| 摘要 |
In an article comprising a ceramic body fired at a comparatively low temperature and a circuit pattern attached to the body, the ceramic body is produced from a preselected composition comprising first powder of alumina and second powder of a vitreous material which comprises any one of MgO-Al2O3-SiO2, CaO-MgO-Al2O3-SiO2, CaO-Al2O3-SiO2 glass, CaO-Al2O3-SiO2-B2O3 glass, MgO-Al2O3-SiO2-B2O3 glass, and CaO-MgO-Al2O3SiO2-B2O3 glass. The ceramic body comprises coexistence of an alumina part, a noncrystallized part, and a crystallized part and exhibits an excellent moisture proof. The circuit pattern comprises an internal conductive pattern of Ag and an external conductive pattern of an alloy of Ag-Pd. A chromium component may be included in the internal and the external conductive patterns. External and internal resistor patterns are placed on and within the ceramic body with a high and a low precision. The internal resistor pattern can be adjusted by the use of a laser beam through a thin film included in the ceramic body. |
