3results about How to "Remove inclusions" patented technology

The application discloses a kind of copper-aluminum composite strip continuous casting and rolling preparation methods of ultrasonic vibration assisted reinforcement, it is related to metal laminated composite material preparation technical field, including preheating treatment to copper strip and control liquidus temperature;The copper strip after preheating is introduced with liquidus into the casting and rolling crystallization area formed by casting and rolling roll and carries out solid-liquid casting and rolling composite;The composite strip obtained after casting and rolling is carried out hierarchical cooling;The composite strip after cooling is sequentially carried out cold rolling finishing and low-temperature stress relief annealing.The application fundamentally eliminates interface pore inclusion and oxide residue, solves the technical problem of large dispersion of bonding strength in conventional casting and rolling process;Grain refinement strengthening and interface structure optimization synergistically improve the interface mechanical properties;Effectively release the interface thermal stress generated by the difference of copper-aluminum thermal expansion coefficient, avoid interface cracking during cooling process;Bonding strength consistency is high, can meet the stringent requirements of new energy automobile battery connecting piece and other high reliability application fields.

The invention relates to the technical field of precious metal metallurgy, and discloses a high-density iridium ingot sedimentation type smelting process which comprises the following steps: preparing a water-cooled copper crucible with a zirconium oxide inner wall coating; iridium powder and calcium oxide powder are mixed and put into a crucible; performing induction heating in a vacuum environment until the raw materials are molten; protective gas is inflated, periodic variable-pressure oscillation operation is applied under the condition that the temperature of the melt is kept, and slag crust on the surface of the melt is destroyed through pressure fluctuation and deep gas is promoted to be exhausted; after oscillation is stopped, the melt is left to stand, and a slag system floats upwards and is separated; and establishing a bottom-to-top temperature gradient to control directional solidification of the melt. According to the invention, oxide hard shells are destroyed through a variable-pressure oscillation mechanism, and efficient degassing and impurity removal are realized by cooperating with calcium oxide slagging; the zirconia coating effectively prevents the crucible material from being polluted; the directional solidification and hot isostatic pressing process eliminates internal shrinkage cavities and looseness. According to the process, the impurity content in the iridium ingot is remarkably reduced, and the purity and compactness of the material are improved.

The application provides a titanium alloy ingot remelting method based on layered area distribution, which comprises the following steps: opening a vacuum melting furnace chamber and distributing materials in a specified area in a water-cooled copper crucible; assembling a titanium alloy consumable electrode and an auxiliary electrode on an electrode rod clamp, adjusting the electrode rod position and the centering of raw materials in the water-cooled copper crucible; automatically melting after the titanium alloy consumable electrode and the raw materials in the crucible are arc struck; after the melting is completed, starting a turnover mechanism, pouring titanium liquid from one side of the water-cooled copper crucible into a mold in a casting chamber, and cooling the remaining titanium liquid into a solid shell in the water-cooled copper crucible; crystallizing the titanium liquid into an ingot in the mold; breaking the vacuum in the furnace chamber, discharging the ingot, and simultaneously removing the solid shell in the water-cooled copper crucible for local flattening treatment and still laying on the bottom of the water-cooled copper crucible for use as a solid shell. The application makes the inclusions in the medium and high risk raw materials more easily absorbed by the solid shell at the bottom of the crucible, so as to ensure the purity of the titanium liquid.