71results about How to "Guaranteed Solderability" patented technology

This invention relates to a plane salient point encapsulation technology and its structure of IC or discrete components, among which, the technology includes: taking a base plate, dry-film layers are pasted to the front and back side of the base plate, removing part of the upper layer for the preparation of forming a basic island and pins, plating metal layers on the front, removing the rest dry film on the upper layer of the base plate, semi-etching it, removing the dry film on the back, implanting the chip, wiring, packaging with plastic capsule, pasting a dry film on the back of the base plate again, etching the dry film at the back and the rest of the metal of the semi-etched zone again so as to enable the back of the basic island and the pin projecting over the plastic capsule, removing the rest dry film, plating metal layers on the surface, pasting film on the front of the plastic capsule then cutting.

The invention relates to a high tensile Q420C level angle iron applied to pylons and a manufacturing technique thereof, belonging to the technical field of steel making and aiming at improving 0 DEG C ballistic work of the angle iron applied to power system pylons. The angle iron is characterized in that mixture ratio of chemical compositions thereof is as follows: C: 0.01-0.16%, Mn: 1.15-1.45%, Si: 0.30-0.50%, S, P: less than or equal to 0.025%, V: 0.070-0.100%, Ti: 0.004-0.010%, and the balance of Fe and Ceq: less than or equal to 0.42%. In the manufacturing technique of the invention, VN microalloying mode of production is applied to steel making, ferrotitanium is added after deoxidation and alloying, Ca wire is fed to bale liquid steel prior to continuous casting and controlled rolling and cooling is carried out in the rolling process. Measurement indicators show that the steel of the invention meet the requirements for high strength, high impact ductility and 0 DEG C impact ductility; applied to manufacturing of power transmission and transformation pylons, the angle iron of the invention, while not reducing self weight of the pylons, improves safety factor of the pylons when being used in a low temperature environment.

The invention provides lead-free tin-based solder for a solar photovoltaic module. The lead-free tin-based solder comprises, by mass, stibium 0.05 percent-0.15 percent, silver 0.01 percent-0.05 percent, copper 0.1 percent-0.4 percent, indium 0.01 percent-0.05 percent, bismuth 0.2 percent-0.5 percent, gallium 0.06 percent-0.10 percent, phosphorus 0.02 percent-0.09 percent and the balance tin and inevitable impurities. The invention further provides a manufacturing method of the lead-free tin-based solder. The manufacturing method comprises the step that stibium, silver, copper, indium, bismuth, gallium, tin and phosphorus are placed into a smelting furnace according to the mass percentage and are smelted in an inert atmosphere or a vacuum condition, and the lead-free tin-based solder for the solar photovoltaic module is obtained. According to the lead-free tin-based solder for the solar photovoltaic module, melting temperature is low, surface gloss is good, surface oxidation resistance is high, wetting performance is good, and welding quality is superior. Besides, the lead-free tin-based solder is economical, environmentally friendly and free of threat to human health, thereby being applicable to large-scale industrial production.

The invention relates to a metal active gas (MAG) welding method for butting quenched low-alloy super-high-strength steel and high-quality carbon structural steel and a low-alloy super-high-strength steel MAG welding method, which solve the welding technical problems that the thickness difference and the material performance difference of heterogeneous steel, namely the quenched low-alloy super-high-strength steel and the high-quality carbon structural steel, are large and the weldability of the quenched super-high-strength steel is low. The MAG welding method comprises the following main steps of: machining a part to be welded; quenching and tempering a 35CrMnSiA barrel piece; preheating, tacking and welding; and slowly cooling the 35CrMnSiA barrel piece; and detecting the 35CrMnSiA barrel piece. By the MAG welding method, the weldability of the quenched super-high-strength steel and the carbon structural steel is enhanced; fusion of a welding line is high; and through penetrant flawdetection and coloring flaw detection, the most sensitive crack defects of the super-high-strength steel are not found in a welding bead and a heat affected zone, so the shape of the welding line is good. The MAG welding method belongs to semi-automatic welding; and compared with manual arc welding, the MAG welding method has the advantages of reducing arc striking points and arc receiving points, so that welding defects can be reduced effectively.

