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A Change of Thermal Expansion Coefficient according to Li<sub>2</sub>O-added Porcelain for Dental Zirconia

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A Change of Thermal Expansion Coefficient according to Li 2 O-added Porcelain for Dental Zirconia

Han-Sok Yoon Jungang Dental Lab.

Zirconia(ZrO 2 ) has attracted much attention in science and technology because of its high refractive index, high melting temperature, hardness, low thermal conductivity and corrosion barrier properties. And it is widely used as the dental restoration material because of its esthetic appearance. In this research, we analyzed the particle size and composition of the imported dental porcelain for zirconia. And the glass frit was produced. To decrease the glass transition temperature and softening temperature of the glass frit, Li 2 O was added into it and the effect of Li 2 O on the firing temperature was researched. Then the glass which contains leucite crystal with a high coefficient of thermal expansion(CTE) was manufactured and it was mixed with the glass frit to control the CTE.

The phase composition were analyzed using the X-ray diffraction. The morphologies of the samples were observed by the scanning electron microscope.

The 4wt% Li 2 O-added glass frit has the optimal glass transition temperature and softening temperature. And 6 wt% leucite crystal was mixed with the glass frit to control the CTE. From the experimental results of crystallization, the crystal phase was found only leucite crystal.

Key words : porcelain, zirconia, leucite, thermal expansion coefficient, glass transition temperature, Li

2

O

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