US5081070A
Expired / Lapsed
US
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Superconducting circuit board and paste adopted therefor
Assignee: Fujitsu Ltd
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Filing: 1989-01-30
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Granted: 1992-01-14
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Expires: 2009-01-30
Abstract
Abstract A superconducting circuit board is provided comprising a sintered alumina board containing more than 99% by weight of alumina and an interconnection pattern of an superconducting ceramics formed on the alumina board. Adhesion of the interconnection pattern to the alumina board is improved by an addition of Ti or Si coupling agent to a paste for forming the interconnection pattern. The use of copper powder in place of copper oxide powder as an ingredient forming a superconducting ceramics in the paste is advantageous for printing and obtaining a uniform superconducting ceramic pattern.
Inventors
- 👤 Hiromitsu Yokoyama
- 👤 Yoshihiko Imanaka
- 👤 Kazunori Yamanaka
- 👤 Nobuo Kamehara
- 👤 Koichi Niwa
- 👤 Takuya Uzumaki
- 👤 Hitoshi Suzuki
- 👤 Takato Machi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:11
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/01; H10W70/05; B; B32; B32B; B32B18/00; C; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/4504; C04B35/4512; C04B35/4521; C04B37/00; C04B37/003; C04B37/005; C04B37/006; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0296; H10N60/0352; H10W20/00; H10W20/01; H10W20/031; H10W20/064; H10W70/60; H10W70/62; H10W70/66; H10W70/668; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/48; C04B2235/483; C04B2235/65; C04B2235/656; C04B2235/6567; C04B2237/00; C04B2237/02; C04B2237/04; C04B2237/06; C04B2237/066; C04B2237/09; C04B2237/12; C04B2237/125; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/50; C04B2237/59; C04B2237/68; C04B2237/70; C04B2237/704; C04B2237/708; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10S428/922; Y10S428/9265; Y10S428/93; Y10S505/00; Y10S505/70; Y10S505/701; Y10S505/702; Y10S505/703; Y10S505/704; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/24926
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
115 words
A superconducting circuit board, comprising: a sintered alumina board containing more than 99% by weight of alumina; and a superconducting ceramic pattern formed on the alumina board, the superconducting ceramic pattern is made of a superconducting oxide represented by the general formula: A.sub.0.5-1.8 R.sub.0.2-2 MO.sub.2-5 where A stands for at least one element selected from the group consisting of Ba, Sr, Ca and Mg; R stands for at least one element selected from the group consisting of Sc Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; M stands for at least one metal selected from the group of copper, silver and gold, and O stands for oxygen.
Claim 2
Dependent Claim
115 words
A superconducting circuit board, comprising: a sintered alumina board containing more than 99% by weight of alumina; and a superconducting ceramic pattern formed on the alumina board, the superconducting ceramic pattern is made of a superconducting oxide represented by the general formula: A.sub.0.5-1.8 R.sub.0.2-2 MO.sub.2-5 where A stands for at least one element selected from the group consisting of Ba, Sr, Ca and Mg; R stands for at least one element selected from the group consisting of Sc Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; M stands for at least one metal selected from the group of copper, silver and gold, and O stands for oxygen.
Claim 3
Dependent Claim
34 words
A substrate according to claim 1, wherein the sintered alumina board does not contain more than 0.5% by weight of a composition including at least one of a vitreous component and an amorphous component.
Claim 4
Dependent Claim
36 words
A circuit board according to claim 1, wherein the sintered alumina board contains more than 99.7% by weight of alumina and less than 0.3% of at least one of MgO and Cr 2=l O 3 .
Claim 5
Dependent Claim
23 words
A circuit board according to claim 1, wherein the superconducting ceramic pattern is made of a superconducting ceramics of Bi-Sr-Ca-Cu-O or Tl-Bi-Sr-Ca-Cu-O system.
Claim 6
Dependent Claim
144 words
A superconducting circuit board comprising: a sintered alumina board containing more than 99% by weight of alumina; a superconducting ceramic pattern formed on the alumina board, the superconducting ceramic pattern containing 100 parts by weight of a superconducting ceramics and 0.01 to 10 parts by weight of at least one of titanium and silicon oxide compounds, the superconducting ceramic pattern is made of a superconducting oxide represented by the general formula: A.sub.0.5-1.8 R.sub.0.2-2 MO.sub.2-5 where A stands for at least one element selected from the group consisting of Ba, Sr, Ca and Mg; R stands for at least one element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Go, Er, Tm, Yb and Lu; M stands for at least one metal selected from the group of copper, silver and gold, and O stands for oxygen.
Claim 7
Dependent Claim
144 words
A superconducting circuit board comprising: a sintered alumina board containing more than 99% by weight of alumina; a superconducting ceramic pattern formed on the alumina board, the superconducting ceramic pattern containing 100 parts by weight of a superconducting ceramics and 0.01 to 10 parts by weight of at least one of titanium and silicon oxide compounds, the superconducting ceramic pattern is made of a superconducting oxide represented by the general formula: A.sub.0.5-1.8 R.sub.0.2-2 MO.sub.2-5 where A stands for at least one element selected from the group consisting of Ba, Sr, Ca and Mg; R stands for at least one element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Go, Er, Tm, Yb and Lu; M stands for at least one metal selected from the group of copper, silver and gold, and O stands for oxygen.
