12results about How to "Improve solderability" patented technology

This invention relates to the field of metallurgical technology, specifically to an ultra-low yield strength ratio, high-phosphorus, atmospheric corrosion-resistant steel and its preparation method. The preparation method includes: placing a cut billet into a slow-cooling pit, with the initial slow-cooling temperature ≥500℃ and the final slow-cooling temperature not lower than 300℃; heating the slow-cooled billet, controlling the billet's exit temperature from the furnace to 1140~1170℃, and the furnace time coefficient to be 10~11 min / cm; employing a two-stage rolling process, with the billet undergoing the first stage of rolling after descaling, and the surface temperature of the rolled piece at the start of the second stage of rolling being T2=(T+1600 / H-1.8H)℃, and the rolled steel plate not being water-cooled; and then placing the rolled steel plate between steel plates at 500~600℃ for at least 48 hours to achieve stacking cooling. This invention utilizes a fine, uniform microstructure and phosphorus and chromium compounds to improve the material's corrosion resistance, meeting the requirements for corrosion resistance and high toughness of steel used in building and engineering structures in coastal atmospheric environments.

The invention discloses superaustenitic stainless steel based on the synergistic effect of Mo and N and a preparation method of the superaustenitic stainless steel, and belongs to the technical field of high-performance metal materials. The stainless steel comprises the following components in percentage by mass: 26.0%-26.5% of Cr, 3.48%-4.52% of Mo, 0.29%-0.51% of N, 23.0%-25.0% of Ni, less than or equal to 0.01% of C, 0.40%-0.65% of Mn and the balance of Fe and inevitable impurities. According to the method, on the premise that the PREN value is kept basically unchanged, the point corrosion resistance of the stainless steel in a chloride ion-containing medium is remarkably improved by synergistically reducing the Mo content and increasing the N content and utilizing the interaction effect of Mo and N. The synergistic effect is embodied in inhibiting pitting initiation, slowing down pitting extension, promoting repassivation and forming a more protective passive film structure. The material is especially suitable for harsh corrosive environments such as offshore oil and gas exploitation and seawater desalination.

The utility model relates to medical instrument technical field especially, more particularly to a kind of adapter applied to monitor, including shell, shell is covered with plug, connecting seat and socket connected in sequence, wherein, the front end of plug is provided with two rows of connecting holes, the rear end of plug is equipped with two rows of elastic sheet corresponding with connecting hole and two skeletons for fixing elastic sheet, and skeleton is connected with plug.The elastic sheet is installed in the plug in the application, the connecting hole is corresponding with the elastic sheet, when the adapter is inserted or pulled out from the connector of monitor, the convex needle is contacted or disconnected with the elastic sheet, so that the elastic sheet occurs elastic deformation or rebound movement, the structure and manufacturing process of elastic sheet are simple, and have good elasticity, conductivity and weldability, the production cost is lower, meet the demand of disposable wrapping use.

This utility model relates to the field of flattening roller technology, and proposes a flattening roller structure, including a fixing part and a flattening part. The flattening part is coaxially fixed to the fixing part and is used to flatten the electrode tab. The flattening part has a conical structure, and the outer diameter of the end of the flattening part near the fixing part is larger than the outer diameter of the end away from the fixing part. It also includes a blocking part, which is coaxially fixed to the end of the flattening part away from the fixing part, and the periphery of the blocking part extends outward from the periphery of the flattening part. This utility model, by providing a blocking part at the end of the flattening part and allowing the periphery of the blocking part to extend outward from the periphery of the flattening part, allows the blocking part to guide the electrode tab when the flattening part flattens it, preventing the electrode tab from blocking the center hole of the winding core. This eliminates the need for other components to block the center hole of the winding core in the flattening mechanism, reducing the structural complexity of the flattening mechanism and improving its overall performance and cost-effectiveness.

The utility model relates to the technical field of resistors, and discloses a high-power thick-film resistor which comprises a resistor body, a rectangular groove is formed in the upper end of the front surface of the resistor body, a replacement mechanism is arranged in the rectangular groove and comprises a connecting block and two screws, the connecting block is installed in the rectangular groove in a sliding mode, and the two screws are arranged in the rectangular groove. Two pins are fixedly connected to the front surface of the connecting block, two threaded grooves are formed in the upper surface of the connecting block, the two screws are installed in the two threaded grooves in a threaded mode, and through the arrangement of the connecting block and the two screws, the two screws can be rotated, so that the connecting block and the pins are detached from the interior of a rectangular groove in the resistor body; according to the high-power thick-film resistor provided by the utility model, the two pins can be replaced, so that after the high-power thick-film resistor is welded for multiple times, the two pins can be replaced, the thick-film resistor keeps relatively good weldability, and the use efficiency of the high-power thick-film resistor is improved.

The invention discloses a low-temperature toughness structural steel plate and a production method thereof, and belongs to the technical field of structural steel, the low-temperature toughness structural steel plate comprises the following chemical components by mass percentage: 0.130-0.145% of C, 0.25-0.4% of Si, 1.45-1.55% of Mn, less than or equal to 0.018% of P, less than or equal to 0.003% of S, 0.018-0.028% of Nb, 0.015-0.035% of Als, less than or equal to 0.43% of CEV, and the balance of Fe. According to the mechanical properties of the steel plate, the yield Rel is larger than or equal to 400 MPa, the tensile strength Rm is larger than or equal to 540 MPa, the elongation A is larger than or equal to 28%, the longitudinal impact toughness at the temperature of-60 DEG C is larger than or equal to 100 J, the transverse impact toughness at the temperature of-60 DEG C is larger than or equal to 80 J, the CEV is smaller than or equal to 0.40%, and the steel plate has excellent obdurability, low-temperature impact performance and welding performance and can meet the use requirements of various light and thin foundation steel structural parts at the temperature of-60 DEG C.

