353results about "Quartz/glass/vitreous enamels" patented technology

Described herein is a method for removing at least a portion of the carbon-containing species within an organosilicate (OSG) film by treating the OSG film with a chemical, such as but not limited to an oxidizer, exposing the OSG film to an energy source comprising ultraviolet light, or treating the OSG film with a chemical and exposing the OSG film to an energy source.

A method for insulating an article requiring resistance against repeated exposure to temperatures exceeding 900° C. uses saline soluble, non-metallic, amorphous, inorganic oxide, refractory fibrous materials as thermal insulation. The compositions that can be used for that purpose include vitreous fibers based on SiO₂, CaO, M_gO, and optionally, A₂O₃.

A coating liquid for forming a low dielectric constant amorphous silica-based coating film with a dielectric constant of 3.0 or below and a film strength (Young's modulus) of 3.0 GPa or more, and also having a smooth surface with an excellent hydrophobicity. The coating liquid contains (1) a silicon compound obtained by hydrolyzing bis(trialcoxysilyl)alkane (BTASA) and alcoxysilane (AS) in the presence of tetraalkylammoniumhydroxide (TAAOH), or (2) a silicon compound obtained by hydrolyzing bis(trialcoxysilyl)alkane (BTASA), alcoxysilane (AS) and tetraalkylorthosilicate (TAOS) in the presence of tetraalkylammoniumhydroxide (TAAOH).

The present invention facilitates the thermal conductivity of fabrics by surface coating of the fabrics with high thermal conductivity materials 6. The fabrics may be surface coated when they are individual fibers or strands 4, bundles of strands, formed fabric or combinations therefore. A particular type of fibrous matrix used with the present invention is glass. Some fabrics may be a combination of more than one type of material, or may have different materials in alternating layers. HTC coatings of the present invention include diamond like coatings (DLC) and metal oxides, nitrides, carbides and mixed stoichiometric and non-stoichiometric combinations that can be applied to the host matrix.

A method for producing a porous material exhibiting temporal stability includes the step of forming a primary material containing a matrix precursor for forming the matrix of the porous material and a porogen for forming pores; the step of removing the porogen from the primary material to form reactive sites exposed at the surface of the matrix; and the step of reacting the reactive sites with an inactivation promoter to inactivate the reactive sites. For a porous material hard to shrink even after heat treatment, the method includes the step of forming a primary material including a matrix formed of a matrix precursor and a pore-forming portions formed of a porogen; the step of supplying an additional matrix precursor for growing the matrix, dissolved in a supercritical or subcritical fluid; and the step of removing the porogen from the pore-forming portions.

Disclosed herein is an article comprising an electrical component and an electrically insulating layer disposed upon the electrical component, wherein the electrically insulating layer comprises a thermosetting polymer and a nanosized filler, wherein the nanosized filler comprises metal oxide and diamond nanoparticles that have an average largest dimension of less than or equal to about 200 nanometers.

The invention adopts a dry mica tape whole impregnation type VPI (vacuum pressure impregnation) insulation process for stator. It comprises: binding up with dry mica tape; after cog leaves the production line, the whole rotator is impregnated with solventliss epoxy in vacuum pressure condition to form a composite insulation structure of VPI process. It features: the epoxy of the insulation structure contains unsaturated bond, and after adding reactive diluent, the whole impregnation insulation epoxy with low viscosity, hypertonicity and wide adaptation is obtained.

A dielectric ceramic composition comprises as a main component, Cu oxide, Si oxide and one selected from the group consisting of Zn oxide alone and a combination of Mg oxide and Zn oxide, as a subcomponent, a glass component including B oxide and at least one selected from the group consisting of Si oxide, Ba oxide, Ca oxide, Sr oxide, Li oxide and Zn oxide, and having a glass softening point is 750° C. or less, wherein a content of said glass component is 1.5 to 15 wt % with respect to 100 wt % of said main component.

