Abstract: A stator winding insulation for improving the dielectric and thermal properties of a main insulation of a conductor bar of an electric machine. The stator winding insulation includes a mica band having at least one layer-like carrier composed of longitudinal threads and transverse threads and a mica-containing layer fixed to at least one face of the carrier with the aid of a binder. In the layer-like carrier, the volume ratio of the longitudinal threads to the transverse threads is greater than or equal to 2.5:1 and a weight ratio of the mica in the mica-containing layer to the layer-like carrier in the mica band is greater than or equal to 6:1.

Abstract: A polymer insulator having a core member, an insulation overcoat member arranged on an outer surface of the core member, and a securing metal fitting fixed to an end portion of the core member in such a manner that the end portion is contacted with the insulation overcoat member is disclosed. The disclosed polymer insulator further includes a seal portion arranged at a boundary between the insulation overcoat member and the securing metal fitting, which is made of a sealing agent in which 80-250 parts by weight of ATH (Alumina trihydrate, Al.sub.2 O.sub.3.3H.sub.2 O) is included with respect to 100 parts by weight of a polymer component. Therefore, the polymer insulator according to the invention has an improved tracking-erosion resistance performance.

Abstract: A silicone rubber composition is obtained by blending (A) 100 parts by weight of an organopolysiloxane composition of the addition reaction curing type with (B) about 30-400 parts by weight of aluminum hydroxide which has been surface treated with an organosilane or organosilazane substantially free of an aliphatic unsaturated group or a partial hydrolyzate thereof so that the aluminum hydroxide has 0.01-2% by weight of carbon affixed thereto. The composition maintains silicone rubber properties even though it is loaded with large amounts of aluminum hydroxide. It cures into a silicone rubber having improved high-voltage electrical insulating properties and thus suited for use as high-voltage electrical insulators.

Abstract: A gas insulated switchgear has a container which is filled with an insulating gas, a conductor disposed with the container, an insulator for supporting the conductor. An outer periphery of the insulator is made smooth so as to improve a dielectric strength of the device. The insulator is made of an organic substance base and an inorganic material filler added to the base. In order to improve the dielectric strength, the filler is atomised or the insulator is coated.

Abstract: The invention relates to a high voltage insulator of ceramic material, which includes a longitudinal shank having molded sheds and to whose ends of the shank metal caps are shrink-fitted. The ends of the longitudinal shank are enlarged so that the diameter of the enlarged ends is at least 1.05 times the diameter of the longitudinal shank. The cylindrical surface, and the end face of the enlarged ends of the longitudinal shank are machined.

Abstract: An insulator including an insulator body, a metal fitting secured to the insulator body via cement material, a conductive layer provided on the insulator body, the conductive layer including a first exposed portion and a second portion embedded in the cement material, and a conductive covering film provided on the second portion of the conductive layer. A conductive grain layer is on the second portion of the conductive layer and is covered by the conductive covering film. According to the present invention, the conductive covering film is more flexible than the second portion of the conductive layer. The present insulator has a simple construction, is easy to produce, and assures continued electrical conduction through the cement material over time.

Abstract: An explosion-proof porcelain housing for use in a gas-filled insulating apparatus, comprising a porcelain housing body, and a first and second films. The first film is made of a first insulating material having low hardness and high elasticity, and is bonded to an inner surface of the porcelain housing body. The second film is made of a second insulating material having high hardness and high mechanical strength, and is bonded to an inner surface of the first film. A process for producing such an explosion-proof porcelain housing is also disclosed.

Abstract: According to this invention, there is disclosed a thermal conductivity substrate which includes an aluminum nitride sintered body and a coating layer formed on the body of aluminum phosphate and having a surface roughness of 1 .mu.m or less, and which has excellent humidity resistance and chemical resistance.

