US2303244A - Manufacture of insulating material - Google Patents
Manufacture of insulating material Download PDFInfo
- Publication number
- US2303244A US2303244A US351170A US35117040A US2303244A US 2303244 A US2303244 A US 2303244A US 351170 A US351170 A US 351170A US 35117040 A US35117040 A US 35117040A US 2303244 A US2303244 A US 2303244A
- Authority
- US
- United States
- Prior art keywords
- manufacture
- insulating material
- powder
- ground
- materials
- 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 - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title description 6
- 239000011810 insulating material Substances 0.000 title description 4
- 239000000463 material Substances 0.000 description 8
- 239000000843 powder Substances 0.000 description 6
- 239000010445 mica Substances 0.000 description 5
- 229910052618 mica group Inorganic materials 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 description 2
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 2
- 239000004327 boric acid Substances 0.000 description 2
- 229910001610 cryolite Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 235000017550 sodium carbonate Nutrition 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000008240 homogeneous mixture Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C03C14/00—Glass compositions containing a non-glass component, e.g. compositions containing fibres, filaments, whiskers, platelets, or the like, dispersed in a glass matrix
- C03C14/004—Glass compositions containing a non-glass component, e.g. compositions containing fibres, filaments, whiskers, platelets, or the like, dispersed in a glass matrix the non-glass component being in the form of particles or flakes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/04—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances mica
-
- 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
- C03C2214/00—Nature of the non-vitreous component
- C03C2214/04—Particles; Flakes
Definitions
- Thisinvention relates to the manufacture of micaceous insulating materials'ofthe kind which are formed by mixing low fusing point vitreous material with powdered mica and heating the mixture so that the mica is bonded to the vitreous material at a temperature below the point of total dehydration.
- Such materials and their manufacture are described, "for example; in U.;S. Patents Nos. 1,795,200, granted Mar. 3, 193 1, and 2,032,239, granted Feb, 25, 1936, and they are at present denoted bythe registered trade-mark Mycalex.- I
- the object of the present invention is to "provide improvements in the process of manufacturing insulating materials of the kind above referred to, such improvements being designed to ensure a product whereinthe structure and physical characteristics are uniform throughout each unit manufactured.
- a method of manufacturing a vitreous insulating material which consists in mixing ground mica with ground ceramic materials, in cold pressing the mixture, in drying the pressed sheets or blocks, in subjecting the dried sheets or blocks to a gradual rise in temperature in a furnace and. in cooling or moulding the heat treated material.
- the ceramic ingredients employed in the manufacture of the improved vitreous material consist of cryolite, barium carbonate, potassium carbonate, soda ash and boric acid, the preferred proportions being by weight as follows:
- These materials are first ground to a fine powder, and after grinding and thoroughly mixing, these materials are passed through a drying furce in which a temperature of 500 C. is mainined until a white glass frit is formed.
- the mica product is ground, care being taken grinding that the particle size is consistent and whilst the ground product should be capable of passing a mesh of 100 x 100 per square inch, the particles should not be smaller than this, as otherwise the finished product is apt to disintegrate under heat, with a corresponding loss. in di-electric properties.
- the frit is also ground tothe same .desreeasthe mics. and both are then mixed witha'quantity of heat treated Proportions of the'mix- Mycalex" the preferredture being as follows:
- mould cavity being filled with the desired amount of powder according to the size and thickness of the billet or other article to be pressed.
- the base of the mould cavity and the top of the charge of powder are preferably covered, before pressure is applied, with sheets of paper v in order to overcome the suction effect produced when the platens of the press are parted, thereby preventing the laminae of the completed billet being drawn apart.
- Pressure is applied to the powder at approximately 1 tons per square inch and produces solid billets which are placed in racks to dry over a period up to seven days,
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Dispersion Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Insulating Materials (AREA)
Description
Patented Nov. 24, 1942 mmacruaa F Albert William Henry wedlock, Brookway, i ChigwelLEnglnnd 1 No Drawing No.
Application August-9,1940, 351,170. ,In'Glelt Britain Allfllst 1939 11 Claim. (01. 255156) I Thisinvention relates to the manufacture of micaceous insulating materials'ofthe kind which are formed by mixing low fusing point vitreous material with powdered mica and heating the mixture so that the mica is bonded to the vitreous material at a temperature below the point of total dehydration. Such materials and their manufacture are described, "for example; in U.;S. Patents Nos. 1,795,200, granted Mar. 3, 193 1, and 2,032,239, granted Feb, 25, 1936, and they are at present denoted bythe registered trade-mark Mycalex.- I
The object of the present invention is to "provide improvements in the process of manufacturing insulating materials of the kind above referred to, such improvements being designed to ensure a product whereinthe structure and physical characteristics are uniform throughout each unit manufactured. I, g
According to theinvention a method of manufacturing a vitreous insulating material is provided which consists in mixing ground mica with ground ceramic materials, in cold pressing the mixture, in drying the pressed sheets or blocks, in subjecting the dried sheets or blocks to a gradual rise in temperature in a furnace and. in cooling or moulding the heat treated material.