Claim 8
Dependent Claim
30 words
A circuit board according to claim 5, wherein the superconducting ceramic pattern contains 0.4 to 1.0 parts by weight of at least one of the titanium and silicon coupling agents.
Claim 9
Dependent Claim
22 words
A circuit board according to claim 1, wherein the superconducting ceramic pattern is a multilayer structure carrying a plurality of interconnection films.
Claim 10
Dependent Claim
119 words
A superconducting circuit board, comprising: a sintered alumina board containing more than 99% by weight of alumina; and a superconducting ceramic pattern formed on the alumina board the superconducting ceramic pattern is made of a superconducting oxide represented by the general formula: {(M.sup.II O).sub.x (M.sub.2.sup.III O.sub.3).sub.1-x }.sub.y.(CuO).sub.2.O.sub.δ where M II is at least one element selected from the group of Ba, Sr, Ca and Mg; M III is at least one element selected from the group of Y, Sc, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; 0.5≦x≦0.9; 1≦y≦2; 1≦z≦2; and δ is a deviation from the stoichiometric amount of oxygen; the superconducting oxide exhibiting superconductivity at the temperature of liquid nitrogen.
Claim 11
Dependent Claim
119 words
A superconducting circuit board, comprising: a sintered alumina board containing more than 99% by weight of alumina; and a superconducting ceramic pattern formed on the alumina board the superconducting ceramic pattern is made of a superconducting oxide represented by the general formula: {(M.sup.II O).sub.x (M.sub.2.sup.III O.sub.3).sub.1-x }.sub.y.(CuO).sub.2.O.sub.δ where M II is at least one element selected from the group of Ba, Sr, Ca and Mg; M III is at least one element selected from the group of Y, Sc, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; 0.5≦x≦0.9; 1≦y≦2; 1≦z≦2; and δ is a deviation from the stoichiometric amount of oxygen; the superconducting oxide exhibiting superconductivity at the temperature of liquid nitrogen.
Claim 12
Dependent Claim
34 words
A substrate according to claim 8, wherein the sintered alumina board does not contain more than 0.5% by weight of a composition including at least one of a vitreous component and an amorphous component.
Claim 13
Dependent Claim
36 words
A circuit board according to claim 8, wherein the sintered alumina board contains more than 99.7% by weight of alumina and less than 0.3% of at least one of MgO and Cr 2 O 3 .
Claim 14
Dependent Claim
23 words
A circuit board according to claim 8, wherein the superconducting ceramic pattern is made of a superconducting ceramics of Bi-Sr-Ca-Cu-O or Tl-Bi-Sr-Ca-Cu-O system.
Claim 15
Dependent Claim
148 words
A superconducting circuit board comprising: a sintered alumina board contains more than 99% by weight of alumina; a superconducting ceramic pattern formed on the alumina board, the superconducting ceramic pattern containing 100 parts by weight of a superconducting ceramics and 0.1 to 10 parts by weight of at least one of titanium and silicon oxide compounds the superconducting ceramic pattern is made of a superconducting oxide represented by the general formula: {(M.sup.II O).sub.x (M.sub.2.sup.III O.sub.3).sub.1-x }.sub.y.(CuO).sub.2.O.sub.δ where M II is at least one element selected from the group of Ba, Sr, Ca and Mg; M III is at least one element selected from the group of Y, Sc La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; 0.5≦x≦0.9; 1≦y≦2; 1≦z≦2; and δ is a deviation from the stoichiometric amount of oxygen; the superconducting oxide exhibiting superconductivity at the temperature of liquid nitrogen.
Claim 16
Dependent Claim
148 words
A superconducting circuit board comprising: a sintered alumina board contains more than 99% by weight of alumina; a superconducting ceramic pattern formed on the alumina board, the superconducting ceramic pattern containing 100 parts by weight of a superconducting ceramics and 0.1 to 10 parts by weight of at least one of titanium and silicon oxide compounds the superconducting ceramic pattern is made of a superconducting oxide represented by the general formula: {(M.sup.II O).sub.x (M.sub.2.sup.III O.sub.3).sub.1-x }.sub.y.(CuO).sub.2.O.sub.δ where M II is at least one element selected from the group of Ba, Sr, Ca and Mg; M III is at least one element selected from the group of Y, Sc La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; 0.5≦x≦0.9; 1≦y≦2; 1≦z≦2; and δ is a deviation from the stoichiometric amount of oxygen; the superconducting oxide exhibiting superconductivity at the temperature of liquid nitrogen.
Claim 17
Dependent Claim
30 words
A circuit board according to claim 11, wherein the superconducting ceramic pattern contains 0.4 to 1.0 parts by weight of at least one of the titanium and silicon coupling agents.
Claim 18
Dependent Claim
22 words
A circuit board according to claim 8, wherein the superconducting ceramic pattern is a multilayer structure carrying a plurality of interconnection films.
References Cited (Backward Citations)
US4835039A
Cited
EP0292125A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-13 | 1995-07-15 | 1996-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-13 | 1999-07-15 | 2000-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-13 | 2003-07-15 | 2004-01-14 | $7700.00 | Window Closed / Lapsed |