Journal ArticleDOI
Synthesis of binary glass-forming oxide glasses by hot-pressing of gels
TLDR
In this paper, the viscosity-temperature relationship in the pressing temperature interval was determined for mixed gels of SiO 2 TiO 2, SiO O 2, P 2 O 5 and B 2 O 3 systems, which were prepared by sol-gel and/or hydrolysis and polycondensation of organometallic compounds.Abstract:
Mixed gels of SiO 2 TiO 2 , SiO 2 P 2 O 5 and SiO 2 B 2 O 3 systems were prepared by sol-gel and/or hydrolysis and polycondensation of organometallic compounds. The conversion of gel into glass was achieved by hot-pressing of the previously dehydrated gel. The kinetics of densification obey the WILLIAMS, ROGERS and MURPHY model; from this the viscosity-temperature relationship in the pressing-temperature interval was determined. The comparison of physical constants of glasses obtained from gels with those of glasses obtained by the OVPO method shows slight differences in some cases which may be ascribed to impurities or to the different thermal histories of the samples.read more
Citations
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Synthesis of glasses from gels: the problem of monolithic gels
TL;DR: In this paper, the conditions of gel formation which determine the structure of the wet gel are first examined, and it is shown that, among the various methods of obtaining monolithic gels, that based on the hypercritical evacuation of the solvent is the most reliable.
Journal ArticleDOI
Preparation of glass by sintering
TL;DR: In this article, a classification of sintering processes includes: (a) sinterting of premelted and pulverized glasses; (b) Sintering of chemically treated glass; (c) sinting without melting; (d) sincing with melting; and (e) Sincing without, or simultaneously with, melting.
Journal ArticleDOI
Glassy and crystalline systems from gels, chemical basis and technical application
TL;DR: In this paper, a review of other sol-gel fields, using literature and patents until 1982, is presented, including preforms for communication fibres, technical fibres drawn from solution (possibly, unsupported films), hollow spheres for nuclear fuels, catalytic effects and, last not least, coatings.
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Applications of the sol-gel process
TL;DR: The advantages and disadvantages of the sol-gel process are reviewed in this paper, where many factors governing the development of structure and microstructure during gelation and subsequent heating are mentioned.
Journal ArticleDOI
Gel technology in ceramics
TL;DR: The use of sol-gel techniques to prepare ceramic materials ranks high among those areas in ceramic science and technology which are changing most rapidly and which offer the greatest promise for outstanding improvements in both understanding and applications as mentioned in this paper.
References
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Journal ArticleDOI
Synthesis of glasses by hot-pressing of gels
TL;DR: In this paper, the synthesis of glasses by hot-pressing of gels was studied for pure SiO2, as well as for La 2O3-SiO2 and B2O3SiO 2 systems, and different methods of pressing were investigated; they influence the residual OH− content of resultant glasses.
Journal ArticleDOI
Binary Titania-Silica Glasses Containing 10 to 20 Wt% TiO2
TL;DR: In this paper, a series of glasses in the TiO2-SiO2 system were prepared by the flame hydrolysis boule process and showed structural rearrangements on heat treatment at temperatures as low as 750CEC (∼200° below the annealing point).
Journal ArticleDOI
A comparative study of “gels” and oxide mixtures as starting materials for the nucleation and crystallization of silicate glasses
TL;DR: In this paper, the phase separation, devitrification and micro-hardness of the above glasses were investigated in relation to the starting materials and the composition of the glasses, and the results showed that the glasses made from gels are more homogeneous than those made from oxide mixtures.