The invention relates to the technical field of non-ferrous metals, in particular to a high-strength weldable aluminum alloy for vehicle bodies and a preparation method thereof. The alloy comprises: 4.8-6.6wt.% of Zn, 1.0-2.0wt.% of Mg, 0.08-0.16wt.% of Zr, 0.03-0.06wt.% of Sc, 0.01-0.03wt.% of Ti, less than 0.15wt.% of Fe, less than 0.15wt.% of other unavoidable impurity elements, each of which is not less than 0.05wt.%, and the balance Al. The preparation method consists of: subjecting a cast ingot obtained by semicontinuous casting to uniform annealing at 200-220DEG C for 2h, then conducting furnace heating to 470-480DEG C and performing thermal insulation for 8h, then conducting hot extrusion and online water-crossing quenching, then performing heat preservation at 480-490DEG C for 1-3h, and conducting solution treatment, performing water quenching, then carrying out heat preservation at 130-160DEG C for 12-24h and conducting aging treatment. By adding elements Zr, SC and Ti, a lot of Al3Zr(Sc, Ti) dispersed phase is generated in the alloy to play a role of inhibiting recrystallized grains from nucleating and growing and obstructing dislocation migration, thereby obtaining excellent strength and toughness. The high-strength weldable aluminum alloy can be suitable for production of high-strength light structural parts for vehicle bodies.

The invention discloses a method for testing the weldability of an SMD (Surface Mounted Device) product. After the SMD product is subjected to steps of ageing, immersing in flux, immersing in soldering tin and drying with air, the weldability of the product is judged by observing a covering degree of a tin layer on the surface of the product. The method is simple and direct, expensive detection equipment does not need to be purchased, and thus the weldability of the SMD product is guaranteed while the detection cost is greatly reduced.

The invention belongs to the technical field of semiconductor devices, and particularly relates to a lead frame for semiconductor packaging and a preparation method thereof. The lead frame comprises aframe body and an electroplating layer, the upper surface of the frame body is provided with a plurality of micro-etching grooves, each micro-etching groove is filled with the electroplating layer, and the thickness of the electroplating layer is the same as that of each micro-etching groove. According to the lead frame disclosed by the invention, the concave micro-etching grooves are formed in the frame body in a mode of first micro-etching and then electroplating, so that the electroplating layer is formed in the micro-etching grooves, and through reasonable control of micro-etching and electroplating processes, the thickness of the lead frame can be reduced, the thinning production of semiconductor packaging is facilitated, the effect of protecting the electroplating layer can also beachieved, and therefore, the weldability and the product percent of pass can be better ensured.

The invention relates to a dual-concave high-voltage ceramic capacitor and a manufacturing process thereof. A ceramic dielectric substrate of the capacitor is shaped like a cylinder, two truncated cone-shaped gaps are formed in the cylinder, and then two concave portions are formed, that is to say, the thickness of the edge of the ceramic substrate is greater than that of the center. A transition surface with an arc line being the cross section is arranged between a round surface in the center of the ceramic substrate and a concave inclined surface of a truncated cone-shaped side surface. The ceramic substrate is provided with an electrode. The electrode is divided into three layers, wherein the top layer is tin alloy. The electrode is welded to a lead wire. Epoxy resin wraps the substrate, the electrode and part of the lead wire. The manufacturing process of the capacitor includes ceramic substrate manufacturing, electric polarization, lead wire welding, coating, printing, and testing. The electrode of the capacitor is manufactured through magnetron sputtering, and can be freely controlled in size. Through the design of the transition surface in the substrate concave parts, point discharge risks of the electrode are reduced, the over-voltage resistance of the capacitor is further improved, and the capacitor can become miniature. Through the design of a copper-tin alloy layer, the electrode can still be welded if part of the electrode is oxidized.

The invention relates to a production process for diodes. The production process comprises five steps of acid washing, electroplating, welding, insulation protection and post-treatment. The production process for the diodes has the advantages that the steps of acid washing, welding and welding are performed in sequence; a chip is subjected to acid corrosion before welding, so that solders and metal impurities in lead wires are prevented from reacting with an acid liquid to influence a corrosive rate of the chip in the acid washing process; metal ions generated by reaction of metal and acid are prevented from being adhered to the surface of the chip, so that large amounts of washing processes are removed and resources are saved; the faults such as electric degradation and high-temperature thermal breakdown of a product are avoided, so that the electric yield of the product is increased; and meanwhile, the metal content of a discharged washing liquid is reduced and the soil pollution is alleviated, so that the environmental protection is facilitated.

