52results about How to "Good brazing process" patented technology

The invention discloses a solder for soldering a different-component W-Cu alloy, a preparing method and a soldering method thereof. The mass percents of the components of the solder are described as follows: 10.0-16.0% of Mn, 0.5-3.5% of Co, 1.0-5.0% of Ni, 1.0-4.0% of Ti, 0.2-0.6% of Si, 0.1-.03% of B, and the balance of Cu. The soldering temperature of the copper-based solder is 1000-1050 DEG C. Moderate fusing temperature of the solder and high fusion uniformity of the solder are realized. Through adding related beneficial elements, good wetability and high metallurgical miscibility of the solder to the W-Cu alloy are realized. An obtained solder joint has high strength and high corrosion resistance and can be totally applied in a complicated environment. The solder is an economical solder with high comprehensive performance. A prepared copper-based solder foil has functions of facilitating diffusion and interface reaction between alloy elements in a soldering connecting process, improving wetting and spreading capabilities of the solder on the surface of the W-Cu alloy, and facilitating forming of a compact solder joint.

The invention belongs to the technical field of braze soldering flux for electronic packaging and assembly, and discloses a ZnSn-base high-temperature lead-free soft solder and a preparation method thereof. The ZnSn-base high-temperature lead-free soft solder consists of the following components in percentage by weight: 15 to 40 percent of tin, 0.5 to 8 percent of copper, 0.1 to 1 percent of lanthanum and neodymium mixed rare earth, 0.1 to 3 percent of magnesium and/or 0.1 to 2 percent of bismuth and the balance of zinc. The ZnSn-base high-temperature lead-free soft solder has the advantages of no toxicity and no pollution, is high in wetting spreadability and high in tensile strength and mechanical property, and can meet the using requirement of brazing and replace high-lead solders which are applied widely at present or Au-base solders with high price to meet the requirements of the fields of electronic packaging and assembly; and a melting point is between 250 and 450 DEG C.

The invention discloses a liquid-cooling cold plate, which comprises a liquid inlet connector, a liquid outlet connector, an upper cover plate, frame strip seal, fins, pad blocks and a bottom board, wherein the pad blocks and the fins are arranged in the frame strip seal; the upper cover plate and the bottom board are connected to the two sides of frame strip seal through vacuum brazing to form a sealed heat exchange cavity; the two sides of the pad blocks are connected with the upper cover plate and the bottom board through vacuum brazing respectively; the liquid inlet connector and the liquid outlet connector are connected with the upper cover plate through vacuum brazing; and the inner side surface of the frame strip seal or/and the outer side surfaces of the pad blocks contacted with a heat exchange medium are respectively provided with a groove. The liquid-cooling cold plate is simple in structure, low in cost, high in heat exchange efficiency, good in brazing process, high in welding finished product rate, more beautiful in appearance, small in flow dead zone and good in temperature uniformity.

The invention discloses low-silver copper based high-performance brazing filler metal. The low-silver copper based high-performance brazing filler metal is prepared from the following raw materials inpercentage by mass: 1.5-2.5% of Ag, 6.5-7.5% of P, 0.5-1.5% of Sn, 0.01-2% of Ni, 0.001-0.1% of Si, 0.01-0.05% of Ce and the balance of copper and inevitable impurities, wherein purity of each raw material is 99.9% or higher. A preparation method for the low-silver copper based high-performance brazing filler metal comprises the following steps of: separately preparing Ni and Cu, P and Cu, Si andCu and Ce and Cu into intermediate alloys in specific proportions; then, sequentially adding metal Cu, Cu-P, Cu-Ni, Cu-Si and Cu-Ce to melt, and adding Sn and Ag after metal is completely molten; andimmediately adding borax after adding is completed, and performing post-treatment to obtain the low-silver copper based high-performance brazing filler metal. Production cost is greatly reduced, improved brazing filler metal is high in mechanical strength and is strong in production process, and a joint is attractive in appearance and is excellent in shearing strength; according to use feedback of a user, braze-welding process performances are excellent, the braze-welding joint is stable in quality, fatigue performance is good, the service life of the braze-welding joint can be effectively prolonged, and BCu80AgP braze-welding can be replaced.

