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 thereonInfo
- 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
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.
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)
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 |
-
1971
- 1971-12-15 GB GB5815871A patent/GB1369458A/en not_active Expired
-
1972
- 1972-12-15 FR FR7244830A patent/FR2163706A1/fr active Pending
Cited By (2)
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 |