Effects of sintering curves on microstructure, physical and mechanical properties and on low temperature degradation of zirconia-toughened alumina

Zadorozhnaya, O. Yu.; Хабас, Т. А.; Kamyshnaya, K. S.; Kutugin, V. A.; Malykhin, S. E.

doi:10.1016/j.jeurceramsoc.2021.09.009

Cited by 6 publications

(4 citation statements)

References 32 publications

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“…The T 2 temperature was chosen following earlier studies. 28,45,46 It needs to be 100-150 • C lower than T 1 temperature. This study maintained temperature (T 2 ) between 1250 and 1400 • C, which is 100 • C lower than the T 1 temperature.…”

Section: Resultsmentioning

confidence: 99%

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Effect of two‐step sintering on microstructure and mechanical properties of ceria‐stabilized zirconia‐toughened alumina‐added titania (CSZTA–TiO₂)

Eggidi

Pandey

2022

Int J Applied Ceramic Tech

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Effect of two‐step sintering (TSS) on microstructure and mechanical properties of ceria‐stabilized zirconia‐toughened alumina with added TiO2 (CSZTA–TiO2) was studied. A coprecipitation technique was used to produce the CSZTA–TiO2 powders. The synthesized powders were compacted using a uniaxial hydraulic press and conventionally sintered in air. The phase and microstructure of sintered samples were studied using X‐ray diffraction and scanning electron microscopy techniques. Phases were quantified using the Rietveld refinement method. Different TSS schedules were followed to optimize microstructure and mechanical properties. Mechanical properties of the CSZTA‐4TiO2 composite were evaluated and found as follows: Vickers's hardness of 1650 ± 9.6 HV10, indentation fracture toughness of 8.45 ± .14 MPa √m, compressive strength of 2088 MPa, and Young's modulus of 158 GPa.

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Section: Resultsmentioning

confidence: 99%

“…In the second step, the material is heated to a lower temperature ( T 2 ), at which triple junctions inhibit the grain growth without affecting densification. The T 2 temperature was chosen following earlier studies 28,45,46 . It needs to be 100–150°C lower than T 1 temperature.…”

Section: Resultsmentioning

confidence: 99%

Effect of two‐step sintering on microstructure and mechanical properties of ceria‐stabilized zirconia‐toughened alumina‐added titania (CSZTA–TiO₂)

Eggidi

Pandey

2022

Int J Applied Ceramic Tech

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“…To improve its performance, incorporating a second ceramic phase allows the development of composites that enhance the lower properties of the alumina matrix. In this context, the composites of toughened alumina with tetragonal zirconia, ZTA 5,6 , are presented as a viable alternative since both phases have thermal stability and biocompatibility.…”

Section: Introductionmentioning

confidence: 99%

Four-Point Bending Fatigue Behavior of Al2O3-ZrO2 Ceramic Biocomposites Using CeO2 as Dopant

et al. 2022

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This work investigated the effect of adding ceria-stabilized tetragonal zirconia (Ce-TZP) on the fatigue behavior of alumina-based ceramic composites. Alumina powder (control group) and mixtures containing 5 wt.% (group A) and 20 wt.% (group B) of a commercial m-ZrO 2 /Al 2 O 3 /CeO 2 powder mixture were milled/homogenized, compacted, sintered at 1600°C-2h, and submitted to hydrothermal degradation. The samples were characterized by relative density, microstructure, crystalline phases, and static mechanical properties. The cyclic fatigue strength was determined using the modified staircase method in 4-point bending tests. The results indicate that adding the m-ZrO 2 /Al 2 O 3 /CeO 2 powder mixture to the Al 2 O 3 -matrix increases the tetragonal-ZrO 2 grains (Ce-TZP) content, presenting 2.9 wt.% of Ce-TZP and 11.9 wt.% of Ce-TZP for group A and group B, respectively. Furthermore, the addition of Ce-TZP improves densification (98.5% → 99.1%) with a slight reduction in hardness and modulus of elasticity and a significant K IC increase of the composite (K IC = 6.7 MPa.m 1/2 , group B) when compared to monolithic alumina (K IC =2.4 MPa.m 1/2 ). The fatigue strength limit of the control group was around 100 MPa, while the composites (groups A and B) presented the values of 279 MPa and 239 MPa, respectively. The results indicated that the incorporation of Ce-TZP significantly improves the fracture toughness of alumina-based ceramics. On the other hand, regarding the fatigue behavior, there was an increase in fatigue resistance in group A, resulting from the benefits of the t→m Ce-TZP grains transformation, which occurs during cyclic loading, producing a zone shielding that involves the tip of the crack, slowing its growth. The increase in the amount of Ce-TZP (group B) leads to an increase in the internal residual stresses between the phases due to anisotropy and difference in the thermal expansion coefficients, which accelerates the phase transformation and formation of microcracks at grain boundaries, reducing the fatigue strength of composites of group B.

