High-temperature Young’s moduli and dilatation behavior of silica refractories

Pabst, Willi; Gregorová, Eva; Kloužek, Jaroslav; Kloužková, Alexandra; Zemenová, Petra; Kohoutková, Martina; Sedlářová, Ivona; Lang, Karel; Kotouček, Miroslav; Nevřivová, Lenka; Všianský, Dalibor

doi:10.1016/j.jeurceramsoc.2015.09.020

Cited by 17 publications

(7 citation statements)

References 14 publications

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“…The value of d E /d T is negative below 180°C and becomes positive at higher temperatures. A similar decrease in E is observed in the cristobalite‐tridymite composite, which is attributed to diffuse transitions among tridymite subpolymorphs. Previous publications have emphasized that the α → β displacive phase transition of cristobalite increases the value of E , while the decrease in E below 180°C in this work might result from internal stress generated during heating.…”

Section: Resultssupporting

confidence: 83%

A simple approach for improving high‐temperature mechanical and insulation performance in chamotte with added zircon

Xiang

et al. 2019

Int J Applied Ceramic Tech

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Chamotte is one of the most commonly used raw materials for aluminosilicate refractories. The present work concerns the high-temperature performance of the chamotte-zircon composite. The crystalline phase, mechanical property, and thermal conductivity were evaluated. In addition, the finite element method was applied to analyze stress distribution. Zircon accelerated the melting of cristobalite in chamotte during sintering. After adding zircon, a drastic elastic modulus change at about 230°C was avoided, and the infrared shielding effect of zircon reduced the thermal conductivity when the temperature was greater than 500°C. At last, based on the results of finite element method, increasing zircon content reduced stress concentration. K E Y W O R D Saluminosilicates, finite element analysis, modulus of elasticity, refractories, zircon

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Section: Resultssupporting

confidence: 83%

A simple approach for improving high‐temperature mechanical and insulation performance in chamotte with added zircon

Xiang

et al. 2019

Int J Applied Ceramic Tech

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“…Others have observed and reported a similar phenomenon with silica refractories. 1,2,15 This unusual dependence of Young's modulus on temperature is not well understood at the moment. Between 25 and 200 • C, the crystallized SiO 2 phases expand with increasing temperature, whereas tridymite undergoes reversible phase transformations, including γ ⇋ β and β ⇋ α.…”

Section: Young's Modulusmentioning

confidence: 99%

“…They are primarily composed of tridymite and cristobalite and contain more than 93 wt.% SiO 2 . 1,2 In coke ovens, the typical service temperature of CSBs is between 1000 and 1200 • C, with a cyclic fluctuation of approximately 200 • C. 3 Due to the excellent creep resistance of CSBs at intermediate temperatures, the campaign life of a coke oven may exceed 25 years, 4 and with adequate maintenance, it may exceed 40 years. 5 Different approaches to maintenance are used to repair damaged areas of a coke oven.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, the volume stability of FSBs/blocks during the early stages of their installation is desirable to maintain safe working conditions throughout the coke oven. Extensive research on CSBs was conducted to better understand the relationship between composition and properties, for example, the temperature dependence of Young's modulus, 1,15,16 the effect of a component on the properties of silica refractory, 2 and thermal and mechanical properties. 6,8,[11][12][13]16,17 However, the abovementioned properties of FSBs and their dependence on composition remain unknown, despite the fact that several publications have recently described their thermal, mechanical, and fracture properties.…”

Section: Introductionmentioning

confidence: 99%

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Thermal expansion and Young's modulus evolution of fused silica and crystalline silica‐containing materials

Yin

Jin

Zhu

et al. 2022

Int J Applied Ceramic Tech

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Fused silica bricks (FSBs) with exceptional thermal shock resistance are frequently used to repair localized damage in coke ovens and are hold promising candidates for the efficient construction of new coke ovens. To maximize their utilization, the effects of thermal history on the thermal expansion and Young's modulus evolution of FSBs were investigated in comparison to crystalline silica bricks (CSBs). Due to the gradual phase transformation of fused silica into cristobalite, the thermal expansion of FSBs are sensitive to the thermal cycle; both silica materials exhibit an increase in thermal expansion after five cycles at 1200 • C, whereas the thermal expansion of CSBs is five times greater than that of FSBs. When the testing temperature is less than 1000 • C, Young's modulus of CSBs is more sensitive to the thermal history, which is caused by phase transformation-induced microcracks. This sensitivity reduces when the testing temperature is 1200 • C, as microcracks healed by liquid phase as well as the softening of residual glass phase. By contrast, when the testing temperature is 1200 • C, Young's modulus of fused silica specimens is sensitive to the thermal history owing to the microcracks caused by the gradual phase transformation of fused silica to cristobalite.

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“…The reason is that the correction factors depend the shape of structures are difficult to obtain accurately. Thus some researches have been done about mechanical parameters detection in different materials [27][28][29][30][31][32][33][34][35][36][37], environmental variability [38][39][40][41][42][43][44][45], different dimension sizes [46], etc., based on beams of rectangular cross section and rods of circular cross section only. Moreover, we try to do some exploration about mechanical parameters detection for laminated composites based on plates of rectangular cross section.…”

Section: Introductionmentioning

confidence: 99%

Mechanical parameters identification for laminated composites based on the impulse excitation technique

Song

Zhong

Xiang

2017

Composite Structures

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This study suggests a simple, quick and non-destructive method for investigation of mechanical parameters (dynamic Young's modulus, dynamic shear modulus and Poisson's ratio) detection for rectangular plate structures in laminated composites which only utilizes the fundamental resonant frequency in flexural and torsional modes, mass and dimensions of structures. The method is based on the impulse excitation technique (IET) to pick up the fundamental resonant frequency and then the corresponding formulas are applied to evaluate the mechanical parameters. Numerical simulations using finite element method (FEM) and experimental investigations of several cases based on IET are introduced to verify the accuracy of the IET formulas. The results show that the IET is applicable for mechanical parameters identification for laminated composites plates. The method is expected to detect mechanical parameters of other more complicated structures.

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High-temperature Young’s moduli and dilatation behavior of silica refractories

Cited by 17 publications

References 14 publications

A simple approach for improving high‐temperature mechanical and insulation performance in chamotte with added zircon

A simple approach for improving high‐temperature mechanical and insulation performance in chamotte with added zircon

Thermal expansion and Young's modulus evolution of fused silica and crystalline silica‐containing materials

Mechanical parameters identification for laminated composites based on the impulse excitation technique

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