132results about How to "Right melting point" patented technology

The invention relates to a lead-free solder alloy for welding the electronic elements and its manufacturing method. The lead-free solder alloy is characterized in that the main components are Sn, Ag, Cu, and Ni, and In, Bi, Pd, P, Ge, Ga, Se, Te, La, Ce, Pr, Nd, Pm, Sm, Eu, Tm are added selectively. The preparation method is characterized by taking Sn, Ag, Cu, Ni and the additional elements in proportion and smelting them at the temperature of 1300 C. to 1500 C. to obtain the intermediate alloy by using water glass covering process; melting the residual Sn and the intermediate alloy at the temperature of 300 C. to 350 C. by using water glass covering process, and casting the molten materials into alloy pig and soldering tin rod at the temperature of between 250 C. and 350 C.. The lead-free solder alloy provided by the invention can be used for welding the Ag and Pd noble metal electronic element.

A lead-free alloy as solder contains Zn (5-10 wt.%), the rare-earth elements chosen from La, Ce, Pr and Nd (0.05-1), one or more of Bi (0.1-6), Cu (0.1-3), In (0.5-3), Al (0.1-1), Ni (0.01-1) and P (0.001-1), and Sn (rest). Its advantages are better wettability, fine structure, excellent mechanical performance, low cost and no poison and pollution.

The invention discloses a low-silver lead-free soft solder, which is moderate in melting point, strong in tensile strength and low in cost. Based on the total weight of the solder, the solder contains 0.1 to 0.7 weight percent of Ag, 0.1 to 1.0 weight percent of Cu, 0.01 to 5 weight percent of Bi, 0.01 to 3 weight percent of Sb, 0 to 0.5 weight percent of Ni, 0.001 to 0.1 weight percent of P, 0.001 to 0.1 weight percent of X and the balance of Sn, wherein X is any one or combination of Ga, Ge and misch metal. The low-silver lead-free soft solder is applied to wave soldering, reflow soldering and manual soldering in the field of electronic and microelectronic packaging.

The invention relates to the technical field of welding materials, in particular to silver solder for connecting brass and stainless steel. The invention aims at overcoming the defects that existing solder for connecting the brass and the stainless steel is high in silver content and in welding cost, and providing the silver solder for connecting the brass and the stainless steel, wherein the silver solder is low in silver content and in welding cost, and non-cadmium silver solder containing more than 25wt.% of silver can be replaced by the silver solder for connecting the brass and the stainless steel. According to the technical scheme, the silver solder for connecting the brass and the stainless steel comprises components, by weight, 18-22 wt.% of Ag, 30-35wt.% of Zn, 0.3-4.5wt.% of In, 0.3-3.0wt.% of Sn, 0.1-2.5wt.% of Ni, 0.001-0.1wt.% of rare earth, and the balance Cu.

The invention discloses a tundish covering flux, which comprises the following components by mass: 5-10% of CaCO3, 60-80% of CaO+SiO2, 3.0-6.0% of Al2O3, 6.0-10.0% of MgO, 1.0-3.0% of Na2O, 0-0.5% of fixed carbon, 0-10.0% of lightweight bulk material, 2-6.0% of binder, 0-0.5% of water and the balance of inevitable impurities, wherein the ratio of CaO to SiO2 is 1.1-1.5. The tundish covering flux is added into molten steel, and then a three-layer structure comprising a slag formation layer, a sintering layer and a melting layer is formed on the molten steel. The tundish covering flux does not incrust in a using process, and has a proper melting point, spreadability and high heat-preservation performance; and the excessive temperature drop of the molten steel in a tundish can be prevented, and a slag crust is prevented from being formed on the surface of the molten steel.

The invention discloses a semicrystalline polyester resin for a TGIC-cured high-leveling powdery paint. The resin is prepared through melt phase polycondensation of the following components by weight: 29 to 45% of polyol, 45 to 65% of aromatic polyprotic acid, 5 to 15% of an acidulate agent and 0.01 to 0.15% of an esterification catalyst. The polyester resin has an appropriate degree of crystallinity, a high melting point, low viscosity and excellent storage stability; the prepared powdery paint has excellent leveling performance and mechanical properties, and a coating of the powdery paint basically has no orange peel. The invention also discloses a synthetic method for the semicrystalline polyester resin used for the TGIC-cured high-leveling powdery paint.

