32results about How to "Large coefficient of linear expansion" patented technology

The invention discloses a graphene double-layer electroactive membrane and a preparation method thereof. The graphene double-layer electroactive membrane is composed of a flexible conducting layer anda flexible polymer layer. The preparation method comprises mixing and reacting flake graphite powder, NaNO3, sulfuric acid, KMnO4 and deionized water, and performing washing and drying processes to obtain graphene oxide; mixing and ultrasonic-dispersing the graphene oxide, hydrazine hydrate, ammonium hydroxide and deionized water for reaction to obtain reduced graphene oxide dispersion liquid; dropwise or rotatingly applying the reduced graphene oxide dispersion liquid onto a flexible polymer layer-polymer membrane and performing a drying process to form the flexible conducting layer onto thepolymer membrane to obtain the graphene double-layer electroactive membrane. The graphene double-layer electroactive membrane has the advantages of high responsiveness, low power, broad pressure range and the like when being electrically driven, and can be applied to the fields of flexible wearable equipment, micro motor actuators and micro-robots.

The invention discloses a processing method of an aramid fiber reinforced polytetrafluoroethylene holder. The aramid fiber reinforced polytetrafluoroethylene holder (1) comprises two lateral end faces (1.1), a pocket (1.2), an outer-diameter end face (1.3) and an inner-diameter end face (1.4); stable treatment I, semi-finish turning on the outer-diameter end face, semi-finish turning on the inner-diameter end face and stable treatment II are added on the basis of the conventional processing; a bakelite expander (2) is used in the semi-finish turning on the outer-diameter end face and semi-finish turning on the inner-diameter end face; the bakelite expander comprises a lathe clamping section (2.2) and a holder fixing section (2.3); and the whole processes of rough turning on the inner-diameter end face, rough turning on the outer-diameter end face, stable treatment I, turning on the two lateral end faces, semi-finish turning on the outer-diameter end face, semi-finish turning on the inner-diameter end face, distributing and drilling pocket, stable treatment II, finish turning on the inner-diameter end face, finish turning on the outer-diameter end face, and final detection are finally formed. The demands on the processing environment temperature are provided, so that the manufacturing percent of pass of the aramid fiber reinforced polytetrafluoroethylene holder is improved to 80% from below 20% in the prior art.

The invention provides environment-friendly high-temperature-resistant paint, which is prepared from the following ingredients in parts by weight: 10 to 15 parts of silica sol, 15 to 20 parts of aluminium dihydrogen phosphate, 5 to 10 parts of glass powder, 5 to 10 parts of talcum powder, 10 to 15 parts of kaolin powder, 10 to 15 parts of aedelforsite powder, 1 to 5 parts of bis(cyclopentadienyl) ethoxyethyl acrylate and 20 to 30 parts of water. The invention also provides a preparation method of the environment-friendly high-temperature-resistant paint. All ingredients in the environment-friendly high-temperature-resistant paint are mutually matched; the advantages are complementary, so that on the premise of maintaining good attachment force of the paint, the paint has the excellent characteristics of corrosion resistance, high-temperature resistance, crack resistance, corrosion resistance, cold and heat exchange resistance, storage stability and the like.

The invention relates to the field of magnetic suspension air blowers, in particular to a magnetic suspension blower with an adjustable blade tip clearance and a debugging method. The blower comprises a machine shell, a motor shaft, a magnetic bearing device, a plurality of radial and axial sensors, an impeller, an axial adjusting block and a volute; the axial adjusting block is fixed to the machine shell, and the volute is fixed to the axial adjusting block; the volute is provided with an air blowing channel, and the impeller is located in the air blowing channel; the axial adjusting block is made of an aluminum alloy material and is provided with a cooling water channel and a resistance wire; the water inlet end and the water outlet end of the cooling water channel are used for being communicated with a water inlet device and a water outlet device correspondingly, and the resistance wire is used for heating the axial adjusting block; and the air inlet end and the air outlet end of the air blowing channel are provided with a differential pressure flowmeter and a pressure gauge respectively, and the differential pressure flowmeter and the pressure gauge are used for detecting the air flow of the air inlet end of the air blowing channel and the air pressure of the air outlet end of the air blowing channel respectively. The blower can dynamically adjust the blade top gap, and the blowing quality of the magnetic suspension blower is improved.

The invention provides an anti-radiation anti-corrosion coating which comprises the following raw materials in parts by weight: 10-15 parts of zirconium sol, 6-10 parts of aluminum dihydrogen phosphate, 8-12 parts of expanded graphite, 5-10 parts of carbon nanotubes, 1-5 parts of titanium dioxide, 5-10 parts of glass powder, 5-10 parts of talcum powder, 10-15 parts of kaolin powder, 10-15 parts of wollastonite powder, 0.5-3 parts of hydroxypropyl methyl cellulose, 1-5 parts of crylic acid bicyclo-pentenyl yloxyethyl ester and 20-30 parts of water. The invention further provides a preparation method of the anti-radiation anti-corrosion coating. Components of the anti-radiation anti-corrosion coating provided by the invention work together and complement advantages of one another, so that on the premise that the good adhesion property is maintained, the coating has the characteristics of excellent corrosion resistance, radiation resistance, bacterium prevention, flame retardancy, high temperature resistance, cracking prevention, corrosion resistance, cold and heat alternation denaturation, storage stability and the like.

