33results about How to "Excellent electrical insulation properties" patented technology

The invention discloses machinable aluminium oxide ceramics which is characterized in that the machinable aluminium oxide ceramics comprises the following components in percentage by mass: 60 percent to 68 percent of nano alumina, 30 percent to 36 percent of tabular alumina, 0.5 percent to 1.5 percent of magnesium oxide and 1 percent to 3 percent of titanium dioxide. A preparation method of the ceramics comprises the following steps of: preparing the nano alumina; after carrying out mixing and ball milling on the nano alumina, alumina, the magnesium oxide, titanium dioxide and absolute ethyl alcohol, drying the mixture, removing zirconium oxide grinding balls, and carrying out roasting, washing, filtering and drying on the obtained product to obtain composite powder; and after uniformly mixing the composite powder and a polyvinyl alcohol 1799 binder and pelleting the obtained mixture, carrying out dry-pressing forming to obtain a green body and placing the formed green body into a high temperature furnace to carry out sintering so as to obtain the ceramics. The bending strength of the ceramics reaches 526MPa. The fracture toughness of the ceramics reaches 6.4MPa.m1 / 2. The ceramicshave excellent machinable performance. The problems of complex structure and high cost and difficultly-controlled preparation process of the existing machinable ceramics are effectively solved.

The present invention provides a semiconductive glaze product which exhibits low thermal expansion coefficient without adversely affecting other glaze characteristics, and which, when applied to an insulator, attains enhanced mechanical strength of the insulator; a method for producing the semiconductive glaze product; and an insulator coated with the semiconductive glaze product. The semiconductive glaze product contains a glaze composition and a flux, the glaze composition containing a KNaO-MgO-CaO-Al2O3-SiO2-based base glaze in which the compositional proportions of basic components; i.e., KNaO, MgO, and CaO, as represented by the Seger formula, are 0.1 to 0.4, 0.2 to 0.6, and balance, respectively, and containing a metal oxide composition including tin oxide and antimony oxide, wherein the amount of the flux is 10 parts by weight or less on the basis of 100 parts by weight of the glaze composition.

A composition for fixing wound items comprising A) 0 to 90 wt% of at least one alpha, beta-unsaturated polyester and / or polyester imide resin based on at least one unsaturated mono-, di- or tricarboxylic acids and / or mono-, di- or tricarboxylic acid group containing molecules, at least one polyol and / or, in case of an unsaturated polyester imide, at least one imide having 5-membered cyclic imide moieties, B) 0.1 to 80 wt% of at least one inorganic and / or organic-inorganic hybrid component having functionalities to react with component A) and C), C) 2 to 80 wt% of at least one monomeric and / oroligomeric unsaturated component to react with component A) and B), and D) 0 to 15 wt% of customary additives, the wt% being based on the total weight of the composition. The composition provides excellent thermal transfer properties and a high level of electrical insulation properties with excellent adhesion and thermal stability.

The invention discloses a flexible high-thermal-conductivity polymer nanocomposite film. According to the invention, an h-BN thermal-conductivity filler is adopted and HDPE is used as a matrix. A preparation method for the flexible high-thermal-conductivity polymer nanocomposite film comprises the following steps: physically premixing the h-BN and the HDPE, carrying out melt blending with a twin-screw extruder to increase the dispersibility of the h-BN in the HDPE, extruding a formed h-BN-HDPE composite material through a single-screw extruder, carrying out cooling, stretching and flaking; andfinally, carrying out hot stretching treatment on the composite material to induce the orientation of the layered h-BN in the HDPE, wherein the content of the filler determines the flexibility and the heat-conducting property of the film, and the content of the filler depends on the dispersity of the filler in the polymer matrix. The polymer heat conduction nanocomposite film prepared by the invention has ultrahigh heat conductivity, good heat dissipation capability, good flexibility and excellent comprehensive performance, is applicable to mass production, can be made into various components, and has wide application prospects in the fields of electronic packaging, LED lighting systems, automobiles, aerospace and the like.

