GB1369458A - Formation of vitreous layers and bodies having vitreous layers and bodies having vitreous layers formed thereon - Google Patents

Formation of vitreous layers and bodies having vitreous layers and bodies having vitreous layers formed thereon

Info

Publication number
GB1369458A
GB1369458A GB5815871A GB5815871A GB1369458A GB 1369458 A GB1369458 A GB 1369458A GB 5815871 A GB5815871 A GB 5815871A GB 5815871 A GB5815871 A GB 5815871A GB 1369458 A GB1369458 A GB 1369458A
Authority
GB
United Kingdom
Prior art keywords
vitreous material
vitreous
bodies
vitreous layers
ferrite
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
GB5815871A
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.)
Fujitsu Services Ltd
Original Assignee
Fujitsu Services 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 Fujitsu Services Ltd filed Critical Fujitsu Services Ltd
Priority to GB5815871A priority Critical patent/GB1369458A/en
Priority to AU49679/72A priority patent/AU467851B2/en
Priority to FR7244830A priority patent/FR2163706A1/fr
Publication of GB1369458A publication Critical patent/GB1369458A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
    • H01F1/0311—Compounds
    • H01F1/0313—Oxidic compounds
    • H01F1/0315—Ferrites
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
    • G11B5/23—Gap features
    • G11B5/235—Selection of material for gap filler

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Ceramic Products (AREA)
  • Magnetic Heads (AREA)

Abstract

1369458 Ceramic seals INTERNATIONAL COMPUTERS Ltd 12 Dec 1972 [15 Dec 1971] 58158/71 Heading B3V [Also in Division C1] In joining ferrite polepieces 1, 2 (e.g. in forming a magnetic transducing head), vitreous material 3 is placed in the gap between the pieces and heated to allow the vitreous material to assume a fluid state and fill the gap, the pressure of the inert surrounding atmosphere then being cyclically varied between upper and lower limits to cause migration of occluded gas through the still-fluid vitreous material away from the ferrite. The glass may be a lead borate or lead borosilicate glass, examples of which are given. The pressure may be varied between 0À1 torr and 1 atmosphere, each cycle taking, e.g. 12 sees. The glass-bonded ferrite assembly may subsequently be encapsulated with a second vitreous material of lower softening temperature, so that the second material may be subjected to a similar cyclic pressure variation without softening the first vitreous material.
GB5815871A 1971-12-15 1971-12-15 Formation of vitreous layers and bodies having vitreous layers and bodies having vitreous layers formed thereon Expired GB1369458A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB5815871A GB1369458A (en) 1971-12-15 1971-12-15 Formation of vitreous layers and bodies having vitreous layers and bodies having vitreous layers formed thereon
AU49679/72A AU467851B2 (en) 1971-12-15 1972-12-06 Improvements in or relating tothe formation of vitreous layers and bodies having vitreous layers formed thereon
FR7244830A FR2163706A1 (en) 1971-12-15 1972-12-15

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5815871A GB1369458A (en) 1971-12-15 1971-12-15 Formation of vitreous layers and bodies having vitreous layers and bodies having vitreous layers formed thereon

Publications (1)

Publication Number Publication Date
GB1369458A true GB1369458A (en) 1974-10-09

Family

ID=10480905

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5815871A Expired GB1369458A (en) 1971-12-15 1971-12-15 Formation of vitreous layers and bodies having vitreous layers and bodies having vitreous layers formed thereon

Country Status (2)

Country Link
FR (1) FR2163706A1 (en)
GB (1) GB1369458A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0077881A2 (en) * 1981-10-26 1983-05-04 International Business Machines Corporation Bonding ceramic components and removing bubbles from bonding material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0077881A2 (en) * 1981-10-26 1983-05-04 International Business Machines Corporation Bonding ceramic components and removing bubbles from bonding material
EP0077881A3 (en) * 1981-10-26 1985-05-22 International Business Machines Corporation Bonding ceramic components and removing bubbles from bonding material

Also Published As

Publication number Publication date
FR2163706A1 (en) 1973-07-27
AU4967972A (en) 1974-06-06

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee