Patent ID: 7351674

Claim:
An insulating ceramic composition comprising: a first ceramic powder comprising forsterite as a main component; a second ceramic powder comprising at least one ceramic powder selected from the group consisting of a calcium titanate-based ceramic powder mainly containing calcium titanate, a strontium titanate-based ceramic powder mainly containing strontium titanate, and a titanium oxide-based ceramic powder mainly containing titanium oxide; and borosilicate glass powder, wherein the borosilicate glass contains 3 to 15 percent by weight of lithium in terms of Li 2 O, 30 to 50 percent by weight of magnesium in terms of MgO, 15 to 30 percent by weight of boron in terms of B 2 O 3 , 10 to 35 percent by weight of silicon in terms of SiO 2 , 6 to 20 percent by weight of zinc in terms of ZnO, and 0 to 15 percent by weight of aluminum in terms of Al 2 O 3 .