The invention provides a negative type photosensitive composition curable at a low temperature and capable of forming a cured film excellent in transparency, in chemical resistance and in environmental durability, and also to provide a pattern-formation method employing the composition. The present invention provides a negative type photosensitive composition comprising : an alkali-soluble resin,a compound having two or more (meth)acryloyloxy groups, a polysiloxane, a polymerization initiator, and a solvent. The alkali-soluble resin is a polymer comprising a carboxyl-containing polymerizationunit and an alkoxysilyl-containing polymerization unit.

The invention relates to an electronic part and a production method thereof, more particularly bonds a protective paper on an insulation paper, thus improves an electric insulation characteristic between electric pole foils, and protects two sides of a flat part of the wire. The protective paper has a minimum width, prevents a radial direction substantially thickening, and further prevents an Equivalent Series Resistance (ESR) of the electronic part from increasing. A protective paper (6; 6A, 6B) wider than a wire flat part is bonded on the insulation paper (5; 5A, 5B) for transmitting the protective paper to the insulation paper (5; 5A, 5B) to roll at a basic perpendicular direction to a direction of transmission of the insulation paper (5; 5A, 5B) and an electrode foil (4; 4P, 4M) right before the insulation paper region bonded by the protective papers is rolled.

The invention relates to a catalyst for the polymerization of norbornene monomers comprising transition metal complex (A) represented by formula (1); and a method for producing a norbornene (co)polymer, especially a norbornene copolymer containing a monomer unit represented by formulae (2) and (3), wherein a norbornen monomer is homopolyzed or copolymerized in the presence of the polymerization catalyst. Preferable examples of the transition metal complex (A) include (À-allyl){4-(2,6-diisopropylphenylimino)-2-penten-2-olato- º 2 N,O}palladium and (À-allyl){4-(1-naphthylimino)-2-penten-2-olato- º 2 N,O}palladium. In the formulae, the symbols are as defined in the description. A norbornene (co)polymer which has excellent transparency, excellent heat resistance, excellently low water absorption and excellent electrical insulation characteristics can be efficiently produced by the present invention.

The invention relates to a sensor assembly (1) which comprises a first acoustic transducer assembly (10) having at least one surface formed as a diaphragm (12), the diaphragm (12) being suitable to emit sound waves. An acoustic converter assembly (10) of this type is also designated a flexible resonator and can generate sound waves having a comparatively high acoustic pressure. The sensor assembly (1) according to the invention has a second acoustic transducer assembly (20), comprising a plurality of sensor elements (22a - 22i) which are arranged in an array. Provision is made for the second acoustic transducer assembly (20) to be arranged on a surface of the first acoustic transducer assembly (10) that is formed as a diaphragm (12). According to the invention, the second acoustic transducer assembly (20) comprises sensor elements (22a - 22i) which are formed as electret converter elements. A sensor assembly (1) of this type can be formed in particular as an ultrasound sensor assembly for detecting the surroundings of a vehicle.

The invention provides a negative type photosensitive siloxane composition, which is high in resolution, high in temperature resistance, and high in transparency. The negative type photosensitive siloxane composition can inhibit the heat collapse occurring in the heat consolidation without improving the molecular quantity of the high crosslinking agent or the siloxane composition. The negative type photosensitive siloxane composition comprises a (I) polysiloxane, aromatic imide compound released by light radiation and a solvent (III).

The invention discloses a thermoplastic material solid-sealed polar pole with voltage class of 35kV and above and a manufacturing method thereof. The solid-sealed polar pole comprises a vacuum arc-extinguishing chamber, the vacuum arc-extinguishing chamber comprises a ceramic insulator, the upper part of the ceramic insulator is provided with a stainless steel cover plate 1, and the lower part ofthe ceramic insulator is provided with a stainless steel cover plate 2; an upper outgoing line metal insert is arranged at the upper part of the stainless steel cover plate, a thermoplastic shell is arranged outside the vacuum arc-extinguishing chamber, and the vacuum arc-extinguishing chamber is characterized in that a protective layer 1 is arranged at the outer side of the joint of the stainlesssteel cover plate 1 and the ceramic insulator, so that the stainless steel cover plate 1 is isolated from the thermoplastic shell. The solid-sealed polar pole provided by the invention has a good electrical insulation characteristic, and the electrical safety margin of the whole product is effectively improved.

