3results about How to "Increase nucleation point" patented technology

The application belongs to the technical field of continuous casting and particularly relates to a high-nitrogen Fe-Ni-based alloy protective slag. According to mass percentage, the high-nitrogen Fe-Ni-based alloy protective slag comprises SrO: 14-16%, CaF2: 11.5-13.5%, SiO2: 24-26%, Na2O+K2O: 12-14%, B2O3: 7-9%, Al2O3: <1%, MgO: 8-10%, La2O3: 10-12%, and the rest is carbonaceous material and inevitable impurities. Through accurate slag system design and component regulation, the protective slag has excellent performances of rapid slag formation, high lubrication and phased heat control, effectively solves the crack problem in the high-nitrogen Fe-Ni-based alloy continuous casting process, and meets the actual needs of the large-scale production of the continuous casting.

The invention relates to a titanium-containing hot-dip aluminum-zinc alloy coating, a steel plate and a preparation method of the titanium-containing hot-dip aluminum-zinc alloy coating, and the alloy coating comprises the following chemical components in percentage by weight: 55.0% of Al, 1.6% of Si, 0.010%-0.050% of Ti and the balance of Zn. The alloy coating steel plate comprises a steel substrate and a titanium-containing hot-dip alloy coating attached to the surface of the steel substrate. The preparation method comprises the following steps: S1, preparing a plating solution; s2, pretreatment of the steel matrix; s3, carrying out a hot dipping process; s4, carrying out post-treatment; the method has the beneficial effects that the content of Ti in the plating solution is accurately regulated and controlled, hot dipping technological parameter optimization is combined, uniform refining of a plating layer structure is achieved, heterogeneous nucleation of Al-rich phase dendritic crystals can be efficiently promoted, the spangle size is reduced to be within 200 micrometers from 800 micrometers, meanwhile, the side effect that zinc slag is increased due to excessive Ti is avoided, the hardness of the refined plating layer is improved by 30%-50%, grain boundary distribution is uniform, and the plating layer has the good corrosion resistance. The performance is obviously improved.

The application relates to a low-temperature concentration method for reducing crystallization entrainment. The low-temperature concentration method for reducing crystallization entrainment described in the application introduces small-molecule gas to form hydrate crystal nuclei or small crystals to serve as the crystal seeds of the freeze concentration before the stage of the freeze concentration crystallization phase change, can reduce the freeze concentration crystallization supercooling degree, and promotes the freeze concentration to occur. In the stage of the freeze concentration phase change, the gas is continuously introduced to enhance the heat transfer, increase the nucleation points, promote the crystallization to occur, form more small ice crystals, effectively reduce the generation of large ice crystals, and reduce the entrainment rate. Compared with single freeze concentration, the low-temperature concentration method for reducing crystallization entrainment adopting the embodiment of the application saves time by more than 10%, reduces the ice crystal entrainment rate by more than 10%, and improves the quality by more than 15%.