The invention relates to an electrode for projection welding of a resistor. The electrode comprises an upper electrode assembly and a lower electrode assembly. The upper electrode assembly comprises an upper electrode body. The lower electrode assembly comprises a circulation water cooling block, an electrode holder, an electrode cover and a positioning pin. The circulation water cooling block is provided with a cooling hole, a connecting block is embedded in the cooling hole, and the top end of the electrode holder is embedded in one end of the cooling hole. The electrode cover comprises a cover body and a base, the base of the electrode cover is embedded in the other end of the cooling hole, and the top end of the electrode holder is connected with the base of the electrode cover through the connecting block. The positioning pin comprises a positioning body and a positioning head, the positioning body is embedded in the electrode cover, and the positioning head corresponds to the upper electrode body. By means of the electrode for projection welding of the resistor, the cooling effect of the electrode cover is improved, damage to the electrode holder is avoided, the use cost of the electrode assemblies can be saved, and management burden is relieved.

The invention provides an aluminum silicon carbide high-power LED radiator and a preparation method thereof. The preparation method comprises the following steps: proportioning, ball-milling and mixing, granulating, and pretreating raw materials to obtain granulated powder; forming the granulated powder into a silicon carbide ceramic prefabricated part through a cold isostatic pressing technology; sintering the formed silicon carbide prefabricated part; smelting a ZL101A aluminum alloy to obtain an aluminum alloy melt; putting the silicon carbide ceramic prefabricated part into a steel mold through a vacuum pressure infiltration method, pressing molten aluminum alloy into pores of the silicon carbide ceramic prefabricated part by adopting high-pressure inert gas at a certain temperature in a vacuum environment, and carrying out heat treatment to prepare an aluminum silicon carbide casting; and carrying out surface metallization plating process treatment on an aluminum silicon carbide finished product to form the aluminum silicon carbide high-power LED radiator. The method overcomes the defects of complex process, expensive equipment, long production period and high energy consumption, has the advantages of compact products, excellent performance, simple operation and low cost, and is wide in application range.

The invention discloses a construction method for a gear case of a self-elevating platform lifting system. According to the method, the gear case is segmented into two assemblies to be constructed, and the two assemblies include a gear case body assembly and a gear case side cover assembly. The method specifically comprises the following steps that firstly, the gear case body assembly and the gear case side cover assembly are constructed; and secondly, the constructed gear case body assembly and the constructed gear case side cover assembly are combined. The method is utilized for constructing the gear case of a self-elevating platform lifting mechanism, and the construction problems that a gear case of a self-elevating platform lifting mechanism is high in welding requirement, and space is narrow and closed are solved; and through reasonable breaking joints of components, the reasonable component division and installing sequence and groove arrangement refining, the segmented constructability of the gear case of a platform is achieved, and weldability of components in the gear case is guaranteed.

Disclosed herein is a thick steel plate for welded structure having excellent strength and toughness in a central region and exhibiting small variation in properties through thickness. The steel plate comprises 0.05 - 0.10 % of C, 0.10 - 0.5 % of Si, 1.3 - 1.7 % of Mn, 0.0005 - 0.0025 % of B; 0.005 - 0.03 % of Ti, 0.010 % or less of N, 0.005 - 0.03 % of Nb, 0.005 - 0.055 % of Sol. Al, and the balance of Fe and other unavoidable impurities, in terms of weight%, wherein a content ratio of Ti/N is 2.0 or more, and a CP represented by Expression 1 is 40 - 50. CP = 165 x %C + 6.8 x %Si + 10.2 x %Mn + 80.6 x %Nb + 9.5 x %Cu + 3.5 x %Ni + 12.5 x %Cr + 14.4 x %Mo ... (l).

The invention belongs to the field of preparation of steel and iron materials, and discloses ultrahigh-strength steel with the fatigue limit larger than 600 MPa for ocean engineering and a preparation method thereof. The ultrahigh-strength steel comprises the chemical components in percentage by weight: 0.08-0.11% of C, 0.20-0.50% of Si, 0.70-1.00% of Mn, 6.00-8.00% of Ni, 0.50-0.70% of Cr, 0.80-0.90% of Mo, 0.05-0.08% of V, less than or equal to 0.003% of P, less than or equal to 0.001% of S and the balance Fe and inevitable impurities. According to the steel plate manufacturing method of the ultrahigh-strength steel, a controlled rolling process is adopted, then a steel plate is subjected to a quenching and tempering heat treatment process, the yield strength of the steel plate is larger than or equal to 1000 MPa, the fatigue limit is larger than or equal to 600 MPa, and the impact energy at the temperature of -80 DEG C is larger than or equal to 100 J; and the microstructure of the steel plate is tempered martensite and VC precipitated phase.

