GB804688A - Improvements in or relating to dynamo electric machines - Google Patents

Improvements in or relating to dynamo electric machines

Info

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
Application number
GB1476657A
Inventor
Bernard Roy Atkins
David Peter Griffiths
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NOBRAC CARBON Ltd
Original Assignee
NOBRAC CARBON Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NOBRAC CARBON Ltd filed Critical NOBRAC CARBON Ltd
Priority to GB1476657A priority Critical patent/GB804688A/en
Publication of GB804688A publication Critical patent/GB804688A/en
Expired legal-status Critical Current

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.
GB1476657A 1957-05-09 1957-05-09 Improvements in or relating to dynamo electric machines Expired GB804688A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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