In this paper the capability of surface nucleated barium and strontium feldspars glass-ceramics of being sintered was investigated by means of density and porosity measurements, X-ray diffraction measurements, microscopic observations and indentation testing and the results compared with those recorded on the corresponding bulk crystallized samples. The densification degree, higher than 95% of the theoretical density, and the favoured formation of thermally stable crystalline phases, such as celsian and Sr-celsian, with respect to those which present non-linear thermal expansion, hexacelsian, make sintering very useful for the production of low porosity, less than 3 vol%, materials. The microhardness values (470-780 Kg/mm2) and elastic modulus (57-115 GPa) of the sintered glass-ceramics, together with the refractoriness of the developed phases make these systems particularly suitable for structural applications.
THE MICROSTRUCTURE AND MECHANICAL-PROPERTIES OF SINTERED CELSIAN AND STRONTIUM-CELSIAN GLASS-CERAMICS / Barbieri, Luisa; Corradi, Anna; Leonelli, Cristina; Manfredini, Tiziano; Romagnoli, Marcello; Siligardi, Cristina. - In: MATERIALS RESEARCH BULLETIN. - ISSN 0025-5408. - STAMPA. - 30 (1):(1995), pp. 27-41.
THE MICROSTRUCTURE AND MECHANICAL-PROPERTIES OF SINTERED CELSIAN AND STRONTIUM-CELSIAN GLASS-CERAMICS
BARBIERI, Luisa;CORRADI, Anna;LEONELLI, Cristina;MANFREDINI, Tiziano;ROMAGNOLI, Marcello;SILIGARDI, Cristina
1995
Abstract
In this paper the capability of surface nucleated barium and strontium feldspars glass-ceramics of being sintered was investigated by means of density and porosity measurements, X-ray diffraction measurements, microscopic observations and indentation testing and the results compared with those recorded on the corresponding bulk crystallized samples. The densification degree, higher than 95% of the theoretical density, and the favoured formation of thermally stable crystalline phases, such as celsian and Sr-celsian, with respect to those which present non-linear thermal expansion, hexacelsian, make sintering very useful for the production of low porosity, less than 3 vol%, materials. The microhardness values (470-780 Kg/mm2) and elastic modulus (57-115 GPa) of the sintered glass-ceramics, together with the refractoriness of the developed phases make these systems particularly suitable for structural applications.
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