US2281173A - Insulator and method of producing conducting coating thereon - Google Patents
Insulator and method of producing conducting coating thereon Download PDFInfo
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- US2281173A US2281173A US313211A US31321140A US2281173A US 2281173 A US2281173 A US 2281173A US 313211 A US313211 A US 313211A US 31321140 A US31321140 A US 31321140A US 2281173 A US2281173 A US 2281173A
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- 239000012212 insulator Substances 0.000 title description 48
- 238000000576 coating method Methods 0.000 title description 34
- 239000011248 coating agent Substances 0.000 title description 33
- 238000000034 method Methods 0.000 title description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 34
- 238000010304 firing Methods 0.000 description 22
- 239000000463 material Substances 0.000 description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 18
- 239000000203 mixture Substances 0.000 description 18
- 239000000919 ceramic Substances 0.000 description 17
- 229910052742 iron Inorganic materials 0.000 description 17
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 16
- 150000002484 inorganic compounds Chemical class 0.000 description 13
- 229910010272 inorganic material Inorganic materials 0.000 description 13
- 230000000737 periodic effect Effects 0.000 description 12
- 229910052573 porcelain Inorganic materials 0.000 description 12
- 239000000377 silicon dioxide Substances 0.000 description 9
- 229910052759 nickel Inorganic materials 0.000 description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 7
- 229910052791 calcium Inorganic materials 0.000 description 7
- 239000011575 calcium Substances 0.000 description 7
- 229910017052 cobalt Inorganic materials 0.000 description 7
- 239000010941 cobalt Substances 0.000 description 7
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- 239000004927 clay Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 239000008199 coating composition Substances 0.000 description 3
- 235000014413 iron hydroxide Nutrition 0.000 description 3
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 description 2
- 102100035683 Axin-2 Human genes 0.000 description 1
- 101700047552 Axin-2 Proteins 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 241000276489 Merlangius merlangus Species 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000012671 ceramic insulating material Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 235000012204 lemonade/lime carbonate Nutrition 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/50—Insulators or insulating bodies characterised by their form with surfaces specially treated for preserving insulating properties, e.g. for protection against moisture, dirt, or the like
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T428/24917—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including metal layer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T428/24926—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including ceramic, glass, porcelain or quartz layer
Definitions
- This invention relates to an insulator having a dielectric ceramic body and a resistant coating that is partially conducting, withmore particular reference to high tension insulators, the surfaces of which are sometimes partially coated with a conducting glaze to make theinsulator' free from noise and radio interference by eliminating surface leakage or corona, and it has for its object to afford a coating or glaze that can easily be controlled and applied, which is economical to produce and suillciently conductive to dampen out corona and overcome radio interference, and which is permanently bonded or attached to the body of the insulator so that it is not subject to oxidation, chipping or wear, but is as permanent and enduring as the porcelain insulator body it- "If;
- One purpose of the invention is to utilize coating materials that are comparatively inexpensive and can be readily applied to an insulator body without increasing its cost of production over previous methods, so as to afford a glaze of stable character that is not soluble oraiiected by any acids and will maintain its conductive efiiciency indefinitely.
- Another object of the invention is to afford a coating material that is applicable to insulators formed of porcelain or other silica-containing materials, and which during the firing process becomes a permanent and integral part of the body of the insulator by a chemical action, but without in any way affecting or lessening the nonconductivity of the body of the insulator, while providing a glaze that is sufliciently conductive to prevent energy losses and radio interference.
- the drawing illustrates a sectional view of a conventional type of insulator made by molding and thereafter firing a body of silica-containing material such as clay, feldspar and fiint, and illustrating applied to a portion of its surface thereof a coating in accordance with the invention.
- silica-containing material such as clay, feldspar and fiint
- a successful and practical coating that is sufiiciently resistant and conductive for the purpose, can be obtained by using a composition including as one of its materials lime, or calcium carbonate, commercially known as whiting, or any salt of calcium, or other of the materials in its group, that is unstable and will break down in firing, together with magnesia, and iron or steel filings, or iron Imetals including iron,
- the coating composition may be applied to either a glazed or unglazed surface of an insulator, and various materials may be used to obtain the desired result.
- Mendeleefs' Periodic Table namely magnesium, calcium, zinc, strontium, cadmium and barium, may be used, either in sulfate, sulfide, fluoride, or any unstable salt.