According to the present invention, a dielectric ceramic composition can be provided which is available to be sintered at low temperature (for example, 950° C. or lower) while comparatively decreasing contents of a glass component, which shows good properties (specific permittivity, loss Q value and insulation resistance), and which is available to perform cofiring different materials.

The invention provides a chrome-free insulating coating composition and a preparation method and an oriented silicon steel plate. The coating composition comprises the following components of, by weight, 100 parts of phosphate solutions, 1-5 parts of molybdate, 50-150 parts of silica sols, 3-13 parts of selenium dioxide, 1-10 parts of metallic oxide and/or metal hydroxide, 5-15 parts of organic acid, 1-6 parts of boric acid and 100-300 parts of water. The preparation method of the composition comprises the steps that the phosphate solutions, the boric acid and the water are added; the selenium dioxide and the organic acid are sequentially added; and the metallic oxide and/or metal hydroxide and the molybdate are added, then the silica sols are added, and the composition is obtained. The oriented silicon steel plate comprises a pedestal and a chrome-free insulating coating formed on the surface of the pedestal, and the chrome-free insulating coating is obtained by coating the chrome-free insulating coating composition on the surface of the pedestal. The chrome-free insulating coating has extremely high interlayer resistance, surface hardness and surface tension and shows the excellent magnetic property improved effect.

The invention relates to an electric insulation material (3) formed by a porous fibrous matrix that is impregnated with an impregnation medium (2) containing filler particles (1) having higher thermal conductivity than the impregnation medium and having at least one dimension smaller than 1m, preferably having at least one dimension smaller than 100 nm, the fibrous matrix (4) being at least partly penetrated by such filler particles (1) of the impregnation medium (2).

The invention discloses environment-friendly glass frit and a preparation method thereof. The glass frit comprises the following components in percentage by weight: 55-75% of lead-free glass powder, 10-20% of carriers, 5-20% of pigment mixed liquor, 2-10% of solvents, 1-5% of plasticizers and 0.5-2% of dispersing agents. In the invention, the insulativity, the acid resistance and the printability of the product can be adjusted by changing the addition ratio of the glass powder; the viscosity and the printability of the product can be adjusted by changing the addition ratio of the organic carriers; the plasticity, the leveling property and the printability of the product can be adjusted by changing the addition ratio of the plasticizers; and the pollution-free product with good flatness and insulating property is obtained under the condition of sintering at 530-600 DEG C.

A stator bar. The stator bar may include a conductor, a layer of insulation positioned about the conductor, and a high thermal conductivity varnish to bond the layer of insulation to the conductor.

The invention discloses a high-thermal-conductivity dry mica tape, and the dry mica tape consists of mica paper, an adhesive layer, and a fiber cloth layer. Moreover, the mica paper, the adhesive layer and the fiber cloth layer are sequentially overlapped from the bottom to the top. The surface of the fiber cloth layer is uniformly coated with a heat conduction filling material, and the adhesive layer and the fiber cloth layer coated with the heat conduction filling material are overlapped. The preparation method for the mica tape comprises the steps: firstly carrying out the surface treatment of a selected heat conduction filling material through employing a surface treating agent; secondly dispersing the processed heat conduction filling material in an adhesive uniformly, and enabling the obtained adhesive liquid containing the filling material to coat the surface of prepared fiber cloth; thirdly carrying out the baking of the fiber cloth coated with the adhesive liquid, coating one face of the surface with the adhesive, carrying out the surface treatment of the composite mica paper through the adhesive, and obtaining an initial finished product of the mica tape; finally carrying out baking, winding and cutting, and obtaining the finished product of the high-thermal-conductivity dry mica tape. The high-thermal-conductivity dry mica tape is excellent in electrical performances and composite performances, is not layered, does not cause powder to fall, and is stable in quality.

