atmosphere, via an electrostatic repulsion force with a fused silica matrix containing an implied strong negative charge. The characteristics of the surface-modified particles were optimized as shown by the CH stretching vibration and NH bending vibration from FT-IR spectra, and the surface charge alternated from ¹3 to 45 mV. As a result, the dispersion behavior in aqueous solvent was advanced as indicated by the decrease of the polydispersity index, decrease of the average size from 178 to 58 nm, and sharpness of the particle size distribution parabola. These improvements greatly contributed to the acceleration of the infiltration time and efficiency (up to 30 min). Consequently, the promptly infiltrated specimens improved the flexural strength from 3.2 to 10.2 MPa and reduced the linear shrinkage rate from 1.91 to 1.05% as well.

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Investigation on cristobalite crystallization in silica-based ceramic cores for investment casting

Cited by 141 publications

References 7 publications

Ceramic cores for turbine blades via injection moulding

Ceramic cores for turbine blades via injection moulding

Effect of silicone resin on the properties of silica ceramic cores by heating treatment

Effective infiltration with polyethyleneimine-grafted colloidal alumina particles for silica-based ceramic cores

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