The invention relates to a tightness-adjustable composite material coupling member and a fabrication method and an assembly of the coupling member. The coupling member is formed by assembling of a cylindrical connecting bar of which two ends are prefabricated with male threads, two connecting plates and two U-shaped connecting plates. The coupling member is characterized in that the connecting plates consist of cylindrical connecting rods and rectangular plates, and the two cylindrical connecting rods are in threaded connection with two ends of the cylindrical connecting bar; arc-shaped bosses are prefabricated on the upper surfaces and the lower surfaces of the connecting plates, and arc-shaped grooves corresponding to the arc-shaped bosses are prefabricated on the internal opposite surfaces of the U-shaped connecting plates; and the connecting plates are buckled and fixed into the arc-shaped grooves in the internal opposite surfaces of the U-shaped connecting plates in a screw-in manner through the arc-shaped bosses on the connecting plates so as to form the coupling member. The fabrication method of the coupling member comprises the following steps: Forming the male threads at the two ends of the cylindrical connecting bar; forming the connecting plates and the U-shaped connecting plates with the vacuum diversion process; and after the assembly, rotating the cylindrical connecting bar so as to adjust the tightness of the connecting plates at the two ends. The tightness-adjustable composite material coupling member has the characteristics of simple structure, easiness for operation, light weight, corrosion resistance, electric insulation and the like, and can be free of maintenance and conveniently popularized and applied.

The invention discloses a method for preparing a storage of a vertical structure on the basis of a buried layer. According to the method, a bottom electrode is buried, a function material layer is stored, and accordingly good electric heating insulation is achieved, and the situation that a CMP is relied on when a component of a vertical structure is prepared in the prior art is eliminated. According to the method, under the assistance of high-precision linear photoetching means such as electron beam lithography and focused particle beam etching and high-precision thin-film deposition and etching processes, the defects that the development cycle is long, development is difficult, cost is high and adaptability is poor due to development bottlenecks of a CMP technique are solved in development of the vertical structure in the prior art, and the method has great advantages in preparation precision, preparation efficiency, economical performance, compatibility with an existing CMOS process and the like.

A battery module and its gluing equipment and process. The battery module includes a module body, and the external heat transfer surface of the module body is coated with a layer of high-elastic heat-conducting material. The gluing process includes two ways of controlling the solenoid valve and controlling the stepping motor. The way to control the solenoid valve is to control the extrusion speed of the glue by adjusting the opening of the valve; the way to control the stepping motor is to control the moving speed of the glue head. Control the glue extrusion speed; the glue application equipment includes a detection system, a glue system, a constant temperature system and a computer terminal; the glue system includes a glue extrusion device and a movement mechanism that controls the extrusion device; It is used to receive the signal from the computer terminal and adjust the opening of the valve; the movement mechanism is controlled by a stepper motor, and the stepper motor receives the signal from the computer terminal to control the moving speed of the movement mechanism. Achieve higher production efficiency and lower process cost than sticking thermal pads, and prevent air bubbles on the mating surface.

The invention relates to an electronic part and a production method thereof, more particularly bonds a protective paper on an insulation paper, thus improves an electric insulation characteristic between electric pole foils, and protects two sides of a flat part of the wire. The protective paper has a minimum width, prevents a radial direction substantially thickening, and further prevents an Equivalent Series Resistance (ESR) of the electronic part from increasing. A protective paper (6; 6A, 6B) wider than a wire flat part is bonded on the insulation paper (5; 5A, 5B) for transmitting the protective paper to the insulation paper (5; 5A, 5B) to roll at a basic perpendicular direction to a direction of transmission of the insulation paper (5; 5A, 5B) and an electrode foil (4; 4P, 4M) rightbefore the insulation paper region bonded by the protective papers is rolled.