The invention discloses a laminated toughened glass insulator and a preparation method thereof. The insulator is formed with soda-lime glass or ceramic white porcelain glass as the center and externally coated with aluminosilicate glass or low borosilicate glass. The section structure comprises a first and a third layer of aluminosilicate glass or low borosilicate glass; a middle layer of soda-lime glass or ceramic white porcelain glass. A double layer melting furnace is adopted to melt glass raw materials and form glass material base and then a laminated toughened glass insulator is obtained which has a transparent external layer and a blue middle after forming and annealing. The insulator is characterized by more resistance to external impact, no easy occurrence of unfilled corner, fracture and other phenomenon, no generation of cracking, resistance to temperature difference of over 150 DEG C, hard and fine surface without pores, easy self-cleaning, high strength, is bright (like a new one) after long time of outdoor use and has important significance for ensuring the normal operation of electrical power systems.

The invention relates to a polymer insulator with uniform hole distribution on the surface and a preparation method thereof. The method mainly includes the following steps: a composite material with uniform oxide particle distribution is obtained through a polymerization reaction by taking fumed silica as a thixotropic agent and oxide particles ranging from tens of nanometers to several microns as a surface pore-forming agent in polymer monomer solution; and after the composite material is machined into a polymer insulator, the oxide particles on the surface are etched and removed by a chemical etching method to obtain a polymer insulator with uniform hole distribution on the surface. By adjusting the size and mass ratio of the oxide particles, control on the hole size and hole density distribution on the surface of the polymer insulation material is realized, the vacuum surface flashover characteristic of the insulator is improved, and the surface breakdown voltage of the insulator is improved. The vacuum surface flashover field strength of an insulator with a special surface structure is improved by 20-50% compared with a pure polymer insulator.

Transposed conducting wire includes first column of enameled conducting wire and second column of enameled conducting wire. There are several pieces of enameled conducting wire in each column. Each piece of enameled conducting wire in first column through a bend and passes through second column of enameled conducting wire. Each piece of enameled conducting wire in second column through a bend and passes through first column of enameled conducting wire so as to realize transposition between first column of enameled conducting wire and second column of enameled conducting wire. In the invention, the transposed conducting wire is covered by fiberglass web. Thus, the conducting wires keep their structure and performance all the time to prevent hydrolysis.

The present invention provides a low-K dielectric composition for high frequency applications. The invention relates to a low-K, high-Q, low fired dielectric materials and a method of forming a fireddielectric material. The dielectric material can be fired at 950 DEG C or below or 1,100 DEG C or below, the K value is less than about 8 at 10GHz to 30GHz, and the Q value is greater than 500 or greater than 1,000 at 10GHz to 30GHz. Before firing, the dielectric material comprises a solid portion comprising a silica powder and a glass component. The glass component contains SiO2, B2O3, Al2O3, K2O, Na2O, Li2O and F; the total amount of Li2O + Na2O + K2O is from 0.1 mol% to 30 mol% of the glass component. The silica powder may be amorphous or crystalline.

The invention discloses a moistureproof insulation material for electrical engineering. The material comprises an inner layer and an outer layer. The inner layer is prepared from the following raw materials in parts by weight: 10-16 parts of quartz sand, 16-22 parts of aluminum oxide, 16-22 parts of polyallylamine resin, 3-9 parts of dimethylformamide, 1-4 parts of butyl rubber and 3-9 parts of nano silicon dioxide. The outer layer is prepared from the following raw materials in parts by weight: 15-22 parts of epoxy resin, 10-17 parts of polyamide resin, 20-28 parts of glass fiber, 2-6 parts of ethylene propylene diene monomer rubber, 0.5-1.2 parts of 2-mercaptobenzimidazole, 1-4 parts of nano zinc oxide, 10-18 parts of silicon nitride, 2-9 parts of hydrogenated nitrile-butadiene rubber, 5-11 parts of aluminum nitride and 5-11 parts of polyethylene. The moistureproof insulation material is composed of the inner layer and outer layer; the outer layer achieves the moistureproof effect under the combined actions of the components; and the material has steady insulating property under the combined actions of the components of the inner layer.