Abstract: A liquid adhesive comprising a dispersion of the following component (b) in a solution of the following component (a) in an organic solvent:(a) a piperazinylethylaminocarbonyl-containing butadiene-acrylonitrile copolymer(b) a maleimide compound having at least two maleimide groups.An insulating pattern or insulating layer is formed by applying the liquid adhesive onto an electronic part by a dispensing or screen printing method, followed by thermally curing.

Abstract: An electromagnetic wave shielding building material is disclosed, the building material comprising an electrically conductive concrete which has electromagnetic wave shielding properties and comprises a hydraulic inorganic material and carbon fibers of 0.6-3% by weight. It is possible to easily produce the building material having good electromagnetic wave shielding functions at low cost.

Abstract: A composite link and insulator, and method of construction, includes a fiberglass body. The body is formed by coating glass fibers with a liquid resin and winding the fibers around a plurality of tubular fittings or bushings in two layers, a first extending longitudinally of the body and the second transversely and around the first. A polymer shield layer and weathersheds are injection molded over the fiberglass body to create an insulator.

Abstract: An oil comprising an amino-modified silicone fluid containing an amino group with an amine equivalent of 10,000 to 200,000 g/mol and having a viscosity of 10 to 100,000 centistokes at 25.degree. C. is effective in preventing any electric contact failure in relays, switches, motors, corotrons and similar electric elements.

Abstract: A hollow porcelain insulator including an elastic insulating layer having a tensile strength of at least 150 kg/cm.sup.2 and a thickness of at least 2 mm for improving an explosion preventing property.

Abstract: An epoxy resin composition comprising a novolak type epoxy resin which is produced from a substituted-phenol novolak and epihalohydrin, and is 0.15 or less in a maximum absorbance of a 3% (W/V) dichloromethane solution of the epoxy resin, the absorbance being measured at a wave number of between 3570 and 3600 cm.sup.-1 with an infrared spectrophotometer having a cell of 2 mm length, which is useful particularly in encapsulating and laminating applications in electronic fields.

Abstract: Process for reducing the water vapour diffusion in a plastics composite insulator consisting of several layers by incorporation of at least one mica-containing layer as diffusion barrier in the form of a surface or intermediate layer on at least one plastics body, constituting the composite insulator.

Abstract: A module for packaging and electrically interconnecting integrated circuit chips comprises: a porous ceramic substrate which has a major surface that is pitted by a portion of the pores. Voltage planes and ground planes lie internal to the substrate, and metal filled via holes feed through the substrate. A second material fills the pores in the major surface to form a pit free surface. This second material is of a type which resists abrasion substantially less than the ceramic substrate. And metal lines are disposed over the pit free surface for interconnecting the metal filled via holes to the integrated circuits.

Abstract: A method of making rings which includes the steps of placing tubes into a container, filling the container with a bonding material in liquid form, solidifying the bonding material within the container, slicing the container into wafers and then removing the bonding material from the wafers leaving the rings as a residual product. The wafers can also be metalized in order to metalize the upper and lower faces of the rings embedded therein.

Abstract: A method of manufacturing an improved electrical high voltage coated insulator is described. The method involves applying and curing a one-part, room temperature curable silicone composition to the surface of an insulator, the insulator surface having a minimum designated arc resistance. The silicone composition is the product obtained by mixing in the substantial absence of moisture a specified polydimethylsiloxane fluid containing hydroxyl radicals, finely divided aluminum hydroxide filler, a silane of the formula R.sub.b Si(ON.dbd.X).sub.4-b and an optional condensation catalyst. The coating cures on exposure to atmospheric moisture to produce a surface adhered onto the insulator that resists the development of leakage currents and flashover failure upon exposure to electrical stress, moisture, contamination, and other outdoor weathering stresses.