The invention discloses a ternary system high-temperature piezoelectric ceramic of magnesium bismuth titanate, bismuth zinc-based perovskite and lead titanate and a preparation method thereof. The composition of the piezoelectric ceramic is expressed by a general formula (1-n) [uBi(Mg0.5Ti0.5)O3 + vBi(ZnxDy)O3 + (1-u-v) PbTiO3] + nM; and the preparation method comprises the steps of mixing, ball milling, pre-sintering, blank making, sintering, silver coating and polarization. The composition of the piezoelectric ceramic has perovskite structure and has similar phase interface of a rhombic ferroelectric phase and a foursquare ferroelectric phase, so the piezoelectric ceramic has excellent piezoelectric performance and high Curie temperature, is more suitable for high-temperature field, and has low dielectric loss; the electric polarization process is easier and more convenient; and the piezoelectric ceramic can be prepared by adopting a preparation technology of the traditional piezoelectric ceramic, particularly adopting cheap industrial raw materials, and has practicability.

[Problem] To provide a photosensitive siloxane composition which has high resolution, high heat resistance and high transparency, does not undergo thermal sagging, which may occur during thermal curing, without the need of increasing the molecular weight of a cross linking agent or a siloxane compound, and has properties including high sensitivity and a high film-remaining rate. [Solution] A negative-type photosensitive polysiloxane composition characterized by comprising: (I) (Ia) a polysiloxane having such a property that a prebaked film thereof is soluble in an aqueous 5-wt% tetramethylammonium hydroxide solution at a dissolution rate of 3,000 Å / sec. or less and (Ib) a polysiloxane mixture containing a polysiloxane and having such a property that the dissolution rate of a prebaked film thereof in an aqueous 2.38-wt% tetramethylammonium hydroxide solution is 150 Å / sec. or more; (II) a curing aid; and (III) a solvent.

The present application relates to an electromagnetic wave shielding film, and can provide an electromagnetic wave shielding film having excellent electromagnetic wave shielding ability and also having excellent mechanical strength, flexibility, electrical insulation, adhesiveness to other elements, stability against oxidation and high temperature, etc.

The invention discloses machinable aluminium oxide ceramics which is characterized in that the machinable aluminium oxide ceramics comprises the following components in percentage by mass: 60 percent to 68 percent of nano alumina, 30 percent to 36 percent of tabular alumina, 0.5 percent to 1.5 percent of magnesium oxide and 1 percent to 3 percent of titanium dioxide. A preparation method of the ceramics comprises the following steps of: preparing the nano alumina; after carrying out mixing and ball milling on the nano alumina, alumina, the magnesium oxide, titanium dioxide and absolute ethyl alcohol, drying the mixture, removing zirconium oxide grinding balls, and carrying out roasting, washing, filtering and drying on the obtained product to obtain composite powder; and after uniformly mixing the composite powder and a polyvinyl alcohol 1799 binder and pelleting the obtained mixture, carrying out dry-pressing forming to obtain a green body and placing the formed green body into a high temperature furnace to carry out sintering so as to obtain the ceramics. The bending strength of the ceramics reaches 526MPa. The fracture toughness of the ceramics reaches 6.4MPa.m1 / 2. The ceramicshave excellent machinable performance. The problems of complex structure and high cost and difficultly-controlled preparation process of the existing machinable ceramics are effectively solved.

The invention discloses a connection construction member capable of regulating tightness and a manufacturing and assembling method thereof. The connection construction member is assembled by a connecting rod, two connecting plates and two U-shaped connecting plates, wherein the connecting rod is made of glass fiber reinforced plastic composite material, and two ends of the connecting rod are provided with male threads. The manufacturing and assembling method for the connection construction member capable of regulating the tightness comprises the following steps of: 1) carrying out pultrusion on the connecting rod, and lathing a positive-buckling male thread and a reverse-buckling male thread on two ends of the connecting rod; 2) carrying out pultrusion on a pin, and lathing the male thread on two ends of the pin; 3) carrying out pultrusion on two pairs of nuts; 4) forming the connecting plates and the U-shaped connecting plates in a vacuum flow guide technology; 5) processing pin holes in the center positions where the connecting plates are opposite to the U-shaped connecting plates; and 6) fixedly connecting the connecting rod, the two connecting plates and the two U-shaped connecting plates into a connection construction member by the pin holes, the pin and the nuts. The manufacturing and assembling method is simple and easy to operate, has the characteristics of light weight, corrosion resistance and electric insulation, is adjustable, is safe to assemble, does not need to maintain and repair because the weather resistance lasts for 20 years, and is favorable for popularizing and applying.