In carrying the invention into effect and in the v preferred manner, the ceramic ingredients employed in the manufacture of the improved vitreous material consist of cryolite, barium carbonate, potassium carbonate, soda ash and boric acid, the preferred proportions being by weight as follows:
Per cent Cryolite, 3NaF,A1Fa 20 Barium carbonate, BaCOa 10 Potassium carbonate, K200: 13 Soda ash", NarCOa 9 Boric acid, H3303 48 Alternatively the above ingredients may be varied by including a small proportion of felspar, not exceeding 5% by weight.
These materials are first ground to a fine powder, and after grinding and thoroughly mixing, these materials are passed through a drying furce in which a temperature of 500 C. is mainined until a white glass frit is formed.
The mica product is ground, care being taken grinding that the particle size is consistent and whilst the ground product should be capable of passing a mesh of 100 x 100 per square inch, the particles should not be smaller than this, as otherwise the finished product is apt to disintegrate under heat, with a corresponding loss. in di-electric properties. The frit is also ground tothe same .desreeasthe mics. and both are then mixed witha'quantity of heat treated Proportions of the'mix- Mycalex" the preferredture being as follows:
These materials in a .coldldry state are mixed for about five minutes, followed by a"furth'er period of mixing of'about 10 minutes, during which 8% by volume of water'ls sprayedupon balls of one or other-of the ingredients are found. to form during: the "mixing process. In'order to break downthese balls and'form a homogeneous mixture the mixed powders are pressed through a sieve of .5 mm. mesh and the mixture is also allowed to cool by this procedure in readiness for the pressing operation which follows.
The pressing of the mixture of mica, Mycalex and frit is carried out as a cold process, the
mould cavity being filled with the desired amount of powder according to the size and thickness of the billet or other article to be pressed.
In order that air pockets do not remain after I the'pressing operation, the operator kneads and stirs the powder in the mould cavity with ex-.
tended fingers until satisfied that the powder-is evenly distributed over the area of the said cav-V ity. The base of the mould cavity and the top of the charge of powder are preferably covered, before pressure is applied, with sheets of paper v in order to overcome the suction effect produced when the platens of the press are parted, thereby preventing the laminae of the completed billet being drawn apart. Pressure is applied to the powder at approximately 1 tons per square inch and produces solid billets which are placed in racks to dry over a period up to seven days,
this drying period being essential, as if placed in a furnace while still in a damp condition, blisters are liable to form on the surfaces of the billet as the result of the heat treatment which blisters crack and open to expose the laminae to oxidisation instead of forming a homogeneous mass.
The operation of cold pressing is carried out slowly so as to expel air gradually from the mass 56 of powder being pressed and it has been found
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2303244X | 1939-08-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2303244A true US2303244A (en) | 1942-11-24 |
Family
ID=10903430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US351170A Expired - Lifetime US2303244A (en) | 1939-08-15 | 1940-08-03 | Manufacture of insulating material |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2303244A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2465388A (en) * | 1945-12-11 | 1949-03-29 | Mycalex Corp Of America | Process for drilling glass-bonded mica |
| US2548212A (en) * | 1947-11-19 | 1951-04-10 | Shawinigan Chem Ltd | Process of briquetting and product thereof |
| US2669764A (en) * | 1950-05-01 | 1954-02-23 | Mycalex Company Ltd | Manufacture of micaceous insulating materials |
| US3253611A (en) * | 1962-11-13 | 1966-05-31 | Firewell Company Inc | Controller for cryogenic liquids |
| US3457091A (en) * | 1965-03-19 | 1969-07-22 | Haveg Industries Inc | Glass bonded alumina |
-
1940
- 1940-08-03 US US351170A patent/US2303244A/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2465388A (en) * | 1945-12-11 | 1949-03-29 | Mycalex Corp Of America | Process for drilling glass-bonded mica |
| US2548212A (en) * | 1947-11-19 | 1951-04-10 | Shawinigan Chem Ltd | Process of briquetting and product thereof |
| US2669764A (en) * | 1950-05-01 | 1954-02-23 | Mycalex Company Ltd | Manufacture of micaceous insulating materials |
| US3253611A (en) * | 1962-11-13 | 1966-05-31 | Firewell Company Inc | Controller for cryogenic liquids |
| US3457091A (en) * | 1965-03-19 | 1969-07-22 | Haveg Industries Inc | Glass bonded alumina |
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