The invention discloses a silver-based brazing filler metal alloy. The silver-based brazing filler metal alloy comprises the following components of, in percentage by mass, 26%-28% of Cu; 3.5%-5.5% ofGa; at least two of the following elements of 0.001%-0.5% of Ni; 0.001%-0.5% of Co; 0.001%-0.5% of Fe; at least one of the following elements of 0.001%-0.5% of Au; 0.001%-0.5% of Pt; 0.001%-0.5% of Pd; at least one of the following elements of 0.001%-0.5% of In; 0.001%-0.5% of Sn; at least one of the following elements of La, Ce, Pr, Nd, Sm, Eu, Er, Yb, Y and Sc; and the balance Ag. The inventionfurther provides a preparation method of the silver-based brazing filler metal alloy and preparation methods of a foil strip and a wire. When the silver-based brazing filler metal alloy is used for welding a vacuum electronic device, a nickel plating process is omitted, and environmental pollution is prevented; meanwhile, the problems of high welding temperature and inconsistent melt flow pointsof Ag-28Cu-xNi alloy are solved; and the brazing filler metal alloy is good in brazing manufacturability and good in wettability, the brazing rate of kovar alloy, stainless steel and the like is higher than 95%, and the shear strength sigma b of a brazed joint is larger than or equal to 285 MPa.

Provided are a tin-based solder for aluminum/copper brazing and a preparing method thereof. The tin-based solder, by mass percent, contains 18-25% of copper, 4-7% of indium, 0.1-1% of nickel, 0.01-0.1% of rare earth lanthanum or cerium, and the balance tin. The tin-based solder is formed by simple substances of Sn, Cu, In, Ni and intermediate alloy Cu-La or Cu-Ce. The preparing method includes the following steps: 1 calculating and weighing raw materials; 2 smelting Sn-Cu-In-Ni alloy; 3 adding the intermediate alloy; 4 performing heat preservation; 5 performing cooling and taking out the solder. The tin-based solder is good in welding process performance, high in joint strength and good in corrosion resistance, and is applicable to furnace brazing and vacuum brazing of aluminum/copper dissimilar metals.

The invention discloses a vacuum brazing method of a high-temperature alloy and cobalt-based powder metallurgy material, which includes confirmation of a brazing gap; combined layout method of a gold-based brazing filler and a brazing technique. The invention realizes the preparation of a cobalt-based powder metallurgy wear-resisting material layer with excellent friction performance at the surface of a precise spare part. According to the precise spare part processed by the brazing technique, the brazing filler fills the weld joint completely, and the weld joint is good in uniformity; the coaxial dimension precision of the welding spare part is guaranteed, and the shear intensity of the weld joint is over 280 MPa.

The invention provides a single-layer high-precision brazed superabrasive grinding wheel and a manufacturing method thereof. The grinding wheel comprises a metallic basic body, and multiple metallic embedded blocks adhere to the peripheral face of the metallic basic body and are sequentially spliced to form an annular structure; abrasive layers are brazed on the peripheral faces of all the metallic embedded blocks respectively. The manufacturing method includes the steps that 1, female die blocks are manufactured; 2, an inner shape face is machined; 3, abrasive particles are fixed through electroplating or with high-temperature adhesive; 4, the metallic embedded blocks are manufactured; 5, high-temperature brazing is performed; 6, criterion alignment is performed; 7, a metallic matrix is bonded; 8, the metallic matrix is machined; 9, a female die and an electroplating layer or a high-temperature glue layer are removed. With the method, influences on thermal deformation of the basic body of the grinding wheel can be effectively reduced during high-temperature brazing, then the manufacturing precision of the grinding wheel is ensured, and the single-layer high-precision brazed superabrasive grinding wheel is easily applied and popularized in the field of precision machining.

