57results about How to "Promote wetting and spreading" patented technology

The invention discloses a method for brazing or fusion-welding through lasers with ultrasonic waves as auxiliaries, which relates to a welding method. The invention solves problems during processes that the lasers are used to braze or fusion-weld coating metals which has low melting points or dissimilar metals, and the problems are that wetting spreading property is bad, filling amount is not enough, stomatas and solders aren't welded fully and the like. The method of the invention is that during the processes that the lasers are used to braze the coating metals which has the low melting points or the lasers are used to fusion-weld the dissimilar metals, simultaneously, the ultrasonic waves with high-frequency vibrations are applied in welding zones which will be coagulated. The invention has the advantages that the occurrences of air holes can be minimized or avoided, and welding cost can be lowered. Welding solders can flow fully due to the high-frequency vibrations, which is beneficial for the wetting spreads of the welding solders and penetrations of the welding solders to the bottom portion of the welding zones, weld pool width and welding filling amount can be increased, the occurrences of welding defects as non-welding fully, undercuts and the like can be avoided, weld formations can be improved, and weld strength can be increased.

A graphene auxiliary brazing method for a ceramic matrix composite material and a metal material elates to a brazing method for the ceramic matrix composite material and the metal material and solves the problem that a brazed connector obtained by brazing the ceramic matrix composite material and the metal material is poor in mechanical property. The brazing method comprises the steps of placing the ceramic matrix composite material into plasma reinforcing chemical vapor deposition equipment to carry out plasma surface treatment, adding CH4 gas to regulate flow, opening a radio frequency power supply, regulating the radio frequency to deposit for 10-30min, using Ar and H2 as protection gas, cooling to the room temperature, obtaining the ceramic matrix composite material with graphene growing on the surface, placing Ti brazing filler metal between faces to be connected, placing the Ti brazing filler metal into a vacuum brazing furnace to be brazed, and finally cooling to the room temperature to finish brazing. The shear strength of a connector formed by the ceramic matrix composite material and the metal material in the brazing method can reach to 35Mpa at the room temperature.

The invention relates to a compound heating soldering method of precise part resistance heat and supersonic vibration, comprising the following steps: preparing a welded workpiece; mounting and clamping the welded workpiece; implementing soldering; and obtaining a soldering joint. A supersonic oscillator applies pressure on the welded workpiece; under the combined action of resistance heat and high-frequency supersonic oscillator vibration in vertical direction, a brazing filler metal sheet is moltened and spreads a surface to be welded in a wetting mode; supersonic cavitation action removes air holes in the melting brazing filler metal as well as air holes on an interface between the brazing filler metal and the surface to be welded, and the soldering joint is formed. The compound heating soldering of resistance heat and supersonic vibration of the invention can obviously improve the wetting spreading effect of the resistance soldering joint brazing filler metal sheet, greatly reduces soldering joint air holes and improves the mechanical reliability of the soldering joint.

The invention discloses a glass sealing material for a thermal battery and a preparation method thereof. The invention is characterized in that the glass sealing material comprises the following components in percentage by mole : 60-80% of SiO2, 3-15% of BaO, 5-15% of Na2O, 4-15% of K2O, 0-6% of Al2O3, 0-6% of B2O3, 0-5% of Li2O, and 0-5% of La2O3. The glass sealing material disclosed by the invention basically comprises SiO2, Al2O3 and B2O3, is added with proper matching of alkali metal oxide (mixed alkali effect) so as to control a softening point and viscosity of glass, improve the flowability of the glass and improve the performance of glass powder by adding modified oxides such as La2O3 with certain content and auxiliary ingredients, so that the wetting property of the glass to a titanium battery cover is improved. In addition, the invention prepares the glass sealing material by reasonable manufacturing technologies such as smelting, clearing, pulverizing, granulating and the like, so that the leakage rate of a sealing cover of the thermal battery produced by the sealing material disclosed by the invention is less than 1.0 multiplied by 10-10Pa.m<3>/s, and the insulation resistance is improved by more than one times compared with that of the sealing cover produced by the prior art.

