Abstract
The microwave sintering of glass-ceramics, non-thermal microwave effect, and crystal growth mechanism remain important challenges in materials science. In this study, we focus on developing approaches to affect crystal growth in the glass network of glass-ceramics by microwave heating, rather than performing a single study on the crystal structure and type. Raman spectroscopy is used to detect the structure of the glass network. We demonstrated that the non-thermal microwave effect promoted the diffusion of metal ions, which promoted the aggregation and precipitation of metal ions in the glass network to form crystals. The samples produced by microwave heating contain more non-bridging oxygen bonds than conventional sintered samples; therefore, the non-thermal microwave effect has a depolymerization effect on the glass network of the sample. Under the influence of microwave field, many metal ions precipitate, which precipitates many crystal nuclei. In addition, many active metal ions are captured during the crystal nucleus growth, which shortens the sintering process of glass-ceramics.
Highlights
In the 1960s, microwaves were used to sinter materials [1]
The microstructure was evaluated by a field emission scanning electron microscopy (FESEM, SUPRA 55 FESEM) instrument (Carl Zeiss, Jena, Freistaat Thüringen, Germany), which was equipped with an Oxford energy dispersive spectrometer (EDS) analysis system
At the same sintering temperature, the the samples with shorter sintering time have denser microstructure and larger grains. This result shows samples with shorter sintering time have denser microstructure and larger grains. This result shows that the crystallization kinetics of glass-ceramics during nucleation and crystallization is enhanced that the crystallization kinetics of glass-ceramics during nucleation and crystallization is enhanced by the non-thermal microwave effect
Summary
In the 1960s, microwaves were used to sinter materials [1]. Many studies have shown that microwave sintering can greatly shorten the sample preparation process and accelerate crystal growth. Mahmoud [20], during the research on lithium disilicate glass-ceramics by microwave heating, characterized the glass network by Raman spectroscopy He determined that the microwave field promoted the transformation of. Li [21,22] has researched the microwave sintering of CaO-MgO-Al2 O3 -SiO2 (CMAS) glass-ceramics by Raman spectroscopy He determined that with an increase in heat treatment temperature, the characteristic band strength of each sample gradually increased. Raman spectroscopy is used as the main tool to study the effect of microwaves on the growth of crystals, research the effect of non-thermal microwaves on glass networks and alkali metal ions, and to explore their association in promoting crystallization
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