31results about How to "Moderate melting temperature" patented technology

The invention discloses brazing filler metal for brazing a W-Cu composite and Fe-based alloy, a method and a brazing technique. The brazing filler metal is in a foil piece strip shape. The thickness of the brazing filler metal ranges from 50 micrometers to 100 micrometers. The brazing filler metal comprises, by weight, 6.0%-9.0% of Mn, 3.5%-5% of Co, 0.3%-1.7% of Ni, 2.0%-5.0% of Zr, 1.2%-2.8% of Ti, and the balance Cu. The brazing temperature of the brazing filler metal ranges from 1000 DEG C to 1050 DEG C, the melting temperature of the brazing filler metal is moderate, and the brazing filler metal is uniformly melted; diffusion and the interface reaction of alloy elements in the brazed connection process can be promoted through a brazing filler metal foil piece, and the wetting and spreading capacity of the brazing filler metal on the surfaces of the W-Cu composite and the Fe-based sintered alloy is improved; crystal particles are refined, residual stress is reduced, and the mechanical performance of joints is improved; the brazing technique for connecting the W-Cu composite and the Fe-based sintered alloy through the brazing filler metal is stable and reliable, vacuum brazed connection is used, a component is in a vacuum state in the heating process, the whole component does not deform, the defects such as microscopic cracks, air holes and inclusions are avoided, and the wetting and spreading capacity of the surface of the brazing filler metal is good.

The invention discloses a method for preparing a copper-based solder. The method comprises the following steps: (1) burdening: preparing a furnace burden from copper, manganese, nickel, cobalt, silicon, a copper-ferrous intermediate alloy, a copper-boron intermediate alloy and a copper-mixed rare earth intermediate alloy serving as raw materials; (2) casting: putting the prepared furnace burden into the a corundum crucible according to the sequence of manganese, copper, nickel, cobalt, silicon, copper-boron intermediate alloy, copper-mixed rare earth intermediate alloy and copper-ferrous intermediate alloy, smelting by adopting medium-frequency induction, and cooling along with the furnace to obtain an alloy blank, wherein the smelting process is performed under the protection of argon gas; and (3) rolling: rolling the alloy blank with a cold-rolling mill to obtain the copper-based solder. The copper-based solder provided by the invention can be applied to an ODS (Oxide Dispersion Strengthened) high-temperature alloy welding joint, has high brazing process performance, heat resistance, corrosion resistance and machining process, and is low in cost.

The invention relates to polybasic silver solder characterized in that the polybasic silver solder comprises, by weight, 12-28% of Ag, 37-49% of Cu, 1.0-3.0% of In, 0.5-2.5% of Ni, 0.001-0.1% of rare earth elements and the balance Zn, wherein the polybasic silver solder contains little precious metal of silver, and the content of the silver is reduced by about 20% compared with high-silver solder such as Bag40CuZnSn. Therefore, production cost is greatly reduced, and use amount of the precious metal of the silver is saved.

Disclosed are a Sn-Zn-Ag-Ni alloy lead-free solder and a preparation method thereof. The Sn-Zn-Ag-Ni alloy lead-free solder is mainly applied to low-temperature soldering of pure aluminum and aluminum alloy. The Sn-Zn-Ag-Ni alloy lead-free solder is composed of, by weight percentage, 8.0-10.0% of Zn, 0.5-1.5% of Ag, 0.5-1.2% of Ni and Sn as balance. The Sn-Zn-Ag-Ni alloy lead-free solder is low in melting temperature, good in soldering technological property and high in lubricity, achieves a welding deposition rate higher than 75% and a welding line tensile strength sigma b higher than or equal to 50 MPa, and is applicable to low-temperature soldering of the pure aluminum and various aluminum alloys such as 3A21, 6063 and 6061.

The invention discloses a low-silver copper-based solder free of a spillover phenomenon during a weld period. Aiming at the defect that the spillover phenomenon of the solder often occurs when brazing is performed by using traditional low-silver copper-based solder, the invention aims to provide the low-silver copper-based solder which is controllable in flowability and is free of the spillover phenomenon of the traditional low-silver copper-based solder during a process of welding copper and copper alloy. The low-silver copper-based solder disclosed by the invention is realized through the following technical scheme: the low-silver copper-based solder free of the spillover phenomenon during the weld period comprises the following components in weight percent: 6.6-7.8 percent of phosphorus (P), 0.5-2.2 percent of silver (Ag), 0.01-0.4 percent of indium (In), 0.001-0.2 percent of silicon (Si), 0.001-0.1 percent of rare earth and the balance copper (Cu).