An electronic component manufacturing method including: a step of mounting a bump formation material on a first wiring substrate 100 to melt the bump formation material to form a bump 200 at the wiring substrate 100; a step of pressing a jig onto the bump 200 to form a recessed portion 220 having a front end portion 202; a step of printing a solder paste 420 onto an electrode 410 of a second wiring substrate 400; a step of performing, on the solder paste 420, positional alignment of the bump 200 on the wiring substrate 100 to allow the front end portion 202 to be in contact with the bump; and a step of heating the wiring substrate 400 on which the wiring substrate 100 is mounted, wherein the recessed portion 220 is formed from the bump front end portion 202 toward an outer periphery 230 in contact with the solder paste 420.

The invention discloses a flux-cored brazing rod with a protective film. The flux-cored brazing rod comprises a brazing rod body composed of a flux core and a solder alloy sheath wrapping the flux core; the solder alloy sheath comprises silver-based brazing filler metal, copper-based brazing filler metal, aluminum-based brazing filler metal or zinc-based brazing filler metal; the flux core is a brazing flux matched with the solder alloy sheath; the protective film which is 0.001-0.15 mm thick adheres to the outer surface of the brazing rod body in a sealing mode. The flux-cored brazing rod has the advantages that the protective film adheres to the outer surface of the seamed flux-cored brazing rod in the sealing mode, so the flux-cored brazing rod absorbs moisture from a seam, the storage cost is reduced, and energy is saved; surface oxidation of the seamed flux-cored brazing rod can be effectively prevented, and the quality of a brazing joint is improved; meanwhile, the brazing flux contained in the protective film can restore the oxidized solder alloy sheath, and wetting and spreading of the brazing filler metal are facilitated to a certain extent. A preparation method of the flux-cored brazing rod with the protective film is simple, the investment cost is low, and production efficiency is high.

An active coupling agent for contact reaction of graphite and stainless steel is prepared by taking 10-20% of Ti powder, 10-60% of CuLi10 powder, 10% of binder and the balance Cu powder, by mass, anduniformly stirring the powder to obtain the pasty active coupling agent. The brazing method comprises the steps: processing the surface to be welded of a stainless steel block into the corrugated surface, cleaning the surfaces to be welded of a graphite block and the stainless steel block, coating the surfaces with the active coupling agent, combining the graphite block and the stainless steel block into a butt joint sample, pre-coating the contact surface of a fixture and the sample with a brazing resist, fixing and compressing the sample on the fixture, placing the sample in a vacuum chamberof a brazing furnace, applying welding pressure to the sample, carrying out vacuumizing, then heating and insulating the butt joint sample, and cooling the butt joint sample to room temperature alongwith the furnace to complete brazing. By means of a contact reaction principle, the high-reliability, high-density, brazing filler metal-free and brazing flux-free coupling between the graphite and the stainless steel is realized, the brazing temperature of the graphite and the stainless steel can be reduced, and the mechanical property of a matrix material can be guaranteed.

The invention relates to brazing fluxes used for welding, in particular to a brazing flux used for melt-brazing of aluminum alloy/stainless steel. The brazing flux is characterized in that the brazing flux is prepared by mixing and grinding powder of potassium tetrafluoroaluminate+potassium hexafluoroaluminate (KAlF4+K3AlF6) eutectic, potassium fluorosilicate, potassium fluoroborate, aluminum, zinc, tin and copper; the brazing flux comprises, by weight, 40%-60% of potassium tetrafluoroaluminate+potassium hexafluoroaluminate (KAlF4+K3AlF6) eutectic, 0-10% of potassium fluorosilicate (K2SiF6), 0-10% of potassium fluoroborate (KBF4), 10%-30% of aluminum (Al), 0-10% of zinc (Zn), 0-10% of tin (Sn), and 0-10% of copper (Cu); the sum of the weight percents of all the raw materials is 100%. According to the brazing flux, the good wetting spreading property of an existing brazing flux is maintained, and meanwhile, the texture of a connector is improved, and forming of brittle intermetallic compounds is reduced, so that the mechanical property of the connector of melt-brazing is improved, and finally dissimilar metal of the aluminum alloy and the stainless steel is connected reliably with high quality. The brazing flux further has the advantages that the melt-brazing process is relatively simple; the energy consumption and the cost of the raw materials are low; the residual quantity of the brazing flux is small after welding; and residues are easy to clean up.

