GB521827A - Improvements relating to electrical rectifiers - Google Patents
Improvements relating to electrical rectifiersInfo
- Publication number
- GB521827A GB521827A GB34788/38A GB3478838A GB521827A GB 521827 A GB521827 A GB 521827A GB 34788/38 A GB34788/38 A GB 34788/38A GB 3478838 A GB3478838 A GB 3478838A GB 521827 A GB521827 A GB 521827A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oxide
- volume
- per cent
- copper
- blanks
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 abstract 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 3
- 229910052802 copper Inorganic materials 0.000 abstract 3
- 239000010949 copper Substances 0.000 abstract 3
- 229960004643 cupric oxide Drugs 0.000 abstract 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 abstract 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 abstract 2
- 235000011114 ammonium hydroxide Nutrition 0.000 abstract 2
- 239000007864 aqueous solution Substances 0.000 abstract 2
- 238000000576 coating method Methods 0.000 abstract 2
- 229920001971 elastomer Polymers 0.000 abstract 2
- 239000002184 metal Substances 0.000 abstract 2
- 229910052751 metal Inorganic materials 0.000 abstract 2
- 229910052759 nickel Inorganic materials 0.000 abstract 2
- 239000005751 Copper oxide Substances 0.000 abstract 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract 1
- 239000000908 ammonium hydroxide Substances 0.000 abstract 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 abstract 1
- 239000004327 boric acid Substances 0.000 abstract 1
- 229910000431 copper oxide Inorganic materials 0.000 abstract 1
- BERDEBHAJNAUOM-UHFFFAOYSA-N copper(I) oxide Inorganic materials [Cu]O[Cu] BERDEBHAJNAUOM-UHFFFAOYSA-N 0.000 abstract 1
- KRFJLUBVMFXRPN-UHFFFAOYSA-N cuprous oxide Chemical compound [O-2].[Cu+].[Cu+] KRFJLUBVMFXRPN-UHFFFAOYSA-N 0.000 abstract 1
- 229940112669 cuprous oxide Drugs 0.000 abstract 1
- 230000000873 masking effect Effects 0.000 abstract 1
- 230000001590 oxidative effect Effects 0.000 abstract 1
- 239000012047 saturated solution Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 abstract 1
- 229910021653 sulphate ion Inorganic materials 0.000 abstract 1
- 239000001117 sulphuric acid Substances 0.000 abstract 1
- 235000011149 sulphuric acid Nutrition 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/16—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising cuprous oxide or cuprous iodide
- H01L21/161—Preparation of the foundation plate, preliminary treatment oxidation of the foundation plate, reduction treatment
- H01L21/165—Reduction of the copper oxide, treatment of the oxide layer
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
521,827. Asymmetrically-conducting resistances ; electrolytic reduction of copper oxide- WESTINGHOUSE BRAKE & SIGNAL CO., Ltd. Nov. 29, 1938, No. 34788. Convention date, Aug. 17. [Classes 37 and 41] The outer surface of the copper oxide layer of a rectifier is reduced electrolytically to form a copper contact surface in a bath comprising , ammonium hydroxide preferably in weak aqueous solution, e.g. 0.2 per cent. by volume of concentrated NH4OH (s.g. 0.880). Current of density of 12 amps. per sq. ft. is passed for 3-5 minutes, the bath being at room temperature and mechanically agitated. 0.05 per cent by volume of a saturated solution of ammoniun sulphate may be added tc the solution whereby the voltage required is reduced. In preparing the oxide surface annular, copper blanks are mounted in pairs on a support and heated in an oxidizing atmosphere, whereby they are coated with an inner layer of cuprous oxide and an outer layer of cupric oxide, the layers being thinner on the facing surfaces. They are then quenched and'treated with an aqueous solution of 2 per cent. by volume of sulphuric acid and 0.1 per cent. by volume of hydrochloric acid whereby both layers are removed on the thinly coated side and the cupric oxide layer only on the other side. In the electrolytic treatment two blanks A are mounted with their oxide coatings outwards on either side of a metal washer 3 to which are cemented rubber washers 4 extending beyond the periphery of the blanks A. Rubber washers 6 masking the outer edge of the oxide coatings are then applied and the assembly clamped between washers 7. Nickel or other metal may be plated on to the reduced surface. A suitable nickel bath contains NiSO4.7H2O 27 oz., NiCl2.6H2O 4 oz., boric acid 6 oz. per U.S.A. gallon.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US213876A US2197632A (en) | 1938-06-15 | 1938-06-15 | Electrical rectifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB521827A true GB521827A (en) | 1940-05-31 |
Family
ID=22796848
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34788/38A Expired GB521827A (en) | 1938-06-15 | 1938-11-29 | Improvements relating to electrical rectifiers |
| GB1519/39A Expired GB523858A (en) | 1938-06-15 | 1939-01-16 | Improvements relating to electric dry-contact rectifiers |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1519/39A Expired GB523858A (en) | 1938-06-15 | 1939-01-16 | Improvements relating to electric dry-contact rectifiers |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2197632A (en) |
| FR (3) | FR848927A (en) |
| GB (2) | GB521827A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3432423A (en) * | 1966-10-07 | 1969-03-11 | Gen Dynamics Corp | Electroplating apparatus |
| US4445942A (en) * | 1979-11-26 | 1984-05-01 | General Electric Company | Method for forming nuclear fuel containers of a composite construction and the product thereof |
-
1938
- 1938-06-15 US US213876A patent/US2197632A/en not_active Expired - Lifetime
- 1938-11-29 GB GB34788/38A patent/GB521827A/en not_active Expired
-
1939
- 1939-01-16 GB GB1519/39A patent/GB523858A/en not_active Expired
- 1939-01-16 FR FR848927D patent/FR848927A/en not_active Expired
- 1939-05-13 FR FR51009D patent/FR51009E/en not_active Expired
- 1939-12-05 FR FR51016D patent/FR51016E/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR51009E (en) | 1941-05-28 |
| FR848927A (en) | 1939-11-09 |
| GB523858A (en) | 1940-07-24 |
| US2197632A (en) | 1940-04-16 |
| FR51016E (en) | 1941-05-28 |
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