US3876455A - Electric insulating porcelain article - Google Patents

Electric insulating porcelain article Download PDF

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Publication number
US3876455A
US3876455A US360423A US36042373A US3876455A US 3876455 A US3876455 A US 3876455A US 360423 A US360423 A US 360423A US 36042373 A US36042373 A US 36042373A US 3876455 A US3876455 A US 3876455A
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US
United States
Prior art keywords
porcelain
article
zircon
weight
coating
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
Application number
US360423A
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English (en)
Inventor
Noboru Higuchi
Yutaka Ogawa
Kyosuke Tunekawa
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.)
NGK Insulators Ltd
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NGK Insulators Ltd
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Filing date
Publication date
Application filed by NGK Insulators Ltd filed Critical NGK Insulators Ltd
Application granted granted Critical
Publication of US3876455A publication Critical patent/US3876455A/en
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    • 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
    • C04B41/5024—Silicates
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
    • H01B19/04—Treating the surfaces, e.g. applying coatings
    • 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
    • H01B3/025—Other inorganic material
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S174/00—Electricity: conductors and insulators
    • Y10S174/01—Anti-tracking
    • 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

  • the electric insulating porcelain article whose excellent electrical resistance properties and mechanical strength are not deteriorated even when used in an atmosphere containing the decomposition products obtained with SF gas is subjected to spark discharge.
  • the electric insulating porcelain article comprises an electric porcelain body and a porcelain coating applied to the surface of the porcelain body, the coating containing not less than 50 by weight of zircon and having a thermal expansion coefficient lower than that of the porcelain body.
  • the invention pertains to an electric insulating porcelain article, which is composed of a generally used electric porcelain body and, applied to the surface thereof, a porcelain coating containing not less than 50 by weight of zircon, and hence is not deteriorated in its excellent insulation resistance and mechanical strength even when used in an atmosphere containing decomposed products of SF gas which have been produced due to spark discharge.
  • An electric insulating porcelain article such as electric insulator, bushing or the like, is ordinarily prepared by applying a glaze to a porcelain body containing a crystal phase consisting of 3 to 35 (by weight based on the weight of said porcelain body; the same shall apply hereinafter) of quartz and 6 to 30 of rnullite; to 45 of cristobalite, 2 to 15 of quartz and 15 to 30 of mullite; 15 to 45 ofcristobalite,'2 to 15 of quartz, 15 to 35 of mullite and 3 to 45 of corundum; up to 35 of quartz, 6 to 30 of mullite and l to 45 of corundum; 3 to 35 of quartz, 6 to 30 of mullite and l to 30 of zircon; or up to 35 of quartz, 6 to 30 of mullite, l to 45 of corundum and l to 30 of zircon. Further, such porcelain body contains a glass phase in addition to such crystal phase as mentioned above.
  • the surface of the glaze is too smooth to apply a resincoating which firmly adhere to the porcelain'article.
  • the surface of an unglazed porcelain body is somewhat coarse, an attempt has been made to apply a resin coating to the surface of such unglazed porcelain body so as to firmly adhere the resin-coating tothe porcelain body.
  • the unglazed porcelain body has no such effect of compression glaze as mentioned previously, so thatthere has been such drawback that no desired mechanical strength can be attained unless the porcelain bodyis made large in size.
  • the thermal expansion coefficient of the resin coating is larger than that of the porcelain body, so that there has been suc-hdrawback that the resin coating is peeled off when the porcelain article is used over a long period of time.
  • zircon porcelain article the whole body of which is composed of a zircon article.
  • the zircon porcelain is narrow in firing temperature range and great in firing deformation, so that it is extremely difficult from the technical standpoint to use the zircon porcelain for commercial scale production of large-sized insulators.
  • the zircon porcelain has had such drawback that it is not suitable for commercial scale production of insulating porcelain articles.
  • the present invention is based on the finding that when a porcelain containing not less than 50 by weight of zircon is coated on a generally used electric porcelain body, the resulting porcelain article is not deteriorated in insulation resistance even when used in an atmosphere containing decomposed products of SF, gas which have been produced due to spark discharge, and gives the same effect as the so-called effect of compression glaze, since the porcelain coating formed on the generally used electric porcelain body is smaller in thermal expansion coefficient than the electric porcelain body.
  • the zircon porcelain as a coating is composed of a glass phase and a crystal phase comprising a major proportion of zircon and a minor proportion of mullite, zirconia, quartz and the like crystals.
  • FIG. 1 is a graph showing the variations in insulation resistance of various electric porcelain bodies in SF, gas contaminated due to spark discharge; and
