The role of zircon particle size distribution, surface area and contamination on the properties of silica–zircon ceramic materials

Wilson, Paul J.; Blackburn, S.; Greenwood, R.; Prajapti, B.; Smalley, K.

doi:10.1016/j.jeurceramsoc.2011.03.005

Cited by 52 publications

(30 citation statements)

References 18 publications

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“…Further, it should have a dimensional stability for forming cooling path having an accurate size. [3][4][5] Generally, since dimensional changes in fused silica are not big at high temperature during investment casting due to a low thermal expansion coefficient of 0.5 × 10 −6 /K, it is widely used as a primary material for making ceramic core. 6) A little amount of zircon is used as an additive for the core.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Fused Silica Crystallization on Flexural Strength and Shrinkage of Ceramic Cores for Investment Casting

Kim

Yeo

Choi

2016

J. Korean Ceram. Soc

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Complex designed silica-based ceramic cores were fabricated by ceramic injection molding. Slow heating rate (0.2K/min) for debinding restrained bloating on the surface of ceramic cores. To investigate effect of sintering conditions on mechanical properties of ceramic cores, green bodies were sintered at temperatures in a range from 1150°C to 1400°C for various dwelling times (6 h to 48 h). Sintering above 1300°C for 12 h and dwelling time over 24 h at 1200°C reduce the flexural strength and increase the linear shrinkage of ceramic cores. Cristobalite, formed by high sintering temperature or long dwelling time, induces reduction of mechanical properties due to its phase transformation, which is accompanied by volume contraction and microcracking. Ceramic core sintered at 1200°C for 12 h endured wax patterning and shell molding, and was manufactured successfully.

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Section: Introductionmentioning

confidence: 99%

The Effect of Fused Silica Crystallization on Flexural Strength and Shrinkage of Ceramic Cores for Investment Casting

Kim

Yeo

Choi

2016

J. Korean Ceram. Soc

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“…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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“…Figure 4 shows the FTIR profiles of the BSA functionalised positive (grey curve) and negative DNDs. 33 The FTIR profiles suggested the successful functionalisation of both positive and negative DNDs with BSA ( Figure 4). The profiles of both functionalised samples were very similar, with peaks at ~3320 cm -1 indicating N-H vibrations.…”

Section: Colloidal Stability Of Bsa-functionalised Dnds In Complex Mediamentioning

confidence: 94%

“…Surface chemical profiles of BSA-conjugated positive and negative DNDs. The FTIR spectra of BSA conjugated positively (grey) and negatively charged (black) DNDs33 show similar spectra with characteristic peaks for functional groups of BSA.The non-functionalised negative DNDs, that were stable in water, aggregated in PBS.On the other hand, the BSA-functionalised negative DNDs formed a stable colloidal suspension in water as well as in PBS. The suspension of the negative DND-BSA complex in water was shown to have a hydrodynamic radius of ~36 nm, with a stable zeta potential value of -45.6 mV.…”

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confidence: 92%

Influence of surface composition on the colloidal stability of ultra-small detonation nanodiamonds in biological media

Bradac

Rastogi

Cordina

et al. 2018

Diamond and Related Materials

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Fluorescent nanodiamonds (NDs) are strong contenders as bio-labels for life science imaging, diagnostics and therapeutics. Ultimately, for their use in biomedical applications, their size should ideally be less than 10 nm. Yet, even more critical for their specificity and efficient uptake in cellular systems, is their resilience to aggregation, which is dictated by their colloidal stability in complex, physiological environments. To this end, we characterize ultrasmall detonation NDs (~5 nm) by examining their surface chemical profiles and stability in solutions of varying ionic strength and pH. Using dynamic light scattering measurements, we demonstrate that ultra-small ND particles with chemically homogeneous and negatively charged surface profiles are more stable than positive particles under a broad range of simulated biological environments. We show that the colloidal stability of both positive and negative ultra-small NDs is improved by functionalization with bovine serum albumin. Based on these analyses, we propose and describe strategies for enhancing the overall colloidal stability of ultra-small NDs and their resilience to aggregation. Our findings provide a practical framework towards the reduction in size of the bio-conjugates employed to probe complex biological systems, and the advancement of bio-imaging techniques with minimal perturbation of the molecular trafficking in cellular and organelle systems.

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The role of zircon particle size distribution, surface area and contamination on the properties of silica–zircon ceramic materials

Cited by 52 publications

References 18 publications

The Effect of Fused Silica Crystallization on Flexural Strength and Shrinkage of Ceramic Cores for Investment Casting

The Effect of Fused Silica Crystallization on Flexural Strength and Shrinkage of Ceramic Cores for Investment Casting

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

Influence of surface composition on the colloidal stability of ultra-small detonation nanodiamonds in biological media

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