The invention discloses brazing rare earth magnesium alloy brazing filler metal and a preparation method and a brazing process. The brazing rare earth magnesium alloy brazing filler metal comprises the following element components in percentage by weight: 13-19% of Zn, 1.0-3.0% of Ni, 1.8-4.4% of Al, 0.4-1.0% of Ti, 5.1-7.0% of Cu, 0.3-0.8% of Mn, 0.004-0.01% of La, 0.004-0.01% of Nd, and the balance of Mg. The magnesium alloy brazing filler metal reaches the brazing temperature of 420-460 DEG C, and is proper in melting temperature and uniform in components; and a magnesium alloy brazing filler metal foil piece facilitates acceleration of dispersion and interface reaction of all alloy elements in the brazing connecting process, so that the wetting spreadability and the gap filling performance of the brazing filler metal in a rare earth magnesium alloy are improved, the grains are refined, the residual stress is reduced, and the joint bonding strength is improved.

The invention discloses lead-free brazing filler metal for replacing high-lead high-temperature brazing filler metal, which is characterized in that the lead-free brazing filler metal comprises the following chemical compositions: 60-80wt% of Zn and 20-40wt% of Sn, wherein the melting temperature of the lead-free brazing filler metal is 199-390 DEG C, and the shear strength is 34-39 MPa. The melting temperature of the lead-free brazing filler metal is relatively appropriate, and the potentiality of the lead-free brazing filler metal for replacing the high-lead high-temperature brazing filler metal is great.

The invention discloses brazing filler metal and a process for brazing molybdenum-rhenium alloy. The brazing filler metal comprises, by weight, 7-15% of Mn, 3-6% of Co, 0-8% of Zr and the balance Cu. A method for preparing the brazing filler metal includes proportionally uniformly mixing the Cu, the Mn, the Co and the Zr with one another to obtain mixtures; preparing the brazing filler metal in the shape of a foil strap by the aid of a vacuum induction smelting furnace and a high-vacuum melt-spinning machine. The thickness of the brazing filler metal ranges from 20 micrometers to 50 micrometers. The brazing filler metal and the process have the advantages that the brazing temperature of the brazing filler metal ranges from 1020 DEG C to 1090 DEG C, the brazing filler metal has an appropriate melting temperature, the high-temperature performance of the brazing filler metal can be guaranteed, and the brazing filler metal can be uniformly molten; brazing filler metal foils are favorable for promoting diffusion and interface reaction of alloy elements in brazing connection procedures, the wetting and spreading capacity of the brazing filler metal on the surfaces of the molybdenum-rhenium alloy can be improved, crystalline grains can be refined, residual stress can be reduced, and the mechanical properties of connectors can be improved.

The invention discloses a magnesium alloy brazing filler metal based on rare earth magnesium alloy braze as well as a preparation method and a brazing technology of the magnesium alloy brazing filler metal. The magnesium alloy brazing filler metal comprises the following elements in percentage by weight: 8.8%-11.5% of Zn, 8.2%-9.3% of Al, 3.8%-5.5% of Ni, 1.0%-3.0% of Ag, 1.0%-2.0% of Ti, 0.8%-2.2% of Cu, 0.5%-1.0% of Mn and the balance of Mg. The rotary feeding device is moderate in melting temperature and uniform in ingredients; application of a magnesium alloy brazing filler metal chaff facilitates diffusion and interfacial reaction of all alloy elements during the brazed connection process, improves wetting spreadability and gap filling performance of the brazing filler metal in rare earth magnesium alloy, refines grain, reduces residual stress, and improves the bonding strength of joints.

The invention discloses a covering agent for aluminum alloy smelting and a preparing method of the covering agent. The covering agent is characterized by comprising, by mass, 20-40 parts of potassiumchloride, 20-40 parts of sodium chloride, 5-15 parts of lithium chloride, 3-5 parts of potassium fluoride, 1-3 parts of sodium hydrogen sulfate and 3-5 parts of sodium fluosilicate. The preparing method comprises the following steps that firstly, the components are prepared according to the weight part; secondly, the raw materials are sufficiently mixed and stirred evenly; thirdly, the mixture obtained in the second step is placed in a baking furnace to be dried, and the drying temperature ranges from 290 DEG C to 300 DEG C; fourthly, the dried mixture is pulverized, and powder of 80-100 meshes is formed through sieving; and fifthly, a waterproof plastic bag is used for packaging. According to the covering agent preparing technology, heat preservation of the covering agent can be effectively improved, the melting temperature is proper, and melting is rapid; a layer of oily film is formed on the surface of a casting, and casting oxidization burnout and air suction can be effectively prevented. Strong chemical stability and heat stability are achieved, molten aluminum and a furnace lining are not corroded, and original components and performance of the alloy are guaranteed.