The invention relates to the technical field of solar cells, and provides a cell electrode printing method, a back contact cell and a photovoltaic module. The method comprises the steps that a screen printing plate is not changed, an N-type auxiliary grid and a P-type auxiliary grid are firstly printed, a main grid is finally printed, main grid printing is a sequence of overlapping and printing the main grid in three working procedures, and a composite electrode structure is formed on the back face of the battery. According to the invention, the step effect of the auxiliary grid printing can be eliminated and the forming uniformity of the main grid can be optimized through the matching of the printing sequence of the first auxiliary grid and the multi-channel main grid, so that the line width of the auxiliary grid is effectively reduced, the height-width ratio is improved by about 3-5%, the unit consumption of silver paste is saved by about 5-10% under the condition that the design line width of the screen printing plate is not changed, and meanwhile, a foundation is laid for 1-3 mu m lower detection of the design line width of the screen printing plate; and the series resistance and electrode shading loss can be effectively reduced.

The invention discloses a connector and a processing method. The connector comprises a shell; a plurality of contact elements are arranged on the shell in an array penetrating manner; the shell comprises an extending part and a connecting part, and the connecting part forms a bulge towards the outer side of the extending part; the end faces, close to one side of the extending part, of the extending part and the protrusion of the shell are first non-plating areas, and the end face of the connecting part and the side face of the protrusion are first plating areas. The first plating layer area is locally selected for plating nickel, palladium and gold on the connector shell to cover the insertion contact welding area of the connector and the T / R assembly interface, so that the conductivity, weldability, wear resistance and corrosion resistance of the contact area of the connector and the T / R assembly interface are improved, the dielectric pressure resistance is improved, and the manufacturing cost is effectively controlled. The housing and the contact element are integrally connected, so that heat generated during working of the T / R assembly can be quickly led out, performance degradation of an interconnection interface of the connector caused by high temperature is effectively avoided, and stable operation under a high-power-density working condition is ensured.

The invention relates to a piezoelectric composite material with enhanced electrodes and a preparation method. The piezoelectric composite material comprises a piezoelectric ceramic array, an upper-layer enhanced electrode and a lower-layer enhanced electrode which are respectively positioned on the upper surface and the lower surface of the piezoelectric ceramic array, and a polymer filled in gaps among the upper-layer enhanced electrode, the piezoelectric ceramic array and the lower-layer enhanced electrode. The mechanical strength, the wear resistance and the welding reliability of the electrode are fundamentally improved, effective protection and mechanical locking are provided for the piezoelectric ceramic column, and the structural integrity, the machining yield and the long-term stability of a product are remarkably improved.

This invention provides a high-temperature conductive silver paste for a microcrystalline glass thick-film heating plate, its preparation method, and sintering process. The high-temperature conductive silver paste for the microcrystalline glass thick-film heating plate, by mass percentage, comprises: silver powder: 75-85%; composite glass powder: 1-5%; organic carrier: 10-24%. The composite glass powder comprises component A and component B in a mass ratio of 1-3:1. Component B is silicon micropowder. Component A, by mass percentage, comprises: silicon oxide: 35-50%; boric acid: 20-30%; magnesium oxide: 10-15%; aluminum oxide: 5-10%; titanium oxide: 3-5%; and zirconium oxide: 1-2%. The high-temperature conductive silver paste for the microcrystalline glass thick-film heating plate prepared by this invention has high solderability, strong adhesion, a maximum operating temperature exceeding 450℃, strong resistance to high current impact, high re-firing stability, and excellent overall performance.

The application discloses a kind of composite tin paste for SEM chip and preparation method thereof, belong to composite tin paste technical field, including SnAgCu alloy spherical powder, spherical copper powder and soldering paste;Wherein, the particle size range of SnAgCu alloy spherical powder is 20~75 μm;The particle size range of the spherical copper powder is 1~60 μm;The mass percentage of the spherical copper powder in the total mass of alloy contained in the composite tin paste is 20%~70%;The soldering paste includes by mass percentage: rosin resin 40%~60%, organic acid activator 5%~15%, thixotropic agent 3%~8%, antioxidant 0.1%~5%, and the balance is organic solvent.The application adds the spherical copper powder with mass percentage 20%~70% and particle size range 1~60 μm in SnAgCu alloy spherical powder, substantially replaces expensive silver, significantly reduces the raw material cost of tin paste under the premise of guaranteeing or even improving welding performance, overcome the technical problems that the cost of existing SnAgCu tin paste is high due to high silver content.

The utility model belongs to shielding case technical field, concretely relates to a new energy automobile sensor shielding case, including the cover body of integrated structure, elastic buckle and support leg, material selection chooses white copper or tinplate, is made through blanking, bending process, has nickel on the surface electroplating, on the basis of nickel plating layer, electroplating has a layer of bright tin again, the side of cover body is equipped with the reserved hole, the part of cover body connection is shaped to have dovetail block, forms the dovetail groove between every two dovetail blocks, the dovetail block of cover body both ends is alternately distributed, and the elastic buckle is used for reinforcing sensor and cover body fixed strength, is located in the reserved hole, the support leg is L type, and the length end of a section is vertically arranged with cover body, the other section is parallel with cover body, and the lower end of the section of support leg parallel with cover body is equipped with the protruding part, and the vertical mounting hole is equipped in the support leg middle. Through the setting of above-mentioned component, not only shielding case shielding effect is good, and makes the installation fixed effect of shielding case and sensor good while the convenience of dismounting improves, reduces production cost simultaneously.