- composition of materials that has been found. to produce a satisfactory and eflicient coating contained the following:
- compositions have been usedsuccessfully containingthe various alternative materials hereinabove referred to, in place of iron andcalcium.
- a composition such as described, it is fired in an oxidizing atmosphere, subject to temperatures of from approximately .2000 F. to 2500" F., such as are usually employedin the production of in sulators of this general character.
- magnesia may be p omitted, and any material from group II of the form of a carbonate,
- a high tension electric porcelain insulator having a fired surface conducting coating consisting of a material derived by firing a coated composition containing an inorganicrcoi npound of an element of group II of the (periodic table and an inorganic compound of an element from VIII of the periodic table which contains iron, cobalt, and nickel.
- a high tension electric porcelain insulator having a fired surface conducting coating consisting of a material derived by firing a coated composition containing an inorganic compound of, an element of group II of the periodic table, an inorganic'compound of an element from the section of group VIIIof the periodic table which, cobalt, and nickel; and silicon.
- a high tension electric porcelain insulator having a fired surface conducting coating consisting of a material derived by firing a coated composition containing inorganic compounds of calcium and iron.
- a high tension electricporcelain insulator having a fired surface conducting coating consisting of a material derived by firing a coated composition containing inorganic compounds of calcium, iron, and silicon.
Description
April 1942- s. L. SANTOMIERI 2,281,173
INSULATOR AND METHOD OF PRODUCING CONDUCTING COATING THEREON Filed Jan. 10, 1940 IN VENT OR. ,SsZasZzkvz/Z- flflzZ-omz'erv wa ATTORNEY.
Patented Apr. 28, 1942 msuu'ron AND METHOD or rnonucmo counoc'rmo cos'rmc mason Sebastian L. Santomierl, Columbus, Ohio, as-
signor to Victor Insulators, lne., Victor, N. Y., a corporation of New York Application January 10, 1940, Serial No. 813,211
11 Claims.
This invention relates to an insulator having a dielectric ceramic body and a resistant coating that is partially conducting, withmore particular reference to high tension insulators, the surfaces of which are sometimes partially coated with a conducting glaze to make theinsulator' free from noise and radio interference by eliminating surface leakage or corona, and it has for its object to afford a coating or glaze that can easily be controlled and applied, which is economical to produce and suillciently conductive to dampen out corona and overcome radio interference, and which is permanently bonded or attached to the body of the insulator so that it is not subject to oxidation, chipping or wear, but is as permanent and enduring as the porcelain insulator body it- "If;
It has heretofore been proposed to coat insulators with conducting materials, but such coatings have either been costly to apply or of such character that they quickly wear off or lose their conducting emciency, and it is a particular purpose of the invention to afford a coating or glaze that can be manufactured and applied cheaply and which becomes an integral part of the insulator body, so as to be chemical resisting and completely unaffected by weather or by the usual wear to which an insulator is subjected.
One purpose of the invention is to utilize coating materials that are comparatively inexpensive and can be readily applied to an insulator body without increasing its cost of production over previous methods, so as to afford a glaze of stable character that is not soluble oraiiected by any acids and will maintain its conductive efiiciency indefinitely.
Another object of the invention is to afford a coating material that is applicable to insulators formed of porcelain or other silica-containing materials, and which during the firing process becomes a permanent and integral part of the body of the insulator by a chemical action, but without in any way affecting or lessening the nonconductivity of the body of the insulator, while providing a glaze that is sufliciently conductive to prevent energy losses and radio interference.
It has heretofore been proposed to coat porcelain insulators with a metallic glaze, or with a mixture of metallic and silicate glazes, but these all have the objection that the final or resulting coating is a thin glaze metallic in form and containing free metal, since the metals that have been so proposed are resistant to kiln firing conditions, and the resulting glaze is therefore sub- Ject to abrasion and chemical action which will 55 shorten its life, and it is a particular purpose of this invention to provide a partially conducting glaze or coating that is not of a metallic char-' acter and which contains no free metal, such metal as is introduced into the coating composition in the beginning being united chemically during the kiln firing treatment with the other materials in the coating composition and with the body of the insulator, and thus becoming an integral and permanent part of the insulator body so as to resist any action or wear to the same extent as a ceramic insulating material.
