4results about How to "Overcoming brittleness" patented technology

This invention relates to the field of insulating materials for porous copper foil preparation, and particularly to an insulating material for porous copper foil preparation and its preparation method, as well as a method for preparing porous copper foil. The preparation method includes the following steps: perforating a cathode plate to obtain a cathode plate with multiple blind holes; filling the blind holes with an insulating material for porous copper foil preparation, and curing it to obtain a pretreated cathode plate; the raw materials for the insulating material are: resin, reactive diluent, thixotropic agent, leveling agent, polymerization inhibitor, and photoinitiator. The pretreated cathode plate is used as the cathode and placed in an electrolyte for electrodeposition to obtain porous copper foil. When preparing porous copper foil with the insulating material, the filling material in the blind holes can withstand more than 80 electroplating cycles without peeling off, indicating that the insulating material for porous copper foil preparation possesses excellent adhesion and electrolyte environment durability, enabling a single-filled cathode to support stable electrodeposition over an ultra-long period, significantly extending its effective service life.

The application relates to the technical field of ceramic materials, and particularly discloses a high-temperature-resistant silicon carbide composite ceramic material and a preparation method. The composite ceramic material comprises, from inside to outside, an interface modification framework, a structural matrix layer and a protective matrix layer; the interface modification framework is prepared by impregnating and calcining a bifunctional modified carbon fiber web with a titanium-aluminum precursor sol; the structural matrix layer is prepared by impregnating an inner layer slurry into the interface modification framework and solidifying; the protective matrix layer is prepared by coating a surface layer slurry on the surface of the structural matrix layer and solidifying; and the inner layer slurry and the surface layer slurry are both prepared from polycarbosilane precursors, modified silicon carbide and anhydrous toluene. Through the synergy of multiple weak interface toughening, precursor molecular-level hybrid self-repairing and gradient densification processes, the inherent brittleness of the ceramic is overcome, and the fracture toughness and super-high-temperature oxidation resistance of the material are improved.

The application discloses a high-pressure die-casting motor rotor casting aluminum alloy and a preparation method thereof, and belongs to the technical field of motor rotor materials. The high-pressure die-casting motor rotor casting aluminum alloy comprises the following components in percentage by mass: Mg 0.75-0.85 wt%, Fe 0.15-0.25 wt%, Ti≤0.03 wt%, Ga≤0.03 wt%, Zn≤0.03 wt%, Cu≤0.03 wt%, Mn≤0.01 wt%, Si≤0.01 wt%, other impurities≤0.35 wt%, and the balance of Al. The type of elements and the percentage by mass of each element are specifically limited, the percentage by mass of Si is reduced, the influence of Si on the electrical conductivity of the aluminum alloy is reduced, the electrical conductivity of the aluminum alloy is improved to a certain extent, the percentage by mass of Mg and Fe is limited, Mg forms a solid solution in Al, Fe interacts with Al to form phases such as Al3Fe, and the strength and hardness of the aluminum alloy are improved, so that the balance between the mechanical properties and the electrical conductivity of the motor rotor casting aluminum alloy is achieved.

The application relates to a zirconia / silicon carbide / silicon oxide nanofiber and a preparation method and application thereof. The method comprises the following steps: adding a liquid silicon source into a zirconium sol solution, stirring uniformly to obtain a spinning solution; performing electrostatic spinning on the spinning solution, drying to obtain a nanofiber precursor; performing oxygen-free sintering to obtain the zirconia / silicon carbide nanofiber; wherein the zirconia serves as a fiber center; a silicon carbide layer is coated outside the zirconia; heat treatment is performed to oxidize the silicon carbide layer close to the outer surface to obtain the zirconia / silicon carbide / silicon oxide nanofiber. The technical problem to be solved is how to provide the zirconia / silicon carbide / silicon oxide nanofiber, so that the nanofiber has high elasticity, high flexibility, low density, low thermal conductivity, strong comprehensive performance and greatly expands the popularization and application of the zirconia fiber.