Abstract: Passivated and low scatter acoustic wave devices comprise surface acoustic wave (SAW) and shallow bulk acoustic wave (SBAW) devices having transducers composed of oxidizable metal and layers of metal oxide on conventional acoustic wave substrates. Passivated transducers are achieved by forming a layer of oxide on an existing transducer. The method may be used to passivate a device packaged in a non-oxidizable package with oxidizable wire leads, thus combining complete protection with efficient manufacturing operations. Low scatter SAW transducers are achieved by forming the transducer and the interstitial insulating layer from a single layer of oxidizable metal by means of masking and oxidation operations.

Abstract: A method of preparing an antistatic coating exhibiting a desired value of surface resistivity which is substantially stable with respect to time takes as its starting point a commercial antistatic product having a synthetic resin base and substantially free from metallic particles but of which the surface resistivity, measured after mixing with its hardener and drying, is very much below the desired value. A compatible insulating resin is added to this product so as to raise the surface resistivity, still measured after mixing with the hardener and drying, to a value much higher than the desired value. The resulting product is then subjected to an accelerated ageing treatment causing a reduction in surface resistivity with terminal asymptotic development to the level of the desired value. Such a coating may be applied to radomes and other aircraft surface elements, and has the advantage that its conductivity does not increase appreciably with age.

Abstract: An insulator with a tin oxide semiconductor glaze coating has a portion at least 100.mu. thick extending from the glaze surface in which the ratio of the maximum to the minimum volume resistivity is not more than 30. It is found that such glazes display marked improvement in resistance to deterioration under unfavorable conditions.

Abstract: This invention relates to a process for improving heat insulating articles containing silicon dioxide having a surface area of at least 50 m.sup.2 /g, opacifiers and, if desired, inorganic fibers which comprises treating the surface of the insulating articles with at least one organosilicon compound containing from 1 to 4 silicon atoms to render the same hydrophobic.

Abstract: The ability of high voltage insulating devices, such as electrical transmission line suspension insulators, to resist the development of excessive leakage currents is improved by coating the surface with specific silicone fluids.

Abstract: The invention relates to an electrical insulator coated with a semi-conducting tin oxide system glaze layer wherein the glaze layer contains 0.05 to 10 percent by weight of at least one metal oxide selected from the group consisting of niobium oxide, tantalum oxide, titanium oxide, zirconium oxide, yttrium oxide and tungsten oxide. The additional metal oxide reduces the dependance of resistance on the environmental temperature.

Abstract: The disclosure relates to a method for diffusing a coating of manganese powder and titanium powder into a ceramic to improve its voltage hold off withstanding capability. The powder coated ceramic is fired for from about 30 to about 90 minutes within about one atmosphere of wet hydrogen at a temperature within the range of from about 1450.degree. to about 1520.degree. C to cause the mixture to penetrate into the ceramic to a depth on the order of a millimeter.

Abstract: Switch gear containing as electrical insulant a shaped polymeric material formed of repeating units having the structure --Ar--SO.sub.2 --.

Abstract: Transformer parts containing as electrical insulant a shaped polymeric material formed of repeating units having the structure --Ar--SO.sub.2 --.

Abstract: An insulating coating composition is described which prevents deterioration of the insulating ability of newly fabricated material and when applied will also restore insulation characteristics to material presently in use. The composition comprises a mixture of1. a main resinous coating of a thermoplastic resin;2. a cation exchange resin which may be either strongly acidic, i.e., one containing sulfur type, sulphonic acid radicals or weakly acidic, i.e., one containing carboxyl groups or phenolic hydroxyl groups; and3. an anion exchange resin which may be either strongly basic, i.e., one containing quaternary ammonium radicals or weakly basic, i.e., one containing amine radicalsA method of arresting or preventing deterioration of insulating coatings is also disclosed by the use of the above materials which when applied will remove disassociated ions which, in turn, prevent formation of an electroconductive film on the surface of the coating.

Abstract: A weather-resistant high-voltage electrical insulator appliance, or at least a portion thereof which is exposed to the atmosphere, is formed of a solvent-free aliphatic polyurethane which is at least substantially free of aromatic groups.