68results about How to "Avoid weak bonds" patented technology

The present invention relates to a surface coating process for neodymium iron boron permanent magnetic material and a neodymium iron boron permanent magnetic material with coating layers. In the process, an electroplated bottom surface nickel layer, a chemically-coated nickel layer, an electroplated copper layer and an electroplated external nickel layer are sequentially coated on the substrate surface of the neodymium iron boron permanent magnetic material from inside to outside, and after coating, the neodymium iron boron permanent magnetic material is subjected to heat treatment in a vacuum furnace. The total thickness of the coating layers on the neodymium iron boron permanent magnetic material prepared with the process is 15-30mum, the thickness of electroplated bottom surface nickel layer is 5-10mum, the thickness of the electroplated copper layer is 5-10mum, the thickness of the electroplated external nickel layer is 5-10mum and the thickness of the chemically-coated nickel layer is 3-10mum. The coating process provided by the invention reduces the bubble formation, looseness and rust stains, enhances the adhesion of the coating layers, reduces the porosity and obtains compact coating layers, thus significantly improving the quality of the electroplated coating layers on the magnet surface, improving the indicates of a salt spray test and increasing the qualification rate of products.

The invention relates to a preparation method of a lithium-copper composite negative electrode foil piece. An intermittent local pressure enhancement method is adopted for uniformly adhering lithium metal foil pieces on the surface of a copper foil, and a lithium-copper composite negative electrode foil piece is formed. The preparation method comprises the following concrete steps: clamping the copper foil between the lithium metal foil pieces to form a lithium foil / copper foil / lithium foil sandwich layer; adopting common rolling equipment, starting a traction system, and enabling the lithiumfoil / copper foil / lithium foil sandwich layer to pass through a grinding roller, so as to form intermittent local pressure on the lithium foil / copper foil / lithium foil sandwich layer, wherein the pressure range is 0.05-5MPa, and a pre-compounded lithium foil / copper foil / lithium foil sandwich slice is formed; and enabling the pre-compounded lithium foil / copper foil / lithium foil sandwich slice to pass through the grinding roller again, and applying pressure for shaping, wherein the pressure range is 0.02-5MPa, so that the lithium-copper composite negative electrode foil piece is obtained. The preparation method provided by the invention has the beneficial effects that layer-to-layer contact of the prepared lithium-copper composite negative electrode foil piece is uniform, contact of a lithiummetal negative electrode with the copper foil is further improved, and the problem that the lithium metal foil piece and the copper foil are infirmly bonded is avoided, so that outage of lithium metal in a working process of a battery is prevented.

The invention discloses a multi-directional construction three-dimensional suspension frame structure attached to building wall bricks, which includes a fixed base, a placement plate, a hydraulic cylinder, a suction cup and a second threaded rod, and a top plate is snapped and connected to the fixed base , and the limit frame is connected by screws on the top plate, the first servo motor is welded on the fixed base, and the output end of the first servo motor is connected to the fixed shaft in rotation, and the fixed sleeve rod is welded on the side end surface of the fixed cylinder , and the bottom shaft of the fixed sleeve rod is connected with a roller, and the inner screw of the fixed sleeve rod is connected with a rubber rod. The building wall brick is attached to the multi-directional construction three-dimensional suspension frame structure and is equipped with a roller. The roller can be driven to squeeze the wall brick after construction through the fixed sleeve rod, and then when the fixed cylinder moves upward, the roller can be used again. The extrusion work of the wall bricks can ensure the stable bonding of the wall bricks under the action of cement mortar, which increases the stability of the structure.

The present application discloses a combination clasp, which includes a female clasp and a male clasp, the female clasp includes a slingshot cup and a first meson, the slingshot cup is riveted with the first meson, and the male clasp includes a convex bead and a first meson As for the second meson, the protruding bead is riveted to the second meson. The present application also discloses a method for making a combination buckle, which includes: riveting a slingshot cup to the first meson to form the female buckle; riveting a protruding bead to the second meson to form the male buckle. The above combined buckle and its production method avoid the problem of chemical glue not being firmly bonded in the high temperature process, and also avoid the characteristic of natural materials shrinking and falling off, and one less meson part than in the prior art, so that it can improve The combination fastness of the product improves the combination efficiency and reduces the production cost.

The invention discloses a growth method of graphene, which comprises the following steps of: providing an III-nitride substrate; placing the III-nitride substrate in a central area of a flat heater; introducing non-oxidizing gas to the surface of the III-nitride substrate; heating the III-nitride substrate; introducing carbonaceous materials to the surface of the III-nitride substrate as a carbon source for growing the graphene; and stopping introducing the carbon source, and continuing to introduce the non-oxidizing gas for protection and reducing the temperature to the room temperature.