Porous yttria‐Stabilized Zirconia Ceramics Fabricated by Nonaqueous‐Based Gelcasting Process with <scp>PMMA</scp> Microsphere as Pore‐Forming Agent

Zhou, Jun; Wang, Chang‐An

doi:10.1111/jace.12074

Cited by 56 publications

(22 citation statements)

References 28 publications

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“…Also, our data show that the compressive strength values of the ceramics are similar to the values of human cortical bone . 6 The elastic modulus, a measure of stiffness, was measured at 10 GPa for YSZ and 6 GPa for MgSZ alumina, also within the mechanical properties reported for cortical bone (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20). 25 In vitro cell investigation Scanning electron microscopy analysis.…”

Section: Characterization Of Ysz and Mgsz Porous Ceramicssupporting

confidence: 64%

“…10 Among zirconia ceramics, the most studied and widely used is yttria-stabilized zirconia (YSZ) with excellent resistance to crack propagation. 11,12 On the other hand, magnesiastabilized zirconia (MgSZ) also exhibits high mechanical strength, excellent corrosion resistance and good biocompatibility. Furthermore, it does not experience phase transformation and it has been shown to better resist degradation in vivo.…”

Section: Introductionmentioning

confidence: 99%

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Proliferation and osteogenic response of MC3T3‐E1 pre‐osteoblastic cells on porous zirconia ceramics stabilized with magnesia or yttria

Hadjicharalambous

Mygdali

Prymak

et al. 2015

J Biomedical Materials Res

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Dense zirconia ceramics are used in bone applications due to their mechanical strength and biocompatibility, but lack osseointegration. A porous interface in contact with bone tissue may lead to better bone bonding but the biological properties of porous zirconia are not widely explored. The present study focuses on the manufacturing of an yttria- (YSZ) and a magnesia-stabilized (MgSZ) porous zirconia, and on their in vitro biological investigation. The sintered ceramics had similar characteristics of porosity, pore size and interconnectivity. Their elastic moduli and compressive strength values were within the range of the values of human cortical bone. MC3T3-E1 pre-osteoblasts were used to investigate the proliferation, alkaline phosphatase (ALP) activity, collagen deposition and expression profile of four genes involved in bone metabolism of cells on porous ceramics. Scanning electron and fluorescence microscopy were employed to visualize cell morphology and growth. Pre-osteoblasts adhered well on both ceramics but cell numbers on YSZ were higher. Cells exhibited an increase in ALP activity and collagen deposition after 14 days on both MgSZ and YSZ, with higher levels on YSZ. Real-time quantitative polymerase chain reaction (qPCR) showed that the expression of bone sialoprotein (Bsp) and collagen type I (col1aI) were significantly higher on YSZ. No significant differences were found in their ability to regulate the early gene expression of Runx2 and Alp. Nevertheless, the biomineralized calcium content was similar on both ceramics after 21 days, indicating that despite chemical differences, both scaffolds direct the pre-osteoblasts toward a mature state capable of mineralizing the extracellular matrix.

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Section: Characterization Of Ysz and Mgsz Porous Ceramicssupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Proliferation and osteogenic response of MC3T3‐E1 pre‐osteoblastic cells on porous zirconia ceramics stabilized with magnesia or yttria

Hadjicharalambous

Mygdali

Prymak

et al. 2015

J Biomedical Materials Res

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“…When porosity increased from 72% to 89%, σ c decreased from 13.31 to 0.59MPa. With a porosity of 72%, σ c of 13.3MPa in this work was comparable with the value of 14.6MPa for the porous zirconia using powder as raw material 13 , indicating the relatively stronger mechanical strength. The σ c -porosity relation was fitted using an exponential equation of y=Aexp(-Bx)+C.…”

Section: B Porositysupporting

confidence: 72%

Thermophysical and mechanical properties of zirconia fibrous ceramics for thermal protection

Sun¹,

Zhou²,

Song³

et al. 2015

20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference

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Zirconia fibrous ceramics with high porosity (porosity=70-90%) were fabricated and investigated for high-temperature thermal protection applications. Two types of zirconia fibers, tetragonal and cubic phases, were compared. The results showed that the ceramics made of cubic-phase fibers had lower room-temperature thermal conductivity and lower mechanical strength. In addition, the effects of fiber diameter on the properties were also studied. Using the fibers with smaller diameter, the sample's thermal conductivity decreased, but the compressive strength also decreased slightly. It was found that the ceramics' room-temperature thermal conductivity and mechanical strengths varied with porosity linearly or exponentially, respectively. The ceramics' thermal expansion and thermal capacity in the range of RT~900 were measured. The high ℃ ℃ ℃ ℃ -temperature insulation performance was evaluated by back temperature tests. Finally, the porous ceramics were impregnated with aerogels. The room-temperature as well as high-temperature thermal conductivities both decreased. Therefore, the zirconia fibrous ceramics is a promising candidate for high-temperature insulation applications. Nomenclature ρ = density λ RT = room-temperature thermal conductivity λ HT = high-temperature thermal conductivity σ c = compressive strength σ t = tensile strength α = average linear thermal expansion C p = average thermal capability

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“…However, the shape and size of pores are difficult to adjust by these poreforming agents. The distribution of the spherical pores produced from PMMA microspheres is more uniform (Liu & Wang, 2013;Tang et al, 2004;Zhang, Li, & Zhang, 2007;Zhou & Wang, 2013). In particular, the pore size can be controlled by different sizes of PMMA.…”

Section: Introductionmentioning

confidence: 99%

Effect of platinum on sintering morphology of porous YSZ ceramics

Fang

Wang

et al. 2017

Microscopy Res & Technique

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Platinum/yttria-stabilized zirconia (Pt/YSZ) porous ceramics were prepared by sintering of the Pt/PMMA/YSZ stripe-like membrane with a porogen of spherical polymethyl methacrylate (PMMA) and a precursor of platinum (Pt) of chloroplatinic acid. The microstructure of raw and processed material and Pt/ZrO calcination process at different sintering temperatures were investigated. The results showed that the spherically porous structure of Pt/YSZ was observed at a sintering temperature below 400 °C due to the thermal decomposition of PMMA. However, the pores were shrunk about 35% in diameter when YSZ compacts were sintered at the temperature of 1,450 °C. In addition, the spherical pores can be retained in the compacts when the content of Pt <5% and then gradually merged into changing when the content of Pt increased to 50%. The relative density was increased from 42% to 90% and the open porosity was decreased from 60% to 10% when Pt was added with content from 5% to 80%. The change of microstructure for Pt/YSZ is due to the migration of Pt and YSZ in the composites. The preferential migration and coalescence proceeded for Pt in Pt/YSZ is about 500 °C and YSZ clusters can keep stable until up to 900 °C. However, the growth of YSZ particle in the sintering process was hindered by the scattering of Pt phase.

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Porous yttria‐Stabilized Zirconia Ceramics Fabricated by Nonaqueous‐Based Gelcasting Process with PMMA Microsphere as Pore‐Forming Agent

Cited by 56 publications

References 28 publications

Proliferation and osteogenic response of MC3T3‐E1 pre‐osteoblastic cells on porous zirconia ceramics stabilized with magnesia or yttria

Proliferation and osteogenic response of MC3T3‐E1 pre‐osteoblastic cells on porous zirconia ceramics stabilized with magnesia or yttria

Thermophysical and mechanical properties of zirconia fibrous ceramics for thermal protection

Effect of platinum on sintering morphology of porous YSZ ceramics

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