7results about How to "Remove inclusions" patented technology

The present invention relates to a preparation method of low-hydroxyl and low-alkali metal high-purity quartz sand, which uses igneous rock vein quartz as raw material, first crushes the raw material to make sand, obtains raw material quartz sand, then uses HF as pH adjuster and activator, and uses dodecylamine as collector to float the raw material quartz sand; then uses HF and ferrate as composite acid solution to carry out oxidative pickling and impurity removal; after oxidative pickling and impurity removal, the quartz raw material is mixed with carbon powder, and then calcined at a high temperature of 1100-1350°C; uses halogen acid and heavy metal complexing agent as composite acid solution to pickle and impurity removal the obtained quartz raw material, and after pickling, washes and dries to obtain the low-hydroxyl and low-alkali metal high-purity quartz sand. The obtained quartz sand of the present invention can meet the standards of high-purity quartz sand for semiconductor quartz glass and high-purity quartz sand for photovoltaic quartz crucible.

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 invention relates to the technical field of precision casting, in particular to a ceramic shell and a preparation method and application thereof. The preparation method of the ceramic shell comprises the following steps: (a) coating a fired mold module with surface layer slurry, spraying sand, and drying to form a surface layer; (b) carrying out N times of back layer slurry coating, sand spraying and drying treatment on the surface layer to form a back layer; sealing slurry to obtain a wet blank; n > = 2; (c) dewaxing and roasting the wet blank; the surface layer slurry comprises a first binder, low-sodium fused white corundum powder, active alpha-Al2O3 micro powder and a first reinforcing agent; the back layer slurry comprises a second binder, low-sodium fused white corundum powder, calcined zircon powder and a second reinforcing agent; the first reinforcing agent and the second reinforcing agent comprise polyvinyl alcohol, polyacrylamide and water. The ceramic shell has chemical stability, high-temperature strength, high heat dissipation performance, high-temperature air permeability and the like, and can meet the production requirements of single-crystal high-temperature alloy turbine blades.

The method for improving the optical quality of CVD zinc selenide comprises the following steps: pre-treating and screening zinc selenide blocks: carrying out material breaking, grinding, rough polishing and detection on zinc selenide grown by a CVD method, screening out the zinc selenide blocks with different quality grades, and further screening out low-quality zinc selenide blocks containing fog layers and fog spots; cleaning: carrying out ultrasonic cleaning on the low-quality zinc selenide block containing the fog layer and the fog spots; a sheath is manufactured in advance according to the size of the zinc selenide block, the sheath is made of a pure metal material resisting the temperature and pressure of heat isostatic pressing, the purity is not lower than 3 N, and the sheath is subjected to ultrasonic cleaning; the zinc selenide block is loaded into a sheath with the proper size, the sheath is vacuumized through a vacuum pump, air in the sheath is removed, and then the sheath is sealed through hot melting welding; performing hot isostatic pressing treatment; and taking out the zinc selenide block with the sheath after the hot isostatic pressing treatment from the standard hot isostatic pressing furnace, removing the sheath sleeved on the zinc selenide block, and carrying out rough polishing detection on the zinc selenide block.

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.

The invention discloses a seamless steel pipe cold drawing extrusion device, which belongs to the technical field of steel pipe production equipment. Its structure includes an embedded sliding mechanism that can penetrate into the seamless steel pipe, a reducing hollow platform is arranged on the embedded sliding mechanism, and a cold drawing mechanism and a sizing mechanism are respectively installed at both ends of the reducing hollow platform; a plurality of extrusion pestles are arranged on the side of the cold drawing mechanism, and the plurality of extrusion pestles can move along the axis of the seamless steel pipe and rotate around the axis of the seamless steel pipe at the same time; the application can penetrate into the inner side of a seamless steel pipe with a larger diameter as a whole, and utilize a plurality of circumferentially distributed extrusion terminals to work together, so that the inner wall of the steel pipe is stressed all around, and the extrusion force at each location is balanced. As the equipment shuttles inside the seamless steel pipe, the cold drawing purpose is achieved. Since the maximum extension length of the plurality of extrusion terminals is adjustable, the inner surface finish optimization of seamless steel pipes of different sizes can be flexibly coped with, and the various components can be efficiently shared without frequent disassembly and assembly, thereby optimizing the equipment manufacturing and use costs.