38results about How to "Same expansion coefficient" patented technology

The invention discloses an insulating and decorating integrated composite precast concrete component and a manufacturing method thereof. The precast concrete component comprises decorative wall face bricks and a precast portion, wherein the decorative wall face brick and the precast portion are integrally solidified through a bonding mortar layer, and the precast portion is of a non-layered composite structure which is sequentially formed by solidifying a crack-resistant face layer, an insulating layer and a concrete layer. The concrete layer comprises filling concrete, a framework and an embedded part, wherein the framework extends into the insulating layer. The precast component is good in insulation, good in consistency, free of layering and easy to install. The manufacturing method comprises the steps of assembling and processing a mould, previously processing and laying the wall face bricks, sequentially pouring the crack-resistant face layer, the insulating layer and the concrete layer, and finally processing the surface of the whole component. The manufacturing method is simple in process. The manufactured precast component is high in quality, high in weather resistance and not prone to layering.

The invention relates to a component of a vehicle air compressor, in particular to an aluminum cylinder body of a vehicle air compressor. The aluminum cylinder body is characterized in that an inner hole surface of the aluminum cylinder is provided with a compound millimicron material coating with the ingredient being Ni and SiC of 40 to 60 nm granularity. Therefore, the aluminum cylinder body has the advantages of gas blowby resistance and oil pumping resistance of the compressor, abrasion resistance, corrosion resistance, good high-temperature oxidation resistance and long service life.

The invention discloses no-cracking Ru porcelain tableware and a no-cracking manufacture method of the Ru porcelain tableware. The porcelain comprises: a blank body and glaze materials which are usedfor manufacturing tableware; the blank body raw materials comprise Tanggou soil, Banpo soil and Heimao soil; the glaze raw materials comprise mica, horseshoe stones, agate stones, plant ash and sheepbone meal; the blank body raw materials and the glaze raw materials are crushed, water is added, wet grinding is carried out, and water is discharged after precipitation; slurry of the blank body rawmaterial is injected into a mold, and firing is carried out for forming a biscuit; glazing is carried out on the outer surface of the blank body raw material biscuit; and the blank body is placed intoa kiln, the furnace temperature of the kiln is raised to 1050 DEG C, heating is carried out at a speed of 1 DEG C every two minutes, when temperature is increased to 1280-1300 DEG C, heat preservation and firing are carried out on the blank body under a condition of 1280-1300 DEG C, and then firing is finished. Through the mode, according to the porcelain provided by the invention, the formula ofthe porcelain and the manufacturing method are improved, the expansion coefficients of the glaze materials and the biscuit are consistent, so that the phenomenon that existing Ru porcelain is crackedand the glaze surface of the surface is cracked is changed, no cracks and no fracture exist on the porcelain, and the manufactured porcelain can be made into high-grade tableware.

The invention relates to a high-density underwater epoxy repair adhesive and a preparation method and application thereof. The high-density underwater epoxy repair adhesive comprises a component A anda component B, wherein the component A comprises, in parts by mass, 50-100 parts of bisphenol A-type epoxy resin, 0-50 parts of low-viscosity amino-phenolic tri-functional group epoxy resin, 0-15 parts of a reactive diluent, 0-10 parts of a thixotropic agent and 20-60 parts of active silicon micropowder, and the component B includes, in parts by mass, 30-60 parts of Mannich modified phenolic amine, 20-50 parts of modified alicyclic amine and 0-600 parts of steel slag powder. The high-density underwater epoxy repair adhesive is applied to repairing of underwater buildings, and has the advantages of environmental protection, fast solidification, high density and high bonding strength.

The invention relates to a machining process for an alloy strip, in particular to a cold-rolling production method for a controlled expansion alloy strip. The cold-rolling production method is characterized by comprising the steps that a refined hot-rolled coiled plate is selected; the refined hot-rolled coiled plate is subjected to primary rolling, washing and annealing; then the refined hot-rolled coiled plate is subjected to secondary rolling, washing and annealing; and then the refined hot-rolled coiled plate is subjected to pull straightening, high-temperature aging treatment and reverse pull straightening to obtain the controlled expansion alloy strip. By adoption of the method for producing the controlled expansion alloy strip, no welding is needed, no welding seam exists in the strip, and the controlled expansion alloy strip is large in coiling diameter and good in uniformity and is 9.3*10<-6> DEG C / m in linear expansion coefficient at 20-400 DEG C.

The invention relates to a dual-band multi-polarization common-aperture waveguide slot antenna. Including L-band vertically polarized antennas, C-band vertically polarized antennas and C-band horizontally polarized antennas with equal lengths; and all of them are waveguide slot antennas; C-band vertically polarized antennas and C-band horizontally polarized antennas form a C-band dipole The polarized antenna array is located at the upper part, and the L-band vertically polarized antenna is located at the lower part; the L-band vertically polarized antenna, the C-band vertically polarized antenna and the C-band horizontally polarized antenna are all fed through the center of the antenna waveguide through a coaxial connector. Electrically, the coaxial connector and the waveguide form a 3dB power divider; realize the excitation of the L-band vertically polarized antenna, the C-band vertically polarized antenna and the C-band horizontally polarized antenna. The invention realizes sharing of multiple waveguide slot antennas on the same physical aperture area. Compared with the dual-band multi-polarization microstrip common-aperture antenna, the antenna has high efficiency, high polarization isolation, low cross polarization, and low power capacity. Great advantages.

