US5019187A
Expired / Lapsed
US
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Brazing paste for bonding metal and ceramic
Assignee: Toshiba Corp
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Filing: 1990-03-07
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Granted: 1991-05-28
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Expires: 2010-03-07
Abstract
Abstract According to the present invention, there is provided an electronic component part comprising (i) a high thermal conductivity ceramic circuit board, (ii) terminal pins located over said circuit board, and (iii) a metal brazing material having metal brazing powder, at least one element selected from the Group IVa elements and a metal having a melting point higher than that of the metal brazing powder, the metal brazing material bonding said board and said pins. According to the present invention, metal, such as input/output terminal pins can very firmly be bonded to ceramic, such as a circuit board, within an atmosphere of, for example, N 2 gas without the scattering of any brazing material in which case, unlike the prior art method, any vacuum furnace is not employed.
Inventors
- 👤 Kiyoshi Iyogi
- 👤 Masako Nakahashi
- 👤 Hiromitsu Takeda
- 👤 Makoto Shirokane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:44
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3006; B23K35/02; B23K35/0222; B23K35/0244; B23K35/025; B23K35/302; C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/026; H; H10; H10W; H10W70/00; H10W70/099; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/123; C04B2237/124; C04B2237/125; C04B2237/126; C04B2237/127; C04B2237/30; C04B2237/32; C04B2237/36; C04B2237/366; C04B2237/40; C04B2237/50; C04B2237/56; C04B2237/568; C04B2237/62; C04B2237/72; C04B2237/76; C04B2237/80; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/49147; Y10T29/49149
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
64 words
A brazing paste for bonding metal and ceramic, consisting essentially of: (A) a brazing powder material containing: (i) a metallic brazing material as a principal component; (ii) at least Group IVa element selected from the group consisting of Ti, Zr and Hf, and (iii) a metal having a melting point higher than that of the metallic brazing material (i); and (B) an organic binder.
Claim 2
Dependent Claim
64 words
A brazing paste for bonding metal and ceramic, consisting essentially of: (A) a brazing powder material containing: (i) a metallic brazing material as a principal component; (ii) at least Group IVa element selected from the group consisting of Ti, Zr and Hf, and (iii) a metal having a melting point higher than that of the metallic brazing material (i); and (B) an organic binder.
Claim 3
Dependent Claim
42 words
The brazing paste according to claim 1, wherein said brazing powder material (A) contains said Group Iva element (ii) in an amount of 2 to 15% by weight, and said higher-melting metal (iii) in an amount of 2 to 50% by weight.
Claim 4
Dependent Claim
26 words
The brazing paste according to claim 1, wherein said Group Iva element (ii) is selected from the group consisting of Ti, Zr and a combination thereof.
Claim 5
Dependent Claim
26 words
The brazing paste according to claim 1, wherein said metallic brazing material (i) is a member selected from the group consisting of Ag, Cu and Ni.
Claim 6
Dependent Claim
27 words
The brazing paste according to claim 1, wherein said metallic brazing material (i) is at least one member selected from the group consisting of Ag and Cu.
Claim 7
Dependent Claim
16 words
The brazing paste according to claim 1, wherein said organic binder (B) is an acrylic polymer.
Claim 8
Dependent Claim
19 words
The brazing paste according to claim 6, wherein said acrylic polymer has a carboxylic group as a substituent group.
Claim 9
Dependent Claim
24 words
The brazing paste according to claim 7, wherein said acrylic polymer contains said carboxylic group in an amount of 1 to 5% by weight.
Claim 10
Dependent Claim
19 words
The brazing paste according to claim 6, wherein said acrylic polymer has a molecular weight of 5000 to 15000.
Claim 11
Dependent Claim
25 words
The brazing paste according to claim 6, wherein said acrylic polymer is selected from the group consisting of polyacrylic acid ester and polymethacrylic acid ester.
Claim 12
Dependent Claim
26 words
The brazing paste according to claim 1, wherein said higher-melting metal (iii) is a member selected from the group consisting of Mn, W, Mo and Ta.
Claim 13
Dependent Claim
33 words
The brazing paste according to claim 1, wherein said paste contains 3 to 15 parts by weight of said binder (B) based on 100 parts by weight of said brazing powder material (A).
Claim 14
Dependent Claim
92 words
A brazing paste for bonding metal and ceramic, consisting essentially of: (A) a brazing powder material containing: (i) a brazing metallic material, as a principal component, comprising at least one member selected from the group consisting of Cu, Ni and Ag, (ii) at least one Group IVa element selected from the group consisting of Ti, Zr and Hf, and (iii) a metal having a melting point higher than that of a metallic brazing material (i) and selected from the group consisting of Mn, W, Mo and Ta; and (B) an organic binder.
Claim 15
Dependent Claim
92 words
A brazing paste for bonding metal and ceramic, consisting essentially of: (A) a brazing powder material containing: (i) a brazing metallic material, as a principal component, comprising at least one member selected from the group consisting of Cu, Ni and Ag, (ii) at least one Group IVa element selected from the group consisting of Ti, Zr and Hf, and (iii) a metal having a melting point higher than that of a metallic brazing material (i) and selected from the group consisting of Mn, W, Mo and Ta; and (B) an organic binder.
Claim 16
Dependent Claim
67 words
A brazing paste for bonding metal and aluminum nitride ceramic, consisting essentially of: (A) a brazing powder material containing: (i) a metal brazing material as a principal component, (ii) at least one Group IVa element selected from the group consisting of Ti, Zr and Hf, and (iii) a metal having a melting point higher than that of the metallic brazing material (i); and (B) an organic binder.
Claim 17
Dependent Claim
67 words
A brazing paste for bonding metal and aluminum nitride ceramic, consisting essentially of: (A) a brazing powder material containing: (i) a metal brazing material as a principal component, (ii) at least one Group IVa element selected from the group consisting of Ti, Zr and Hf, and (iii) a metal having a melting point higher than that of the metallic brazing material (i); and (B) an organic binder.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |