GB702877A - Method of electrolytically etching tantalum - Google Patents
Method of electrolytically etching tantalumInfo
- Publication number
- GB702877A GB702877A GB13966/52A GB1396652A GB702877A GB 702877 A GB702877 A GB 702877A GB 13966/52 A GB13966/52 A GB 13966/52A GB 1396652 A GB1396652 A GB 1396652A GB 702877 A GB702877 A GB 702877A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ammonium bromide
- per cent
- water
- calcium chloride
- methanol
- 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
- 229910052715 tantalum Inorganic materials 0.000 title abstract 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 title abstract 2
- 238000005530 etching Methods 0.000 title 1
- 238000000034 method Methods 0.000 title 1
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 abstract 6
- SWLVFNYSXGMGBS-UHFFFAOYSA-N ammonium bromide Chemical compound [NH4+].[Br-] SWLVFNYSXGMGBS-UHFFFAOYSA-N 0.000 abstract 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 abstract 2
- 229910001628 calcium chloride Inorganic materials 0.000 abstract 2
- 239000001110 calcium chloride Substances 0.000 abstract 2
- 239000003990 capacitor Substances 0.000 abstract 1
- 239000003792 electrolyte Substances 0.000 abstract 1
- 238000000866 electrolytic etching Methods 0.000 abstract 1
- 150000004820 halides Chemical class 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
- H01G9/055—Etched foil electrodes
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/02—Etching
- C25F3/08—Etching of refractory metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Weting (AREA)
- ing And Chemical Polishing (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
702,877. Electrolytic etching ; electric condensers. BRITISH THOMSON-HOUSTON CO., Ltd. June 3, 1952 [July 11, 1951], No. 13966/52. Addition to 691,509. Classes 37 and 41 A tantalum surface is etched to provide a higher effective surface area when employed as a capacitor electrode by' treatment as anode in an electrolyte comprising methanol, a trace of water and sufficient ammonium bromide dissolved therein to permit passage of a current. By the selection of ammonium bromide as the halide component the permissible water content is less critical and may be in the range of 6,000-135,000 parts per million. Ammonium bromide may be used together with calcium chloride; a suitable bath contains by weight 3.5 per cent. calcium chloride, 3.5 per cent. ammonium bromide and 93 per cent. methanol together with 5.9-135 millilitres of water per litre of solution. Etch ratios as high as 6.5 may be obtained.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US307013XA | 1950-08-29 | 1950-08-29 | |
| US772290XA | 1952-12-17 | 1952-12-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB702877A true GB702877A (en) | 1954-01-27 |
Family
ID=26706363
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB19697/51A Expired GB691509A (en) | 1950-08-29 | 1951-08-21 | Improvements in and relating to capacitor electrodes |
| GB13966/52A Expired GB702877A (en) | 1950-08-29 | 1952-06-03 | Method of electrolytically etching tantalum |
| GB34927/53A Expired GB772290A (en) | 1950-08-29 | 1953-12-15 | Improvements relating to etching tantalum |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB19697/51A Expired GB691509A (en) | 1950-08-29 | 1951-08-21 | Improvements in and relating to capacitor electrodes |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34927/53A Expired GB772290A (en) | 1950-08-29 | 1953-12-15 | Improvements relating to etching tantalum |
Country Status (6)
| Country | Link |
|---|---|
| BE (3) | BE512764A (en) |
| CH (2) | CH307013A (en) |
| DE (2) | DE925330C (en) |
| FR (4) | FR1078317A (en) |
| GB (3) | GB691509A (en) |
| NL (4) | NL170580B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2775553A (en) * | 1952-12-31 | 1956-12-25 | Sprague Electric Co | Electrolytic etching process for electrolytic capacitors |
| US2834926A (en) * | 1954-11-16 | 1958-05-13 | Mallory & Co Inc P R | Tantalum electrolytic capacitor with iron chloride depolarizer |
| DE1191912B (en) * | 1954-11-25 | 1965-04-29 | Siemens Ag | Process for the production of low-temperature electrolytic capacitors using paper as a spacer |
| NL93969C (en) * | 1955-05-09 | |||
| US3070522A (en) * | 1957-11-08 | 1962-12-25 | Sprague Electric Co | Process for electrochemically etching tantalum foil |
| NL291334A (en) * | 1962-04-27 | |||
| CN108441936A (en) * | 2018-04-19 | 2018-08-24 | 湖南工业大学 | A kind of preparation method of spongy tantalum piece |
| CN108456917A (en) * | 2018-04-19 | 2018-08-28 | 湖南工业大学 | A kind of preparation method of porous tantalum piece |
| CN113745007B (en) * | 2021-08-24 | 2023-03-28 | 西安交通大学 | Electrochemical corrosion dilatation process of anode foil of tantalum electrolytic capacitor |
| CN116288636B (en) * | 2023-02-06 | 2024-05-03 | 安徽格兰科新材料技术有限公司 | High-pressure-resistant ordered porous tantalum foil and preparation method and application thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2035022A (en) * | 1931-03-28 | 1936-03-24 | Sprague Specialties Co | Electrolytic device |
| US2183091A (en) * | 1936-07-20 | 1939-12-12 | Philips Nv | Electrolytic cell |
-
0
- NL NL7017503.A patent/NL163609B/en unknown
- NL NL77804D patent/NL77804C/xx active
- BE BE525144D patent/BE525144A/xx unknown
- NL NL80311D patent/NL80311C/xx active
- BE BE505482D patent/BE505482A/xx unknown
- NL NLAANVRAGE7613247,A patent/NL170580B/en unknown
- BE BE512764D patent/BE512764A/xx unknown
-
1951
- 1951-08-21 GB GB19697/51A patent/GB691509A/en not_active Expired
- 1951-08-27 CH CH307013D patent/CH307013A/en unknown
- 1951-08-28 DE DEI4557A patent/DE925330C/en not_active Expired
- 1951-08-28 FR FR1078317D patent/FR1078317A/en not_active Expired
-
1952
- 1952-06-03 GB GB13966/52A patent/GB702877A/en not_active Expired
- 1952-06-24 CH CH311511D patent/CH311511A/en unknown
- 1952-07-04 FR FR63070D patent/FR63070E/en not_active Expired
-
1953
- 1953-12-09 DE DEG13258A patent/DE942004C/en not_active Expired
- 1953-12-15 GB GB34927/53A patent/GB772290A/en not_active Expired
- 1953-12-15 FR FR1095024D patent/FR1095024A/en not_active Expired
-
1956
- 1956-05-09 FR FR69991D patent/FR69991E/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE525144A (en) | |
| NL170580B (en) | |
| BE512764A (en) | |
| CH311511A (en) | 1955-11-30 |
| DE925330C (en) | 1955-03-17 |
| FR1078317A (en) | 1954-11-17 |
| GB772290A (en) | 1957-04-10 |
| FR63070E (en) | 1955-07-15 |
| FR69991E (en) | 1959-01-30 |
| CH307013A (en) | 1955-05-15 |
| DE942004C (en) | 1956-04-26 |
| BE505482A (en) | |
| NL80311C (en) | |
| FR1095024A (en) | 1955-05-26 |
| NL77804C (en) | |
| NL163609B (en) | |
| GB691509A (en) | 1953-05-13 |
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