The invention discloses a connection structure between glass and Kovar, which comprises a high boron glass tube of a solar heat collecting tube and a Kovar alloy tube, the Kovar alloy tube is inserted into the high boron glass tube of a solar heat collecting tube, and the outer side of the Kovar alloy tube is A micron kovar solder paste layer is provided at the joint, and a copper-plated layer is provided on the inner side of the high boron glass tube of the solar heat collector tube, and the micron kovar solder paste layer is connected to the copper-plated layer; the micron kovar solder paste layer It includes Fe-Co-Ni alloy particles, binder and 90-95% alcohol. The mass fraction of each component of the micron kovar solder paste layer is: 60-70 wt% of Fe-Co-Ni alloy particles, 20-30 wt% of binder, 5-10 wt% of 90-95% alcohol. The above-mentioned technical solution of the present invention has the following beneficial effects: the inventive method of using low-temperature sintering uses micron Kovar solder paste as an intermediate material to realize glass-Kovar sealing, which is reliable at high temperature, has no residual stress, and has good mechanical properties.

The invention discloses a glass and kovar connecting structure. The glass and kovar connecting structure comprises a high-boron solar heat collecting glass tube and a kovar alloy tube, wherein the kovar alloy tube is inserted into the high-boron solar heat collecting glass tube, a micron kovar soldering paste layer is arranged at the joint on the outer side of the kovar alloy tube, a copper plating layer is arranged at the joint on the inner side of the high-boron solar heat collecting glass tube, and the micron kovar soldering paste layer is connected with the copper plating layer and prepared from components in percentage by mass as follows: 60wt%-70wt% of Fe-Co-Ni alloy particles, 20wt%-30wt% of an adhesive and 5wt%-10wt% of 90%-95% ethanol. The technical scheme has beneficial effects as follows: with the creative application of a low-temperature sintering method, micron kovar soldering paste is taken as an intermediate material, glass-kovar sealing connection is realized, and the structure is reliable at high temperature, free of residual stress and good in mechanical property.

The invention relates to an efficient silicon carbide corundum rare earth ceramic composite grinding wheel which comprises the following raw materials in percentage by weight: 30-75wt percent of silicon carbide abrasive, 25-70wt percent of corundum abrasive, 12-22wt percent of rare earth ceramic and 3.5-8wt percent of normal-temperature binding agent. The composite grinding wheel is manufactured by the steps of calcining, ball-milling, blending, moulding, drying, sintering, and the like. The grinding wheel of the invention has the advantages of high grinding force for grinding a difficult grinding material, sharp grains, high self sharpening, shedding in time of blunt grinding grains and no burning on workpieces. Compared with the traditional single grinding material common ceramic binding agent grinding wheel, the efficient silicon carbide corundum rare earth ceramic composite grinding wheel obviously improves the grinding efficiency; and compared with a grinding wheel adopting an expensive superhard grinding material (artificial diamond or CBN (Cubic Boron Nitride)), the efficient silicon carbide corundum rare earth ceramic composite grinding wheel obviously reduces the grindingcost and has wider adaptation and favorable economic and social benefits.

The invention discloses a copper-nickel-silver brazing paste and a preparation method thereof. The invention adopts copper-nickel-silver with more stable alloy properties as the main base material, and prepares a copper-nickel-silver brazing paste through the cooperation of brazing flux. Soldering paste, which can meet the needs of brazing heat dissipation materials and external parts based on copper, silver, nickel and other base materials. The copper-nickel-silver brazing paste obtained in the present invention has high brazing joint strength after welding , The thermal conductivity and expansion coefficient are consistent with the heat dissipation substrate, which can effectively avoid poor product performance caused by differences in expansion coefficient.

The invention discloses a combined air supply nozzle, a rotary kiln and a preparation method thereof, which are mainly designed to improve the defects of the existing air supply nozzle such as short service life and inconvenient installation and replacement. The combined air supply nozzle of the present invention is composed of a nozzle cover and a nozzle core; wherein, the nozzle cover is a tubular structure, and the inner cavity of the tubular structure is adapted to the outer dimension of the nozzle core; the nozzle core is placed At least one through hole penetrating through the two ends of the nozzle core is provided in the nozzle sleeve and in its core. The nozzle core and nozzle cover of the present invention are pre-extruded and then fired at high temperature, which are relatively easy to install and replace, and their strength and practical performance are not limited by the kiln curve. In addition, outside air is ejected through multiple through holes in the nozzle core, which not only can better mix the air with the combustible gas in the kiln, but also can evenly burn the kiln temperature and reduce the temperature difference between the flame and the material.

