Crystalline glass composition for use in circuit board sintered crystalline glass insulator composition insulating paste and thick film circuit board

摘要

That the present invention is sintered at a temperature not higher than 1100 ℃, and the relative dielectric constant of the service 12 or less, the crystallized glass composition for a circuit board having a preferred characteristic as an electrical insulating material for the thermal expansion coefficient is 12ppm / ℃ or more, a circuit board, glass composition for a circuit board according to the present invention, SiO _2, MgO, above which includes CaO, expressed as a weight% SiO _2, MgO, that the composition ratio of CaO, 3-component phase diagram of Figure 1 a (25, 45, 30), point B (25, 0, 75), point C (44, 0, 56), point D (44, 22, 34), point E (40, 19, 41) and point F (29, 40, 31) is within the connecting surrounded by a line area, by heat-treating the composition, melwi nitro, Monticello light and calcium is adapted to separate out at least a crystal phase of one kind of silicate, the thermal expansion coefficient of the powder formed of the glass composition 6.0 there happened the addition of the ceramic powder over ppm / ℃.