3results about How to "Reduce inclusion content" patented technology

This invention discloses a low-hydrogen flux-cored welding wire based on two-dimensional MXene surface self-assembly modification, its preparation method, and its application, belonging to the field of welding materials technology. The low-hydrogen flux-cored welding wire comprises a steel strip outer sheath and a flux core filled within it, the flux core being composed of metal alloy powder and modified composite flux core powder. Its preparation method includes: preparing a two-dimensional MXene colloidal dispersion using a chemical etching method; cationically modifying the insulating slag-forming powder; mixing the two and electrostatically self-assembling and coating them; after drying, mixing with the metal alloy powder; filling the steel strip; and rolling and drawing into shape. This invention constructs a three-dimensional continuous conductive network within the flux core through the MXene layer, improving arc stability; simultaneously, the MXene shell forms a physically water-blocking labyrinth, endowing the welding wire with ultra-low hydrogen characteristics; the active titanium released by the decomposition of MXene at high welding temperatures can refine the weld grains and improve mechanical properties. This welding wire can be widely used in automated gas-shielded welding processes for high-strength steel.

The application belongs to the technical field of metallurgy, and provides a tundish for smelting to improve the purity of high-temperature alloy and a use method thereof. U-shaped filter screen, first sheet filter screen, second sheet filter screen and third sheet filter screen are sequentially arranged in the tundish from left to right, and a pouring opening is arranged at the bottom of the tundish. The tundish for smelting to improve the purity and surface quality of high-temperature alloy master alloy has a simple structure, and the tundish is designed without a baffle. The U-shaped filter screen can increase the contact area of the falling molten steel and effectively reduce splashing. The design of the baffle-free structure can intercept most of the slag and inclusions at the U-shaped filter screen and the first sheet filter screen in the initial pouring stage. The second sheet filter screen and the third sheet filter screen with small pore diameters reduce the pressure of slag blocking and avoid dam break accidents, reduce the pouring time, and reduce the temperature drop of the alloy liquid, thereby improving the purity of the high-temperature alloy. The content of inclusions in the high-temperature alloy master alloy prepared by smelting is controlled to be below 0.5.

The application relates to the technical field of preparation of rare earth alloy sputtering targets, in particular to a terbium-based alloy target and a preparation method thereof. The terbium-based alloy target is prepared by introducing specific amounts of Cu, Al, Ce and Ga elements on the basis of Tb, and through the mutual synergistic effect among the elements, a Tb-Cu-Al-Ga-Ce alloy target with low oxygen content, fine grains, dense and uniform structure and good processing performance is obtained; further, the alloy target can improve the sputtering film forming quality, can improve the heavy rare earth utilization rate and reduce the production cost when used for grain boundary diffusion of a neodymium-iron-boron magnet, can provide a basis for realizing the synergistic promotion of coercivity and remanence, and is suitable for large-scale industrial production in high-end application fields such as new energy vehicles and energy-saving home appliances.