Patent ID: 7211533

Claim:
An oxide porcelain composition comprising: 100 parts by weight of an oxide porcelain composition serving as a main component; and about 3 parts by weight or less of at least one oxide serving as an additional component selected from CaO, MgO, ZnO, and SrO; wherein the oxide porcelain composition comprises about 11.5 weight percent to 60.0 weight percent of Al, in the form of Al 2 O 3 ; about 4.0 weight percent to 70.0 weight percent of Si, in the form of SiO 2 ; about 4.0 weight percent to 40.0 weight percent of Ba, in the form of BaO; about 1.0 weight percent to 30.0 weight percent of B, in the form of B 2 O 3 ; and about 0.3 weight percent to 3.0 weight percent of Cr, in the form of Cr 2 O 3 .