The invention relates to the technical field of ceramics, in particular relates to Ru porcelain clay and a preparation method thereof, and also relates to Ru porcelain calcined with the Ru porcelain clay and a preparation method thereof. The Ru porcelain clay consists of 23 to 33 parts of Fengxue soil, 17 to 27 parts of Banpo soil, 10 to 25 parts of Tanggou soil, 8 to 20 parts of black soil, 5 to15 parts of quartz, 1 to 8 parts of sandstone, 0.5 to 2 parts of feldspar and 0.5 to 2 parts of alkaline ore. The Ru porcelain calcined with the Ru porcelain clay has excellent quality, compact porcelain body, high hardness and strong surface appearance, and when the Ru porcelain used as tableware and tea ware, remaining tea stains and oil stains are easy to clean, and practicability is enhanced.

The invention provides an arrangement structure for the lower header of the boiler cladding wall, which can eliminate the welding stress and expansion stress between the sealing steel plate and the pipe, solve the problem that the sealing steel plate tears the pipe wall due to the change of stress, and ensure Ensure the normal use of the boiler wall tube, and then ensure the normal use of the boiler. It includes the lower header of the front wall, the lower header of the side wall, the elbow of the side wall, and the sealing steel plate. The sealing steel plate is welded to the lower header of the front wall, the lower header of the side wall, and the elbow of the side wall. The isolation structure is characterized in that: the lower header of the front wall is located above the level of the lower header of the side wall, the bend of the side wall is one, and the horizontal distance of the bend of the side wall is reduced to the original Half of the sealed steel plate is specifically a carbon steel sealed steel plate.

The invention relates to a preparation method of a homogenic inorganic membrane tube, belongs to the technical field of inorganic membranes and relates to a preparation method of inorganic membrane tubes and membrane tubes thereof. The method comprises the following steps of: 1) screening homogenic base materials with uniform or same particles in size; 2) uniformly mixing base materials with water and water glass to form an inorganic membrane tube raw material; 3) filling the inorganic membrane tube raw material to a centrifugal casting inorganic membrane tube machine and manufacturing a membrane forming tube by centrifugal force; and 4) demoulding, sintering and cooling to form. The homogenic inorganic membrane tube provided by the invention is simple to manufacture and free from drying and demoulding, so that the production efficiency is greatly improved and the production cost is lowered. The inorganic membrane tube products prepared by the invention are consistent in filter layers, and the filter precision of the tube products washed and damaged is still maintained consistent.

The invention provides an internally-arranged cremator heat exchanger. The internally-arranged cremator heat exchanger comprises an air inflow pipe, heat exchange units, inner spray pipes and hot air spray pipes. The internally-arranged cremator heat exchanger is technically characterized in that the air inflow pipe is connected with a preheating pipe, the preheating pipe is arranged on the upper side of a vault of a hearth, the heat exchange units communicated with the preheating pipe through the inner spray pipes are arranged in the portions, on the two sides of the hearth, of a furnace body, the heat exchange units are hollow refractory prefabricated parts, the hot air spray pipes communicated with the hearth are arranged on the upper portions of the heat exchange units, and air outlets of the hot air spray pipes correspond to the middle of a bogie. The heat exchange units are the hollow refractory prefabricated parts, are directly laid inside the furnace body, and make direct contact with flames in the furnace body, and therefore the heat exchange temperature is high. Compared with a metal heat exchanger, the internally-arranged cremator heat exchanger is long in service life and free of oxidation corrosion, the expansion coefficient is consistent with that of the furnace body, and no damage is caused to the furnace body. Preheated air is further heated through the heat exchange units, the hot air temperature is higher, the incineration effect in the hearth is further improved, and fuel is effectively saved.

The invention provides a method for plating gold on the surface of a titanium alloy. The method comprises the following steps that S1, a titanium alloy matrix is pretreated; s2, preparing a transition nickel layer; and S3, preparing an electrogilding layer. According to the method for plating gold on the surface of the titanium alloy, the acid etching procedure is added in the front oil removal process of the titanium alloy, then the surface roughness of the titanium alloy base material is increased through hydrochloric acid activating treatment, and then the surface of the titanium alloy base material is coated with the nickel intermediate transition layer and the surface gold layer; and hydrogen removal treatment and low-temperature heat treatment are continued after plating, so that a solid solution is formed between the plating layer and the substrate. Due to the fact that the thermal expansion coefficients of the plating layer and the base body are different, the gap between the plating layer and the base body is large, nickel ions and gold ions in the plating layer migrate in the heat treatment process, a thick diffusion layer can be formed between the plating layer and the base body, the expansion coefficients of the plating layer and the base body tend to be consistent, and finally the gap between the plating layer and the base body becomes small at high temperature. And a metal bond is formed between the coating and the substrate, so that the coating binding force is improved.