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“…Among several ways commonly used to obtain ceramic composites from physical mixtures of powders, it is necessary to highlight the importance of the development of these mixtures, namely the control certain parameters as powder nature and amount, considering distinct and stable ceramics at elevated temperatures. For example, in the case of Al 2 O 3 and yttria-stabilized zirconia Y-TZP (composites), zirconia-toughened alumina (ZTA) or alumina-reinforced zirconia ceramics (ATZ, aluminatoughened zirconia) could be attained depending on their proportions [7,8]. In another type of composites, constituent materials can chemically react at elevated temperatures in a process of phases transformation "in situ", called "reactive sintering" [9,10], resulting in different crystalline phases after sintering, as, for example, in the binary ceramic system Al 2 O 3 -Y 3 O 2 , where crystalline phases, such as YAG (Y 3 Al 15 O 12 ), YAP (YAlO 3 ), or YAM (Y 4 Al 12 O 9 ), can be formed.…”

Section: Introductionmentioning

confidence: 99%

Reactive Sintering of Al2O3–Y3Al5O12 Ceramic Composites Obtained by Direct Ink Writing

et al. 2021

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The main goal of this work was to obtain dense Al2O3–Y3Al5O12 ceramic composites by reactive sintering of three-dimensional samples, built by direct ink writing from a paste containing a mixture of Al2O3 and Y2O3 powders. To obtain a ceramic ink with proper rheological properties for extrusion-based printing, highly pure Al2O3 and Y2O3 powders in a percentage–weight ratio of 64:36 was mixed with 0.2 wt% MgO in a total solid loading of 42 vol% in aqueous media, adding carboxymethyl cellulose and polyethyleneimine solution as additives. The dried printed samples were sintered at final temperatures in the range of 1550 °C and 1650 °C; thus, relative densities of 83.7 ± 0.8%, 95.4 ± 0.4%, and 96.5 ± 0.5% were obtained for 1550 °C, 1600 °C, and 1650 °C, respectively. Rietveld refinement performed on the X-ray diffraction patterns indicated the presence of Al2O3 (42 to 47%) and Y3Al15O12 (58 to 61%) as crystalline phases, while micrographs showed the presence of equiaxial micrometric grains with average sizes of 1.8 ± 0.6 μm, for both phases and all sintering conditions. Samples sintered at 1600 °C and 1650 °C presented similar average Vickers hardness values of 14.2 ± 0.27 GPa and 14.5 ± 0.25 GPa, respectively. A slight increase in fracture toughness as sintering temperature increases was also stated, consistent with the densification.

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Effects of sintering curves on microstructure, physical and mechanical properties and on low temperature degradation of zirconia-toughened alumina

Cited by 6 publications

References 32 publications

Effect of two‐step sintering on microstructure and mechanical properties of ceria‐stabilized zirconia‐toughened alumina‐added titania (CSZTA–TiO₂)

Effect of two‐step sintering on microstructure and mechanical properties of ceria‐stabilized zirconia‐toughened alumina‐added titania (CSZTA–TiO₂)

Four-Point Bending Fatigue Behavior of Al2O3-ZrO2 Ceramic Biocomposites Using CeO2 as Dopant

Reactive Sintering of Al2O3–Y3Al5O12 Ceramic Composites Obtained by Direct Ink Writing

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Effects of sintering curves on microstructure, physical and mechanical properties and on low temperature degradation of zirconia-toughened alumina

Cited by 6 publications

References 32 publications

Effect of two‐step sintering on microstructure and mechanical properties of ceria‐stabilized zirconia‐toughened alumina‐added titania (CSZTA–TiO2)

Effect of two‐step sintering on microstructure and mechanical properties of ceria‐stabilized zirconia‐toughened alumina‐added titania (CSZTA–TiO2)

Four-Point Bending Fatigue Behavior of Al2O3-ZrO2 Ceramic Biocomposites Using CeO2 as Dopant

Reactive Sintering of Al2O3–Y3Al5O12 Ceramic Composites Obtained by Direct Ink Writing

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Effect of two‐step sintering on microstructure and mechanical properties of ceria‐stabilized zirconia‐toughened alumina‐added titania (CSZTA–TiO₂)

Effect of two‐step sintering on microstructure and mechanical properties of ceria‐stabilized zirconia‐toughened alumina‐added titania (CSZTA–TiO₂)