It has also been proposed to coat insulators with glazes containing metallic oxides and to apply a reducing agent after firing to make the coating conductive, but this is a slow and expensive procedure, resulting in only a surface coating in the nature of a thin metal film which will oxidize and wear away in time, before the insulator body has lost its useful life, and it is a particular purpose of the invention to provide a glaze or coating that will have the required conductive characteristic and which at the same time is so united to the ceramic body as an integral part thereof as to wear and function efliciently as long as the insulator body, so that the life of the latter is not reduced by the coating or glaze wearing, chipping, or in any way losing the e!!!- ciency it possesses in the beginning.
so To these and other ends. the invention consists in the construction and procedure that will appear clearly from the following description when read in conjunction with the accompanying drawing, the novel features being pointed out in the claims following the specification.
The drawing illustrates a sectional view of a conventional type of insulator made by molding and thereafter firing a body of silica-containing material such as clay, feldspar and fiint, and illustrating applied to a portion of its surface thereof a coating in accordance with the invention. This is a continuation in part of application filed January 19, 1939, Serial No. 251,777, and the invention is equally applicable to insulators made from any silica-containing ceramic material, as well known in the art.
I have ascertained that a successful and practical coating, that is sufiiciently resistant and conductive for the purpose, can be obtained by using a composition including as one of its materials lime, or calcium carbonate, commercially known as whiting, or any salt of calcium, or other of the materials in its group, that is unstable and will break down in firing, together with magnesia, and iron or steel filings, or iron Imetals including iron,
0! the I ceramic body attached thin metallic film hydroxide, or other material from the-group of that is unstable and will break down in firing, preferably mixed with a sumcient amount by aluminum silicate in the form of clay, which makes the mixture easy to apply to the surface by brushing or spraying thereon, previouslyto the firing operation.
The coating composition may be applied to either a glazed or unglazed surface of an insulator, and various materials may be used to obtain the desired result.
Mendeleefs' Periodic Table, namely magnesium, calcium, zinc, strontium, cadmium and barium, may be used, either in sulfate, sulfide, fluoride, or any unstable salt.
In place of iron, I have'successfully used cobait, or nickel, in unstable form, and may use an unstable compound derived from any material in the section from group VIII of Mendeleefs Periodic Table whi h contains iron, cobalt, and nickel.
Successful results are obtainable by combining an unstable salt of any material in group II, in the form of a carbonate, sulfam, sulfide, fluoride, or otherwise, with an unstable compound derived from any material from the section of group VIII which contains iron, cobalt, and nickel. Where the expression "unstable is used throughout the specification and claims, I intend by this to define a material thatis unstable when subjected to heat and breaks down or decomposes durin the subsequent firing of the insulator body.
It has been found thata coating produced with iron, calcium carbonate, and clay, possesses a high coeflicient of expansion, and in order to limit such expansion, a small amount of zirconium oxide can be added to. the mixture.
As an example, one composition of materials that has been found. to produce a satisfactory and eflicient coating contained the following:
Per cent Iron hydroxide 64.4 Calcium carbonate 23.5 Clay 6.7 Zirconium oxide 5.4
Other compositions have been usedsuccessfully containingthe various alternative materials hereinabove referred to, in place of iron andcalcium. After the molded ceramic body is coated with a composition such as described, it is fired in an oxidizing atmosphere, subject to temperatures of from approximately .2000 F. to 2500" F., such as are usually employedin the production of in sulators of this general character. I
While it can not be stated with certainty what reaction takes place during firing, it is believed that the iron, cobalt, or nickel most likely ceases to function as. a-metal after firing, having become along with the silicon, basic in reaction, and mating with the calcium or other material of its group. The result probably is to produce a,
calcium ferro-silicate, the ferro-silicate taking the place of the carbonate on firing, resulting in a conducting non-metallic glaze that is firmly and permanently bonded to the outer body portion of the insulator and becomes an integral part thereof as distinguished from a mechanically or covering The method and composition may be otherwise modified without departing from the essentials of the invention, and this application is'intended to cover any adaptations or changes, either in 75 iron,
of water and held in suspension the section of group The magnesia may be p omitted, and any material from group II of the form of a carbonate,
-. contains iron,
* the presence of heat; and a clay,
the composition or the procedure in applying it, that come within the purposes of the invention or the scope of the following claims.
I claim:
1. A high tension electric porcelain insulator having a fired surface conducting coating consisting of a material derived by firing a coated composition containing an inorganicrcoi npound of an element of group II of the (periodic table and an inorganic compound of an element from VIII of the periodic table which contains iron, cobalt, and nickel.