The invention discloses a foil strip brazing filler metal for brazing sintered neodymium-iron-boron permanent magnet materials and a preparation method. The brazing filler metal comprises the following components in percentage by mass: 7.0-8.0% of Nd, 19.0-20% of Al, 8.0-9.0% of Si, 4.0-5.0% of Zn, 1.0-2.0% of Ge, 3.0-4.0% of Ag, 0.5-0.6% of Ga, 0.35-0.45% of Bi, and the balance Cu. The brazing filler metal is prepared by a melt quick cooling technology, has a melting point lower than 580 DEG C, is suitable for vacuum brazing of sintered neodymium-iron-boron magnet homogeneous materials, in particular high-coercivity H, UH magnets, and can be used for vacuum brazing of sintered neodymium-iron-boron magnets and carbon structural steel heterogeneous materials such as 10# steel; the brazing temperature is 590-605 DEG C; and the brazing joint shearing strength is higher than 55MPa.

The invention discloses a brazing filler metal for braze welding of a sintered neodymium-iron-boron magnet with a nickel-plated layer and a preparation method. The brazing filler metal comprises the following components in percentage including, by mass, 10.0-12.0% of Al, 8.0-9.5% of Si, 4.5-5.0% of Zn, 3.0-4.0% of Ge, 5.0-6.0% of Ag, 4.5-5.0% of Ni, 0.35-0.40% of Bi, 0.40-0.45% of La, 0.40-0.55% of Ce, and the balance copper. The brazing filler metal is prepared by using the rapid metal cooling technology, the melting point is lower than 532 DEG C, and the brazing filler metal is suitable forvacuum braze welding of the sintered neodymium-iron-boron magnet with the nickel-plated layer and heterogeneous materials, such as 10# steel and pure iron, wherein the braze welding temperature is 545-560 DEG C, and the shearing intensity of a braze welding joint is higher than 41 MPa.

The invention relates to the field of tool machining methods, and particularly discloses a method for improving the strength of a tool body of a planer tool. The method mainly adopts a brazing step, an isothermal quenching step and a brine quenching step; according to the brazing step, the maximum temperature and the temperature rising speed can be controlled, the time of 45 steel being in austenitization is reduced, the situation that the grain size of the 45 steel is excessively coarse is prevented, it can be ensured that the tool body has the high strength, and the welding strength in the brazing step can be improved accordingly; and meanwhile, the isothermal quenching step and the brine quenching step can enhance the strength of the whole planer tool. According to the schemed of the method for improving the strength of the tool body of the planer tool, the strength of the tool body can be improved, and the strength of the whole planer tool is improved accordingly.

The invention belongs to the field of welding materials, and relates to strip-shaped brazing filler metal for lap joint brazing of a copper plate and an aluminum plate and a preparation method thereof. The strip-shaped brazing filler metal comprises a brazing filler metal body, a coating I and a coating II, the brazing filler metal body comprises the chemical components of 3.2%-4.5% of nano-zinc oxide, 6.8%-8.2% of selenium, 2.6%-4.2% of aluminum and the balance zinc, the coating I is composed of 90%-92% of surface modified nano-copper and the balance of polyvinyl alcohol, the coating II is composed of 90%-92% of surface modified nano-aluminum and the balance of polyvinyl alcohol, and the molecular weight of the polyvinyl alcohol is 8000 to 12000. According to the strip-shaped brazing filler metal for lap joint brazing of the copper plate and the aluminum plate and the preparation method thereof, the melting point of the brazing filler metal is 330 DEG C +/-10 DEG C, the wettability of the brazing filler metal is good, and due to the existence of the nano-zinc oxide, the nano-copper coating and the nano-aluminum coating, the shear strength of a copper plate and aluminum plate brazed joint is effectively improved and reaches 121 MPa or above. The preparation method is an innovation in the aspect of the strip-shaped brazing filler metal for lap joint brazing of the copper plate and the aluminum plate.