Patent ID: 8741791

Claim:
A method for manufacturing a crystallized glass with negative coefficient of thermal expansion, comprising (a) weighing and mixing compositions; (b) calcining the mixed compositions; (c) sintering the calcined compositions; and (d) slow-cooling the sintered compositions; wherein the compositions includes 38 wt % to 64 wt % of silica (SiO 2 ), 30 wt % to 40 wt % of alumina (Al 2 O 3 ), and 5 wt % to 12 wt % of lithium oxide (Li 2 O) 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 2 ), 0.5 wt % to 6.5 wt % of titanium dioxide (TiO 2 ), 0.5 wt % to 4 wt % of phosphorus pentoxide (P 2 O 5 ), and 0.1 wt % to 5 wt % of magnesium fluoride (MgF 2 ) in addition to any other components.