Creep rupture strength of magnesium oxide based dense polycrystalline ceramic at temperatures to 1600°C

Bakunov, V. S.; Лукин, Е. С.; Sysoev, É. P.

doi:10.1007/s10717-013-9546-1

Cited by 7 publications

(7 citation statements)

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“…It was found that the strain and rupture processes are not the same in different materials and depend on the crystal-chemical particulars of their structure [2]. It was shown for periclase ceramic that the deformation and rupture processes are interrelated [3]: the product of the time-to-rupture and the steady creep rate is a constant and independent of the testing conditions (temperature and load) as well as the crystal size.The present work continues [3] in the context of expanding the range of materials.The purpose of the present article is to present the results of experiments undertaken to determine the indices of longtime strength of other densely sintered materials (corundum, aluminum-magnesium spinel) as well as to determine the particulars of the behavior of polycrystalline ceramic under a mechanical load at temperatures to 1600°C. …”

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confidence: 83%

“…It was assumed that, just as found in experiments on creep, certain analogies existed in the behavior of polycrystalline ceramic and metallic materials [5,6]. The results of the present work were analyzed taking account of the data in [2,3].…”

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confidence: 92%

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confidence: 99%

“…For this reason the data are presented separately for each type, after which the general laws of their behavior under a load are formulated. The experimental results for periclase ceramic were also taken into account in the analysis [3].…”

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confidence: 99%

“…5 -7. For convenience the results for periclase ceramic are also presented [3]. The main feature of the plots draws our attention: for each of the experimental ceramics the results in the coordinates chosen fall on two straight lines differing in the slope angle.…”

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confidence: 99%

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Time and Strain to Rupture of Dense Polycrystalline Oxide Ceramic at Temperatures to 1600 °C

2014

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The indices of long-time strength (time and strain to rupture) of densely sintered oxide ceramic in the temperature interval 1400 -1600°C under loads to 60 MPa are determined. The characteristics of creep and creep rupture are interrelated: irrespective of the size of the crystals in the ceramic and the testing conditions the product of the steady creep rate and the time to rupture is a constant, i.e., the strain to rupture is a constant. Therefore, the service life of materials can be determined from measurements of the creep rate.The particulars of strain and rupture processes in densely sintered oxide ceramic at temperatures to 1600°C, i.e., somewhat above the temperature of the brittle-to-plastic transition, are examined in [1 -3]. It is shown in [1] that in the entire temperature interval of the plastic behavior of ceramics the main mechanism of deformation is diffusive-viscous flow, which can be accompanied by diffusive movement of dislocations (climb) and diffusive displacement of crystal boundaries.As established in [4], a period of nonstationary strain can be observed in diffusive-viscous flow of polycrystalline bodies. It results from the local strain from stress relaxation on micro defects being added to the flow strain. The micro defects formed under the nonequilibrium conditions of cooling of materials from the high temperatures at which they are fired.When the samples are heated to the testing temperature these defects annihilate all the more completely the higher the temperature reached. In the course of testing they continue to annihilate until stationary creep is reached. Nonequilibrium defects remain in a ceramic in the entire temperature interval of its brittle behavior. Then, when a certain degree of plasticity is reached, they are removed via annihilation, a process that is thermally activated. Thus, the more the testing temperature exceeds the temperature of the brittle-to-plastic transition, the lower the content of nonequilibrium defects. The contribution of the nonstationary strain to the overall rupture strain (strain-to-rupture) decreases.The rupture of a ceramic, specifically, in bending, also occurs by the diffusion pathway during steady creep (i.e., creep at a constant rate) as a result of, first, vacancy formation in sections of the stretched zone that are tied to the crystal boundaries and then coagulation of vacancies on the boundaries [1]. It was found that the strain and rupture processes are not the same in different materials and depend on the crystal-chemical particulars of their structure [2]. It was shown for periclase ceramic that the deformation and rupture processes are interrelated [3]: the product of the time-to-rupture and the steady creep rate is a constant and independent of the testing conditions (temperature and load) as well as the crystal size.The present work continues [3] in the context of expanding the range of materials.The purpose of the present article is to present the results of experiments undertaken to determine the indices of longtime strength of othe...

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confidence: 83%

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confidence: 92%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Time and Strain to Rupture of Dense Polycrystalline Oxide Ceramic at Temperatures to 1600 °C

2014

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Creep in MgO

Pelleg

2017

Creep in Ceramics

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Regimes for High-Temperature Annealing for KO-1 and KO-5 Ceramics by CO2 Laser Radiation

Kovalenko

2015

Glass Ceram

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Nondestructive regimes of high-temperature laser annealing of KO-1 and -5 optical ceramic by CO 2 laser radiation are determined within the framework of the quasistatic uncoupled problem of thermoelasticity for an isotropic plate. The processing regime with short-time action results in a large increase of the required laser radiation power density and a decrease of the require energy density. The processing regime with long-time action results in a decrease of the required energy density. The adequacy of the computational model is checked experimentally.

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Creep rupture strength of magnesium oxide based dense polycrystalline ceramic at temperatures to 1600°C

Cited by 7 publications

References 2 publications

Time and Strain to Rupture of Dense Polycrystalline Oxide Ceramic at Temperatures to 1600 °C

Time and Strain to Rupture of Dense Polycrystalline Oxide Ceramic at Temperatures to 1600 °C

Creep in MgO

Regimes for High-Temperature Annealing for KO-1 and KO-5 Ceramics by CO2 Laser Radiation

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