3results about How to "Eliminate casting defects" patented technology

The present application relates to the technical field of metal precision forming, and particularly relates to a copper micro-channel liquid cooling radiator and a liquid forming manufacturing method thereof, which comprises the following steps: S1, a soluble ceramic core with a micro-channel negative structure is prepared by using a template method, and the surface of the core is pretreated to reduce the wetting angle; S2, the pretreated core and an outer mold sprayed with a release agent are assembled to form a casting cavity; S3, copper liquid subjected to flowability improvement treatment is smelted and cast in a vacuum or a protective atmosphere; S4, directional solidification of the casting is guided by using multi-section induction heating combined with online temperature control; and S5, the core is removed by chemical dissolution. Through the synergy of bidirectional wetting control, a template method soluble core and directional solidification technology, the present application realizes high-quality and low-cost batch manufacturing of a complex three-dimensional micro-channel copper radiator, and the prepared radiator has a complete micro-channel structure and high internal density, and is suitable for high-power heat dissipation scenes in the fields of high-performance computing, power electronics, new energy and the like.

This invention discloses a method for preparing a high-strength, high-thermal-conductivity Mg-Zn-Cu-Mn magnesium alloy, belonging to the field of magnesium alloy preparation technology. Metal raw materials are prepared according to the atomic percentage ratio of each constituent element in the Mg-3Zn-3Cu-xMn alloy (0≤x≤1). Then, alloy melting, homogenization treatment, and hot extrusion deformation are performed sequentially. The extrusion temperature is 260-270℃, and the extrusion speed is 0.3-0.6 mm / s. This invention achieves homogeneous dispersion of Mn to cluster precipitation in the Mg-Zn-Cu magnesium alloy through Mn alloying modification treatment. When 0.6 wt.% Mn is added, the alloy exhibits the best thermal conductivity and tensile strength. This invention refines the grain size of the Mg-Zn-Cu-Mn magnesium alloy and eliminates some casting defects, thereby further improving the alloy's strength and thermal conductivity.

The application provides a high-toughness (alpha+beta) dual-phase magnesium-lithium alloy rod and a preparation method thereof, and contains, in percentage by mass, Li: 8-11%, Al: 2-6%, Sn: 1-5%, rare earth elements (RE): 0.5-4%, Ca: 0-1%, Mn: 0-1%, Ag: 0-0.5%, and the balance of magnesium and inevitable impurities, wherein the total amount of the impurities in the magnesium-lithium alloy material is less than 0.1 wt.%. The processing procedure comprises vacuum melting to prepare an ingot, homogenization annealing, upsetting-extruding pre-deformation, blank straightening and cutting, multi-pass upsetting-drawing forming, low-temperature aging treatment, and mechanical processing of the rod. The application adopts a method combining multiple plastic deformations for the (alpha+beta) dual-phase magnesium-lithium alloy, promotes grain organization refinement and uniform distribution of strengthening phases, significantly improves the organization uniformity and mechanical properties, and finally prepares the high-toughness (alpha+beta) dual-phase magnesium-lithium alloy rod, with a rod diameter of greater than or equal to 200 mm, a room-temperature tensile strength of greater than or equal to 330 Mpa, and an elongation of greater than or equal to 10%.