The invention relates to the technical field of metal wires, and especially relates to an antibacterial antistatic composite Fe-Cr-Al fiber, comprising a fiber body. The fiber body is formed by winding two Fe-Cr-Al fibers, a brass fiber, and a nano-silver fiber. The surfaces of the Fe-Cr-Al fibers, the brass fiber, and the nano-silver fiber are coated with an active agent kind antistatic agent. The antibacterial antistatic composite Fe-Cr-Al fiber effectively improves strength and hardness of the Fe-Cr-Al fiber, and the surfaces are coated with the active agent kind antistatic agent, so antistatic property of the Fe-Cr-Al fiber is greatly improved, and toughness, electrical conductivity, weldability, and temperature resistance and rotproofness of metal are maintained, and the fiber has flexibility and spinnability of common fibers. The fiber has effects of effective sterilization and deodorization, and the fiber is used to manufacture a plurality of kinds of metal fiber products.

The invention relates to a plane point-protruded type packaging process and its structure of integrated circuit or discrete component, comprising following steps: pasting dry films (2, 3) on the two surfaces of a metallic base plate (1) while removing some dry films relatively; plating active compound and metallic layer on the area of base plate for forming base island and pins; removing the left dry film on the front of base plate; half etching to form a depressed half etched region (1, 3), base island 1.1 and pin 1.2; removing the dry film left on the back of base plate; planting chip (9) into the front metal layer of base island, tie metallic thread (10), packaging plastic packaging body (11), front printing (12), and etching again on the left metal 1.4 of half etched region (1.3); pasting film (13) on the face of plastic packaging body, and slicing. Said invention has strong welding property, better quantity, low cost, good adaptability, reflex able arrangement of chips, while avoiding the problem of infiltration of plastic packaging material.

The invention discloses a production process of a 8630MOD3-85K forge piece for a deep sea wellhead casing hanger. A steel blank of the 8630MOD3-85K forge piece comprises the following chemical components in percentage by weight: 0.25 to 0.33 percent of C; 0.15 to 0.35 percent of Si; 0.7 to 1.1 percent of Mn; less than or equal to 0.015 percent of P; less than or equal to 0.01 percent of S; 0.85 to 1 percent of Cr; 0.75 to 0.99 percent of Ni; 0.35 to 0.45 percent of Mo; less than or equal to 0.25 percent of Cu; less than or equal to 0.025 percent of Ti; less than or equal to 0.01 percent of Bi; less than or equal to 0.012 percent of N; less than or equal to 0.01 percent of Nb; 0.02 to 0.035 percent of Al; less than or equal to 0.015 percent of Sn; 0.002 to 0.03 percent of V; less than or equal to 0.0005 percent of B; less than or equal to 0.01 percent of Pb; less than or equal to 0.02 percent of As; less than or equal to 0.02 percent of Sb; less than or equal to 1.6 ppm of H; less than or equal to 25 ppm of O; less than 0.833 percent of CE, and the balance Fe; and the DI value is larger than 8.0.

The invention relates to a high-strength heat exchanger. The high-strength heat exchanger comprises cover plates installed symmetrically up and down, and a plurality of heat exchange channels are installed between the cover plates. The heat exchange channels structurally comprise first partition plates and second partition plates arranged at intervals up and down, evenly arranged fins are installed between the first partition plates and the second partition plates, sealing strips are installed at two ends of the fins, H-shaped reinforcing ribs are installed in the middle of the fins and are of an integrated structure, two sides of the H-shaped reinforcing ribs respectively abut against the fins, the upper end faces and the lower end faces of the H-shaped reinforcing ribs respectively abut against the first partition plates and the second partition plates, and the H-shaped reinforcing ribs are installed right in the middle of the heat exchange channels. The high-strength heat exchanger is reasonable in structure and convenient to manufacture; by installing the reinforcing ribs in the middle of the fins in the heat exchange channels, the contact area of the fins and the partition plates is increased, the strength of the heat exchanger is enhanced, and the high-strength heat exchanger is high in bearing capability and long in service life.