作者: I. W. Donald , B. L. Metcalfe , A. E. P. Morris
DOI: 10.1007/BF01154109
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摘要: Lithium zinc silicate glasses can be used to prepare moderately high thermal expansion glass-ceramics, and these materials are ideally suited for the manufacture of hermetic seals both nickel-based superalloys stainless steel. On basis earlier work by present authors, one particular composition from lithium system was chosen detailed investigation. This contains Na2O B2O3 fluxing agents, together with P2O5 as primary nucleating agent. The crystallization kinetics resultant microstructures this have been studied a function heat-treatment parameters using differential analysis, dynamic mechanical scanning transmission electron microscopy, ambient high-temperature X-ray diffraction, small-angle neutron scattering. Indirect evidence analysis scattering suggests that nucleated glass is phase separated on very fine scale, order 16 nm. A number crystalline phases positively identified in heat-treated glasses, including cristobalite, quartz, tridymite, β1-Li2ZnSiO4 γo-Li2ZnSiO4, precise formed depending strongly parameters. influence transition metal oxide additions properties has also investigated, it shown kinetics, characteristics all affected additions. In particular, activation energy (which related efficiency) dependent ionic field strength ion species employed, being favoured solutes strength.