  • FIG. 2 is a graph showing the variations in insulation resistance of zircon porcelain bodies containing varying amounts of zircon in SF gas contaminated due to spark discharge.
  • zircon porcelain according to the present invention is not deteriorated in insulation resistance even when used in an atmosphere containing decomposed products of SF gas which have been produced due to spark discharge, and why this effect is particularly marked in the case of a zircon porcelain containing not less than 50 by weight of zircon, are as follows:
  • test pieces of 10 mm. in diame- 'ter and mm. in length were prepared from such electric porcelain batches (l) to (3) and zircon porcelain batch as shown in Table 2, and the thus prepared test pieces were individually fired in an ordinary kiln for firing of porcelain insulator to obtain samples.
  • Table 2 bonate, zinc white, etc. on an unfired body of a generally used electric porcelain, which, when fired, comes (wt%) to have such crystal phase as mentioned previously, d f r f ch Tt 20 and then firing at a temperature of 1,250 to 1,350C.
  • CaO 0.19 and M 0.08 Same as above Alumina 50 SiO 3l.6l K 0: 2.52 g. not more than 5.0 by weight of at least one oxide 3 1 0? 9 28-113 2 L04 selected from the group consisting of TiO and Fe O ii E the sum of said oxides (d) to (g) being 1.1 to 12 by shred 10 we1ght and the ratio ZrO,/S1O being 0.8 to 2.0.
  • Synthetic zircon may be used in place of the raw ma- Zircon Zircon sand265 510.: 36.87 MgO: 0.61 terial zircon sand. Porcelain This zircon porcelain coating has a thermal expan- 2. $2,32 ,22 Dolomite 3 45 98 Bao 49 s1on coefficient of 3.9 to 4.9 X 10 /C.
  • the porcelain article according to the present invention can be easily obtained by coating to a thickness of about 0.2 to 0.6 mm.
  • a green layer for zircon porcelain coating comprising a mixture of zircon sand, feldspar,
  • the coating is completely vitrified by firing at the aforesaid temperature to show a water absorption ratio of 0 so that the porcelain article is not de-,
  • the zircon porcelain coating according to the present invention may be applied to the whole surface of the porcelain body, but it is preferable that the coating is applied to at least a surface to be brought into contact with SP gas, and a generally used compression glaze is applied to the remaining surface.
  • Test Example 1 A rod-1ike test piece of mm. in diameter and 120 mm. in length was prepared from a green body for porcelain insulator comprising 37 (by weight; the same shall apply hereinafter) of Amakusa pottery stone, 26 of Tsushima feldspar and 37 of Gaerome clay. Subsequently, the test piece was coated with a green layer of about 0.35 mm. in thickness for zircon porcelain coating comprising 70 of zircon sand, 5 of dolomite, 2 of feldspar; 3 of barium carbonate and 20 of clay, and then fired in a firing kiln at a maximum temperature of 1,300C. to'prepare a sample.
  • Test Example 2 A cylindrical test piece of 100 mm. in outer diameter, 60 mm. in inner diameter and 200 mm. in height was prepared from a green body for porcelain insulator comprising 35 of Amakusa pottery stone, 30 of Tsushima feldspar and 35 of Gaerome clay. Subsequently, the test piece was coated on the inner and outer surfaces with a green layer of about 0.3 mm. in thickness for zircon porcelain coating comprising 63 of zircon sand, 4 of dolomite, 2 of feldspar, 6 of alumina, 3 of barium carbonate, 2 of zinc white and 20 of clay, and then fired in a firing kiln at a maximum temperature of l,300C. to prepare a sample.
  • This sample was measured in variation of insulation resistance at the inner surface in the same manner as in Test Example 1 to obtain the results as shown in ing the atmosphereby continuously effecting spark discharge using-spark discharge electrodes (needle and plane plate) under such conditions as a gap between two electrodes of 2 mm., an applied voltage of 15 kv. and a currentof 5 mA. to obtain the results as shown in (1) of Table 3, in which were also shown the results ner as above, except that the coating according to the present invention was replaced by a generally used insulator glaze of the composition 0.20 K 0. 0.10 Na O. 0.30 CaO. 0.40 MgO. 0.70A1 O 7.00 SiO according (l) of Table 4, in which were also shown the results of measurement in inner pressure strength thereof.
  • the electric insulating porcelain article of the present invention is free from the drawbacks of the conventional electric insulating article, such as insulator or insulating bushing, and can be effectively used over a long period of time as an electric insulating article for electric appliances using SF gas as an insulating medium, without any deterioration in insulation resistance and mechanical strength.
  • the industrial value of the present invention is extremely great.
  • a porcelain electric insulating article comprising a porcelain body and a porcelain coating thereon coming into contact with the decomposition products formed when SP gas is subjected to an electrical spark, the improvement wherein the porcelain coating coming into contact with said decomposition products contains not less than 50% by weight of zircon and has a thermal coefficient of expansion lower than the thermal coefficient of expansion of said body.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Inorganic Insulating Materials (AREA)
  • Glass Compositions (AREA)
US360423A 1972-05-18 1973-05-15 Electric insulating porcelain article Expired - Lifetime US3876455A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47049367A JPS5250399B2 (el) 1972-05-18 1972-05-18

