Resistive material, and resistive paste and resistor comprising the material
AssigneeMurata Manufacturing Co., Ltd.
InventorsKeisuke Nagata, Hiroji Tani
Life of this patent
Estimating the term…
Abstract
An organic vehicle is added to and kneaded with a solid component comprising from 60 to 95% by weight of a resistive material having a composition of La.sub.x Sr.sub.1-x CoO.sub.3 (x is from 0.40 to 0.60) and from 5 to 40% by weight of glass frit to obtain a resistive paste. A substrate is coated with the resistive paste and fired to produce a resistor. The resistive paste can be fired in any of air, neutral and reducing atmospheres. The resistor has any desired resistance value within a broad range, and the reproducibility of the resistor with a desired resistance value is good.
Claims6
An electrically resistive paste comprising an organic vehicle and a solid component comprising from about 60 to 95% by weight of an electrically resistive material having a composition of the formula:
- La.sub.x Sr.sub.1-x CoO.sub.3
- wherein x is from about 0.40 to 0.60 and from about 5 to 40% by weight of glass frit selected from the group consisting of (a) a lead zinc borosilicate glass frit comprising from about 15 to 25 mol % of B.sub.2 O.sub.3, from about 40 to 50 mol % of SiO.sub.2, from about 15 to 25 mol % of PbO and from about 7 to 13 mol % of ZnO, and (b) a calcium barium borosilicate glass frit comprising from about 3 to 10 mol % of B.sub.2 O.sub.3, from about 35 to 45 mol % of SiO.sub.2, from about 25 to 35 mol % of CaO and from about 15 to 20 mol % of BaO.
A method of producing an electrically resistive paste having a predetermined resistivity value which comprises heating a material mixture of La, Sr and Co containing raw material substances at a temperature between about 800.degree. C. and 1150.degree. C. wherein said mixture of raw materials are present in such an amount that an electrically resistive material having a composition of the formula:
- La.sub.x Sr.sub.1-x CoO.sub.3
- wherein x is from about 0.40 to 0.60 is formed upon heating and combining said material with a glass frit selected from the group consisting of (a) a lead zinc borosilicate glass frit comprising from about 15 to 25 mol % of B.sub.2 O.sub.3, from about 40 to 50 mol % of SiO.sub.2, from about 15 to 25 mol % of PbO and from about 7 to 13 mol % of ZnO, and (b) a calcium barium borosilicate glass frit comprising from about 3 to 10 mol % of B.sub.2 O.sub.3, from about 35 to 45 mol % of SiO.sub.2, from about 25 to 35 mol % of CaO and from about 15 to 20 mol % of BaO.
Dependencies are inferred from the claim text.