Claims
- 1. The method of making a resistor element containing a pyrochlore-related compound corresponding to the formula
- Sn.sub.2-x.sup.2+ Ta.sub.y.sbsb.3 Nb.sub.y.sbsb.2 Sn.sub.y.sbsb.1.sup.4+ O.sub.7-x-y.sbsb.1.sub./2
- wherein
- x=0-0.55
- y.sub.3 =0-2
- y.sub.2 =0-2
- y.sub.1 =0-0.5 and
- y.sub.1 +y.sub.2 +y.sub.3 =2,
- comprising the sequential steps of
- (a) forming a dispersion in organic medium of finely divided particles of SnO, SnO.sub.2, a metal pentoxide selected from the group consisting of Ta.sub.2 O.sub.5, Nb.sub.2 O.sub.5 and mixtures thereof and inorganic binder having a sintering temperature of below 900.degree. C., the mole ratio of SnO to metal pentoxide being 1.4-3.0, the SnO.sub.2 being in stoichiometric excess of the SnO and metal pentoxide and comprising 20-95% by weight of the total oxides and the inorganic binder comprising 5-45% by weight of the solids content of the dispersion;
- (b) forming a patterned thin layer of the dispersion of step (a);
- (c) drying the layer of step (b); and
- (d) firing the dried layer of step (c) in a nonoxidizing atmosphere to effect volatilization of the organic medium and liquid phase sintering of the inorganic binder.
- 2. The method of making a resistor element comprising the sequential steps of
- (a) forming a dispersion in organic medium of finely divided particles of a pyrochlore corresponding to the formula
- Sn.sub.2-x.sup.2+ Ta.sub.y.sbsb.3 Nb.sub.y.sbsb.2 Sn.sub.y.sbsb.1.sup.4+ O.sub.7-x-y.sbsb.1.sub./2
- wherein
- x=0-0.55
- y.sub.3 =0-2
- y.sub.2 =0-2
- y.sub.1 =0-0.5 and
- y.sub.1 +y.sub.2 +y.sub.3 =2,
- 20-95% by weight SnO.sub.2, basis pyrochlore.sup.(1) and SnO.sub.2 and inorganic binder, the inorganic binder being 5-45% by weight of the solids content of the dispersion;
- (b) forming a patterned thin layer of the dispersion of step (a);
- (c) drying the layer of step (b); and
- (d) firing the dried layer of step (c) in a nonoxidizing atmosphere to effect volatilization of the organic medium and liquid phase sintering of the inorganic binder.
- 3. A screen-printable thick film resistor composition comprising a dispersion in organic medium of finely divided particles of SnO, SnO.sub.2, a metal pentoxide selected from the group consisting of Ta.sub.2 O.sub.5, Nb.sub.2 O.sub.5 and mixtures thereof and inorganic binder having a sintering temperature of below 900.degree. C., the mole ratio of SnO to metal pentoxide being 1.4-3.0, the SnO.sub.2 being in stoichiometric excess of the SnO and metal pentoxide and comprising 20-95% by weight of the total oxides.
- 4. A screen-printable thick film resistor composition comprising a dispersion in organic medium of an admixture of finely divided particles of a pyrochlore corresponding to the formula
- Sn.sub.2-x.sup.2+ Ta.sub.y.sbsb.3 Nb.sub.y.sbsb.2 Sn.sub.y.sbsb.1.sup.4+ O.sub.7-x-y.sbsb.1.sub./2
- wherein
- x=0-0.55
- y.sub.3 =0-2
- y.sub.2 =0-2
- y.sub.1 =0-0.5 and
- y.sub.1 +y.sub.2 +y.sub.3 =2,
- 20-95% by weight SnO.sub.2, basis pyrochlore and SnO.sub.2 and inorganic binder, the inorganic binder being from 5-45% by weight of the solids content of the dispersion.
- 5. The screen-printable composition of claim 4 in which the inorganic binder is a Bi-, Cd- and Pb-free frit comprising by mole % 10-50% SiO.sub.2, 20-60% B.sub.2 O.sub.3, 10-35% BaO, 0-20% CaO, 0-15% MgO, 0-15% NiO, 0-15% Al.sub.2 O.sub.3, 0-5% SnO.sub.2, 0-7% ZrO.sub.2 and 0-5% of a metal fluoride in which the metal is selected from the group consisting of alkali metals, alkaline earth metals and nickel, the mole ratio ##EQU5## is 0.8-4, the total of BaO, CaO, MgO, NiO and CaF.sub.2 is 15-50 mole % and the total of Al.sub.2 O.sub.3, B.sub.2 O.sub.3, SiO.sub.2, SnO.sub.2 and ZrO.sub.2 is 50-85mole %.
- 6. The screen-printable composition of claim 5 which contains 0-5% by weight basis binder solids of finely divided particles of a metal fluoride in which the metal is selected from the group consisting of alkali metals, alkaline earth metals and nickel.
- 7. A resistor comprising a patterned thin layer of the dispersion of the compositions of either claims 5 or 6 or mixtures thereof which has been dried and fired in a nonoxidizing atmosphere to effect volatilization of the organic medium and liquid phase sintering of the inorganic binder.
- 8. The screen-printable composition of claim 3 in which the inorganic binder is a Bi-, Cd- and Pb-free frit comprising by mole % 10-50% SiO.sub.2, 20-60% B.sub.2 O.sub.3, 10-35% BaO, 0-20% CaO, 0-15% MgO, 0-15% NiO, 0-15% Al.sub.2 O.sub.3, 0-5% SnO.sub.2, 0-7% ZrO.sub.2 and 0-5% of a metal fluoride in which the metal is selected from the group consisting of alkali metals, alkaline earth metals and nickel, the mole ratio ##EQU6## is 0.8-4, the total of BaO, CaO, MgO, NiO and CaF.sub.2 is 15-50 mole % and the total of Al.sub.2 O.sub.3, B.sub.2 O.sub.3, SiO.sub.2, SnO.sub.2 and ZrO.sub.2 is 50-85 mole %.
- 9. The screen-printable composition of claim 8 which contains 0-5% by weight basis binder solids of finely divided particles of a metal fluoride in which the metal is selected from the group consisting of alkali metals, alkaline earth metals and nickel.
- 10. A resistor comprising a patterned thin layer of the dispersion of the compositions of claims 3 or 7 or mixtures thereof which has been dired and fired in a nonoxidizing atmosphere to effect volatilization of the organic medium and liquid phase sintering of the inorganic binder.
CROSS REFERENCE TO PRIOR APPLICATION
This application is a divisional application of allowed U.S. patent application Ser. No. 460,572, filed Jan. 24, 1983, which is a continuation-in-part of U.S. patent application Ser. No. 383,452, filed June 1, 1982 and now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (2)
Number |
Date |
Country |
1063796 |
Oct 1979 |
CAX |
1665826 |
Feb 1977 |
DEX |
Divisions (1)
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Number |
Date |
Country |
Parent |
460572 |
Jan 1983 |
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Continuation in Parts (1)
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Number |
Date |
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Parent |
383452 |
Jun 1982 |
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