Jeongkwan Co., Ltd

Duck Ki Yoon

Ki Hwan Kim

Hyung Lim

Tae Heung Kim

Kang Taek Lee

A crystallized glass with negative coefficient of thermal expansion includes 38 wt % to 64 wt % of silica (SiO); 30 wt % to 40 wt % of alumina (AlO); and 5 wt % to 12 wt % of lithium oxide (LiO) as a basic component, and further includes more than one component selected from the group consisting of 0.5 wt % to 15 wt % of zirconia (ZrO), 0.5 wt % to 6.5 wt % of titanium dioxide (TiO), 0.5 wt % to 4 wt % of phosphorus pentoxide (PO), 2 wt % to 5 wt % of magnesium oxide (MgO), and 0 wt % to 5 wt % of magnesium fluoride (MgF) in addition to the basic components. The crystallized glass may have a high negative coefficient of thermal expansion so that it has an advantage that it can be used as a thermal expansion compensation material according to the temperatures of all kinds of glasses and similar products thereof.

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Busan, South Korea

Duck Ki Yoon