Variation of Poisson's ratio of refractory materials with thermal shocks

Podwórny, Jacek; Wojsa, J; Wala, T.

doi:10.1016/j.ceramint.2011.03.070

Cited by 14 publications

(11 citation statements)

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“…The following gradual drop in the E(T) dependence is probably related with the stress relaxation due to a microcrack formation or, as previously reported by Podwórny et al 9 , a channel-like pore formation, which triggers the loosening of the microstructure. Even though the test materials are not considerably different in their chemical and phase compositions, they exhibit distinguishable behaviours of the elastic-modulus change.…”

Section: Discussionmentioning

confidence: 59%

“…Such a behaviour of a material was also previously reported. 9,10 The negative values of Poisson's ratio show that the material unfolds when it is subjected to stretching 11 and the negative v obtained in this research can be ascribed to the rearrangement and rotation of the microstructural components such as large grains, used for the production of the material, or the pores that are always present in the microstructures of refractory materials.…”

Section: Discussionmentioning

confidence: 99%

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Elastic behaviour of magnesia-chrome refractories at elevated temperatures

Jastrzębska¹,

Szczerba²,

Szlęzak³

2015

Mater. Tehnol.

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An investigation of the high-temperature elastic behaviour of four varieties of magnesia-chrome products was conducted in the present work. The starting materials were characterized with XRF, XRD and SEM/EDS analyses. The measurements of the dynamic Young's modulus were performed in a temperature range of 20-1300°C, using the acoustic method. Moreover, the dynamic Young's moduli, shear moduli and Poisson's ratios were established at ambient temperature for the original and after-heating samples. The obtained results showed similar characteristics, but the elastic behaviours of all the refractory test materials were distinguishable. The curve of the Young's modulus changed as a function of temperature, exhibiting a close-to-hysteresis character, with a decreasing area between the lower and upper curve as the Cr2O3 content increased in the material. The Young's modulus and the shear modulus at ambient temperature were lower for the after-heating samples when compared to the original ones. Keywords: Young's modulus, elastic properties, refractories, shear modulus, Poisson's ratio V tem delu je opisana preiskava visokotemperaturnih elasti~nih lastnosti magnezija-kromovih proizvodov. Za~etni materiali so bili ocenjeni z analizo XRF, XRD in SEM/EDS. V obmo~ju temperatur 20-1300°C so bile izvr{ene meritve dinami~nega Young-ovega modula z akusti~no metodo. Nadalje so bili dolo~eni dinami~ni Young-ov modul, stri`ni modul in Poisson-ovo {tevilo pri sobni temperaturi originalnih in toplotno obdelanih vzorcih. Dobljeni rezultati so pokazali podoben karakter, vendar pa se je elasti~no vedenje vseh preizku{anih ognjevzdr`nih materialov razlikovalo. Krivulja Young-ovega modula se spreminja v odvisnosti od temperature, ima ozek histerezni karakter z zmanj{anjem podro~ja med spodnjo in zgornjo krivuljo, ko vsebnost Cr2O3 v materialu nara{~a. Young-ov stri`ni modul je bil pri sobni temperaturi ni`ji pri`arjenih vzorcih v primerjavi z originalnimi.

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Section: Discussionmentioning

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Elastic behaviour of magnesia-chrome refractories at elevated temperatures

Jastrzębska¹,

Szczerba²,

Szlęzak³

2015

Mater. Tehnol.

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“…Thermal stress induced by high transient temperature gradients generates microstructure discontinuities mainly in the form of pores around the inclusions and cracks associated with brittle cracking (e.g., Kingery ; Munz and Fett ; Podwórny et al . ). Quartz inclusions are particularly interesting for the analysis of archaeological pottery in this respect.…”

Section: Discussionmentioning

confidence: 97%

Identification of Pottery Firing Structures Using the Thermal Characteristics of Firing

Thér

2013

Archaeometry

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Firing is a key step in the operational sequence of pottery technology and firing procedures affect many pottery characteristics. It is not clear whether these characteristics can be attributed to specific types of pottery structures. Analysis of 72 experimental pottery firings with a wide range of firing structures has shown that a significant difference exists between one-space and two-space firings, at the very least. The main criterion for description of the firing process consists in the firing procedure rather than the type of firing structure itself. Some types of firing structures are flexible in terms of applicable firing procedures; others, on the contrary, permit only a narrow range of firing procedures.

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“…Many studies have been performed to determine the relationship between thermal expansion and Young's modulus of refractory concretes [19][20][21][22][23][24][25][26]. Most of them were focused on improving the methods used to determine micro-cracks propagation, time of thermal stress relaxation and internal friction.…”

Section: Correlation Between Thermal Expansion and Young's Modulus Ofmentioning

confidence: 99%