Evaporation-condensation method for preparing superfine metal powder

Abstract

The invention discloses an evaporation-condensation method for preparing superfine metal powder, which comprises the steps that raw materials are fed into a crucible of an evaporator through an airtight metal feeding machine, and the feed speed is 0-10kilogram / hour; metal is evaporated in the evaporator; air containing metal steam is injected into a condensation pipe with the speed of 500-25,000lpm, steam in the condensation pipe is quickly cooled by the condensation pipe through water cooling to form metal powder, the metal powder enters a collector along with the air, and the powder is separated from the air through a set of multi-pore metal filter core device to form pressed powder; and inert gas is reversely blown in to enable the pressed powder to fall and be collected. The superfine powder prepared with the method is good in particle quality, the superfine powder is spherical particles with the particle diameter as 50-2,000 nanometers, and the superfine powder is good in particle size distribution. The method has the advantages of being capable of meeting industrialized scale productivity, low in production cost, small in invest, simple in equipment, easy to control particle size, capable of preparing various types of metal superfine powder, wide in using scope and the like.

Description

technical field [0001] The invention relates to a method for preparing superfine metal powder by evaporation-condensation. Background technique [0002] In the 1960s, someone proposed the concept of ultrafine powder. The particle size of ultrafine powder is generally required to be 0.1~1 micron, and ultrafine powder is also called nanoparticle. By the early 1980s, Japanese scientists began to conduct in-depth research on ultrafine powder, including its characteristics, uses, and manufacturing methods. Due to the efforts of Japanese scientists, the concept of ultrafine powder was finally accepted by people, and it caused scholars and experts from other European and American developed countries, such as the United States, Britain, Germany, France and other countries, to attach great importance to the research of ultrafine powder, resulting in an upsurge . A brand-new science and technology-nanotechnology was born from the research of ultrafine powder. The technology that p...

AI Technical Summary

Problems solved by technology

However, most mechanical methods have the problem of difficult classification after powder preparation; gas atomization method is currently the main method for preparing high-performance metal and alloy powders, but the production efficiency is low, the yield of ultrafine powder is not high, and the energy consumption is relatively low. Larger, high production cost; Jet milling method and hydrodehydrogenation method are suitable for large-scale industrial production, but have strong selectivity to raw material metals and alloys; chemical reaction method, containing impurities such as halogen, sulfur, oxygen, carbon, particle size distribution Wide, poor wettability, low surface activity

Moreover, the existing international market generally requires metal powders with a particle size of 0.3 to 5 microns, while most of the metal fine powders prepared by the prior art have a particle size of more than 10 microns, which is far from meeting the market demand.