The invention discloses a glass fiber and carbon fiber composite core for a wire of a transmission line, which is characterized by consisting of 50 to 55 percent of carbon fibers, 10 to 15 percent of glass fibers and 30 to 40 percent of resin and auxiliary materials. Carbon fiber yarns pass through fibers-converging stander to be converged into a rounded body to be drawn outward; glass fibers cover the carbon fiber rounded body from a plurality of layers of creels and are drawn outward; and the carbon fiber rounded body covered by glass fiber yearns is synchronously drawn outward to pass through a mould. A well-stirred resin raw material can be poured into a resin storage tank 5 after being sieved by an 80 mesh sieve. The temperatures of a curing region and a forming region in the heating mould are set to be 200+/-10 DEG C and 140+/-10 DEG C respectively, and the heating mould is electrically heated. A heating system of an extruder is started, and the temperatures of heating areas are adjusted according to process requirements. The class fiber and carbon fiber composite core can well solve the problem of the combination of a thermosetting process and a thermoplastic process, thereby achieving excellent product quality and fulfilling a preset technical solution target.

The invention discloses a nano-enhanced rich resin mica tape with high thermal conductivity and applications thereof. The nano-enhanced rich resin mica tape with high thermal conductivity is formed by compounding a layer of mica paper, a layer of alkali-free glass cloth or two layers of alkali-free glass cloth, adhesive resin and inorganic nano powder, wherein the weight per unit area of each component is as follows: 70-140g/m<2> of mica paper, 15-70 g/m<2> of alkali-free glass cloth, 60-100 g/m<2> of adhesive resin and 1-15 g/m<2> of inorganic nano powder. The nano-enhanced rich resin mica tape with high thermal conductivity is applied to prepare main insulation of a high-voltage motor. With the adoption of the main insulation prepared by the nano-enhanced rich resin mica tape with high thermal conductivity, the heat conductivity coefficient is not lower than 0.35W.m-1.K-1, the bending strength is not lower than 120MPa at the temperature of 155 DEG C, and the electrical service life is not lower than 1200 hours under 10kV/mm electric field intensity, so that the nano-enhanced rich resin mica tape with high thermal conductivity and applications thereof are beneficial for lowering the temperature rising of a generator and the manufacturing cost of the whole generator, and improving the running reliability of the unit.

The invention discloses a dielectric slurry for aluminum alloy substrate thick-film circuits and a preparation process thereof. The slurry is composed of the following components: 60-75% of glass-ceramic powder and 25-40% of binder; wherein, Glass-ceramic powder is composed of SiO2, Bi2O3, B2O3, BaO, CaO, ZnO, Al2O3, V2O5, TiO2, Co2O3. The glass-ceramic powder prepared by using the above raw materials has a low melting temperature, so that the sintering temperature is lower than the melting temperature of the aluminum alloy substrate when the dielectric layer is prepared, and the substrate will not be damaged when the dielectric layer is prepared. In addition, the raw materials do not contain lead, which meets environmental protection requirements. . The thermal expansion coefficient of the obtained dielectric layer matches the aluminum alloy substrate, has good bonding performance, and can form a solid network structure, making the composite glass-ceramic insulating medium have excellent hardness and flexibility, which can meet the requirements of high-power aluminum alloy substrate thick film Special requirements when the circuit is in a harsh working environment. At the same time, the preparation process of the slurry is simple and easy to produce, and the obtained medium slurry has excellent performance.

PURPOSE: A dielectric material used for a plasma display panel is provided to easily remove bubbles from a dielectric layer during a burning process, obtain excellent chemical resistance of the dielectric layer and prevent a silver electrode from being browned. CONSTITUTION: A dielectric material used for a plasma display panel has glass powder that contains PbO of 25 to 55%, B2O3 of 10 to 40%, SiO2 of 1 to 15%, ZnO of 3 to 35%, BaO+CaO+MgO+SrO+Bi2O3 of 2 to 30%, Al2O3 of 0 to 10%, and TiO2+ZrO2 of 0.01 to 10%. The content of TiO2 is 0.01 to 10%. The content of BaO is 1 to 30%. The dielectric material further contains ceramic powder. In this case, the content of the glass powder is 90 to 100weight% and the content of the ceramic powder is 0 to 10weight%.