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US3918980A Expired / Lapsed US ⏱️ 0.0 years remaining

Bonded solderable silver article, composition, and method of bonding silver to a ceramic substrate

Assignee: Electro Oxide Corp
•
Filing: 1974-02-15
•
Granted: 1975-11-11
•
Expires: 1994-02-15
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Abstract

Abstract A composition for a solderable silver article of manufacture as well as a method of bonding silver to a ceramic substrate which includes a total composition of silver, cadmium oxide, copper oxide, rhuthenium oxide and palladium. An initial mixture of between 1.0 - 6.0% by weight of the total composition of cadmium oxide and copper oxide is provided in a pre-determined weight ratios. The initial mixture is blended with between 1.0 - 8.0% of palladium powder and about 0.2 - 3.0% of rhuthenium oxide to form an intermediate mixture. Silver powder is then added to the intermediate mixture to form a total composition mixture. The total composition mixture is blended in an organic binder and applied to a ceramic substrate to form a pre-determined coating layer thickness. The coated ceramic article is introduced into an oven having an oxidizing atmosphere which is maintained within a temperature range of 900*C to 950*C. Copper oxide crystals impregnate the ceramic substrate and form a high strength bond between the silver layer and the ceramic substrate. The palladium in a combination with the rhuthenium oxide slows down scavenging of the silver when the coated ceramic substrate is soldered. The addition of the rhuthenium oxide has been found to allow a lower percentage of palladium to be added to the total composition than that which has been previously used while maintaining high solderability of the silver layer.

Inventors

  • 👤 Baynard R Smith
  • 👤 Arnold W Treptow

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 15:06
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/026; C09; C09D; C09D5/00; C09D5/24; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/125; C04B2237/126; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/40; C04B2237/408; C04B2237/50; C04B2237/72; H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092

Claims Analysis

Total Claims: 13
Claim 1
Independent Claim 124 words
A METALLIZING COMPOSITION COMPRISING AN INTIMATE MIXTURE ON A WEIGHT BASIS, OF: (A) ABOUT 1.0-6.0 PERCENT OF A INITIAL MIXTURE OF CADMIUM OXIDE POWER AND AT LEAST ONE COPPER OXIDE POWER SELECTED FROM THE GROUP CONSISTING OF CUPROUS OXIDE AND CUPRIC OXIDE, SAID COPPER OXIDE AND CADMIUM OXIDE BEING COMBINED IN A WEIGHT RATIO OF BETWEEN 1.0-5.0 PARTS OF SAID COPPER OXIDE TO 1.0 PARTS OF SAID CADMIUM OXIDE: B) ABOUT 1.0-8.0 PERCENT OF PALLADIUM POWER (C) ABOUT 0.2-3.0% OF RHUTHENIUM OXIDE: (D) THE BALANCE OF SAID INTIMATE MIXTURE BEING AT LEAST ONE SILVER PARTICULATE MATERIAL SELECTED FROM THE GROUP CONSISTING OF SILVER AND SILVER OXIDE: AND, (E) ABOUT 10.0-60.0 PERCENT BY WEIGHTOF SAID INITIMATE MIXTURE OF AN ORGANIC BINDER DEVOID OF GLASS FRITS.
Claim 2
Dependent Claim 124 words
A METALLIZING COMPOSITION COMPRISING AN INTIMATE MIXTURE ON A WEIGHT BASIS, OF: (A) ABOUT 1.0-6.0 PERCENT OF A INITIAL MIXTURE OF CADMIUM OXIDE POWER AND AT LEAST ONE COPPER OXIDE POWER SELECTED FROM THE GROUP CONSISTING OF CUPROUS OXIDE AND CUPRIC OXIDE, SAID COPPER OXIDE AND CADMIUM OXIDE BEING COMBINED IN A WEIGHT RATIO OF BETWEEN 1.0-5.0 PARTS OF SAID COPPER OXIDE TO 1.0 PARTS OF SAID CADMIUM OXIDE: B) ABOUT 1.0-8.0 PERCENT OF PALLADIUM POWER (C) ABOUT 0.2-3.0% OF RHUTHENIUM OXIDE: (D) THE BALANCE OF SAID INTIMATE MIXTURE BEING AT LEAST ONE SILVER PARTICULATE MATERIAL SELECTED FROM THE GROUP CONSISTING OF SILVER AND SILVER OXIDE: AND, (E) ABOUT 10.0-60.0 PERCENT BY WEIGHTOF SAID INITIMATE MIXTURE OF AN ORGANIC BINDER DEVOID OF GLASS FRITS.
Claim 3
Dependent Claim 28 words
The metallizing composition as recited in claim 1 wherein said weight percentage of said rhuthenium oxide is within the approximate range between 1.0-3.0 percent of said intimate mixture.
Claim 4
Dependent Claim 16 words
The metallizing composition as recited in claim 2 wherein said copper oxide powder is cuprous oxide.
Claim 5
Dependent Claim 35 words
The metallizing composition as recited in claim 3 wherein said weight percentage of said initial mixture of said cadmium oxide and said copper oxide is within the approximate range between 2.0-4.0% of said intimate mixture.
Claim 6
Dependent Claim 37 words
The metallizing composition as recited in claim 4 wherein said weight ratio of said copper oxide and said cadmium oxide initial mixture is between 2.0-4.0 parts of said copper oxide to 1.0 part of said cadmium oxide.
Claim 7
Dependent Claim 29 words
The metallizing composition as recited in claim 4 wherein said weight percentage of said palladium powder is within the approximate range between 2.0%-6.0% by weight of said intimate mixture.
Claim 8
Dependent Claim 16 words
The metallizing composition as recited in claim 1 wherein said copper oxide powder is cupric oxide.
Claim 9
Dependent Claim 28 words
The metallizing composition as recited in claim 7 wherein said weight percentage of said rhuthemium oxide is within the approximate range between 1.08-3.0 percent of said intimate mixtures.
Claim 10
Dependent Claim 30 words
The metallizing composition as recited in claim 8 wherein said weight percentage of said palladium powder is within the approximate range between 2.0-6.0 percent by weight of said intimate mixture.
Claim 11
Dependent Claim 36 words
The metallizing composition as recited in claim 9 wherein said weight percentage of said initial mixture of said cadmium oxide and said copper oxide is within the approximate range between 2.0-4.0 percent of said intimate mixture.
Claim 12
Dependent Claim 37 words
The metallizing composition as recited in claim 10 wherein said weight ratio of said copper oxide and said cadmium oxide initial mixture is between 2.0-4.0 parts of said copper oxide to 1.0 part of said cadmium oxide.
Claim 13
Dependent Claim 27 words
The metallizing composition as recited in claim 11 including about 10.0-60.0 percent by weight percentage of said intimate mixture of an organic binder devoid of glass frits.

References Cited (Backward Citations)

US3450545A Cited
US3497384A Cited
US3830651A Cited
US3799891A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-11-10 1979-05-12 1979-11-11 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-11-10 1983-05-12 1983-11-11 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-11-10 1987-05-12 1987-11-11 $7700.00 Window Closed / Lapsed

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