Method and device for preparing metal powder

Abstract

The invention relates to a method for preparing metal powder, which comprises the following steps that: a master alloy to be prepared is melted; the metal liquid is heated to a certain temperature, poured into a ladle, and injected into a pouring box through a water gap, the outlet end of the pouring box is provided with a film prefabricating guide groove for controlling the molten steel to a certain width, the far end on the top surface of the guide groove is provided with an opening and a high-temperature roller rotating at a high speed, the roller maintains a certain distance from the bottom of the film prefabricating guide groove, and the metal liquid is formed into a film by the roller and the film prefabricating guide groove; the roller rotates at a high speed, and throws away the molten metal attached on the surface when passing through the molten steel film so as to form molten drops; and a gas nozzle for jetting a cooling medium is arranged above the molten drops, and the molten drops are jetted and cooled by the cooling medium in the process of movement and are solidified at a very quick speed to form metal particles falling into a holding tank so as to form the metal powder.

Description

technical field [0001] The invention relates to powder metallurgy technology, in particular to a method and device for preparing metal powder. Background technique [0002] The method of atomizing metal liquid to form metal powder is one of the commonly used methods in powder metallurgy. For example, water atomization and gas atomization are two methods that use water or gas as a medium to impact metal liquid at high speed to prepare metal powder. In the case of water atomization, the particles are irregularly shaped and come in many different sizes; gas atomization generally forms spherical particles. The method of applying centrifugal force to separate the metal stream is called centrifugal atomization. Centrifugal atomization needs to contact the molten metal with the rotating disk. The molten metal is mechanically atomized, thrown from the edge of the rotating disk, and falls into the cooling medium to solidify to form particles. Particles are generally spherical in s...

AI Technical Summary

Problems solved by technology

[0005] Since the position where the metal liquid flow falls from the catheter to the centrifugal disk is difficult to align with the center of the disk, the mass density of the sprayed mist flow along the circumferential direction after the liquid flow is atomized from the high-speed rotating disk cannot be kept uniform, resulting in the spraying of droplets. Large difference in diameter

[0006] The cooling gas medium needs to be arranged in a large range in the circumference. Since the molten steel atomized by the centrifugal disk is splashed around the rotating disk, it is necessary to arrange a large number of gas medium cooling pipes in the circumferential direction inside the equipment, which makes the equipment more complicated. Increase

Images