Al2O3-Ta2O5-rich glass-ceramic with interconnected pores and its sintering

Potgieter, E.; Res, M. A.; Sigalas, Iakovos; Schönberger, H.; Bednarik, J.

doi:10.1007/bf01160797

Cited by 5 publications

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“…2, the presence of droplet-like microheterogeneities with a background of onset of phase separation similar to that reported by Vogel [1,3,6,8,10]. After heat treatment coarsening of the separated phases occurred as shown in Fig.…”

Section: Scanning Electron Microscopysupporting

confidence: 59%

“…Additions of 10 to 18 wt % Ta20 5 into a complicated Na20-BzO3-SbzO3-VzOs-Ta2Os-LazO3-TiO 2-ZrO 2 system resulted in phase separable and leachable porous glasses as reported by Reset al [5]. In a study of binary systems replacing SiO z in the phase separable and leachable Na20-B203-SiO 2 glasses Potgieter et al [6] reported on porosity and heat resistance of an AlzO3-TazOs-rich material. Schmid et al [7] continued the work on porous materials containing Ta2Os and provided an in-depth structural study of Na20-BzO3-SiOz-TazOs glass.…”

Section: Introductionmentioning

confidence: 70%

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Characterization and sintering of a porous glass-ceramic in the system Na2O-B2O3-Ta2O5

1991

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Substitution of SiO 2 in the ternary sodium borosilicate system with Ta20~ was found to produce glasses, which after heat treatment separated into immiscible microphases, one of which was water soluble. The structure of the leached material after heat treatment was a well developed low temperature form of Ta205. After firing at temperatures between 1100 and 1 550 ~ X-ray diffraction analysis showed the presence of low and high temperature forms of Ta20~ and of orthorhombic Na2TasO21. The high solubility of up to 40 wt% TasO s in the sodium-borate matrix resulting in clear glasses is of practical interest. The specific surface areas of the leached materials ranged between 5.54 and 35.57 m s g-1 while in an additionally AI203 doped material the value of 307 m sg-1 was measured. Mean pore radii of interconnected pores were calculated to be between 18.63 to 41.1 2 nm in the TasO5-rich materials while the additional AI203 doping decreased the value to 2.71 nm. A sintering temperature between 1 500 and 1 550 ~ is estimated from void volume measurements after a series of firing steps at temperatures between 11 00 and 1 550 ~ were undertaken.

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