The invention discloses water-based two-component bright white finish preventing rash and a preparation process thereof, and relates to the technical field of chemical coating, overcoming a problem that overall application effects are poor because rash and pinholes are liable to generate during construction of water-based two-component paint. The white finish includes a main agent and a curing agent which are separately stored and which are mixed according to a mass ratio of (5-8):1 when in use, and is characterized in that the main agent includes, by weight, 50-60% of water-based hydroxy acrylic resin, 0.1-0.3% of a pH conditioner, 0.5-1% of a polymer defoamer, 5-10% of a film forming aid, 0.1-0.2% of an organosilicon defoamer, 0.05-0.15% of a wetting and leveling agent, 6-10% of deionized water, 0.1-0.3% of an associated type thickener, 20-30% of water-based white paste, 2.75-3.25% of wax emulsion, and 0.1-0.3% of a dispersant; and the curing agent includes, by weight, 65-75% of isophorone diisocyanate and 25-35% of hexamethylene diisocyanate. After construction of the white finish, rash and pinholes are not liable to generate and the overall application effect is good.

The invention discloses a high frequency-electric arc composite welding method. According to the method, two welding methods of electric arc welding and high frequency welding are composited; a high frequency current is fed into a workpiece while electric arc welding is performed; by means of a strong skin effect and a proximity effect of the high frequency current, high frequency resistant heat is made to be generated in a molten pool and in the side wall of a weld joint at the front edge of the molten pool; and part of the welding energy is directly fed to the to-be-welded face of base metal, the limitation that the fusion depth is small and the welding speed is low because of a heat conduction mechanism of traditional electric arc welding can be broken through, and the fusion depth of welding and the welding efficiency are substantially improved. Meanwhile, a high frequency alternating magnetic field generated by the high frequency current has a certain stirring agitation effect onmetal of the molten pool, and the weld joint structure and weld joint forming can be improved easily. Besides, the method can also be used for melt-brazing and brazing of dissimilar metal; in the welding process that brazing flux is used, the method can effectively improve the film removing effect of the brazing flux, moistening and laying of solder metal on the surface of the base metal, especially on the back side of the base metal, are greatly promoted, and weld joint forming is improved.

The invention discloses a method for improving the wettability of brazing filler metal based on surface modification of a carbon-carbon composite. Carbon nanotubes grow in situ in a hole formed afteroxidation pretreatment of the carbon-carbon composite and are used as a bridge to promote liquid brazing filler metal to be wetted and spread in a brazing process and improve the capacity of filling the hole. The carbon nanotubes grow on the surface of the carbon-carbon composite by selecting a chemical vapor deposition method, and the carbon-carbon composite is brazed or brazed together with metal by selecting the brazing filler metal capable of wetting the carbon-carbon composite after the carbon-carbon composite is subjected to surface modification. By using the method, the surface of the carbon-carbon composite which is not brazed is subjected to high-temperature oxidation, and CNTs grow on the surface of the carbon-carbon composite which is not brazed, an infiltration interface structure is formed between a brazinrg seam and the carbon-carbon composite, and the spreading and filling capacity of the liquid brazing filler metal is improved, so that the reaction of the brazing fillermetal and the carbon-carbon composite is more sufficient, and the method has important significance in reducing residual stresses in joints and improving the connection performance of the joints.