2. A high tension electric porcelain insulator having a fired surface conducting coating consisting of a material derived by firing a coated composition containing an inorganic compound of, an element of group II of the periodic table, an inorganic'compound of an element from the section of group VIIIof the periodic table which, cobalt, and nickel; and silicon. 3. A high tension electric porcelain insulator having a fired surface conducting coating consisting of a material derived by firing a coated composition containing inorganic compounds of calcium and iron. I
4. A high tension electricporcelain insulator having a fired surface conducting coating consisting of a material derived by firing a coated composition containing inorganic compounds of calcium, iron, and silicon.
5. The method of producinga high tension."
usual ceramic insulator firing temperature.
6. The method of producing a high tension electric porcelain insulator with a conductin surface which consists in coating the surface of a silica-containing ceramic body with a composition containing an inorganic compound of anelement of group II of the periodic table that is unstable in the presence of heat, and an inorganic compound of an element from the section of group VIII of the periodic table which contains iron, cobalt, and nickel, said compound being unstable in the presence of heat, and thereafter subjecting the insulator body and coating to a usual ceramic insulator firingtemperature.
7. The 'method of producing a high tension electric porcelain insulator witha conducting surface which consists in coating the surface of a silica-containing ceramic body with a compositioncontaining an inorganic compound .of an element of group II of the periodic table which is unstable in the presence of heat, and an inorganic compound of an element from the section of group VIII which contains. iron, cobalt, and nickel, said compound being unstable in and thereafter subjecting the ,insulator body and coating to a usual ceramic insulator firing temperature.v
'8. Theymethod of producing a high tension electric porcelain insulator with a conducting surface which consists in'coating the surface of a silica-containing ceramic body with a composition containing an inorganic compound of an element of group II of the periodic table, and and thereafter subjecting the insulator body and coating to a usual ceramic insulator firing temperature.
9. The method of producing a high tension electric porcelain insulator with a conducting surface which consists in coating the surface of a silica-containing ceramic body with a composition containing an inorganic compound of calcium and iron hydroxide. and thereafter subjecting the insulator body and coating to a usual ceramic insulator firing temperature.
10. The method of producing a high tension electric porcelain insulator with a conducting surface which consists in coating the surface of a silica-containing ceramic body with a composition containing an inorganic compound of an element of group II of the periodic table, iron hydroxide, and a clay, and thereafter subjecting the insulator body and coating to a usual ceramic insulator firing temperature.
11. The method of producing a high tension electric porcelain insulator with a conducting surface which consists in coating the surface of a silica-containing ceramic bodywith a composition containing an inorganic compound of iron which is unstable in the presence of heat, and an inorganic compound of an element of group II of the periodic table which is ustable in the presence of heat, and thereafter subjecting the insulator body and coating to a usual ceramic insulator firing temperature.
SEBASTIAN L. SANTOMIERI.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US313211A US2281173A (en) | 1940-01-10 | 1940-01-10 | Insulator and method of producing conducting coating thereon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US313211A US2281173A (en) | 1940-01-10 | 1940-01-10 | Insulator and method of producing conducting coating thereon |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2281173A true US2281173A (en) | 1942-04-28 |
Family
ID=23214804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US313211A Expired - Lifetime US2281173A (en) | 1940-01-10 | 1940-01-10 | Insulator and method of producing conducting coating thereon |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2281173A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3767843A (en) * | 1972-10-17 | 1973-10-23 | Allis Chalmers | Electrical bushing having means for lowering the power factor |
| US5796048A (en) * | 1994-03-28 | 1998-08-18 | Ngk Insulators, Ltd. | Insulator having conductive surface coating to prevent corona discharge |
| US8568803B2 (en) | 1998-02-13 | 2013-10-29 | Nutramax Laboratories, Inc. | Use of anabolic agents, anti-catabolic agents, antioxidant agents and analgesics for protection, treatment and repair of connective tissues in humans and animals |
-
1940
- 1940-01-10 US US313211A patent/US2281173A/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3767843A (en) * | 1972-10-17 | 1973-10-23 | Allis Chalmers | Electrical bushing having means for lowering the power factor |
| US5796048A (en) * | 1994-03-28 | 1998-08-18 | Ngk Insulators, Ltd. | Insulator having conductive surface coating to prevent corona discharge |
| US8568803B2 (en) | 1998-02-13 | 2013-10-29 | Nutramax Laboratories, Inc. | Use of anabolic agents, anti-catabolic agents, antioxidant agents and analgesics for protection, treatment and repair of connective tissues in humans and animals |
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