Temperature dependence of damping in silica refractories measured via the impulse excitation technique

Gregorová, Eva; Pabst, Willi; Diblíková, Petra; Nečina, Vojtěch

doi:10.1016/j.ceramint.2018.02.028

Cited by 18 publications

(5 citation statements)

References 34 publications

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“…Figure 7 presents the SEM images of silica brick made of crystalline silica and silica brick made of cemented silica at room temperature, 1050 °C and after creep at 1550 °C (after cooling to room temperature). It can be observed from Figure 7 (a) and (b) that there are obvious cracks in the particles of the two kinds of silica bricks before use, mineralizer mainly distributes around the large particles and the matrix and promotes the formation of tridymite in these parts [19]. The ‘roof tile’ structure appears in the grain center of silica brick made of crystalline silica, which is the result of microcracks caused by the phase transformation from cubic high temperature to tetragonal low-temperature cristobalite [20].…”

Section: Resultsmentioning

confidence: 99%

Properties of both Chinese silica brick and silica raw material

Fan

Gao

et al. 2022

Ironmaking & Steelmaking

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The phase and morphology changes of both Chinese silica brick and silica raw material after hightemperature heat treatment, as well as the high-temperature compressive creep behaviour of silica bricks were investigated. The results show that silica raw materials presented a dense structure at room temperature, but cracks and pores appeared after heating treatment. With the crushing of silica particles, silica brick was transformed into homogeneous structure, and final homogeneous degree of the silica brick made of crystalline silica is higher than that of cemented silica. The final creep results of the silica bricks showed expansion after high-temperature compressive creep testing (1550 °C, 50 h), and the expansion of silica brick made of crystalline silica was larger. Compared with the Chinese standard GB/T 5073 -2005, setting L0 as the original height of the silica brick can more fully reflect the expansion creep characteristics of silica brick.

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Section: Resultsmentioning

confidence: 99%

Properties of both Chinese silica brick and silica raw material

Fan

Gao

et al. 2022

Ironmaking & Steelmaking

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“…These frequencies are the natural frequencies, undamped, and as soon as damping occur, the displacement of a given point of the beam, in the bending direction, can be written as (if no over-damping), assuming each point of the beam has a single degree of freedom [6]:…”

Section: Natural (Undamped) and Damped Frequenciesmentioning

confidence: 99%

Viscoelastic analysis of RFDA measurements applied to oxide glasses

Khelil

Guéguen

Célarié

et al. 2020

Journal of Non-Crystalline Solids

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The Resonance Frequency and Damping Analysis (RFDA) is now a common experimental technique to measure the elastic moduli of materials vs. temperature. Nevertheless, the elastic moduli are calculated assuming that the frequency measured is the natural one, not impacted by any damping. In oxide glasses, a significant damping occurs below the glass transition temperature, and it may impact the frequency measured, the elastic moduli calculated, as well as the estimated glass transition temperature. We show here, using the equations of linear viscoelasticity, how we can know if the frequency measured is significantly lowered by damping, and how we can estimate the natural frequency to calculate the correct elastic moduli, only from the data provided by the RFDA: the frequency measured and the damping.

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“…The above theoretical investigations merely consider the ideal case of a free-free beam. However, it is not possible for a beam to be completely free, which may affect the damping behaviors in IET [25]. If the supports exert a damping force on the beam, we have:…”

Section: Vibrations Of a Viscoelastic Beam With Free-free Endsmentioning

confidence: 99%

“…The decay rate, generally determined after Fourier analysis of the high frequency IET data (10 3 ~ 10 4 Hz), is equivalent to the logarithmic decrement of amplitude determined in the conventional low-frequency torsion pendulum method [23] and can also be used to understand dynamic behavior of materials [24]. The temperature dependence of the decay rate may peak at some temperatures, which renders some structural information [25] or indicates phase transformation [26]. It was also shown that after glass transition occurs, the decay rate will surge owing to the quick reduction of viscosity [13].…”

Section: Introductionmentioning

confidence: 99%