US4822645A
Expired / Lapsed
US
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Metallizing paste and a process for metallizing ceramic articles by using such a metallizing paste
Assignee: NGK Insulators Ltd
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Filing: 1987-10-07
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Granted: 1989-04-18
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Expires: 2007-10-07
Abstract
Abstract Metallizing pastes are disclosed, which contain, as inorganic materials, 15 to 50% by weight of a component to form a glass phase and 50 to 85% by weight of a metallic molybdenum powder. The glass phase essentially consists of 5 to 25% by weight of Al 2 O 3 , 35 to 55% by weight of SiO 2 and 30 to 55% by weight of MnO. A process for metallizing ceramic members is also disclosed. The metallizing paste is applied to surfaces of the ceramic member and the dried. The ceramic member with the dried metallizing paste is then fired in a temperature range from 1,200° to 1,400° C. for 0.5 to 10 hours in a mixed gas of hydrogen gas and nitrogen gas in which a ratio in partial pressure between steam and hydrogen, (P H .sbsb.2 O /P H .sbsb.2), is adjusted in a range from 10 -6 to 10 0 .
Inventors
- 👤 Isao Oda
- 👤 Minoru Matsui
- 👤 Nobuo Tsuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:36
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/076; C03C3/083; C03C3/085; C03C8/00; C03C8/14; C03C8/18; C04B41/45; C04B41/50; C04B41/51; C04B41/5138; C04B41/80; C04B41/81; C04B41/85; C04B41/88; H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
78 words
A metallizing paste containing, as inorganic materials, 15 to 50% by weight of a component to form a glass phase consisting essentially of 5 to 25% by weight of Al 2 O 3 , 35 to 55% by weight of SiO 2 , and 30 to 55% by weight of MnO, and 50 to 85% by weight of metallic molybdenum having a purity of not less than 99.5% by weight and an average particle size of 0.65±0.1 μm.
Claim 2
Dependent Claim
78 words
A metallizing paste containing, as inorganic materials, 15 to 50% by weight of a component to form a glass phase consisting essentially of 5 to 25% by weight of Al 2 O 3 , 35 to 55% by weight of SiO 2 , and 30 to 55% by weight of MnO, and 50 to 85% by weight of metallic molybdenum having a purity of not less than 99.5% by weight and an average particle size of 0.65±0.1 μm.
Claim 3
Dependent Claim
25 words
A metallizing paste according to claim 1, wherein a melting point of a glass phase formed by said component is from 1,140° to 1,300° C.
Claim 4
Dependent Claim
43 words
A metallizing paste according to claim 1, wherein said component to form the glass phase consisting essentially of Al 2 O 3 , SiO 2 and MnO is substantially composed of powders of Al 2 O 3 , SiO 2 and metallic manganese.
Claim 5
Dependent Claim
188 words
A process for metallizing ceramic articles, which comprises the steps of: (1) applying, to a surface of a ceramic member, a metallizing paste containing, as inorganic materials, 15 to 50% by weight of a component to form a glass phase consisting essentially of 5 to 25% by weight of Al 2 O 3 , 35 to 55% by weight of SiO 2 and 30 to 55% by weight of MnO, and 50 to 85% by weight of metallic molybdenum powder having a purity of not less than 99.5% by weight and an average particle size of 0.65±0.1 μm; (2) drying the metallizing paste applied onto the surface of the ceramic member; (3) heating the ceramic member having the dried metallized paste on the surface thereof at a temperature range from 1,200° to 1,400° C. for 0.5 to 10 hours in a mixed gas of hydrogen gas and nitrogen gas in which a ratio in partial pressure between steam and hydrogen, (PH 2 O/PH 2 ), is adjusted to be in a range of 10 -6 to 10 0 ; and (4) cooling the ceramic member to room temperature.
Claim 6
Dependent Claim
188 words
A process for metallizing ceramic articles, which comprises the steps of: (1) applying, to a surface of a ceramic member, a metallizing paste containing, as inorganic materials, 15 to 50% by weight of a component to form a glass phase consisting essentially of 5 to 25% by weight of Al 2 O 3 , 35 to 55% by weight of SiO 2 and 30 to 55% by weight of MnO, and 50 to 85% by weight of metallic molybdenum powder having a purity of not less than 99.5% by weight and an average particle size of 0.65±0.1 μm; (2) drying the metallizing paste applied onto the surface of the ceramic member; (3) heating the ceramic member having the dried metallized paste on the surface thereof at a temperature range from 1,200° to 1,400° C. for 0.5 to 10 hours in a mixed gas of hydrogen gas and nitrogen gas in which a ratio in partial pressure between steam and hydrogen, (PH 2 O/PH 2 ), is adjusted to be in a range of 10 -6 to 10 0 ; and (4) cooling the ceramic member to room temperature.
Claim 7
Dependent Claim
26 words
A process according to claim 4, wherein the molar ratio of the hydrogen gas to the nitrogen gas is in a range from 3:1 to 1:1.
Claim 8
Dependent Claim
42 words
A process according to claim 4, wherein said component to form the glass phase consisting essentially of Al 2 O 3 , SiO 2 and MnO is substantially composed of powders of Al 2 O 3 , SiO 2 and metallic manganese.
Claim 9
Dependent Claim
38 words
A metallizing paste according to claim 1, wherein said component to form a glass phase is present in an amount between 20-40% by weight and said metallic molybdenum powder is present in an amount between 60-80% by weight.
Claim 10
Dependent Claim
38 words
A metallizing paste according to claim 1, wherein said component to form a glass phase is present in an amount between 20-30% by weight and said metallic molybdenum powder is present in an amount between 70-80% by weight.
Claim 11
Dependent Claim
39 words
A metallizing paste according to claim 1, wherein said component to form a glass phase consists essentially of 8-20% by weight of Al 2 O 3 , 40-50% by weight of SiO 2 and 35-50% by weight of MnO.
Claim 12
Dependent Claim
39 words
A metallizing paste according to claim 1, wherein said component to form a glass phase consists essentially of 9-18% by weight of Al 2 O 3 , 40-46% by weight of SiO 2 and 38-50% by weight of MnO.
Claim 13
Dependent Claim
20 words
A metallizing paste according to claim 1, wherein said metallic molybdenum powder has an average particle size of 0.65±0.05 μm.
References Cited (Backward Citations)
US3023492A
Cited
US3347704A
Cited
US3403043A
Cited
US3620799A
Cited
US3590468A
Cited
US4485150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-17 | 1992-10-17 | 1993-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-17 | 1996-10-17 | 1997-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-17 | 2000-10-17 | 2001-04-18 | $7700.00 | Window Closed / Lapsed |