The invention belongs to the field of bearing renovation, and relates to a copper alloy sliding bearing repairing technology. The copper alloy sliding bearing repairing technology is suitable for repairing of various kinds of copper alloy sliding bearings. The copper alloy sliding bearing repairing technology comprises the following steps that (1) a surface defect is inspected, and the damaged position of the copper alloy sliding bearing is determined and marked; (2) a gas etching part is ground; (3) welding repairing is carried out; and (4) finish machining is carried out. Aiming at the copper alloy sliding bearing renovation, a welding technology method of precise impulse welding is provided, by grinding the gas etching part, the welding technology method of precise impulse welding is adopted, and the bearing is machined to an original size, so that the using performance of the bearing is recovered.

The invention provides a radiation-resistant novolac epoxy resin paint, comprising the following raw materials in parts by weight: 20-30 parts of novolac epoxy resin, 15-20 parts of expanded graphite, 10-15 parts of perlite, 5-10 parts of glass powder, 5-10 parts of French chalk, 10-15 parts of kaolin powder, 10-15 parts of wollastonite in powder, 1-5 parts of acrylic acid dicyclopentadiene-oxygen-ethyl ester and 20-30 parts of water. The invention also provides a preparation method of the radiation-resistant novolac epoxy resin paint. The radiation-resistant novolac epoxy resin paint provided by the invention has the advantages of interaction and complementation of advantages of the components, so that the paint has the characteristics of good adhesive force as well as excellent corrosion resistance, high temperature resistance, cracking resistance, cold and hot alternation resistance, stability in storage and the like.

The invention relates to a welding method for 12Cr1MoV and 07Cr19Ni 11Ti dissimilar steel. In the prior art, austenite and pearlitic steel are mostly welded by adopting constantan welding wires, so that the cost is higher, weld joints are deformed and cracked, and welding in the prior art is not suitable for batch production. The dissimilar steel comprises dissimilar steel A (1) and dissimilar steel B (2), the butt gap b of the dissimilar steel A and the dissimilar steel B is 2.0 mm-3.0 mm, the groove angle a is 30 degrees-35 degrees, the truncated edge p is 1.5 mm-2.0 mm, the thickness delta of a pipe is 5 mm, a TGS-347 welding wire is adopted, the diameter of the welding wire is 2.4 mm, assembling is conducted in a free state during welding, manual tungsten electrode argon arc welding is adopted, an internal wire adding welding method is adopted during bottoming, after the pipeline is filled with argon and is stable, root layer welding is conducted, and the temperature between layers is controlled to be smaller than or equal to 350 DEG C; and the method comprises the steps that firstly, grooves in the base metal sides of the dissimilar steel A and the dissimilar steel B are machined, the surfaces of the grooves and the outer walls, within 10 mm, of the two sides of the base metal are cleaned, and then horizontal fixed welding and vertical fixed welding are conducted. The welding method is used for the dissimilar steel of pearlite steel and austenitic stainless steel.

A majority of materials in the natural world have positive thermal expansion properties, namely, within the certain temperature range, with increasing of the temperature, the materials are expanded in one direction or multiple directions. In actual engineering application, the great influence on the stability, accuracy, the service life and the like of engineering components is achieved. A negative thermal expansion material is a good expansive retarder which can be used for reconciling positive thermal expansion, improving the accuracy of the engineering components, prolonging the service life of the engineering components and the like. The invention provides a solid metal alloy material with the negative thermal expansion property and a preparation method thereof, the solid metal alloy material can serve as an expansive retarder material for using, the alloy material has the negative thermal expansion property within the certain temperature interval, and the general chemical formula of the alloy material is MnNi(1-x)FexGe/Cu or Mn(1-y)FeyNiGe/Cu (0<=x<=1, and 0<=y<=1), for example, the MnNi0.90Fe0.10Ge/35wt% Cu alloy material has the negative thermal expansion property under the condition of 176K<T<247K, and the thermal expansion coefficient of the alloy material is -56.7357*10<-6>K<-1>.

The invention provides a water-soluble high-temperature-resistant coating. The water-soluble high-temperature-resistant coating comprises, by weight, 8-12 parts of aluminum sol, 15-20 parts of aluminum dihydrogen phosphate, 8-14 parts of ground glass, 5-10 parts of talcum powder, 10-15 parts of kaolin powder, 10-15 parts of wollastonite powder, 1-5 parts of dicyclopenteneoxyethyl acrylate and 20-30 parts of water. The invention also discloses a preparation method of the water-soluble high-temperature-resistant coating. With all components in the water-soluble high-temperature-resistant coating matched mutually and complementing mutual advantages, the water-soluble high-temperature-resistant coating has the advantages of excellent corrosion prevention performance, resistance to high temperature and cracking, thermal shock resistance, good storage stability and the like on the premise of keeping good adhesive force.