Claims
- 1. A conductive element comprising a nonconductive ceramic substrate having a conductive pattern affixed thereon by
- (a) printing thereon a patterned film of a screen-printable paste which is a dispersion in organic medium of a metallization comprising an admixture of finely divided particles of
- (1) 30-80% by weight noble metal or alloy thereof,
- (2) 1-20% by weight low melting, low viscosity glass,
- (3) 0.1-10% by weight inorganic metal oxide capable of reacting with Al.sub.2 O.sub.3 under firing conditions to form a spinel structure, and
- (4) organotitanate which is a source of positive titanium ions under firing conditions,
- (b) drying, and
- (c) firing the dried film to effect volatilization of the organic medium and liquid phase sintering of the glass.
- 2. A process for making conductors comprising
- (a) applying to a nonconductive substrate a patterned thick film of a screen-printable paste which is a dispersion in organic medium of a metallization comprising an admixture of finely divided particles of
- (1) 30-80% by weight noble metal or alloy thereof,
- (2) 1-20% by weight low melting, low viscosity glass,
- (3) 0.1-10% by weight inorganic metal oxide capable of reacting with Al.sub.2 O.sub.3 under firing conditions to form a spinel structure, and
- (4) an organotitanate which is a source of positive titanium ions under firing conditions,
- (b) drying the film, and
- (c) firing the dried film to effect volatilization of the organic medium and liquid phase sintering of the glass and noble metal or noble metal alloy.
- 3. The process of claim 2 in which the noble metal component of the metallization is an admixture of palladium and silver particles in a weight ratio of 0.06 to 1.5 Pd/Ag.
- 4. The process of claim 2 in which the glass is a bismuth-free lead germanate glass containing 50-80% wt. Pb.sub.3 O.sub.4 and 10-30% wt. GeO.sub.2.
- 5. The process of claim 2 in which the spinel-forming component is an oxide or oxide precursor of a divalent metal selected from the group consisting of Zn, Mg, Co, Ni, Fe, and Mn.
- 6. The process of claim 2 in which the organotitanate is an hydrolyzable metal alcoholate of titanium corresponding to the formula (AO).sub.4x-2y TiO.sub.y, in which A is C.sub.1-8 alkyl or a mixture of C.sub.1-8 alkyl and C.sub.1-8 acyl, O is an oxygen atom covalently bonded to two titanium atoms, x is an interger of 1 to 12, and y is O or an interger from 1 to 3.times./2.
Parent Case Info
This is a division, of application Ser. No. 289,113, filed Aug. 3, 1981, now U.S. Pat. No. 4,381,945.
US Referenced Citations (3)
Foreign Referenced Citations (3)
Number |
Date |
Country |
33979 |
Aug 1981 |
EPX |
2046385 |
Mar 1972 |
DEX |
772675 |
Apr 1957 |
GBX |
Non-Patent Literature Citations (2)
Entry |
Ken-React Bulletin No. KR-027807 Rev., "Titanate Coupling Agents for Filled Polymers", pp. ARM 1-49, Feb. 1978. |
Du Pont Bulletin No. E38961, "Physical and Chemical Properties", pp. 4-7, 37, 38, 45, Dec. 1980. |
Divisions (1)
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Number |
Date |
Country |
Parent |
289113 |
Aug 1981 |
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