GB804688A - Improvements in or relating to dynamo electric machines - Google Patents
Improvements in or relating to dynamo electric machinesInfo
- Publication number
- GB804688A GB804688A GB1476657A GB1476657A GB804688A GB 804688 A GB804688 A GB 804688A GB 1476657 A GB1476657 A GB 1476657A GB 1476657 A GB1476657 A GB 1476657A GB 804688 A GB804688 A GB 804688A
- Authority
- GB
- United Kingdom
- Prior art keywords
- temperature
- silver nitrate
- impregnation
- silver
- molten
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/51—Metallising, e.g. infiltration of sintered ceramic preforms with molten metal
- C04B41/5116—Ag or Au
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/85—Coating or impregnation with inorganic materials
- C04B41/88—Metals
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
Silver is deposited within the pores of a porous carbon or graphite body for use as an electrical contact element by impregnating the body with molten silver nitrate, e.g. at a temperature of 212-220 DEG C., and decomposing the silver nitrate by heating the impregnated body in the presence of a gaseous reducing agent, e.g. hydrogen or gaseous formaldehyde, at a temperature below the melting-point of silver nitrate. Impregnation may be effected by floating the body in a bath of molten silver nitrate. Impregnation is preferably continued until the body is substantially completely saturated. The porous carbon or graphite body treated may have been incompletely impregnated with polytetrafluorethylene or the mono-, chloro-, bromo-, or iodo-derivative thereof. In the example, a block of carbon was floated on molten silver nitrate at a temperature of 220 DEG C. for a period of 90 mins., and then heated in a sealed container in an atmosphere of hydrogen, at a temperature of 190-210 DEG C. for a period of 1 hour, whereafter the temperature was slowly raised to 300 DEG C. to produce a product containing 15 per cent of silver.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1476657A GB804688A (en) | 1957-05-09 | 1957-05-09 | Improvements in or relating to dynamo electric machines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1476657A GB804688A (en) | 1957-05-09 | 1957-05-09 | Improvements in or relating to dynamo electric machines |
Publications (1)
Publication Number | Publication Date |
---|---|
GB804688A true GB804688A (en) | 1958-11-19 |
Family
ID=10047116
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1476657A Expired GB804688A (en) | 1957-05-09 | 1957-05-09 | Improvements in or relating to dynamo electric machines |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB804688A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013212062A1 (en) * | 2013-06-25 | 2015-01-08 | Pantrac Gmbh | Device for discharging grounding currents, in particular in wind power plants |
-
1957
- 1957-05-09 GB GB1476657A patent/GB804688A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013212062A1 (en) * | 2013-06-25 | 2015-01-08 | Pantrac Gmbh | Device for discharging grounding currents, in particular in wind power plants |
DE102013212062B4 (en) * | 2013-06-25 | 2017-05-11 | Pantrac Gmbh | Device for discharging grounding currents, in particular in wind power plants |
US10109969B2 (en) | 2013-06-25 | 2018-10-23 | Pantrac Gmbh | Device discharging ground currents, particularly in wind turbines |
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