Correlations among sintering temperature, shrinkage, and open porosity of 3.5 YSZ/Al2O3 composites

Журавлев, В. Д.; Komolikov, Yu. I.; Ermakova, L. V.

doi:10.1016/j.ceramint.2016.01.204

Cited by 13 publications

(6 citation statements)

References 19 publications

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“…Only at the 1400 °C temperature was a decrease of t-ZrO 2 /m-ZrO 2 observed. It is interesting to note that the t-ZrO 2 /m-ZrO 2 ratio after sintering up to 1200 °C was very close to the one observed for the composites of Al 2 O 3 –3 mol %YSZ presented in [30]. …”

Section: Discussionsupporting

confidence: 80%

“…The effects of phase transformation on various Al 2 O 3 –ZrO 2 composites sintering was already discussed in the literature [10,30,59,60,61,62]. For example, Chen et al [10] found that shrinkage of Al 2 O 3 –ZrO 2 composites is related to the θ→α-Al 2 O 3 phase transformation taking place in the second step of sintering.…”

Section: Discussionmentioning

confidence: 99%

“…For the manufacture of Al 2 O 3 –ZrO 2 ceramics, it is crucial that a suitable sintering temperature is chosen. One study that illustrates this was conducted by Zhuravlev et al [30], who showed that the maximum density of Al 2 O 3 ceramics with partially stabilized ZrO 2 (3YSZ) was achieved during sintering at 1400–1500 °C. The density of composite decreased and the open porosity of the ceramic materials grew with increasing amount of Al 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

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Mechanism of Reduced Sintering Temperature of Al2O3–ZrO2 Nanocomposites Obtained by Microwave Hydrothermal Synthesis

et al. 2018

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A novel method to obtain Al2O3–ZrO2 nanocomposites is presented. It consists of the co-precipitation step of boehmite (AlO(OH)) and ZrO2, followed by microwave hydrothermal treatment at 270 °C and 60 MPa, and by calcination at 600 °C. Using this method, we obtained two nanocomposites: Al2O3–20 wt % ZrO2 and Al2O3–40 wt % ZrO2. Nanocomposites were characterized by Fourier transformed infrared spectroscopy, Raman spectroscopy, X-ray diffraction, and transmission electron microscopy. Sintering behavior and thermal expansion coefficients were investigated during dilatometric tests. The sintering temperatures of the nanocomposites were 1209 °C and 1231 °C, respectively—approximately 100 °C lower than reported for such composites. We attribute the decrease of the sintering temperature to the specific nanostructure obtained using microwave hydrothermal treatment instead of conventional calcination. Microwave hydrothermal treatment resulted in a fine distribution of intermixed highly crystalline nanoparticles of boehmite and zirconia. Such intermixing prevented particle growth, which is a factor reducing sintering temperature. Further, due to reduced grain growth, stability of the θ-Al2O3 phase was extended up to 1200 °C, which enhances the sintering process as well. For the Al2O3–20 wt % ZrO2 composition, we observed stability of the zirconia tetragonal phase up to 1400 °C. We associate this stability with the mutual separation of zirconia nanoparticles in the alumina matrix.

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Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanism of Reduced Sintering Temperature of Al2O3–ZrO2 Nanocomposites Obtained by Microwave Hydrothermal Synthesis

et al. 2018

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“…For the preparation of molding material, each produced powder with a preassigned composition was further mechanically activated with addition of PVC as a binder [23].…”

Section: Sample Preparation Procedures For Measurement Of Ltecmentioning

confidence: 99%

Dilatometric characteristics of weakly sintered ceramics

et al. 2022

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Thermal expansion of refractory ceramics CaZrO3, MgAl2O4, La2Zr2O7 and YSZ-12 was studied. The samples of the complex oxides were synthesized by solution combustion synthesis with glycine; the fuel:oxidant ratio was varied depending on the character of redox reaction. The linear thermal expansion coefficient (LTEC) of ceramics was measured on the samples with an initial density 23–52%. The maximal sinterability of 89–92% after 6 h annealing at 1550 °С was demonstrated by La2Zr2O7 and YSZ-12, and the minimal values (78–82%) – by CaZrO3 and MgAl2O4. All materials have close LTEC values, from 9.0 to 9.6·10–6 K–1.

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“…However, ZrO 2 is not bioactive and cannot chemically or biologically bond to bones 20 . The low cell affinity together with the high thermoshrinkage of ZrO 2 may limit its application in scaffold manufacturing and medical utilization 21 . On the other hand, SiO 2 has excellent cell and tissue affinities via the interaction of its silanol group with the calcium and phosphate ions in biological fluids 22 , 23 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced biomedical applicability of ZrO2–SiO2 ceramic composites in 3D printed bone scaffolds

Chang

Lin

Chang

et al. 2022

Sci Rep

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Zirconia (ZrO2) has been widely used in clinical applications, such as bone and dental implantation, because of its favorable mechanical properties and resistance to fracture. However, the poor cell affinity of ZrO2 for bone regeneration and tissue binding, as well as its shrinkage due to crystal phase transformation during heat treatment, limits its clinical use and processing plasticity. This study aims to investigate an appropriate ZrO2–SiO2 composite recipe for ceramic 3D printing processes that can strike a balance between the mechanical properties and cell affinity needed in clinical applications. Specimens with different ZrO2–SiO2 composite recipes were fabricated by a selective laser gelling method and sintered at temperatures ranging from 900 to 1500 °C. The S5Z5 composite, which consists of 50 wt% ZrO2, 35 wt% SiO2 and 15 wt% SiO2 sol, showed an appropriate compressive strength and bending strength of 82.56 MPa and 55.98 MPa, respectively, at a sintering temperature of 1300 °C. The shrinkage rate of the S5Z5 composite was approximately 5% when the sintering temperature was increased from 900 to 1500 °C. All composites exhibited no cytotoxicity after 144 h of MG63 cell incubation, and the S5Z5 composite exhibited the most obvious cell affinity among the composite recipes. From these results, compared with other composites, the S5Z5 composite was shown to possess mechanical properties and a cell affinity more comparable to those of natural human bone.

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Correlations among sintering temperature, shrinkage, and open porosity of 3.5 YSZ/Al2O3 composites

Cited by 13 publications

References 19 publications

Mechanism of Reduced Sintering Temperature of Al2O3–ZrO2 Nanocomposites Obtained by Microwave Hydrothermal Synthesis

Mechanism of Reduced Sintering Temperature of Al2O3–ZrO2 Nanocomposites Obtained by Microwave Hydrothermal Synthesis

Dilatometric characteristics of weakly sintered ceramics

Enhanced biomedical applicability of ZrO2–SiO2 ceramic composites in 3D printed bone scaffolds

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