The invention discloses a preparation method of a graphene modified silicon-titanium nano heavy anti-corrosion material. The graphene modified silicon-titanium nano heavy anti-corrosion material is characterized in that graphene modified silicon-titanium nano polymer slurry is composed of graphene dispersion liquid, titanium nano dispersion liquid, silanol resin, nano cerium oxide, a surfactant, adispersing agent and heptadecafluorodecyltriethoxysilane. According to the composition and the preparation process of the graphene modified silicon-titanium nano heavy anti-corrosion material, solvent-free or solvent-type epoxy resin, graphene modified silicon-titanium nano polymer slurry, special macromolecular resin, a dispersing agent, an antifoaming agent, a leveling agent, a coupling agent,a thickener, a reactive diluent, pigments, fillers and the like are mixed and sanded until the particle size is less than 30 microns to obtain a component A of a coating, and modified phenolic aldehyde amine, fatty amine, phenolic resin, polyamide and the like are selected as curing agents, a heavy anti-corrosion coating film is formed through normal-temperature or high-temperature baking, and theformed coating is a long-acting heavy anti-corrosion material which is resistant to high temperature, strong acid, alkali and salt solution corrosion and resistant to abrasion.

The invention relates to a soldering flux for aluminum and steel dissimilar metal alternating-current arc melt brazing and a manufacturing method thereof. The method comprises the steps of first enabling KAlF4 powder and aluminum powder to be mixed at a mass ratio of (4-7):(3-6), then enabling the mixture to be mixed with acetone into uniform suspension solution, enabling potassium sodium tartrate which is 0.5%-1% the total mass of the KAlF4 powder and the aluminum powder to be added into distilled water to be dissolved, finally adding the suspension solution into the distilled water to mix evenly, and obtaining the soldering flux. The soldering flux has effects of stabilizing alternating-current arc, promoting wetting spreading, improving welded joint formation and improving joint performance, and high-quality reliable connection of aluminum and steel dissimilar metals is achieved finally.

The invention relates to the technical field of welding, and discloses a multi-size surface microstructure composite regulation aluminum stainless steel laser connection method. The welding method comprises the following steps of (1) pretreating an aluminum/stainless steel surface, specifically, pretreatment comprises the following steps that a stainless steel plate to be welded and an aluminum plate to be welded are subjected to pre-welding cleaning; laser etching is conducted on the surface of the cleaned stainless steel plate, and the stainless steel plate with a surface microstructure is prepared; and chemical etching is performed on the stainless steel plate subjected to laser etching to prepare the stainless steel plate with the composite microstructure; and (2) placing and assembling the stainless steel with the composite microstructure and the cleaned aluminum plate in a lap joint manner, coating the surface of the stainless steel with brazing flux, adjusting a laser device to proper technological parameters, and carrying out welding. By means of the multi-size surface microstructure composite regulation aluminum stainless steel laser connection method, the problems of brittle compounds and thermal stress cracking generated in the aluminum/stainless steel welding process in the prior art are solved, and the strength of a connector is improved.

The invention discloses a low-temperature lead-free alloy flux and a preparation method thereof. The low-temperature lead-free alloy flux comprises the following raw materials in parts by weight: 18-24% of In, 2-5% of Bi, 0.1-0.4% of Sb, 0.1-0.7% of Cu, 0.02-0.06% of Ce and the balance of Sn. The melting point of the low-temperature lead-free flux is within 163-194 DEG C; the alloy flux is uniformand fine in metallographic structure, excellent in wetting spreadability, firm in bonding with a substrate welding disc and welded parts, bright and full in welding spot and excellent in mechanical performance and electric performance; and the low-temperature lead-free alloy flux preferably meets the process requirements of using the low-temperature lead-free alloy flux in the lead-free process of the electronic industry, and meets relevant regulations of energy conservation, emission reduction and environmental protection.