The invention discloses brazing filler metal for brazing a SiC-based composite material and a brazing process. The brazing filler metal comprises the following elements in percentages by mass: 39-43% of Co, 8.6-12.1% of Ni, 23.6-27% of Nb and 18.5-22% of V. The melting temperature of the brazing filler metal is moderate, and the brazing filler metal is melted uniformly; by the foil-piece-shaped amorphous brazing filler metal, element diffusion and interface reaction are facilitated in a brazing connection process, metallurgical solid solution reaction between the brazing filler metal and the SiC-based composite material is facilitated, residual stress in a brazing joint is relieved effectively, and mechanical properties of the joint are improved. According to the brazing process, base metal is in a vacuum state in a heating process by vacuum brazing connection, deformation and grain coarsening do not exist, and problems of oxidation, pollution and the like are avoided; and the vacuum brazing process is stable and reliable, wetting spreadability of the surface is good, filling of brazing seams is facilitated, overall performance of the joint is improved, and therefore, the brazing joint with excellent performance can be obtained.

A covering agent for aluminum alloy smelting, characterized in that the covering agent is composed of the following components in parts by mass: 15-30 parts of potassium chloride, 20-30 parts of sodium chloride, 4-4 parts of potassium fluoride 6 parts, 2-6 parts of sodium bisulfate, 10-18 parts of lithium chloride, 4-6 parts of sodium fluorosilicate, 4-8 parts of aluminum trichloride, and 2-4 parts of cryolite. The covering agent configuration process of the present invention can effectively improve the heat preservation of the covering agent, prevent secondary oxidation, reduce the thickness of the sintered layer of the covering agent, have suitable melting temperature, fast melting and fast expansion speed, and form a layer of oily film on the surface of the casting. Effectively prevent castings from oxidizing, burning, and getting gas. It has strong chemical stability and thermal stability, has no corrosion effect on molten aluminum and furnace lining, and ensures the original composition and performance of the alloy.

A high molecular polymer powder material is characterized by comprising the following components in percentage by mass: 80-99.8 percent of high molecular polymer substrate, 0.1-5 percent of adhesion promoting resin and 0.1-15 percent of melt flow assistant. A mechanical mix process or an extrusion blending repulverizing process is adopted to uniformly mix the high molecular polymer substrate, theadhesion promoting resin and the melt flow assistant to obtain the high molecular polymer powder material; wherein the high molecular polymer powder material has excellent melt flow, and the melt flowrate thereof is at least 20% higher than the same polymer substrate without the addition of melt flow assistant, as measured according to ASTM 1238 (2015) at 160 DEG C under a load of 0.325 kg. The invention makes use of the self-leveling property of the melted high molecular polymer powder material with good melt fluidity, realizes accurate and rapid leveling of the substrate, improves the production efficiency, reduces the cost, and improves the accuracy and surface quality of the sintered workpiece.

The invention discloses brazing filler metal for brazing ZrB2-SiC ultrahigh-temperature ceramic and a process for brazing by using the brazing filler metal. The brazing filler metal comprises Cu, Ti, Zr, Ni and Co. The brazing process comprises the following steps: various raw materials are mixed to manufacture a brazing material to assemble on the ZrB2-SiC ultrahigh-temperature ceramic to form a welding sample; and the welding sample is positioned in vacuum brazing equipment, is heated to reach 910-1000 DEG C by a heating-insulation-heating-insulation mode, and is cooled to reach the room temperature. The brazing filler metal is proper in melting temperature and uniform in melting; and meanwhile, the vacuum brazing process is adopted, so that parent metal is located in a vacuum state in the heating process without the deformation and grain thickening phenomenon and without generating such problems as oxidation and pollution, the operation is stable and reliable, the surface wetting spreadability is better, the brazing gap filling is facilitated, the joint comprehensive performance is improved, and a brazing joint with excellent performance can be obtained.