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Barbashov, V. I.; Gogotsi, G. A.; Akimov, G. Ya.; Timchenko, V. M.; Chaika, E. V.

doi:10.1023/a:1019607212457

Cited by 3 publications

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References 1 publication

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“…Probably, just this mechanism is realized in experimental studying of electrical conductivity in ScSZ ceramics under mechanical loading (7).…”

Section: Ecs Transactions 91 (1) 1185-1192 (2019)mentioning

confidence: 99%

Conductivity of ScSZ Ceramics in Vicinity of Polymorphic Phase Transitions

Barbashov¹,

Chaika²

2019

ECS Trans.

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The effect of phase composition on ionic conductivity behavior in scandia-stabilized zirconia ceramics with various scandia concentrations during heating was studied. It was found that the homogeneous single-phase (cubic) ceramics reveals no hysteresis or kinks in Arrhenius plots (log σT versus 1/T) indicating on polymorphic transitions in course of heating within temperature range under study (523 to 823 K). Unlike the homogeneous material, two-phase ceramics demonstrates a conductivity jump in the low temperature range (600-630 K) of Arrhenius plot, which grows with increase in scandia concentration or decrease in grain size and corresponding rise in rhombohedral phase β content at room temperature. It is shown that this effect can be caused by intragrain crystal structure ordering under mechanical stresses arising in rhombohedral phase containing ceramics.

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“…Probably, just this mechanism is realized in experimental studying of electrical conductivity in ScSZ ceramics under mechanical loading (7).…”

Section: Ecs Transactions 91 (1) 1185-1192 (2019)mentioning

confidence: 99%

Conductivity of ScSZ Ceramics in Vicinity of Polymorphic Phase Transitions

Barbashov¹,

Chaika²

2019

ECS Trans.

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Anisotropy of Mechanical Properties of Zirconia-Based Ceramics Tested for Bending

Barbashov

Tkachenko

2004

Refractories and Industrial Ceramics

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Thin‐wall ceramic CAD/CAM crown copings: strength and fracture pattern

Bindl

Lüthy

Mörmann

2006

J of Oral Rehabilitation

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The strength and fracture pattern of posterior CAD/CAM-generated crown copings with 0.4 mm wall thickness were evaluated in vitro hypothesizing that fracture resistance of YTZP-zirconia copings might be independent of mode of cementation whether resin-bonded or cemented because of the high strength of YTZP-zirconia. Two sets of copings (n = 15) each were fabricated using CEREC inLab CAD/CAM from (i) lithiumdisilicate glass-ceramic, (ii) infiltration ceramic as controls and (iii) YTZP-zirconia. Copings (n = 15) of ceramics (i), (ii) and (iii) each were (a) zinc-phosphate cemented, (b) adhesively seated on resin-based composite dies and loaded until fracture. Load (N) data was analysed using anova and Scheffé tests. Crack pattern was evaluated on additional three sample cross-sections for each group at fracture-start. Radial cracks originated early at the cementation interfaces and cone cracks were observed finally at the loading sites. Mean load (N) values (+/-s.d.) of A-copings at fracture-start/-end (i) 804 +/- 195/862 +/- 162, (ii) 923 +/- 180/975 +/- 147, (iii) 697 +/- 110/1607 +/- 145, were all significantly (P < 0.01) lower when compared with their B-crown coping analogs (i) 1183 +/- 318/1919 +/- 326, (ii) 1621 +/- 165/1820 +/- 211, (iii) 731 +/- 115/1973 +/- 287 except for A3 and B3 at fracture-start. This confirmed our hypothesis at fracture-start (P > 0.05) but rejected it at fracture-end (P < 0.01). The A3 fracture-end data, even if significantly (P < 0.01) lower, came close to the B3 values by 18%. A3 was significantly (P < 0.001) stronger by 86/74% than A1/A2 at fracture-end. The data indicates that YTZP-zirconia copings have the potential to provide support for all-ceramic core crowns, which may be adequate for non-adhesive cementation.

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Cited by 3 publications

References 1 publication

Conductivity of ScSZ Ceramics in Vicinity of Polymorphic Phase Transitions

Conductivity of ScSZ Ceramics in Vicinity of Polymorphic Phase Transitions

Anisotropy of Mechanical Properties of Zirconia-Based Ceramics Tested for Bending

Thin‐wall ceramic CAD/CAM crown copings: strength and fracture pattern

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