The invention discloses a preparation method of a high-temperature solder for brazing a TiAl-based alloy, and relates to the high-temperature solder and the preparation method thereof. The invention solves the problems that a TiAl-based alloy brazing joint obtained by using the conventional solder is low in use temperature and has low performance under a high-temperature environment, the used solder is high in price, and the solder preparation technology is complicated. The solder is made of Ti, Ni and V. The preparation method comprises the following steps of: weighing raw materials; 2, filling the raw materials in arc melting equipment, vacuumizing, filling argon, melting and alloying, and repeatedly melting and cooling. Compared with the conventional solder, the solder prepared by the invention has an appropriate melting point and good wetting property; the solder components are free of noble metals, such as Ag, Zr and the like, so the cost is low; the brazing joint has high strength under the high-temperature environment of 800 DEC, and is applicable to various joints; and the preparation method is simple and convenient.

A low-smelting-point lead-free alloy solder contains Zn, Cu, RE chosen from La, Ce, Pr and Nd, Bi and Sn. Its advantages are high wetting power and mechanical performance, no poison and pollution, and low cost.

The present invention provides a magnesium alloy rare earth compound flux and its production method. Its composition includes (wt%) 40-55% of magnesium chloride, 15-25% of potassium chloride, 12-25% of sodium chloride, 1-6% of calcium chloride, 5-15% of calcium fluoride, 1-8% of barium chloride and 3-10% of rare earth activator. Said ivnention flux has high activity, proper melting point, density, viscosity and surface tension, and can greatly raise mechanical property of magnesium alloy and corrosion resistance.

The invention discloses a high-temperature brazing filler metal used for TiAl-based alloy braze welding, and a preparation method thereof, relates to a brazing filler metal and a preparation method thereof, and solves the problems that the strength of a TiAl-based alloy braze welding joint is low in a high-temperature environment, the price of the brazing filler metal is high, the forms of adaptable joints are restricted, and the production process of the brazing filler metal is complicated. The brazing filler metal is made from TiH2, Ni, Si and C according to certain weight percentage by two steps, namely material preparation and mechanical alloying. For TiAl-based alloy, the melting point of the brazing filler metal is appropriate, the wetting property is good, the cost is low, the braze welding quality is good, the braze welding joint has good high-temperature mechanical properties, and the requirements of various types of joints are satisfied; moreover, the production process and equipment for the brazing filler metal are simple, and the production efficiency is high.

The invention relates to antistatic agent used for acrylonitrile-butadiene-styrene (ABS) resin and a method for preparing the same. Methacrylate is added to p-styrenesulfonic acid salt according to an appropriate proportion, and the methacrylate reacts with the p-styrenesulfonic acid salt under the action of initiator to generate the antistatic agent. Because the methacrylate and the p-styrenesulfonic acid salt copolymerize to generate diblock copolymer, and the diblock copolymer adjusts the high melting point of p-styrenesulfonic acid salt homopolymer, the antistatic agent can be processed in the ABS forming and processing temperature range, the antistatic performance of the ABS can be improved, and the main mechanical performance of the ABS can not be affected.

The invention relates to a low-silver electro vacuum brazing filler metal used for sealing weld of an electronic device, which belongs to the technical field of brazing materials. The low-silver electro vacuum brazing filler metal comprises the following chemical compositions in percentage by mass: 41 to 43 percent of silver (Ag), 51 to 53 percent of copper (Cu), 4 to 6 percent of stannum (Sn), less than or equal to 2 percent of indium (In) and less than or equal to 0.4 percent of nickel (Ni). The low-silver electro vacuum brazing filler metal has the advantages of: contributing to reducing the silver content so as to save resources and reduce cost, and contributing to guaranteeing a proper melting point, high plasticity and high machinability so as to replace Ag72Cu brazing filler metal.

The invention relates to a welding method of a four-wing octagonal radio frequency quadrupole cavity. The welding method includes the steps that finish machining is conducted on the inner surfaces and the outer surfaces of electrodes and side wings; the electrodes and the side walls are cleaned; electrode soldering flux tanks are arranged, and soldering flux filling is conducted; the electrodes and the side wings are combined and spliced; the assembling gap of welding faces is measured and regulated; and a vacuum cavity is formed by welding the electrodes and the side wings through a vacuum brazing furnace. The cavity prepared through the method mentioned above comprises the horizontal electrodes, the vertical electrodes and the side wings; and the corresponding electrode soldering flux tanks are arranged on the two sides of each electrode, the soldering flux tanks are filled with silver-copper alloy soldering flux, and the size of the soldering flux welding tanks is regulated according to the size of the welding faces. The welding method has the beneficial effects that the welding process is simple; by selecting the soldering flux and controlling the temperature of the welding process, outflow of the soldering flux towards the interior of the cavity is reduced to a great extent, and the soldering flux is uniformly diffused; and no soldering flux exits in the cavity, the problem that high-pressure ignition is generated when the RFQ cavity operates at a high frequency can be solved, and normal operation of the RFQ cavity is ensured.