Publications (1)

Publication Number Publication Date
US3876455A true US3876455A (en) 1975-04-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
US360423A Expired - Lifetime US3876455A (en) 1972-05-18 1973-05-15 Electric insulating porcelain article

Country Status (6)

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US (1) US3876455A (el)
JP (1) JPS5250399B2 (el)
CH (1) CH582406A5 (el)
DE (1) DE2325100C3 (el)
FR (1) FR2184991B3 (el)
GB (1) GB1427989A (el)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4465900A (en) * 1983-03-16 1984-08-14 Ngk Insulators, Ltd. High voltage glazed porcelain insulators
CN105484551A (zh) * 2016-01-24 2016-04-13 常熟市谷雷特机械产品设计有限公司 一种用于架设高压输电导线的铁塔
CN107200568A (zh) * 2017-06-01 2017-09-26 合肥尚强电气科技有限公司 一种环保耐候高强度电力绝缘子及其制备方法

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51120317U (el) * 1975-03-27 1976-09-29
JPS5221220A (en) * 1975-08-12 1977-02-17 Toyoda Automatic Loom Works Spure serching device of automatic pouring machine for casting
JPS52106329A (en) * 1976-03-05 1977-09-06 Hitachi Ltd Method of detecting gate of mold
JPS5314915U (el) * 1976-07-19 1978-02-07
US4552800A (en) * 1979-03-02 1985-11-12 Blasch Precision Ceramics, Inc. Composite inorganic structures
CA1161238A (en) * 1979-03-02 1984-01-31 Robert Smith-Johannsen Inorganic composite structures
JPS55153664A (en) * 1979-05-15 1980-11-29 Toyota Motor Corp Sprue searching device of automatic pouring machine for casting
DE3444627A1 (de) * 1984-12-07 1986-06-19 Hans Dipl.-Ing. 4030 Ratingen Liebermann Hochfeste tonerdeporzellanmasse fuer hochspannungsisolatoren
DE102004045752B3 (de) * 2004-09-21 2006-05-04 Forschungszentrum Karlsruhe Gmbh Verwendung einer Keramik als Dentalkeramik

