Fracture toughness, strength and creep of transparent ceramics at high temperature

Boniecki, Marek; Librant, Z.; Wajler, Anna; Wesołowski, Władysław; Węglarz, Helena

doi:10.1016/j.ceramint.2012.02.028

Cited by 37 publications

(18 citation statements)

References 20 publications

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“…The apparent activation energy values for creep in spinel under our experimental conditions, as well as their dependence on the stress applied (Figure 5), are in good agreement with previously reported data [4,5,7]. The decrease in activation energy with applied stress may be attributed to competition between the GBS and dislocation creep mechanisms of deformation.…”

Section: Resultssupporting

confidence: 91%

“…The stress exponent values obtained are in good agreement with those previously reported [4,5,6,7,8,9,10,11]. Temperature-dependence of the stress exponent was also observed [9] and was attributed to changes in the creep mechanism.…”

Section: Resultssupporting

confidence: 90%

“…One of the main densification mechanisms acting in the final stage of sintering under elevated pressure is high temperature deformation (creep) of ceramic particles or grains [3]. The creep behavior of polycrystalline magnesium aluminate spinel and its capability to undergo superplastic deformation at relatively high temperatures (1300–1800 °C) over a wide range of applied stresses (1–200 MPa) have been investigated [4,5,6,7,8,9,10,11]. However, to the best of our knowledge, there is no data on creep behavior under conditions close to those that are applied during the high pressure SPS process.…”

Section: Introductionmentioning

confidence: 99%

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Creep of Polycrystalline Magnesium Aluminate Spinel Studied by an SPS Apparatus

et al. 2016

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A spark plasma sintering (SPS) apparatus was used for the first time as an analytical testing tool for studying creep in ceramics at elevated temperatures. Compression creep experiments on a fine-grained (250 nm) polycrystalline magnesium aluminate spinel were successfully performed in the 1100–1200 °C temperature range, under an applied stress of 120–200 MPa. It was found that the stress exponent and activation energy depended on temperature and applied stress, respectively. The deformed samples were characterized by high resolution scanning electron microscope (HRSEM) and high resolution transmission electron microscope (HRTEM). The results indicate that the creep mechanism was related to grain boundary sliding, accommodated by dislocation slip and climb. The experimental results, extrapolated to higher temperatures and lower stresses, were in good agreement with data reported in the literature.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Creep of Polycrystalline Magnesium Aluminate Spinel Studied by an SPS Apparatus

et al. 2016

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“…Table shows the hardness and fracture toughness of the transparent yttria ceramic sintered and annealed at 1200‐1500°C and 1200°C, respectively. Obviously, hardness and strength of materials are proportional to the inverse square root of the mean grain size . Furthermore, It is well known that the hardness of materials are proportional to the porosity .…”

Section: Resultsmentioning

confidence: 99%

The effect of SPS parameters on the production of yttria transparent ceramic

Amirzadeh-Fotovat

Hatefi

2019

Int J Applied Ceramic Tech

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In this work, the spark plasma sintering (SPS) of commercial yttria nanopowder is investigated. The SPS parameters such as sintering temperature, applied pressure, and dwell time are varied. Densification without grain growth occurring at occurred up to a sintering temperature of 1400°C and grain growth without further densification taking place at the higher temperature. The optimum sample was obtained at a temperature of 1400°C with a pressure of 70 MPa and dwelling time of 15 minutes. The highest relative density of 99.8% and the average grain size of 1.26 μm were obtained at 1400°C. The yttria ceramic annealed at 1200°C had the in-line transmission of 5%-70% and 70%-82% in the visible and infrared wavelength region, respectively. The measurements of hardness and fracture toughness characteristics of the transparent yttria ceramic showed 9.2 GPa and 2.24 MPa.m 1/2 , respectively. K E Y W O R D S dwell time, sintering pressure, sintering temperature, spark plasma sintering, yttria How to cite this article: Amirzadeh-Fotovat V, Hatefi Y. The effect of SPS parameters on the production of yttria transparent ceramic. Int J Appl

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“…Lanthanide-doped yttrium aluminium garnet has found many applications, among which one can enumerate screens and cathode-ray tubes (CRTs), field emission displays (FEDs), vacuum fluorescent displays (VFDs) as well as electroluminescence devices [11]. Such wide range of applications is linked with both high mechanical stability and wide spectral band of this material [12]. Less attention has been drawn to polycrystalline thulium-doped yttrium aluminium garnet.…”

Section: Introductionmentioning

confidence: 99%