The invention discloses a method for preparing a ternary nitric acid molten salt phase change heat storage material. The method comprises the steps of 1, weighing sodium nitrate, potassium nitrate and neodymium nitrate, and crushing sodium nitrate, potassium nitrate and neodymium nitrate through a mechanical crushing method to obtain sodium nitrate powder, potassium nitrate powder and neodymium nitrate powder; 2, mixing the sodium nitrate powder, the potassium nitrate powder and the neodymium nitrate powder to obtain a ternary nitric acid molten salt phase change heat storage material prefabricated body; 3, first melting the ternary nitric acid molten salt phase change heat storage material prefabricated body and then sequentially performing drying and ball milling crushing treatment to obtain the ternary nitric acid molten salt phase change heat storage material. According to the method for preparing the ternary nitric acid molten salt phase change heat storage material, the problems that an existing molten salt phase change heat storage material is high in cost, long in production cycle and complex in process in the preparation process are solved, and the prepared ternary nitric acid molten salt phase change heat storage material has the advantages of being wide in use temperature range, high in heat storage capability, low in corrosiveness and good in liquidity.

The invention discloses a crystal material, which is characterized in that the chemical formula of the crystal material is CaNdxEryLa(1-x-y)Ga3O7, wherein x is greater than or equal to 0.01 and less than or equal to 0.05, and y is greater than or equal to 0.1 and less than or equal to 0.3; the crystal material belongs to a tetragonal system and a space group shown in the description; the crystal material is formed into a laminated electronegative skeleton structure formed by a GaO4 tetrahedron, and Nd<3+>, Er<3+>, Ca2<+> and La<3+> are distributed among layers and have an unordered crystal structure. An Nd<+> ion is doped in Er<+3> activated CaLaGa3O7 crystal to greatly enhance the adsorption efficiency of the crystal for pump light, the efficient laser output of the -2.7mu m waveband of LD pumping is realized, the fluorescence emission of the crystal in an intermediate infrared waveband is enhanced, the service life and the particle number of 4I13/2 are greatly decreased, a self-final state bottleneck effect is inhibited, high gain is kept by laser media in an oscillation process, and the slope efficiency of the laser output is improved.

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 a coil coating resistant to wear and scratch. The main technical formula of the coil coating is as follows: the grinding process relates to the following raw materials in parts by weight: 15-20 parts of polyester resin, 30-35 parts of titanium dioxide pigment, 2-4 parts of dispersant and 8-10 parts of diluent; and the preparation process of the coil coating relates to the following components in parts by weight: 25-30 parts of polyester resin, 4-6 parts of crosslinked resin, 0.2-1 part of catalyst, 0.2-1 part of flatting agent, 2-4 parts of additive and 6-7 parts of diluent. The coating has novel formula and simple preparation method; and the wear resistance and scratch resistance of the coated metal can be improved and the coated metal has excellent performance in a harsh service environment.

The invention discloses high-entropy alloy brazing filler metal and a preparation method thereof. The high-entropy alloy brazing filler metal comprises the following chemical components in atomic percent: 10-20% of Al, 10-20% of Cu, 10-20% of Co, 10-20% of Fe, 10-20% of Ni, 10-20% of Cr, 4-12% of Si and 4-12% of B. The preparation method comprises the following steps: weighing raw materials required for smelting according to the components of the brazing filler metal; smelting the raw materials to obtain a high-entropy alloy brazing filler metal ingot; and preparing a high-entropy alloy amorphous foil belt by utilizing a vacuum quenching rapid solidification technology, or preparing high-entropy alloy brazing filler metal powder by adopting a vacuum gas atomization technology. The high-entropy alloy brazing filler metal has very high mixed entropy, the structure of the high-entropy alloy brazing filler metal is mainly a solid solution structure, the high-entropy alloy brazing filler metal can be used for brazing connection between two extremely different materials, namely TiAl alloy and nickel-based high-temperature alloy, and can keep good compatibility with the two welded base materials simultaneously, and high connection strength is obtained.