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2157100A (en) * 1938-12-20 1939-05-09 Locke Insulator Corp Glazed ceramic insulator and the like
US2170387A (en) * 1937-05-25 1939-08-22 Power Patents Co Glaze
US2325553A (en) * 1941-04-14 1943-07-27 Scovill Manufacturing Co Refractory and method of producing the same
US2534327A (en) * 1946-09-06 1950-12-19 Katherine L Whitman Vitrifying refractory composition and product
US3024303A (en) * 1960-03-09 1962-03-06 Ohio Brass Co Glazed insulator which comprises a ceramic body and a primary coat under the glaze which has a lower coefficient of thermal expansion than the ceramic body
US3078186A (en) * 1960-07-26 1963-02-19 Westinghouse Electric Corp Ceramic potting composition and method of encapsulating an electrical article therewith
US3166430A (en) * 1961-12-07 1965-01-19 Harshaw Chem Corp Iron ceramic pigment
US3189475A (en) * 1962-12-20 1965-06-15 Glidden Co Pink ceramic stain and process
US3281270A (en) * 1962-10-22 1966-10-25 Westinghouse Electric Corp Glass composition and thermoelectric element coated therewith
US3528835A (en) * 1964-12-28 1970-09-15 Thann & Mulhouse Preparation of colored ceramic pigments based on synthetic zircon
US3577252A (en) * 1967-09-13 1971-05-04 Goldschmidt Ag Th Process of producing zirconium silicate ceramic coloring substances
US3787218A (en) * 1970-10-27 1974-01-22 Owens Illinois Inc Zircon containing printing paste for overglaze coating of microelectronic circuits on ceramic substrates
US3804666A (en) * 1971-12-13 1974-04-16 Scm Corp Glazed ceramic ware
US3808042A (en) * 1970-06-05 1974-04-30 Owens Illinois Inc Multilayer dielectric
US3826659A (en) * 1971-05-05 1974-07-30 Nat Res Dev High zirconia containing glass ceramics

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2170387A (en) * 1937-05-25 1939-08-22 Power Patents Co Glaze
US2157100A (en) * 1938-12-20 1939-05-09 Locke Insulator Corp Glazed ceramic insulator and the like
US2325553A (en) * 1941-04-14 1943-07-27 Scovill Manufacturing Co Refractory and method of producing the same
US2534327A (en) * 1946-09-06 1950-12-19 Katherine L Whitman Vitrifying refractory composition and product
US3024303A (en) * 1960-03-09 1962-03-06 Ohio Brass Co Glazed insulator which comprises a ceramic body and a primary coat under the glaze which has a lower coefficient of thermal expansion than the ceramic body
US3078186A (en) * 1960-07-26 1963-02-19 Westinghouse Electric Corp Ceramic potting composition and method of encapsulating an electrical article therewith
US3166430A (en) * 1961-12-07 1965-01-19 Harshaw Chem Corp Iron ceramic pigment
US3281270A (en) * 1962-10-22 1966-10-25 Westinghouse Electric Corp Glass composition and thermoelectric element coated therewith
US3189475A (en) * 1962-12-20 1965-06-15 Glidden Co Pink ceramic stain and process
US3528835A (en) * 1964-12-28 1970-09-15 Thann & Mulhouse Preparation of colored ceramic pigments based on synthetic zircon
US3577252A (en) * 1967-09-13 1971-05-04 Goldschmidt Ag Th Process of producing zirconium silicate ceramic coloring substances
US3808042A (en) * 1970-06-05 1974-04-30 Owens Illinois Inc Multilayer dielectric
US3787218A (en) * 1970-10-27 1974-01-22 Owens Illinois Inc Zircon containing printing paste for overglaze coating of microelectronic circuits on ceramic substrates
US3826659A (en) * 1971-05-05 1974-07-30 Nat Res Dev High zirconia containing glass ceramics
US3804666A (en) * 1971-12-13 1974-04-16 Scm Corp Glazed ceramic ware

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4465900A (en) * 1983-03-16 1984-08-14 Ngk Insulators, Ltd. High voltage glazed porcelain insulators
CN105484551A (zh) * 2016-01-24 2016-04-13 常熟市谷雷特机械产品设计有限公司 一种用于架设高压输电导线的铁塔
CN107200568A (zh) * 2017-06-01 2017-09-26 合肥尚强电气科技有限公司 一种环保耐候高强度电力绝缘子及其制备方法

Also Published As

Publication number Publication date
DE2325100B2 (de) 1975-02-20
CH582406A5 (el) 1976-11-30
JPS5250399B2 (el) 1977-12-23
DE2325100C3 (de) 1975-10-02
GB1427989A (en) 1976-03-10
JPS4913699A (el) 1974-02-06
FR2184991B3 (el) 1976-05-14
DE2325100A1 (de) 1973-12-06
FR2184991A1 (el) 1973-12-28

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