Porous stabilized zirconia coatings on zircon using volatility diagrams

Barreiro, P.; Rey, P.; Souto, Alejandro; Guitián, Francisco

doi:10.1016/j.jeurceramsoc.2008.07.018

Cited by 8 publications

(8 citation statements)

References 8 publications

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“…Zirconia slurry was infiltrated into the templates to obtain the porous structures. After drying in air for two days for pyrolysis of the organic phases, the sintering was carried out at 1400°C for 2 hours [3,[7][8]. A slow heating rate of 1 °C/min was used up to 700°C to burn out the ABS and minimize the cracking due to thermal expansion.…”

Section: Bpreparation Of Abs Scaffold Templatesmentioning

confidence: 99%

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Preparation of Mesoporous Bioglass Coated Zirconia Scaffold for Bone Tissue Engineering

Lin

Chen

Zheng³

et al. 2011

AMR

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Porous yttria-stabilized zirconia (YSZ) has been regarded as a potential candidate for bone substitute due to its high mechanical strength. However, porous YSZ is biologically inert to bone tissue. It is therefore necessary to introduce bioactive coatings onto the walls of the porous structures to enhance its bioactivity. In this study, porous YSZ scaffolds were prepared using a replication technique and then coated with mesoporous bioglass due to its excellent bioactivity. The microstructures were examined using scanning electron microscopy and the mechanical strength was evaluated via compression test. The biocompatibility and bioactivity were also evaluated using bone marrow stromal cell (BMSC) proliferation test and simulated body fluid test.

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Section: Bpreparation Of Abs Scaffold Templatesmentioning

confidence: 99%

“…A slow heating rate of 1 °C/min was used up to 700°C to burn out the ABS and minimize the cracking due to thermal expansion. Then, 5°C/min heating rate was used to 1400°C [8] to form the porous scaffolds.…”

Section: Bpreparation Of Abs Scaffold Templatesmentioning

confidence: 99%

Preparation of Mesoporous Bioglass Coated Zirconia Scaffold for Bone Tissue Engineering

Lin

Chen

Zheng³

et al. 2011

AMR

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“…A volatility diagram [2,[14][15][16][17][18][19] plots the vapor pressure of the predominant gaseous species in equilibrium with the various condensed phases as a function of oxygen partial pressure and temperature, so it is appropriate for understanding the oxidation behaviors of UHTCs when more than one gaseous species is involved. Thermodynamic calculations have been conducted on the volatility diagrams by Lou and coworkers [15,16] to study the gas-solid interactions for material systems such as Mg-O, Al-O, Si-O, Si-N, Si-N-O and Si-C-O.…”

Section: Introductionmentioning

confidence: 99%

“…Thermodynamic calculations have been conducted on the volatility diagrams by Lou and coworkers [15,16] to study the gas-solid interactions for material systems such as Mg-O, Al-O, Si-O, Si-N, Si-N-O and Si-C-O. In addition, volatility diagrams have been used to reveal significant insight into the oxidation behaviors for B, [2] Zr, [2,19] ZrB 2 , [14] SiC, [17] ZrB 2 -SiC, [18] and ZrSiO 4 [19] in extremely high-temperature environments. However, up to now, the volatility diagram for HfB 2 has not been reported.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Calculation of HfB2 Volatility Diagram

Zhang

Zeng

et al. 2011

J. Phase Equilib. Diffus.

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The thermodynamics of the oxidation of HfB 2 at temperatures of 1000, 1500, 2000, and 2500 K have been studied using volatility diagrams. Both the equilibrium oxygen partial pressure (P O 2 ) for the HfB 2 (s) to HfO 2 (s) plus B 2 O 3 (l) and the partial pressures of B-O vapor species formed due to B 2 O 3 (l) volatilization increase with increasing temperature. Vapor pressures of the predominant gaseous species also increase with P O 2 . At 1000 K, the predominant vapor transition sequence is predicted be BO(g) fi B 2 O 2 (g) fi B 2 O 3 (g) fi BO 2 (g) with increasing P O 2 , and the predominant gas is BO 2 (g) with a pressure of 1.27310 26 Pa under the condition of P O 2 = 20 kPa. At higher temperatures of 1500, 2000, and 2500 K, the system undergoes vapor transitions in the same sequence of B(g) fi BO(g) fi B 2 O 2 (g) fi B 2 O 3 (g) fi BO 2 (g). Under the same condition of P O 2 = 20 kPa, the predominant vapor species is B 2 O 3 (g) with pressures of 2.38, 4.49310 3 , and 3.55310 5 Pa, respectively. Volatilization of B 2 O 3 (l) may produce porous HfO 2 scale, which is consistent with the experimental observations of HfB 2 oxidation in air. The present volatility diagram of HfB 2 shows that HfB 2 exhibits oxidation behavior similar to ZrB 2 , and factors other than volatility of gaseous species affect the oxidation rate.

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“…A method for production of porous zirconia layers on zircon has been presented previously [3], through the reduction of silica to SiO (g) at high temperatures and low oxygen pressure:…”

Section: Introductionmentioning

confidence: 99%