Effect of frit size on sintering, crystallization and electrical properties of wollastonite glass-ceramics |
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Authors: | M Mohammadi Z Atlasbaf |
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Institution: | School of Engineering, Tarbiat Modares University, Tehran, Iran |
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Abstract: | Wollastonite glass-ceramics were prepared through pressureless sintering. The sinterability of the prepared samples of the glassy powder in the system (SiO2-CaO-Na2O-Fe2O3-WO3) was investigated in the temperature range 720-900 °C and soaking time of 180 min. The influence of the increase in the glass powder particle size on the sinterability and dielectric properties of the glass-ceramic samples was studied.The sintered specimens were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) methods. XRD analysis revealed that wollastonite was the main crystalline phase in the sintered glass-ceramics. Dielectric properties such as dielectric constant and dielectric loss were measured via a network analyzer at 10 GHz.It was observed that the increase of the glassy powder particle size improved the sinterability and dielectric properties of the glass-ceramic specimens. Wollastonite glass-ceramics with 16 μm particle size had maximum constant and minimum loss (εr = 10.10 and tan δ = 0.005) compared with the other glass-ceramics. |
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Keywords: | Glass-ceramics Dielectric properties Electron microscopy Sintering Substrates |
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